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AutoCAD ® 2002

DXF Reference Guide

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1 2 3 4 5 6 7 8 9 10

Copyright © 2001 Autodesk, Inc.All Right s Reserved

AUTODESK, INC. M AKES NO WARRANTY, EITHER EXPRESSED OR IMPLIED, INCLUDING BUT NOT LIMITED TO ANYIM PLIED WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, REGARDING THESE MATERIALSAND MAKES SUCH MATERIALS AVAILABLE SOLELY ON AN “AS-IS” BASIS.

IN NO EVENT SHALL AUTODESK, INC. BE LIABLE TO ANYONE FOR SPECIAL, COLLATERAL, INCIDENTAL, OR

CONSEQUENTIAL DAMAGES IN CONNECTION WITH OR ARISING OUT OF PURCHASE OR USE OF THESE MATERIALS. THESOLE AND EXCLUSIVE LIABILITY TO AUTODESK, INC., REGARDLESS OF THE FORM OF ACTION, SHALL NOT EXCEED THEPURCHASE PRICE OF THE MATERIALS DESCRIBED HEREIN.

Autodesk, Inc. reserves the right to revise and improve its products as it sees fit . This publication describes the state of this productat the time of its publication, and may not reflect the product at all times in the future.

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Third Party Trademarks

All other brand nam es, product nam es or trademarks belong to th eir respecti ve holders.

Third Party Software Program Credits

ACIS Copyright © 1989-2001 Spatial Corp.

Copyright © 1997 M icrosoft Corpo rat ion. All rights reserved.

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GOVERNMENT USE

Use, dup licat ion, o r disclosure by the U. S. Governm ent is subject t o restr ictions as set fort h in FAR 12 .212 (Com mercial Comp uterSoftware-Rest ricted Righ ts) and DFAR 227 .72 02 (Righ ts in Technical Data and Com put er Soft ware), as appl icable.

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iii

Contents

Revisions to the DXF Reference . . . . . . . . . . . 1

Objects Section . . . . . . . . . . . . . . . . . . . 2

Chapter 1 DXF Format . . . . . . . . . . . . . . . . . 5

Organ ization of This Referen ce . . . . . . . . . . . . . . 6

Form attin g Con ven tion s in This Reference . . . . . . . . . 6

Object an d En tity Cod es . . . . . . . . . . . . . . . . 6Group Code Value Types . . . . . . . . . . . . . . . . 7

Group Codes in Nu m erical Order . . . . . . . . . . . . . 9

Chapter 2 HEADER Section . . . . . . . . . . . . . . . . 15

HEADER Section Grou p Cod es . . . . . . . . . . . . . 16

Revised VPORT Header Variab les . . . . . . . . . . . 27

Special Han dlin g of Date/ Tim e Variables . . . . . . . . 28

Chapter 3 CLASSES Section . . . . . . . . . . . . . . . . 31

CLASSES Sectio n Grou p Cod es . . . . . . . . . . . . . 32Defaul t Class Values . . . . . . . . . . . . . . . 33

Chapter 4 TABLES Section . . . . . . . . . . . . . . . . 35

Sym bol Table Grou p Cod es . . . . . . . . . . . . . . 36

Com m on Sym bo l Table Group Cod es . . . . . . . . . . . 36

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iv | Contents

Com m on Group Codes for Sym bo l Table En tries. . . . . . 37

APPID . . . . . . . . . . . . . . . . . . . . . 38

BLOCK_RECORD . . . . . . . . . . . . . . . . . . 39

DIMSTYLE . . . . . . . . . . . . . . . . . . . . 40

LAYER . . . . . . . . . . . . . . . . . . . . . 44

LTYPE . . . . . . . . . . . . . . . . . . . . . 45

STYLE . . . . . . . . . . . . . . . . . . . . . 46UCS . . . . . . . . . . . . . . . . . . . . . . 47

VIEW . . . . . . . . . . . . . . . . . . . . . 49

VPORT . . . . . . . . . . . . . . . . . . . . . 51

Chapter 5 BLOCKS Section . . . . . . . . . . . . . . . . 55

BLOCKS Section Grou p Codes . . . . . . . . . . . . . 56

BLOCK . . . . . . . . . . . . . . . . . . . . . 56

ENDBLK . . . . . . . . . . . . . . . . . . . . 58

Chapter 6 ENTITIES Section . . . . . . . . . . . . . . . . 59

Com m on Group Codes for En tities . . . . . . . . . . . . 60

3DFACE . . . . . . . . . . . . . . . . . . . . 62

3DSOLID . . . . . . . . . . . . . . . . . . . . 63

ACAD_PROXY_ENTITY. . . . . . . . . . . . . . . . 63

ARC . . . . . . . . . . . . . . . . . . . . . . 64

ATTDEF. . . . . . . . . . . . . . . . . . . . . 65

ATTRIB . . . . . . . . . . . . . . . . . . . . . 66

BODY . . . . . . . . . . . . . . . . . . . . . 68

CIRCLE . . . . . . . . . . . . . . . . . . . . . 69

DIMENSION . . . . . . . . . . . . . . . . . . . 69Com m on Dimen sion Group Codes . . . . . . . . . . 69

Align ed Dim en sion Group Cod es. . . . . . . . . . . 71

Linear an d Rotated Dimen sion Group Cod es . . . . . . . 72

Radial an d Diam eter Dim ension Group Codes . . . . . . 73

An gular Dimen sion Group Cod es. . . . . . . . . . . 74

Ordinate Dimen sion Group Codes . . . . . . . . . . 75

Dim en sion Style Overrides . . . . . . . . . . . . . 76

ELLIPSE . . . . . . . . . . . . . . . . . . . . . 76

ELLIPSE Com m an d’s Param eter Op tion . . . . . . . . . 77

HATCH . . . . . . . . . . . . . . . . . . . . . 78

Boun dary Path Data . . . . . . . . . . . . . . . 80Patt ern Data . . . . . . . . . . . . . . . . . 83

IMAGE . . . . . . . . . . . . . . . . . . . . . 83

INSERT . . . . . . . . . . . . . . . . . . . . . 85

LEADER. . . . . . . . . . . . . . . . . . . . . 86

LINE. . . . . . . . . . . . . . . . . . . . . . 88

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Contents | v

LWPO LYLINE . . . . . . . . . . . . . . . . . . . 88

MLINE. . . . . . . . . . . . . . . . . . . . . . 89

MTEXT . . . . . . . . . . . . . . . . . . . . . 92

OLEFRAME . . . . . . . . . . . . . . . . . . . . 93

OLE2FRAME . . . . . . . . . . . . . . . . . . . . 94

POINT. . . . . . . . . . . . . . . . . . . . . . 96

POLYLINE . . . . . . . . . . . . . . . . . . . . 97Polyface Mesh es . . . . . . . . . . . . . . . . . 98

RAY . . . . . . . . . . . . . . . . . . . . . . 99

REGION . . . . . . . . . . . . . . . . . . . . . 99

SEQEND . . . . . . . . . . . . . . . . . . . . 100

SHAPE. . . . . . . . . . . . . . . . . . . . . 100

SOLID . . . . . . . . . . . . . . . . . . . . . 101

SPLINE . . . . . . . . . . . . . . . . . . . . 102

TEXT . . . . . . . . . . . . . . . . . . . . . 103

TOLERANCE. . . . . . . . . . . . . . . . . . . 105

TRACE. . . . . . . . . . . . . . . . . . . . . 106

VERTEX . . . . . . . . . . . . . . . . . . . . 107VIEWPORT . . . . . . . . . . . . . . . . . . . 109

XLINE . . . . . . . . . . . . . . . . . . . . . 113

Chapter 7 OBJECTS Section . . . . . . . . . . . . . . . 115

OBJECT Section Grou p Cod es . . . . . . . . . . . . . 116

Object Own ersh ip . . . . . . . . . . . . . . . 116

Com m on Group Codes for Objects . . . . . . . . . . . 116

ACAD_PROXY_OBJECT . . . . . . . . . . . . . . . 117

ACDBDICTION ARYWDFLT . . . . . . . . . . . . . . 118

ACDBPLACEHOLDER . . . . . . . . . . . . . . . . 119DICTIONARY . . . . . . . . . . . . . . . . . . 120

DICTION ARYVAR . . . . . . . . . . . . . . . . . 121

DIMASSOC . . . . . . . . . . . . . . . . . . . 122

GROUP . . . . . . . . . . . . . . . . . . . . 124

IDBUFFER . . . . . . . . . . . . . . . . . . . 125

IMAGEDEF . . . . . . . . . . . . . . . . . . . 125

IMAGEDEF_REACTOR. . . . . . . . . . . . . . . . 126

LAYER_INDEX . . . . . . . . . . . . . . . . . . 127

LAYER_FILTER . . . . . . . . . . . . . . . . . . 128

LAYOUT . . . . . . . . . . . . . . . . . . . . 128

MLINESTYLE. . . . . . . . . . . . . . . . . . . 131OBJECT_PTR. . . . . . . . . . . . . . . . . . . 132

PLOTSETTINGS . . . . . . . . . . . . . . . . . . 133

RASTERVARIABLES. . . . . . . . . . . . . . . . . 135

SPATIAL_INDEX . . . . . . . . . . . . . . . . . 136

SPATIAL_FILTER . . . . . . . . . . . . . . . . . 137

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vi | Contents

SORTENTSTABLE. . . . . . . . . . . . . . . . . . 138

VBA_PROJECT . . . . . . . . . . . . . . . . . . 139

XRECORD . . . . . . . . . . . . . . . . . . . . 140

Chapter 8 THUMBNAILIMAGE Section . . . . . . . . . . . 143

THUMBNAILIMAGE Sect ion Gro up Co des. . . . . . . . . . 144

Appendix A Drawing Interchange File Formats . . . . . . . . 145

ASCII DXF Files . . . . . . . . . . . . . . . . . . 146

Gen eral DXF File Stru cture . . . . . . . . . . . . . 146

Grou p Codes in DXF Files . . . . . . . . . . . . . 147

ASCII Con trol Ch aract ers in DXF Files . . . . . . . 147

Header Grou p Cod es in DXF Files . . . . . . . . . . 148

Class Group Codes in DXF Files . . . . . . . . . . . 148

Sym bol Table Grou p Cod es in DXF Files . . . . . . . . 149

Sym bol Table Exam ple . . . . . . . . . . . . 149Blocks Grou p Cod es in DXF Files . . . . . . . . . . . 152

En tity Grou p Cod es in DXF Files . . . . . . . . . . . 153

Object Grou p Cod es in DXF Files. . . . . . . . . . . 153

Writing a DXF Interface Program . . . . . . . . . . . 154

Read ing a DXF File . . . . . . . . . . . . . 154

Writin g a DXF File . . . . . . . . . . . . . 156

Bin ary DXF Files . . . . . . . . . . . . . . . . . . 158

Slide Files . . . . . . . . . . . . . . . . . . . . 159

Old Slide Header . . . . . . . . . . . . . . . . 162

Slide Library Files. . . . . . . . . . . . . . . . . . 163

Appendix B Advanced DXF Issues . . . . . . . . . . . . 165

Databa se Objects . . . . . . . . . . . . . . . . . . 166

Persistent Int er-Object Reference Han dles . . . . . . . . . . 166

Poin ter an d Own ership Referen ces . . . . . . . . . . 167

Hard an d Soft Referen ces . . . . . . . . . . . . . 167

Arbitrary Han dles . . . . . . . . . . . . . . . . 167

1005 Group Cod es . . . . . . . . . . . . . . . 168

Subclass Marker s . . . . . . . . . . . . . . . . . . 168

Exten sion Dictionary an d Persistent Reactors . . . . . . . . . 170

Exten ded Data . . . . . . . . . . . . . . . . . . 170Object Coo rdin ate System s (OCS) . . . . . . . . . . . . 173

Arbitrary Axis Algorith m . . . . . . . . . . . . . . . 175

Index . . . . . . . . . . . . . . . . . . 177

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Revisions to the DXF

Reference

Th is topic lists th e revision s to t h e DXF Reference from

th e last up da te to th e DXF Reference. Th e version n um -

ber of th is DXF Referen ce is u 16.1.01. An y up dat es t o

th is referen ce will be available at http://

www.autodesk.com /techpubs/autocad/dxf / .

In this chapter

s Objects Section

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2 | Revisions to the DXF Reference

Objects Section

s New objects: DIMASSOC.

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Objects Section | 3

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4

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DX F Format

Th e DXF™ form at is a t agged d ata represen tation of all

th e in form ation con tained in an Aut oCAD® drawing

file. Tagged data m eans tha t each da ta elem ent in th e file

is preceded b y an integer nu m ber that i s called a group

code. A grou p code’s value ind icates wh at typ e of data

elem en t follows. This value also in dicates th e m eanin g

of a data elem ent for a given object (or record) type.

Virtually all user-specified in format ion in a d rawin g file

can be rep resen ted in DXF form at.

In this chapter

s Or ganization of This Refere

s Object and Entity Codes

s Group Code Value Types

s Group Codes in NumericalOrder

1

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6 | Chapter 1 DXF Format

Organization of This Reference

Th e DXF Reference present s the DXF™ grou p codes foun d in DXF files an d

encou n tered b y Aut oLISP® and ObjectARX™ applications. This chapter

describes the general DXF con ventio ns. Th e rem ain in g ch apt ers list th e

grou p codes organized by ob ject type. Th e group codes are present ed in th eorder th ey are found in a DXF file, an d each ch apter is n am ed accordin g to

th e associated section of a DXF file. Alth ou gh th e DXF file form at is used as

the organizin g m ech anism for t h is referen ce, specific information on th e

actual form attin g of DXF files is fou n d in app en dix A, “Drawing Interchange

File Formats.” Advan ced co n cept s relating to DXF group codes as th ey per-

tain t o both app lication s and DXF files is foun d in app en dix B, “Advanced

DXF Issues.”

For descriptions of th e Aut oLISP funct ion s tha t use group codes, see cha pter

10, “Using AutoLISP to Manipulate AutoCAD Objects,” in the Visual LISP

Developer’s Guide.

Formatting Conventions in This Reference

Each grou p code listed in th is referen ce is presen ted by a nu m eric grou p code

value and a descript ion . All group codes can app ly to DXF™ files, applica-

tions (AutoLISP or ObjectARX), or both. When the description of a code is

differen t for app lication s and DXF files (or on ly applies to on e or th e oth er),

th e description is preceded by t h e followin g in dicators:

APP App lication -specific descriptio n

DXF DXF file-specific descrip tion

If th e descript ion is com m on to bot h DXF files and ap plication s, no in dicator

is provided.

Optional codes are indicated as “optional” in the description.

Object and Entity Codes

In th e DXF™ format , th e defin ition of objects differs from en tities: objects

h ave no graph ical representation an d en tities do. For examp le, diction ariesare objects not entities. Entities are also referred to as graphical objects while

objects are referred to as nongraphical objects.

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Group Code Value Types | 7

En tities app ear in b oth th e BLOCK and ENTITIES section s of th e DXF file.

Th e use of group co des in th e two section s is iden tical.

Some group codes that define an entity always appear; others are optional

an d app ear only if th eir values differ from th e defaults.

Do no t write programs th at rely on th e order given here. Th e end o f an ent ity

is in dicated by th e n ext 0 group, which begins the n ext entity or indicatesthe en d of th e section.

NOT E Accommodating DXF files from future releases of AutoCAD® will be eas-

ier if you wr ite your DXF processing program in a table-driven way, ignore unde-

fined group codes, and make no assumptions about the order of group codes in

an entity. With each new AutoCAD release, new group codes will be added to

entit ies to accommodate additional features.

Group Code Value Types

Group codes define th e type of the a ssociated value as an int eger, a float in g-

poin t nu m ber, or a string, accordin g to the following table of grou p code

ranges. For information about ab breviations and form atting u sed in t h is

table, see “Form att ing Con ven tion s in Th is Referen ce” on page 6.

Group code value types

Code range Group value type

0–9 St ring (wit h th e int roduct ion of ext end ed sym bol names inAutoCAD 2000, the 255 character limit has been lifted.There is no explicit limit to the number of bytes per line,although most lines should fall within 2049 bytes)

10–39 Double precision 3D point

40–59 Double precision float ing point value

60–79 16-bit integer value


100 St ring (255-character max imum; less for Un icode strings)

102 St ring (255-character max imum; less for Un icode strings)

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105 St ring rep resent ing hexadecimal (hex) han dle value




140–149 Double precision scalar float ing-point value





290–299 Boolean flag value

300–309 Arbitrary text string

310–319 String represent ing hex value of binary chunk

320–329 String represent ing hex handle value

330–369 St ring rep resent ing hex ob ject IDs



390–399 String represent ing hex handle value


410–419 String

999 Comment (string)

1000–1009 String (same limits as indicated with 0–9 code range)

1010–1059 Double precision floating point value

1060–1070 16-b it integer value

Group code value types (continued )


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Group Codes in Numerical Order | 9

Group Codes in Numerical Order

Th e followin g table gives th e grou p code or group cod e range accom pan ied

by an explanation of th e group code value. In th e table, “fixed” in dicates that

th e group code always h as the sam e pu rpose. If a grou p code isn’t fixed, its

purpose depends on the con text. For information about abbreviations an d

formatt ing used in t his table, see “Form attin g Con ven tion s in Th is Refer-

ence” on p age 6.

1071 32-bit integer value

Group codes by number

Group code Description

–5 APP: persistent reactor chain

–4 APP: condit ional operator (used only with s s g e t )

–3 APP: extended dat a (XDATA) sentinel (fixed)

–2 APP: ent ity name reference (fixed)

–1 APP: entity name. The name changes each time a drawing is opened. It

is never saved (f ixed)

0 Text string indicating the entity type (fixed)

1 Primary text value for an entity

2 Name (attribute tag, block name, and so on)

3–4 Other text or name values

5 Ent it y h andle; text string of up t o 16 h exad ecimal digit s (fixed )

6 Linetype name (fixed)

7 Text style name (fixed)

8 Layer name (fixed)

Group code value types (continued )


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9 DXF: var iable name identifier (used only in HEADER sect ion of the DXFfile)

10 Primary point ; th is is the start po in t of a line or text ent ity, center of acircle, and so onDXF: X value of the primary point (followed by Y and Z value codes 20and 30)APP: 3D point (list of three reals)

11–18 Other pointsDXF: X value of other point s (followed by Y value codes 21–28 and Z value codes 31–38)APP: 3D point (list of three reals)

20, 30 DXF™: Y and Z values of the primary point

21–28, 31–37 DXF: Y and Z values of other points

38 DXF: entity’s elevation if nonzero

39 Ent ity’s thickness if nonzero (fixed)

40–48 Double precision floating point values (text height, scale factors, andso on)

48 Linetype scale; double precision float ing point scalar value; defaultvalue is defined for all entity types

49 Repeated double precision float ing point value. Mult ip le 49 g roups

may appear in one entity for variable-length tables (such as the dashlengths in the LTYPE table). A 7x group always appearsbefore the first49 group to specify the table length

50–58 Angles (output in degrees to DXF files and radians through AutoLISPand ObjectARX applications)

60 Ent ity visib ility; in teger value; absence or 0 ind icates visib ility;1 indicates invisibility

62 Color number (fixed)

66 “ Ent it ies follow” flag (fixed)

67 Space—that is, model or paper space (fixed)

Group codes by number (continued )


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68 APP: identifies whether viewpor t is on but fully off screen; is not activeor is off

69 APP: viewport ident ification number

70–78 Integer values, such as repeat counts, f lag bits, or modes

90–99 32-bit integer values

100 Subclass data marker (with derived class name as a string). Required forall objects and entity classes that are derived from another concreteclass. The subclass data marker segregates data defined by differentclasses in the inheritance chain for the same object.This is in addition t o the requirement for DXF names for each distinctconcrete class derived from ObjectARX (see “ Subclass Markers” onpage 168)

102 Cont rol st ring , followed by “ {<arbit rary name>” or “ } ” . Similar to thexdata 1002 group code, except t hat when the string begins with “ {“ , itcan be followed by an arbitrary string whose interpretation is up to theapplication. The only other cont rol string allowed is “ }” as a groupterminator. AutoCAD does not interpret these strings except duringdrawing audit operations. They are for application use

105 Object handle for DIM VAR sym bol table entry

110 UCS origin (appears only if code 72 is set to 1)DXF: X value; APP: 3D point

111 UCS X -axis (appears only if code 72 is set to 1)DXF: X value; APP: 3D vector

112 UCS Y -axis (appears only if code 72 is set t o 1)DXF: X value; APP: 3D vector

120–122 DXF: Y value of UCS origin, UCS X -axis, and UCSY -axis

130–132 DXF: Z value of UCS orig in, UCS X -axis, and UCS Y -axis

140–149 Double precision floating point values (points, elevation, andDIM STYLE sett ings, for example)

170–179 16-bit integer values, such as flag bits representing DIMSTYLE settings

210 Extrusion direct ion (fixed)DXF: X value of extrusion directionAPP: 3D extrusion d irection vector



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220, 230 DXF: Y and Z values of the extrusion direct ion



290–299 Boolean flag value

300–309 Arbit rary text strings

310–319 Arbitrary binary chunks with same representation and limits as 1004group codes: hexadecimal strings of up to 254 characters representdata chunks of up to 127 bytes

320–329 Arbitrary object handles; handle values that are taken “ as is.” They arenot t ranslated during INSERT and XREF operations

330–339 Soft-pointer handle; arbitrary soft pointers to other objects within sameDXF file or drawing. Translated during INSERT and XREF operations

340–349 Hard-pointer handle; arbitrary hard pointers to other objects withinsame DXF file or drawing. Translated during INSERT and XREFoperations

350–359 Soft-owner handle; arbitrary soft ownership links to other objectswithin same DXF file or drawing. Translated during INSERT and XREFoperations

360–369 Hard-owner handle; arbitrary hard ownership links to other objects

within same DXF file or drawing. Translated during INSERT and XREFoperations

370–379 Lineweight enum value (AcDb::LineWeight). Stored and moved aroundas a 16-bit integer. Custom non-entity objects may use the full range,but entity classes only use 371–379 DXF group codes in theirrepresentation , because AutoCAD® and AutoLISP both always assume a370 group code is the entity’s lineweight. This allows 370 to behavelike other “ common” entity fields

380–389 PlotStyleName type enum (AcDb::PlotStyleNameType). Stored andmoved around as a 16-bit integer. Custom non-entity objects may usethe full range, but entity classes only use 381–389 DXF group codes in

their representation, for the same reason as the Lineweight rangeabove



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390–399 String representing handle value of the PlotStyleName object, basicallya hard pointer, but has a different range to make backwardcompatibility easier to deal with. Stored and moved around as an

Object ID (a handle in DXF files) and a special type in AutoLISP.Custom non-entity objects may use the full range, but entity classesonly use 391–399 DXF group codes in t heir representation, for thesame reason as the Lineweight range above

400–409 16-bit Integers

410–419 String

999 DXF: The 999 group code ind icates that the line following it is acomment string. SAVEAS does not include such groups in a DXF outputfile, but OPEN honors them and ignores the comm ents. You can usethe 999 g roup to include comments in a DXF file that you’ve edited

1000 ASCII st ring (up to 255 bytes long) in ex tended data

1001 Registered applicat ion name (ASCII string up to 31 bytes long) forextended data

1002 Extended data control string (“ { ” or “ } ” )

1003 Extended data layer name

1004 Chunk of b ytes (up to 12 7 b ytes lon g) in ext ended data

1005 Ent ity handle in extended data; text st ring of up to 16 hexadecimal

digits

1010 A point in extended dataDXF: X value (followed by 1020 and 1030 groups)APP: 3D point

1020, 1030 DXF: Y and Z values of a point

1011 A 3D world space position in ext ended dat aDXF: X value (followed by 1021 and 1031 g roups)APP: 3D point

1021, 1031 DXF: Y and Z values of a world space position

1012 A 3D world space displacement in ex tended d ataDXF: X value (followed by 1022 and 1032 g roups)APP: 3D vector



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1022, 1032 DXF: Y and Z values of a world space displacement

1013 A 3D world space direction in ext ended dat a

DXF: X value (followed by 1022 and 1032 g roups)APP: 3D vector

1023, 1033 DXF: Y and Z values of a world space direction

1040 Extended data doub le p recision floating point value

1041 Extended data distance value

1042 Extended data scale factor

1070 Extended data 16-bit signed integer

1071 Extended data 32-bit signed long



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1

HEADER Section

Th e group codes d escribed in th is ch apt er pertain

on ly to DXF™ files. Th e HEADER section of a DXF file

cont ains th e settin gs of variables associated with th e

drawing. Each variable is specified by a 9 grou p code

giving th e variable’s n am e, followed by group s that

supply t h e variable’s value. Th is ch apter lists on ly th e

variables tha t are saved in th e drawin g file.

In this chapter

s HEADER Section Group Co

2

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16 | Chapter 2 HEADER Section

HEADER Section Group Codes

Th e following tab le lists th e variables th at are saved in a D XF™ file. For in for-

m ation about ab breviations and form atting used in t h is table, see “Format-

ting Con ven tion s in Th is Referen ce” on page 6.

DX F system variables

Variable Group code Description

$ACADM AIN TVER 70 M aintenance version n umb er (should b e ignored)

$ACADVER 1 The AutoCAD® drawing database version number:AC1006 = R10, AC1009 = R11 and R12,AC1012 = R13, AC1014 = R14, AC1015 = AutoCAD 2000

$ANGBASE 50 Angle 0 direction

$ANGDIR 70 1 = Clockwise angles, 0 = Counterclockwise

$ATTMODE 70 Attribute visibility: 0 = None, 1 = Normal, 2 = All

$AUNITS 70 Units format for angles

$AUPREC 70 Units precision for angles

$CECOLOR 62 Current ent ity color number:0 = BYBLOCK, 256 = BYLAYER

$CELTSCALE 40 Current ent ity linetype scale

$CELTYPE 6 Ent ity linetype name, or BYBLOCK or BYLAYER

$CELWEIGHT 370 Lineweig ht of new ob jects

$CPSNID 390 Plotstyle handle of new objects. If CEPSNTYPE is 3, then this valueindicates the handle

$CEPSNTYPE 380 Plotstyle type of new ob jects:0 = PlotStyle by layer1 = PlotStyle by block2 = PlotStyle by dictionary default3 = PlotStyle by object ID/handle

$CHAMFERA 40 First chamfer distance

$CHAMFERB 40 Second chamfer distance

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HEADER Section Group Codes | 17

$CHAMFERC 40 Chamfer length

$CHAMFERD 40 Chamfer angle

$CLAYER 8 Current layer name

$CMLJUST 70 Current multiline just ification:0 = Top, 1 = Middle, 2 = Bottom

$CMLSCALE 40 Current multiline scale

$CMLSTYLE 2 Current multiline style name

$DIMADEC 70 Number of precision places displayed in angular dimensions

$DIMALT 70 Alternate unit dimensioning performed if nonzero

$DIMALTD 70 Alternate unit decimal places

$DIMALTF 40 Alternate unit scale factor

$DIMALTRND 40 Determines rounding o f alternate units

$DIM ALTTD 70 Number of decimal places for t olerance values of an alternat e unitsdimension

$DIM ALTTZ 70 Cont rols suppression of zeros for alternat e tolerance values:0 = Suppresses zero feet and precisely zero inches

1 = Includes zero feet and precisely zero inches2 = Includes zero feet and suppresses zero inches3 = Includes zero inches and suppresses zero feet

$DIMALTU 70 Units format for alternate units of all dimension style familymembers except angular:1 = Scienti fic; 2 = Decimal; 3 = Engineering ;4 = Architectural (stacked); 5 = Fractional (stacked);6 = Architectural; 7 = Fractional

$DIM ALTZ 70 Controls suppression of zeros for alternat e unit dim ension values:0 = Suppresses zero feet and precisely zero inches1 = Includes zero feet and precisely zero inches2 = Includes zero feet and suppresses zero inches

3 = Includes zero inches and suppresses zero feet

$DIMAPOST 1 Alternate dimensioning suffix

DX F system variables (continued )


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$DIMASO 70 1 = Create associat ive dimensioning0 = Draw individual entities

$DIMASZ 40 Dimensioning arrow size

$DIMATFIT 70 Controls dimension text and arrow placement when space is notsufficient to place both within the extension lines:0 = Places both text and arrows outside extension lines1 = Moves arrows first, then text2 = M oves text first, t hen arrows3 = M oves either t ext or arrows, wh ichever fit s bestAutoCAD adds a leader to moved dimension text whenDIMTMOVE is set to 1

$DIMAUNIT 70 Angle format for angular dimensions:0 = Decimal degrees, 1 = Degrees/minutes/ seconds,

2 = Gradians, 3 = Radians, 4 = Surveyor’s units

$DIMAZIN 70 Controls suppression of zeros for angular dimensions:0 = Displays all leading and trailing zeros1 = Suppresses leading zeros in decimal dimensions2 = Suppresses trailing zeros in decimal dimensions3 = Suppresses leading and trailing zeros

$DIMBLK 1 Arrow block name

$DIMBLK1 1 First arrow block name

$DIMBLK2 1 Second arrow block name

$DIMCEN 40 Size of center mark/ lines

$DIMCLRD 70 Dimension line color:range is 0 = BYBLOCK, 256 = BYLAYER

$DIMCLRE 70 Dimension extension line color:range is 0 = BYBLOCK, 256 = BYLAYER

$DIMCLRT 70 Dimension text color:range is 0 = BYBLOCK, 256 = BYLAYER

$DIMDEC 70 Number of decimal places for the tolerance values of a primary

units dimension

$DIMDLE 40 Dimension line extension

$DIMDLI 40 Dimension line increment



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$DIMDSEP 70 Single-character decimal separator used when creating dimensionswhose unit format is decimal

$DIMEXE 40 Extension line extension

$DIMEXO 40 Extension line offset

$DIMFAC 40 Scale factor used to calculate the height of text for dimensionfractions and tolerances. AutoCAD multiplies DIMTXT by DIMTFACto set the fractional or tolerance text height

$DIMGAP 40 Dimension line gap

$DIM JUST 70 Horizont al d imensio n text posit ion:0 = Above dimension line and center-justified between extensionlines

1 = Above dimension line and next to first extension line2 = Above dimension line and next to second extension line3 = Above and center-justified to first extension line4 = Above and center-justif ied to second extension line

$DIM LDRBLK 1 Arrow block name for leaders

$DIMLFAC 40 Linear measurements scale factor

$DIMLIM 70 Dimension limits generated if nonzero

$DIMLUNIT 70 Sets uni ts for al l dimension types except Angular:1 = Scienti fic; 2 = Decimal; 3 = Engineering ;

4 = Architectural; 5 = Fractional; 6 = Windows desktop

$DIMLWD 70 Dimension line lineweight: –3 = Standard –2 = ByLayer –1 = ByBlock0–211 = an integer representing 100th of mm

$DIMLWE 70 Extension line lineweight: –3 = Standard –2 = ByLayer –1 = ByBlock0–211 = an integer representing 100th of mm

$DIMPOST 1 General dimensioning suffix

$DIMRND 40 Rounding value for dimension distances

$DIMSAH 70 Use separate arrow blocks if nonzero



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$DIMSCALE 40 Overall dimensioning scale factor

$DIMSD1 70 Suppression of first extension line:

0 = N ot suppressed, 1 = Suppressed

$DIMSD2 70 Suppression of second extension line:0 = N ot suppressed, 1 = Suppressed

$DIMSE1 70 First extension line suppressed if nonzero

$DIMSE2 70 Second extension line suppressed if nonzero

$DIMSHO 70 1 = Recompute dimensions while dragging0 = Drag original image

$DIMSOXD 70 Suppress outside-extensions dimension lines if nonzero

$DIMSTYLE 2 Dimension style name

$DIMTAD 70 Text above dimension line if nonzero

$DIMTDEC 70 Number of decimal places to display the tolerance values

$DIMTFAC 40 Dimension tolerance display scale factor

$DIMTIH 70 Text inside horizontal if nonzero

$DIMTIX 70 Force text inside extensions if nonzero

$DIMTM 40 Minus tolerance

$DIM TM OVE 70 Dim ension t ext m ovement rules:0 = Moves the dimension line with dimension text1 = Adds a leader when dimension t ext is moved2 = Allows text to be moved freely without a leader

$DIMTOFL 70 If text is outside extensions, force line extensions betweenextensions if nonzero

$DIMTOH 70 Text outside horizontal if nonzero

$DIMTOL 70 Dimension tolerances generated if nonzero

$DIMTOLJ 70 Vert ical justification for tolerance values:0 = Top, 1 = Middle, 2 = Bottom



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$DIMTP 40 Plus tolerance

$DIMTSZ 40 Dimensioning t ick size:

0 = No ticks

$DIMTVP 40 Text vertical position

$DIMTXSTY 7 Dimension text style

$DIMTXT 40 Dimensioning text height

$DIMTZIN 70 Controls suppression of zeros for tolerance values:0 = Suppresses zero feet and precisely zero inches1 = Includes zero feet and precisely zero inches2 = Includes zero feet and suppresses zero inches3 = Includes zero inches and suppresses zero feet

$DIMUPT 70 Cursor funct ionality for user positioned text:0 = Controls only the dimension line location1 = Controls the text position as well as the dimension line location

$DIMZIN 70 Controls suppression of zeros for primary unit values:0 = Suppresses zero feet and precisely zero inches1 = Includes zero feet and precisely zero inches2 = Includes zero feet and suppresses zero inches3 = Includes zero inches and suppresses zero feet

$DISPSILH 70 Controls the display of silhouet te curves of body objects in Wire-frame mode:

0 = Off, 1 = On

$DWGCODEPAGE 3 Draw ing code p age; Set to t he syst em cod e pag e w hen a newdrawing is created, but not otherwise maintained by AutoCAD

$ELEVATION 40 Current elevation set by ELEV command

$ENDCAPS 280 Lineweight endcaps sett ing for new objects:0 = none; 1 = round; 2=angle; 3=square

$EXTMAX 10, 20, 30 X , Y , and Z drawing extents upper-right corner (in WCS)

$EXTMIN 10, 20, 30 X , Y , and Z drawing extents lower-left corner (in WCS)



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$EXTN AM ES 29 0 Cont rols sym bol table n aming :0 = Release 14 compatibility. Limits names to 31 characters inlength. Names can include the letters A to Z, the numerals 0 to 9,

and the special characters, dollar sign ($), underscore (_), andhyphen (–).1 = AutoCAD 2000. Names can be up to 255 characters in length,and can include the letters A to Z, the numerals 0 to 9, spaces, andany special characters not used by Microsoft Windows andAutoCAD for other purposes

$FILLETRAD 40 Fillet radius

$FILLMODE 70 Fill mode on if nonzero

$FINGERPRINTGUID 2 Set at creat ion t ime, uniquely ident i fies a particular drawing

$HANDSEED 5 Next available handle

$HYPERLINKBASE 1 Path for all relative hyperlinks in the drawing. If null, the drawingpath is used

$IN SBASE 10 , 20, 30 Insert ion base set by BASE com mand (in WCS)

$INSUNITS 70 Default drawing units for AutoCAD DesignCenter blocks:0 = Unitless; 1 = Inches; 2 = Feet; 3 = Miles; 4 = Millimeters;5 = Centimeters; 6 = M eters; 7 = Kilometers; 8 = Microinches;9 = Mils; 10 = Yards; 11 = Angstroms; 12 = Nanometers;13 = Microns; 14 = Decimeters; 15 = Decameters;16 = Hectometers; 17 = Gigameters; 18 = Astronomical unit s;

19 = Light years; 20 = Parsecs

$JOINSTYLE 280 Lineweight joint sett ing for new objects:0=none; 1= round; 2 = angle; 3 = flat

$LIMCHECK 70 Nonzero if lim its checking is on

$LIMMAX 10, 20 XY drawing limits upper-right corner (in WCS)

$LIMMIN 10, 20 XY drawing limits lower-left corner (in WCS)

$LTSCALE 40 Global linetype scale

$LUNITS 70 Units format for coordinates and distances

$LUPREC 70 Units precision for coordinates and distances



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$LWDISPLAY 290 Cont rols t he display of lineweight s on t he M odel or Layout tab:0 = Lineweight is not displayed1 = Lineweight is displayed

$MAXACTVP 70 Sets maximum number of viewports to be regenerated

$M EASUREM ENT 70 Set s drawing units: 0 = English; 1 = M etric

$MENU 1 Name of menu file

$MIRRTEXT 70 Mirror text if nonzero

$ORTHOMODE 70 Ortho mode on if nonzero

$PDMODE 70 Point Display mode

$PDSIZE 40 Point display size

$PELEVATION 40 Current paper space elevat ion

$PEXTMAX 10, 20, 30 Maximum X , Y , and Z extents for paper space

$PEXTMIN 10, 20, 30 Minimum X , Y , and Z extents for paper space

$PINSBASE 10, 20, 30 Paper space insertion base point

$PLIMCHECK 70 Limits checking in paper space when nonzero

$PLIMMAX 10, 20 Maximum X and Y limits in paper space

$PLIMMIN 10, 20 Minimum X and Y limits in paper space

$PLIN EGEN 70 Governs the generat ion of linetype pat terns around the vert ices of a2D polyline:1 = Linetype is generated in a cont inuous patt ern around vertices ofthe polyline0 = Each segment of the polyline starts and ends with a dash

$PLINEWID 40 Default polyline width

$PROXYGRAPHICS 70 Cont ro ls t he saving of proxy object imag es

$PSLTSCALE 70 Controls paper space linetype scaling:1 = N o special linetype scaling0 = Viewport scaling governs linetype scaling



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$PSTYLEMODE 290 Indicates whether the current draw ing is in a Color-Dependen t orNamed Plot Style mode:0 = Uses color-dependent plot style tables in the current drawing

1 = Uses named plot style tables in the current drawing

$PSVPSCALE 40 View scale factor for new viewports:0 = Scaled to fit>0 = Scale factor (a positive real value)

$PUCSBASE 2 Name of the UCS that defines the origin and orientat ion oforthographic UCS settings (paper space only)

$PUCSNAME 2 Current paper space UCS name

$PUCSORG 10, 20, 30 Current paper space UCS origin

$PUCSORGBACK 10, 20, 30 Point which becomes the new UCS origin after changing paperspace UCS to ‘BACK’ when PUCSBASE is set to WORLD

$PUCSORGBOTTOM 10, 20, 30 Point which becomes the new UCS origin after changing paperspace UCS to ‘BOTTOM’ when PUCSBASE is set to WORLD

$PUCSORGFRONT 10, 20, 30 Point which becomes the new UCS origin after changing paperspace UCS to ‘FRONT’ when PUCSBASE is set to WORLD

$PUCSORGLEFT 10, 20, 30 Point which becomes the new UCS origin after changing paperspace UCS to ‘LEFT’ when PUCSBASE is set to WORLD

$PUCSORGRIGHT 10, 20, 30 Point which becomes the new UCS origin after changing paper

space UCS to ‘RIGHT’ when PUCSBASE is set to WORLD

$PUCSORGTOP 10, 20, 30 Point which becomes the new UCS origin after changing paperspace UCS to ‘TOP’ when PUCSBASE is set to WORLD

$PUCSORTHOREF 2 If paper space UCS is orthographic (PUCSORTHOVIEW not equal to0), this is the name of t he UCS that the orthographic UCS is relat iveto. If blank, UCS is relative to WORLD

$PUCSORTHOVIEW 70 Orthographic view type of paper space UCS:0 = UCS is not orthographic;1 = Top; 2 = Bottom;3 = Front; 4 = Back;

5 = Left ; 6 = Right

$PUCSXDIR 10, 20, 30 Current paper space UCS X axis

$PUCSYDIR 10, 20, 30 Current paper space UCS Y axis



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$QTEXTMODE 70 Quick Text mode on if nonzero

$REGENMODE 70 REGENAUTO mode on if nonzero

$SHADEDGE 70 0 = Faces shaded, edges not highlighted1 = Faces shaded, edges highlighted in black2 = Faces not fi lled, edges in entity color3 = Faces in entity color, edges in black

$SHADEDIF 70 Percent ambient/diffuse light, range 1–100, default 70

$SKETCHINC 40 Sketch record increment

$SKPOLY 70 0 = Sketch lines, 1 = Sketch polylines

$SPLFRAME 70 Spline control polygon display: 1 = On, 0 = Off

$SPLINESEGS 70 Number of line segments per spline patch

$SPLINETYPE 70 Spline curve type for PEDIT Spline

$SURFTAB1 70 Number of mesh tabulations in first direct ion

$SURFTAB2 70 Number of mesh tabulations in second direction

$SURFTYPE 70 Surface type for PEDIT Smooth

$SURFU 70 Surface density (for PEDIT Smooth) in M direction

$SURFV 70 Surface density (for PEDIT Smooth) in N direction

$TDCREATE 40 Local date/time of drawing creation (see “ Special Handling of Date/ Tim e Variables”)

$TDINDWG 40 Cumulat ive editing t ime for this drawing (see “ Special Handling ofDate/ Time Variables” )

$TDUCREATE 40 Universal date/ time the drawing was created (see “ SpecialHandling of Date/Time Variables” )

$TDUPDATE 40 Local date/t ime of last drawing update (see “ Special Handling of

Date/ Time Variables” )

$TDUSRTIMER 40 User-elapsed t imer



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$TDUUPDATE 40 Universal date/ time of the last update/save (see “ Special Handlingof Date/Time Variables” )

$TEXTSIZE 40 Default text height

$TEXTSTYLE 7 Current text style name

$THICKNESS 40 Current thickness set by ELEV command

$TILEMODE 70 1 for previous release compatibility mode, 0 otherwise

$TRACEWID 40 Default trace width

$TREEDEPTH 70 Specifies the maximum depth of the spatial index

$UCSBASE 2 Name of the UCS that defines the origin and orientat ion oforthographic UCS settings

$UCSNAME 2 Name of current UCS

$UCSORG 10, 20, 30 Origin of current UCS (in WCS)

$UCSORGBACK 10, 20, 30 Point which becomes the new UCS origin after changing modelspace UCS to ‘BACK’ when UCSBASEis set to WORLD

$UCSORGBOTTOM 10, 20, 30 Point which becomes the new UCS origin after changing modelspace UCS to ‘ BOTTOM ’ when UCSBASE is set to WORLD

$UCSORGFRONT 10, 20, 30 Point which becomes the new UCS origin after changing modelspace UCS to ‘ FRONT’ when UCSBASE is set to WORLD

$UCSORGLEFT 10, 20, 30 Point which becomes the new UCS origin after changing modelspace UCS to ‘LEFT’ when UCSBASE is set to WORLD

$UCSORGRIGHT 10, 20, 30 Point which becomes the new UCS origin after changing modelspace UCS to ‘ RIGHT’ when UCSBASE is set to WORLD

$UCSORGTOP 10, 20, 30 Point which becomes the new UCS origin after changing modelspace UCS to ‘ TOP’ when UCSBASE is set to WORLD

$UCSORTHOREF 2 If model space UCS is o rthographic (UCSORTHOVIEW not equal to

0), this is the name of t he UCS that the orthographic UCS is relat iveto. If blank, UCS is relative to WORLD



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Revised VPORT Header Variables

The following h eader variables existed before Auto CAD® Release 11 b ut n ow

have independent settings for each active viewport. OPEN h on ors th ese vari-

ables wh en read from DXF™ files. If a VPORT sym bol ta ble with *ACTIVE

ent ries is present (as is tru e for an y DXF file pro du ced by Release 11 or later),

$UCSORTHOVIEW 70 Ort hographic view type of m odel space UCS:0 = UCS is not orthographic;1 = Top; 2 = Bottom;

3 = Front; 4 = Back;5 = Left ; 6 = Right

$UCSXDIR 10, 20, 30 Direction of the current UCS X axis (in WCS)

$UCSYDIR 10, 20, 30 Direction of the current UCS Y axis (in WCS)

$UNITMODE 70 Low bit set = Display fract ions, feet -and-inches, and surveyor’ sangles in input format

$USERI1 – 5 70 Five int eger variables int ended for use by third-part y developers

$USERR1 – 5 40 Five real variables intended for use by t hird-party developers

$USRTIMER 70 0 = Timer off, 1 = Timer on

$VERSIONGUID 2 Uniq uely ident ifies a particular version o f a d raw ing . Up dat ed whenthe drawing is modified

$VISRETAIN 70 0 = Don’t retain xref-dependent visibility sett ings1 = Retain xref-dependent visibilit y settings

$WORLDVIEW 70 1 = Set UCS to WCS during DVIEW/VPOINT0 = Don’t change UCS

$XEDIT 290 Controls whether the current drawing can be edited in-place when

being referenced by another drawing.0 = Can’t use in-place reference editing1 = Can use in-place reference editing



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th e values in th e VPORT table en tries override the values of th ese h eader

variables.

Special Handling of Date/Time Variables

Th e CDATE an d DATE system variables provide access to th e curren t dat e and

time. Th e TDCREATE, TDINDWG, TDUPDATE, and TDUSRTIMER system vari-

ables (an d th e $ TDCREATE, $TDUC REATE, $TDUPDATE, an d $TDUUPDATE

DXF h eader variables) pro vide access to tim es an d d ates associated with th e

current drawing. Th e values are represen ted as real n um bers with special

m ean in gs, as d escribed below.

DATE is th e current date an d tim e represented as a Julian date an d fraction of

a day in a real n um ber.

<Julian date >.<Fraction of day >

Revised VPO RT header variables


$FASTZOOM 70 Fast zoom enabled if nonzero

$GRIDMODE 70 Grid mode on if nonzero

$GRIDUNIT 10, 20 Grid X and Y spacing

$SNAPANG 50 Snap grid rotation angle

$SNAPBASE 10, 20 Snap/grid base point (in UCS)

$SNAPISOPAIR 70 Isometric plane: 0 = Left, 1 = Top, 2 = Right

$SNAPMODE 70 Snap mode on if nonzero

$SNAPSTYLE 70 Snap style: 0 = Standard, 1 = Isometric

$SNAPUNIT 10, 20 Snap grid X and Y spacing

$VIEWCTR 10, 20 XY center of current view on screen

$VIEWDIR 10, 20, 30 Viewing direct ion (d irection from target in WCS)

$VIEWSIZE 40 Height of view

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For exam ple, on December 31, 1999, at 9:58:35 p.m . GMT, th e DATE variable

contains

2451544.91568287

Th e date and time are taken from the co m puter’s clock when the variable is

read. The t ime is represented as a fraction o f a day, do th e times retu rn ed by

DATE m ay be truly sub tracted to com pu te differen ces in tim e. To extract th e

seconds sin ce midn igh t from th e value return ed b y DATE, use th e Auto LISP

expressions:

( s e t q s ( g e t v a r " D A T E " ) )( s e t q s e c o n d s ( * 8 6 4 0 0 . 0 ( - s ( f i x s ) ) ) )

Note that DATE on ly return s a t rue Julian d ate if th e system ’s clock is set to

UTC/Zulu (Green wich Mean Time). TDCREATE and TDUPDATE have th e same

form at as DATE, but their values represen t t h e creation time an d last u pdate

time of th e current drawin g.

TDINDWG an d TDUSRTIMER (and th e $TDINDW G an d $TDUSRTIMER DXF

h eader variables) use a form at similar to th at of DATE, but t h eir values repre-

sen t elapsed t im es, as in :

<Number of days >.<Fraction of day >

CDATE is the current d ate and time in calend ar and clock form at. The value

is return ed as a real num ber in th e form :

YYYYMMDD.HHMMSShsec

where:

YYYY = yearMM = mon th (01-12)

DD = day (01-31)

HH = hours (00-23)

MM = m in ut es (00-59)

SS = secon ds (00-59)

hsec = hun dred th s of a secon d (00-99)

For exam ple, if the curren t date is December 31, 1999, and th e tim e is

9:58:35.75 p.m., CDATE would return the value:

19991231.21583575

Note that CDATE values can be comp ared for later an d earlier values but t ha t

subtractin g them yields nu m bers th at are n ot m eanin gful.

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30

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3

CLASSES Section

Th e group codes d escribed in th is ch apt er are fou n d

on ly in DXF™ files. The CLASSES sectio n h olds th e

inform ation for application -defined classes who se

in stan ces app ear in t h e BLOCKS, ENTITIES, an d

OBJECTS sect ion s of th e dat abase. It is assu med th at a

class defin ition is perm an en tly fixed in t h e class hierar-

ch y. All fields are requ ired.

In this chapter

s CLASSES Section Group Co

3

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32 | Chapter 3 CLASSES Section

CLASSES Section Group Codes

Each en try in th e CLASSES section con tains th e groups d escribed in th e

following table.

CLASSES section group codes


0 Record type (CLASS). Identif ies beg inning of a CLASS record

1 Class DXF record name; always unique

2 C++ class name. Used to bind with software that defines ob ject classbehavior; always unique

3 Applicat ion name. Posted in Alert box when a class def in it ion listed in this

section is not currently loaded

90 Proxy capabil it ies f lag. Bit-coded value that indicates the capabil it ies ofth is object as a proxy:0 = No operations allowed (0)1 = Erase allowed (0x1)2 = Transform allowed (0x2)4 = Color change allowed (0x4)8 = Layer change allowed (0x8)16 = Linetype change allowed (0x10)32 = Linetype scale change allowed (0x20)64 = Visibility change allowed (0x40)128 = Cloning allowed (0x80)256 = Lineweight change allowed (0x100)

512 = Plot Style Name change allowed (0x200)895 = All operations except cloning allowed (0x37F)1023 = All operations allowed (0x3FF)32768 = R13 format proxy (0x8000)

280 Was-a-proxy flag. Set to 1 if class was not loaded when this DXF file wascreated, and 0 otherwise

281 Is-an-entity flag. Set to 1 if class was derived from the AcDbEntity class andcan reside in the BLOCKS or ENTITIES sect ion. If 0, instances may appearonly in t he OBJECTS section

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CLASSES Section Group Codes | 33

Default Class Values

Aut oCAD registers th e classes listed in th e following table. (Th is m ay n ot be

a com plete list of th e classes fou nd in a DXF file. It dep en ds on th e app lica-

tions cu rren tly in use by Aut oCAD® .)

Default class values

DXF record namecode 1

C++ class namecode 2

Code90

Code280

Code281

ACDBDICTIONARYWDFLT AcDbDictionaryWithDefault 0 0 0

ACDBPLACEHOLDER AcDbPlaceHolder 0 0 0

ARCALIGNEDTEXT AcDbArcAlignedText 0 0 1

DICTIONARYVAR AcDbDictionaryVar 0 0 0

HATCH AcDbHatch 0 0 1

IDBUFFER AcDbIdBuffer 0 0 0

IMAGE AcDbRasterImage 127 0 1

IMAGEDEF AcDbRasterImageDef 0 0 0

IMAGEDEF_REACTOR AcDbRasterImageDefReactor 1 0 0

LAYER_INDEX AcDbLayerIndex 0 0 0

LAYOUT AcDbLayout 0 0 0

LWPOLYLINE AcDbPolyline 0 0 1

OBJECT_PTR CAseDLPNTableRecord 1 0 0

OLE2FRAME AcDbOle2Frame 0 0 1

PLOTSETTINGS AcDbPlotSettings 0 0 0

RASTERVARIABLES AcDbRasterVariables 0 0 0

RTEXT RText 0 0 1

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34 | Chapter 3 CLASSES Section

SORTENTSTABLE AcDbSortentsTable 0 0 0

SPATIAL_INDEX AcDbSpat ialIndex 0 0 0

SPATIAL_FILTER AcDbSpat ialFilter 0 0 0

WIPEOUT AcDbWipeout 127 0 1

WIPEOUTVARIABLES AcDbWipeoutVariables 0 0 0

Default class values (continued )

DXF record namecode 1

C++ class namecode 2

Code90

Code280

Code281

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3

TABLES Section

Th e group codes d escribed in th is ch apt er are fou n d

in DXF™ files and used by ap plication s. Th e TABLES

section con tain s several tables, each of which can

cont ain a variable n um ber of entries. Th ese codes are

also u sed b y Aut oLISP® an d O bjectARX™ application s

in en tity defin ition lists.

In this chapter

s Symbol Table Group Codes

s Common Symbol Table Gro

Codes

s APPIDs BLOCK_RECORD

s DIMSTYLE

s LAYER

s LTYPE

s STYLE

s UCS

s VIEW

s VPORT

4

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36 | Chapter 4 TABLES Section

Symbol Table Group Codes

The order of t h e tables may chan ge, but th e LTYPE table always precedes the

LAYER table. Each table is intro duced with a 0 group code with th e label

TABLE. This is followed by a 2 grou p cod e iden tifying th e part icular table

(APPID, DIMSTYLE, LAYER, LTYPE, STYLE, UCS, VIEW, VPORT, orBLOCK_RECORD), a 5 group code (a h an dle), a 100 group cod e

(AcDbSymbolTable subclass marker), and a 70 group code that specifies the

m axim um n um ber of table en tries that m ay follow. Table n ames are outpu t

in up percase cha racters. Th e DIMSTYLE h an dle is a 105 group cod e n ot a 5

group code.

The tables in a drawing can con tain d eleted item s, but th ese are not written

to t h e DXF file. As a result, fewer table en tries m ay follow t h e table h eader

than are ind icated by th e 70 group code, so do n ot u se the coun t in th e 70

grou p code as an index to read in th e table. Th is group cod e is provided so

th at a p rogram th at reads DXF files can allocate an array large en ou gh t o h oldall th e table ent ries th at follow.

Followin g th is header for each table are th e table en tries. Each tab le en try

con sists of a 0 group ident ifyin g th e item type (sam e as table nam e, such as

LTYPE or LAYER), a 2 gro up giving th e n am e of th e t able en try, a 70 group

specifying flags relevant to th e tab le en try (defined for each following t able),

an d addition al grou ps that give th e value of th e table en try. Th e en d of each

table is in dicated by a 0 grou p with th e value ENDTAB.

Both sym bo l table records an d symb ol tables are datab ase objects. At a ver y

m in im um , with all prevailing usage with in AutoCAD®, th is im plies that a

h andle is present , positioned after the 2 group codes for both the symbo ltable record ob jects and th e sym bol tab le objects.

Th e DIMSTYLE tab le is th e on ly record t ype in th e system with a ha nd le code

of 105 because of its earlier usage of group code 5. As a rule, programmers

sh ould n ot be concerned abou t th is exception u nless it is in th e context of

th e DIMSTYLE table section . This is th e on ly con text in wh ich th is except ion

sh ould o ccur.

Common Symbol Table Group Codes

Th e followin g table sh ows group cod es th at ap ply to all sym bol tables. For

in form ation about abbreviations an d form atting used in t h is table, see “For-

m atting Con vention s in This Reference” on page 6.

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Common Symbol Table Group Codes | 37

Common Group Codes for Symbol Table Entries

Th e followin g table sh ows grou p codes th at app ly to all sym bol tab le en tries.

Wh en you refer to the t able of group codes by en tity type, which lists th e

codes associated with specific en tities, keep in m in d th at th e cod es sh own

h ere can also be p resent . For information about abbreviation s and form atting

used in t h is table, see “Form atting Con vention s in Th is Referen ce” on page 6.

Group codes that apply to all symbol tables


–1 APP: ent ity name (ch anges each t ime a d raw ing is opened)

0 Object type (TABLE)

2 Table name

5 Handle

102 “{ACAD_XDICTIONARY” indicates the start of an extension dict ionarygroup. This group exists only if persistent reactors have been attachedto t his object (opt ional)

360 Hard owner ID/ handle to ow ner dict ionary (optional)

102 End of group, “ }” (optional)

330 Soft-pointer ID/ handle to owner object

100 Subclass marker (AcDbSymbolTable)

70 Maximum number of entries in table

Group codes that apply to all symbol table entries


–1 APP: ent ity name (ch anges each t ime a d raw ing is opened)

0 Entity type (table name)

5 Handle (all except DIMSTYLE)

105 Handle (DIMSTYLE table only)

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APPID

Th e followin g group cod es apply to APPID sym bol ta ble en tries. In add ition

to t h e grou p codes described h ere, see “Comm on Group Codes for Symb ol

Table Ent ries” on page 37 . For information about abbreviation s an d format -

ting u sed in t h is table, see “Form att in g Con vention s in Th is Referen ce” on

page 6.

102 Start of application-defined group “ {application_name ” . For example,“ {ACAD_REACTORS” indicates the start of the AutoCAD persistentreactors group (optional)

application- defined codes

Codes and values with in the 102 groups are appl icat ion defined(optional)

102 End of group, “ }” (opt ional)

102 “ {ACAD_REACTORS” indicates the start of the AutoCAD persistentreactors group. This group exists only if persistent reactors have beenattached t o this object (opt ional)

330 Soft pointer ID/handle to owner dictionary (opt ional)


102 “ {ACAD_XDICTIONARY” indicates the start of an extension dictionarygroup. This group exists only if persistent reactors have been attachedto t his object (opt ional)

360 Hard owner ID/handle to owner dictionary (opt ional)



100 Sub class m arker (AcDbSymbolTab leRecord)

Group codes that apply to all symbol table entries (continued )


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BLOCK_RECORD | 39

BLOCK_RECORD

The followin g group codes ap ply to BLOCK_RECORD sym bol tab le ent ries.

In add ition to th e group codes described h ere, see “Com m on Group Codes

for Sym bol Table Entries” on page 37 . For informat ion about ab breviations

an d form atting used in th is table, see “Form attin g Con vent ion s in Th is Ref-

eren ce” on p age 6.

APPID group codes

Group codes Description

100 Sub class m arker (AcDbReg App TableRecord)

2 User-supplied (o r application -supplied ) application name (for extended

data). These table entries maint ain a set of names for all registeredapplications

70 Standard flag values (bit -coded values):1 = If set, xdata associated with this APPID is not written whenSAVEASR12 is perform ed16 = If set, table entry is externally dependent on an x ref32 = If this bit and bit 16 are both set, the externally dependent xrefhas been successfully resolved64 = If set, the table ent ry was referenced by at least one ent ity in thedrawing the last time the drawing was edited. (This flag is for thebenefit of AutoCADcommands. It can be ignored by most programsthat read DXF files and need not be set by programs that write DXFfiles)

BLOCK_RECORD group codes


100 Subclass m arker (AcDbBlockTableRecord)

2 Block name

340 Hard-pointer ID/hand le to associated LAYOUT ob ject

310 DXF: Binary data for bit map preview (optional)

1001 Xdata applicat ion name “ ACAD” (opt ional)

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DIMSTYLE

The followin g group codes ap ply to DIMSTYLE sym bol t able en tries. The

DIMSTYLE system variables are described in app end ix B, “System Variables,”

in th e Comm and Reference. In addition to th e group codes described h ere, see

“Com m on G roup C odes for Sym bo l Table Ent ries” on page 37. For informa-

tion about abbreviations and formatting used in this table, see “Formatting

Con ven tion s in Th is Referen ce” on page 6.

1000 Xd ata string d ata “ Design Cent er Data” (op tional)

1002 Begin xdata “ {“ (optional)

1070 Autodesk Design Cent er version number

1070 Insert units:0 = Unit less; 1 = Inches; 2 = Feet; 3 = M iles; 4 = Millimeters;5 = Centimeters; 6 = Meters; 7 = Kilometers; 8 = Microinches;9 = Mils; 10 = Yards; 11 = Angstroms; 12 = Nanometers;13 = Microns; 14 = Decimeters; 15 = Decameters;16 = Hectometers; 17 = Gigameters; 18 = Astronomical unit s;19 = Light years; 20 = Parsecs

1002 End xdata “ }“

DIMSTYLE group codes


100 Sub class m arker (AcDbDimStyleTableRecord )

2 Dimension style name

70 Standard flag values (bit -coded values):16 = If set, table entry is externally dependent on an xref32 = If this bit and bit 16 are both set, the externally dependent xrefhas been successfully resolved64 = If set, the table entry was referenced by at least one ent ity in thedrawing the last time the drawing was edited. (This flag is for thebenefit of AutoCAD® commands. It can be ignored by most programsthat read DXF™ files and need not be set by programs that write DXFfiles)

BLOCK_RECORD group codes (continued )


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DIMSTYLE | 41

3 DIMPOST

4 DIMAPOST

5 DIMBLK (obsolete, now object ID)

6 DIMBLK1 (obsolete, now object ID)

7 DIMBLK2 (obsolete, now object ID)

40 DIMSCALE

41 DIMASZ

42 DIMEXO

43 DIMDLI

44 DIMEXE

45 DIMRND

46 DIMDLE

47 DIMTP

48 DIMTM

140 DIMTXT

141 DIMCEN

142 DIMTSZ

143 DIMALTF

144 DIMLFAC

145 DIMTVP

146 DIMTFAC

147 DIMGAP

148 DIMALTRND

DIMSTYLE group codes (continued )


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71 DIMTOL

72 DIMLIM

73 DIMTIH

74 DIMTOH

75 DIMSE1

76 DIMSE2

77 DIMTAD

78 DIMZIN

79 DIMAZIN

170 DIMALT

171 DIMALTD

172 DIMTOFL

173 DIMSAH

174 DIMTIX

175 DIMSOXD

176 DIMCLRD

177 DIMCLRE

178 DIMCLRT

179 DIMADEC

270 DIM UNIT (o bso let e, n ow use DIM LUN IT AN D DIM FRAC)

271 DIMDEC

272 DIMTDEC

273 DIMALTU



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DIMSTYLE | 43

274 DIMALTTD

275 DIMAUNIT

276 DIMFRAC

277 DIMLUNIT

278 DIMDSEP

279 DIMTMOVE

280 DIMJUST

281 DIMSD1

282 DIMSD2

283 DIMTOLJ

284 DIMTZIN

285 DIMALTZ

286 DIMALTTZ

287 DIMFIT (obsolete, now use DIMATFIT and DIMTMOVE)

288 DIMUPT

289 DIMATFIT

340 DIM TXSTY (handle of referenced STYLE)

341 DIM LDRBLK (handle of referenced BLOCK)

342 DIMBLK (handle of referenced BLOCK)

343 DIM BLK1 (handle of referenced BLOCK)

344 DIM BLK2 (handle of referenced BLOCK)

371 DIMLWD (lineweight enum value)

372 DIMLWE (lineweight enum value)



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LAYER

The followin g group cod es apply to LAYER sym bol tab le entries. In ad dition



ting u sed in t h is table, see “Form att in g Con vention s in Th is Referen ce” onpage 6.

Xref-dependent layers are output during SAVEAS. For th ese layers, th e associ-

ated linetyp e n am e in th e DXF file is always CONTINUOUS.

LAYER group codes


100 Sub class m arker (AcDbLayerTab leRecord )

2 Layer name

70 Standard flags (bit-coded values):

1 = Layer is frozen; otherwise layer is thawed2 = Layer is frozen by default in new viewpor ts4 = Layer is locked16 = If set, table entry is externally dependent on an xref32 = If this bit and bit 16 are both set, the externally dependent xrefhas been successfully resolved64 = If set, the table entry was referenced by at least one ent ity in thedrawing the last time the drawing was edited. (This flag is for thebenefit of AutoCAD commands. It can be ignored by most programsthat read DXF files and need not be set by programs that write DXFfiles)

62 Color number (if negat ive, layer is off)

6 Linetype name

290 Plotting flag. If set to 0, do not plot this layer

370 Lineweight enum value

390 Hard pointer ID/ handle of Plot St yleN ame object

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LTYPE | 45

LTYPE

The following group codes apply to LTYPE symbol table entries. In addition


Table Ent ries” on page 37 . For information about abbreviations and form at-

ting u sed in t h is table, see “Form att in g Con vention s in Th is Referen ce” onpage 6.

LTYPE group codes


100 Sub class m arker (AcDbLinet ypeTab leRecord )

2 Linetype name

70 Standard flag values (b it-coded values):

16 = If set, table entry is externally dependent on an x ref32 = If this bit and bit 16 are both set, the externally dependent xrefhas been successfully resolved64 = If set, the table ent ry was referenced by at least one ent ity in thedrawing the last time the drawing was edited. (This flag is for thebenefit of AutoCAD commands. It can be ignored by most programsthat read DXF files and need not be set by programs that write DXFfiles)

3 Descript ive text for linetype

72 Alignmen t code; value is alw ays 65, t he ASCII code for A

73 The number of linetype elements

40 Total pattern length

49 Dash, dot or space lengt h (one ent ry per element )

74 Complex linetype element t ype (one per element ). Default is 0 (noembedded shape/text).The following codes are bit values:1 = If set, code 50 specifies an absolute rotation; if not set, code 50specifies a relative rotation2 = Embedded element is a text str ing4 = Embedded element is a shape

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Th e group codes 74, 75, 340, 46, 50, 44, 45, and 9 are n ot return ed by th e

t b l s e a r c h or t b l n e x t fun ctions. You m ust use t b l o b j n a me to retrieve these

values within an application .

STYLE

The following grou p cod es app ly to STYLE sym bol tab le en tries. In addit ionto t h e grou p codes described h ere, see “Comm on Group Codes for Symb ol



page 6.

75 Shape number (one per element) if code 74 specifies an embeddedshape.If code 74 specifies an embedded t ext string, this value is set to 0

If code 74 is set to 0, code 75 is omitted

340 Po in ter to STYLE object (one per element if code 74 > 0)

46 S = Scale value (op tion al); mu lt iple ent ries can exist

50 R = (relat ive) or A = (abso lu te) rotation value in radians of embeddedshape or text; one per element if code 74 specifies an embedded shapeor text string

44 X = X offset value (optional); mult iple entries can exist

45 Y = Y offset value (opt ional); mult iple entries can exist

9 Text string (one per element if code 74 = 2)

STYLE group codes


100 Subclass marker (AcDbTex tStyleTab leRecord )

2 Style name

LTYPE group codes (continued )


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UCS | 47

A STYLE table item is also u sed to record shap e file LOAD comm and requests.In t his case th e first b it (1) is set in th e 70 group flags and on ly the 3 grou p

(sh ape file nam e) is m ean ingful (all th e oth er group s are outpu t, h owever).

UCS

Th e following group codes app ly to UCS sym bol table en tries. In add ition t o

th e group co des described here, see “Com m on Group Co des for Sym bol Table

En tries” on page 37 . For information about abbreviation s an d formattin g


70 Standard flag values (bit -coded values):1 = If set, this entry describes a shape4 = Vertical text

16 = If set, table entry is externally dependent on an x ref32 = If this bit and bit 16 are both set, the externally dependent xrefhas been successfully resolved64 = If set, the table ent ry was referenced by at least one ent ity in thedrawing the last time the drawing was edited. (This flag is for thebenefit of AutoCAD commands. It can b e ignored by m ost programsthat read DXF files and need not be set by programs that write DXFfiles)

40 Fixed text height; 0 if not fixed

41 Width factor

50 Oblique angle

71 Text generation flags:2 = Text is backward (mirrored in X )4 = Text is upside down (mirrored in Y )

42 Last height used

3 Primary font file name

4 Bigfont file name; blank if none

STYLE group codes (continued )


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UCS group codes


100 Subclass m arker (AcDbUCSTableRecord)

2 UCS name

70 Standard flag values (bit -coded values):16 = If set, table entry is externally dependent on an xref32 = If this bit and bit 16 are both set, the externally dependent xrefhas been successfully resolved64 = If set, the table entry was referenced by at least one ent ity in thedrawing the last time the drawing was edited. (This flag is for thebenefit of AutoCAD commands. It can be ignored by most programsthat read DXF files and need not be set by programs that write DXFfiles)

10 Origin (in WCS)DXF: X value; APP: 3D point

20, 30 DXF: Y and Z values of origin ( in WCS)

11 X -axis direction (in WCS)DXF: X value; APP: 3D vector

21, 31 DXF: Y and Z values of X -axis direction (in WCS)

12 Y -axis direction (in WCS)DXF: X value; APP: 3D vector

22, 32 DXF: Y and Z values of Y -axis direction (in WCS)

79 Always 0

146 Elevat ion

346 ID/handle of base UCS if this is an orthographic. This code is notpresent if the 79 code is 0. If t his code is not present and 79 code isnon-zero, then base UCS is assumed to be WORLD

71 Orthographic t ype (opt ional; always appears in pairs with the 13 , 23,33 codes):1 = Top; 2 = Bottom;3 = Front; 4 = Back;5 = Left; 6 = Right

13 Origin for t his ort hographic t ype relative t o this UCS.DXF: X value of origin point; APP: 3D point

23, 33 DXF: Y and Z values of origin point

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VIEW | 49

Each 71/ 13,23,33 pair d efines th e UCS origin for a particular orth ograph ic

type relative to th is UCS. For in stance if th e followin g pair is present , th en

invo king t he UC S/LEFT comm an d w h en UC SBASE is set to t h is UCS will

cause the new UCS origin t o becom e (1,2,3).

7 1 : 51 3 : 1 . 0

2 3 : 2 . 03 3 : 3 . 0

If th is pair were n ot present , then in voking th e UCS/LEFT com m an d wou ld

cause the new UCS origin to be set to this UCS’s origin point.

VIEW

Th e followin g grou p cod es apply to VIEW sym bol table ent ries. In add ition


Table Ent ries” on page 37 . For information about abbreviations and form at-ting u sed in t h is table, see “Form att in g Con vention s in Th is Referen ce” on

page 6.

VIEW group codes


100 Subclass m arker (AcDbView TableRecord)

2 Name of view

70 Standard flag values (b it-coded values):1 = If set, this is a paper space view16 = If set, table entry is externally dependent on an x ref32 = If this bit and bit 16 are both set, the externally dependent xrefhas been successfully resolved64 = If set, the table ent ry was referenced by at least one ent ity in thedrawing the last time the drawing was edited. (This flag is for thebenefit of AutoCAD commands. It can be ignored by most programsthat read DXF files and need not be set by programs that write DXFfiles)

40 View height (in DCS)

10 View center point (in DCS)DXF: X value; APP: 2D point

20 DXF: Y value of view center point (in DCS)

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Th e followin g cod es on ly ap pear if cod e 72 is set to 1 . Th ey defin e th e UCS

th at is associated to th is view. Th is UCS will becom e th e curren t UCS wh en -

ever th is view is restored (if cod e 72 is 0, th e UCS is un ch an ged).

41 View width (in DCS)

11 View direction from target (in WCS)

DXF: X value; APP: 3D vector

21, 31 DXF: Y and Z values of view direction from target (in WCS)

12 Target point (in WCS)DXF: X value; APP: 3D point

22, 32 DXF: Y and Z values of target point (in WCS)

42 Lens length

43 Front clipping plane (offset from target point)

44 Back clipping plane (offset from target point)

50 Twist angle

71 View mode (see VIEWM ODE system variable)

281 Render mode:0 = 2D Optimized (classic 2D)1 = Wireframe2 = Hidden line3 = Flat shaded4 = Gouraud shaded5 = Flat shaded with wireframe

6 = Gouraud shaded with wireframe

All rendering modes other than 2D Optimized engage the new 3Dgraphics pipeline. These values directly correspond to the SHADEMODEcommand and the AcDbAbstractViewTableRecord::RenderMode enum

72 1 if th ere is a UCS asso ciat ed to t his view, 0 oth erw ise

VIEW group codes (continued )


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VPORT | 51

VPORT

The following grou p cod es apply to VPORT symb ol tab le en tries. Th e VPORT

table is un ique: it m ay con tain several ent ries with th e same n ame (ind icat-

in g a m ultiple-viewport con figuration ). Th e ent ries correspond in g to t he

active viewp ort con figuration all h ave th e n am e *ACTIVE. The first such

entry describes the current viewport. In add ition to th e group codes

described h ere, see “Com m on Group Codes for Sym bol Table Ent ries” on

VIEW with UCS group codes


110 UCS origin (appears only if code 72 is set to 1)DXF: X value; APP: 3D point

120, 130 DXF: Y and Z values of UCS origin

111 UCS X -axis (appears only if code 72 is set to 1)DXF: X value; APP: 3D vector

121, 131 DXF: Y and Z values of UCS X -axis

112 UCS Y -axis (appears only if code 72 is set t o 1)DXF: X value; APP: 3D vector

122, 132 DXF: Y and Z values of UCS Y -axis

79 Ort hog rap hic t ype of UCS (app ears o nly if code 7 2 is set to 1):

0 = UCS is not orthographic;1 = Top; 2 = Bottom;3 = Front; 4 = Back;5 = Left; 6 = Right

146 UCS Elevat ion (appears only if code 72 is set to 1)

345 ID/handle of AcDbUCSTableRecord i f UCS is a named UCS. I f notpresent, then UCS is unnamed (appears only if code 72 is set t o 1)

346 ID/handle of AcDbUCSTableRecord of base UCS i f UCS is orthographic(79 code is non-zero). If not present and 79 code is non-zero, then baseUCS is taken to be WORLD (appears only if code 72 is set to 1)

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page 37. For information about abbreviations and form atting used in th is


VPORT group codes


100 Sub class m arker (AcDbView po rt Tab leRecord )

2 Viewport name

70 Standard flag values (bit -coded values):16 = If set, table entry is externally dependent on an xref32 = If this bit and bit 16 are both set, the externally dependent xrefhas been successfully resolved64 = If set, the table entry was referenced by at least one ent ity in thedrawing the last time the drawing was edited. (This flag is for thebenefit of AutoCAD commands. It can be ignored by most programsthat read DXF files and need not be set by programs that write DXFfiles)

10 Lower-left corner of viewportDXF: X value; APP: 2D point

20 DXF: Y value of lower-left corner of viewport

11 Upper-right corner of viewportDXF: X value; APP: 2D point

21 DXF: Y value of upper-right corner of viewport

12 View center point (in DCS)

DXF: X value; APP: 2D point

22 DXF: Y value of view center point (in DCS)

13 Snap base pointDXF: X value; APP: 2D point

23 DXF: Y value of snap base point

14 Snap spacing X and Y DXF: X value; APP: 2D point

24 DXF: Y value of snap spacing X and Y

15 Grid spacing X and Y DXF: X value; APP: 2D point

25 DXF: Y value of grid spacing X and Y

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VPORT | 53

16 View direction from target point (in WCS)DXF: X value; APP: 3D point

26, 36 DXF: Y and Z values of view direction from target point(in WCS)

17 View target point (in WCS)DXF: X value; APP: 3D point

27, 37 DXF: Y and Z values of view t arget point (in WCS)

40 View height

41 Viewport aspect ratio

42 Lens length

43 Front clipping plane (offset from target point)

44 Back clipping plane (offset from target point)

50 Snap rotation angle

51 View twist angle

68 APP: Status field (never saved in DXF)

69 APP: ID (never saved in DXF)

71 View mode (see VIEWM ODE system variable)

72 Circle zoom percent

73 Fast zoom sett ing

74 UCSICON setting

75 Snap on/off

76 Grid on/off

77 Snap style

78 Snap isopair

VPORT group codes (continued )


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281 Render mode:0 = 2D Optimized (classic 2D)1 = Wireframe

2 = Hidden line3 = Flat shaded4 = Gouraud shaded5 = Flat shaded with wireframe6 = Gouraud shaded with wireframe


65 Value of UCSVP for this viewport . If set to 1 , then viewport stores itsown UCS which w ill become the current UCS whenever the viewport isactivated. If set to 0, UCS will not change when this viewport isactivated

110 UCS originDXF: X value; APP: 3D point


111 UCS X -axisDXF: X value; APP: 3D vector


112 UCS Y -axisDXF: X value; APP: 3D vector


79 Orthographic type of UCS0 = UCS is not orthographic;1 = Top; 2 = Bottom;3 = Front; 4 = Back;5 = Left; 6 = Right

146 Elevat ion

345 ID/handle of AcDbUCSTableRecord i f UCS is a named UCS. I f notpresent, then UCS is unnamed

346 ID/handle of AcDbUCSTableRecord of base UCS i f UCS is orthographic(79 code is non-zero). If not p resent and 79 code is non-zero, then baseUCS is taken t o be WORLD

VPORT group codes (continued )


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5

BLOCKS Section

Th e group codes d escribed in th is ch apt er are fou n d in

DXF™ files an d used by ap plication s. Th e BLOCKS

section conta ins an entry for each block referen ce in th e

drawing.

In this chapter

s BLOCKS Section Group Co

s BLOCK

s ENDBLK

5

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56 | Chapter 5 BLOCKS Section

BLOCKS Section Group Codes

The BLOCKS section of th e DXF file con tain s all th e block defin ition s,

in cludin g ano n ymo us blocks gen erated by the HATCH com man d and by

associative dim en sion in g. Each b lock defin ition con tains th e entities th at

m ake up th at block as it is used in th e drawin g. Th e form at of th e en tities inth is section is iden tical to th ose in th e ENTITIES section. All en tities in th e

BLOCKS section app ear between block an d end blk en tities. Block an d en dblk

entities appear only in the BLOCKS section. Block definitions are never

n ested (th at is, no block or en dblk en tity ever app ears within an oth er block-

endblk pair), altho ugh a b lock definition can con tain an insert entity.

External references are written in the DXF file as block definitions, except

th at t hey also include a string (group co de 1) th at specifies th e pa th an d file

n am e of the external reference.

Th e block table h an dle, alon g with an y xdata an d persistent reactors, appears

in each block defin ition im m ediately followin g the BLOCK record, which

con tains all of th e specific in format ion th at a block table record stores.

BLOCK

Th e followin g group codes apply to block ent ities. For inform ation abou t

abbreviation s and form atting used in th is table, see “Form atting Conven-

tions in Th is Reference” on page 6.

Block group codes


0 Ent ity type (BLOCK)

5 Handle

102 Start of applicat ion-defined group “ {application_name ” . For example,“ {ACAD_REACTORS” indicates the start of the AutoCAD persistentreactors group (optional)





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BLOCK | 57

Th e UCS in effect wh en a block definition is created becom es th e WCS for all

ent ities in th e block definition . Th e new o rigin for these entities is sh ifted t o

m atch th e base point d efin ed for th e block definit ion . All ent ity data is tran s-

lated to fit th is new W CS.

Model Space and Paper Space Block Definitions

Three emp ty d efinition s always appear in th e BLOCKS section . Th ey are

titled *Mod el_Space, *Paper_Space an d *Paper_Space0. These d efin ition s

m an ifest th e represen tation s of m odel space an d pap er space as block

defin itions int ern ally. Th e in terna l n am e of th e first p aper space layout is

100 Subclass marker (AcDbEntity)

8 Layer name

100 Subclass marker (AcDbBlockBegin)

2 Block name

70 Block-typ e flags (bit coded values, may be comb in ed):0 = Indicates none of the following flags apply1 = This is an anonymous block generated by hatching, associativedimensioning, other internal operations, or an application2 = This block has non-constant att ribute definitions (this bi t is not set ifthe block has any attribute definitions that are constant, or has noattribute definitions at all)4 = This block is an external reference (xref)

8 = This block is an xref overlay16 = This block is externally dependent32 = This is a resolved external reference, or dependent of an externalreference (ignored on input)64 = This definition is a referenced external reference (ignoredon input)

10 Base pointDXF: X value; APP: 3D point

20, 30 DXF: Y and Z values of base point

3 Block name

1 Xref path name

4 Block descript ion (opt ional)

Block group codes (continued )


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58 | Chapter 5 BLOCKS Section

*Paper_Space, th e secon d is *Paper_Space0, th e t h ird *Paper_Space1, a nd

so o n.

Model Space and Paper Space Entity Segregation

Th e in terleavin g between m odel space an d pap er space n o lon ger occurs.

Instead, all paper space en tities are outp ut , followed b y m od el space en tities.

Th e flag distin guishing th em is th e grou p code 67.

ENDBLK

Th e followin g group codes apply to en dblk objects. For inform ation about

abbreviation s and form atting used in th is table, see “Form atting Conven-

tions in Th is Reference” on page 6.

Endblk group codes


0 Ent ity type (ENDBLK)

5 Handle

102 Start of application-defined group “ {application_name ” . For example,“ {ACAD_REACTORS” indicates the start of the AutoCAD persistentreactors group (optional)





100 Subclass marker (AcDbEntity)

8 Layer name

100 Subclass marker (AcDbBlockEnd)

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5

ENTITIES Section

Th is chapt er presents th e group codes th at apply to

graph ical objects. Th ese codes are fou n d in th e

ENTITIES sect ion of a DXF™ file an d are u sed by

Au to LISP® an d O bjectARX™ application s in en tity

defin ition lists.

In this chapter

s Common Group Codes for Entit

s 3DFACE

s 3DSOLID

s ACAD_PROXY_ENTITY

s ARC

s ATTDEFs ATTRIB

s BODY

s CIRCLE

s DIMENSION

s ELLIPSE

s HATCH

s IMAGE

s INSERT

s LEADER

s LINE

s LWPOLYLINE

s MLINE

s MTEXTs OLEFRAME

s OLE2FRAME

s POINT

s POLYLINE

s RAY

s REGION

s SEQEND

s SHAPE

s SOLID

s SPLINE

s TEXT

sTOLERANCE

s TRACE

s VERTEX

s VIEWPORT

s XLINE

6

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60 | Chapter 6 ENTITIES Section

Common Group Codes for Entities

Th e followin g table sh ows group cod es th at app ly to virtu ally all graph ical

objects. Som e of th e group cod es shown h ere are in clud ed with an en tity def-

in ition only if the en tity has non default values for the p roperty. Wh en you

refer to th e group codes by ent ity t ype, the lists of codes associated wit hspecific entities, keep in m ind t h at th e codes sh own h ere are also p resent.

NOT E Do not write programs that rely on the order shown in these DXF code

tables. Although these tables show the order of group codes as they usually

appear, the order can change under certain conditions or may be changed in a

future AutoCAD ® release. The code that cont rols an enti ty should be driven by

a case (switch) or a table so that it can process each group correctly even if the

order is unexpected.

Wh en a group is omitted, its default value up on in put (when using OPEN) isin dicated in the t h ird column . If the value of a group code is equal to th e

default, it is omitted upo n outpu t (wh en u sing SAVEAS). For information

about abbreviations and formatting used in this table, see “Forma ttin g Con -

vention s in Th is Referen ce” on p age 6.

Group codes that apply to all graphical objects

Group code DescriptionIf omitted,defaults to…

–1 APP: ent ity name (changes each time adrawing is opened)

not omitted

0 Ent ity type not omitted

5 Handle not omitted

102 Start of applicat ion defined group“ {application_name ” (optional)

no default


Codes and values with in the 102 groups areapplication-defined (opt ional)

no default

102 End of group, “ }” (opt ional) no default

102 “ {ACAD_REACTORS” indicates the start of theAutoCAD persistent reactors group. This groupexists only if persistent reactors have beenattached t o this object (optional)

no default

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Common Group Codes for Entities | 61

330 Soft pointer ID/handle to owner dictionary(optional)

no default

102 End of group, “ }” (optional) no default

102 “ {ACAD_XDICTIONARY” ind icates the start ofan extension dictionary group. This groupexists only if persistent reactors have beenattached t o this object (opt ional)

no default

360 Hard owner ID/handle to owner dictionary(optional)

no default

102 End of group, “ }” (optional) no default

330 Soft-pointer ID/ handle to ownerBLOCK_RECORD object

not omitted

100 Subclass marker (AcDbEntity) not omitted

67 Absent or zero indicates entit y is in modelspace. 1 indicates entity is in paper space(optional)

0

410 APP: layout tab name not omitted

8 Layer name not omitted

6 Linetype name (present if not BYLAYER). The

special name BYBLOCK indicates a floatinglinetype (optional)

BYLAYER

62 Color num ber (present if not BYLAYER); zeroindicates the BYBLOCK (floating) color; 256indicates BYLAYER; a negative value indicatesthat the layer is turned off (optional)

BYLAYER

370 Lineweight enum value. Stored and movedaround as a 16-bit integer.

not omitted

48 Linetype scale (opt ional) 1.0

60 Object visibilit y (option al): 0 = Visible, 1 =Invisible

0

92 The number of bytes in the image (andsubsequent binary chunk records) (opt ional)

no default

Group codes that apply to all graphical objects (continued )


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3DFACE

Th e following grou p codes apply to 3dface entities. In add ition to t he group

codes described here, see “Com m on Group Cod es for En tities” on p age 60.

For in form ation ab out abbreviation s an d form attin g used in t h is table, see

“Form atting Con ventio n s in This Reference” on page 6.

310 Preview image data (multiple lines; 256charaters max. per line) (optional)

no default

3dface group codes


100 Subclass marker (AcDbFace)

10 First corner (in WCS)DXF: X value; APP: 3D point

20, 30 DXF: Y and Z values of first corner (in WCS)

11 Second corner (in WCS)DXF: X value; APP: 3D point

21, 31 DXF: Y and Z values of second corner (in WCS)

12 Third corner (in WCS)DXF: X value; APP: 3D point

22, 32 DXF: Y and Z values of third corner (in WCS)

13 Fourth corner (in WCS). If only three corners are entered, th is is thesame as the third cornerDXF: X value; APP: 3D point

23, 33 DXF: Y and Z values of fourth corner (in WCS)

70 Invisible edge flags (opt ional; default = 0):1 = First edge is invisible2 = Second edge is invisible4 = Third edge is invisib le8 = Fourth edge is invisible

Group codes that apply to all graphical objects (continued )


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3DSOLID | 63

3DSOLID

Th e followin g grou p codes app ly to 3dsolid en tities. In add ition to th e group


For inform ation about abbreviation s and form atting u sed in th is table, see


ACAD_PROXY_ENTITY

Th e followin g grou p codes apply to proxy en tities. In add ition to th e group




3dsolid group codes


100 Subclass m arker (AcDbM odelerGeometry)

70 Modeler format version number (currently = 1)

1 Propriet ary dat a (mult iple lines < 255 characters each)

3 Additional lines of proprietary data (if previous group 1 string is greaterthan 255 characters) (optional)

Acad_proxy_ent ity group codes


100 DXF™: AcDbProxyEntit y

90 DXF: Proxy entity class ID (always 498)

91 DXF: Application entity’s class ID. Class IDs are based on the order ofthe class in the CLASSES section. The first class is given the ID of 500,the next is 501, and so on

92 DXF: Size of graphics data in bytes

310 DXF: Binary graphics data (mult iple entries can appear) (optional)

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ARC

Th e followin g grou p codes apply to arc en tities. In add ition to th e grou p




93 DXF: Size of entity data in bits

310 DXF: Binary entit y data (multiple entries can appear) (opt ional)

330 or 340or 350 or 360

DXF: An object ID (multiple entries can appear) (optional)

94 DXF: 0 (indicates end of object ID section)

95 DXF: Object drawing format w hen it b eco mes a p ro xy (a 32-b itunsigned integer):Low word is AcDbDwgVersionHigh word is MaintenanceReleaseVersion

70 DXF: Original custom object data format:0 = DWG format

1 = DXF format

Arc group codes


100 Subclass marker (AcDbCircle)

39 Thickness (optional; default = 0)

10 Center point (in OCS)DXF™: X value; APP: 3D point

20, 30 DXF: Y and Z values of center point (in OCS)

40 Radius

100 Subclass marker (AcDbArc)

50 Start angle

Acad_proxy_ent ity group codes (continued )


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ATTDEF | 65

ATTDEF

Th e followin g grou p codes ap ply to at tdef (attribute defin ition ) en tities. In

addition to th e grou p codes described h ere, see “Comm on Group Codes for

En tities” on page 60 . For in formation about a bbreviation s and format ting


51 End angle

210 Extrusion direction (opt ional; default = 0, 0, 1)


220, 230 DXF: Y and Z values of extrusion direction (optional)

Attdef group codes


100 Subclass marker (AcDbText)


10 First alignment point (in OCS)DXF: X value; APP: 3D point

20, 30 DXF: Y and Z values of text start point (in OCS)

40 Text height

1 Default value (string)

100 Subclass m arker (AcDbAt tribut eDefinit ion)

50 Text rotat ion (opt ional; default = 0)

41 Relative X scale factor (widt h) (op tional; default = 1). This value is alsoadjusted when fit-type text is used

51 Oblique angle (option al; default = 0)

7 Text style name (optional, default = STANDARD)

Arc group codes (continued )


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If group 72 and/ or 74 values are non zero th en the first alignm ent p oint

values are ignored an d Aut oCAD calculates n ew values based on th e secon d

alignm en t po in t an d th e length an d h eight of th e text strin g itself (after

app lying th e text style). If the 72 an d 74 values are zero or m issing, th en th e

secon d alignm ent point is meanin gless.

ATTRIB

Th e followin g grou p codes app ly to attrib (attribute) en tities. In add ition to

th e group co des described h ere, see “Com m on Group Codes for Entities” on

71 Text generation flags (opt ional, default = 0); see TEXT group codes

72 Horizontal tex t just ification type (opt ional, default = 0); see TEXT group

codes

11 Second alignment point (in OCS) (optional)DXF: X value; APP: 3D pointMeaningful only if 72 or 74 group values are nonzero

21, 31 DXF: Y and Z values of second alignment point (in OCS) (optional)

210 Ext rusion direct ion (optional; default = 0, 0, 1)DXF: X value; APP: 3D vector

220, 230 DXF: Y and Z values of extrusion direction

100 Subclass m arker (AcDbAt tribut eDefinit ion)

3 Prompt string

2 Tag string

70 Attribute flags:1 = Attribut e is invisible (does not appear)2 = This is a constant attrib ute4 = Verification is required on input of this attribute8 = Attr ibute is preset (no prompt during insertion)

73 Field lengt h (optional; default = 0) (not currently used)

74 Ver tical text justificat ion type (optional, default = 0); see group code 73in TEXT

Attdef group codes (continued )


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ATTRIB | 67

page 60. For information about abbreviations an d form atting used in th is


Attr ib group codes




10 Text start point (in OCS)DXF™: X value; APP: 3D point

20, 30 DXF: Y and Z values of text start point (in OCS)

40 Text height

1 Default value (string)

100 Subclass marker (AcDbAttribute)

2 Attribute tag (string)

70 Attribute flags:1 = Attribute is invisible (does not appear)2 = This is a constant attrib ute4 = Verification is required on input of this attribute8 = Attribut e is preset (no prompt during insertion)

73 Field lengt h (optional; default = 0) (not currently used)

50 Text rotat ion (opt ional; default = 0)

41 Relat ive X scale factor (width) (optional; defaul t = 1). This value is alsoadjusted when fit-type text is used

51 Oblique angle (optional; default = 0)

7 Text style name (optional, default = STANDARD)

71 Text generation flags (opt ional, default = 0). See TEXT group codes

72 Horizontal text justificat ion t ype (optional, default = 0). See TEXT groupcodes

74 Ver tical tex t just ification type (opt ional, default = 0) . See group code 73in TEXT

11 Alignment point (in OCS) (opt ional)DXF: X value; APP: 3D pointPresent only if 72 or 74 group is present and nonzero

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If group 72 an d/or 74 values are non zero then th e text in sertion point values

are ign ored, and Aut oCAD calculates n ew values based on th e text alignm ent

poin t an d th e len gth of the t ext strin g itself (after applying th e text style). If

the 72 an d 74 values are zero or m issing, then the text alignm ent po in t is

ignored an d recalculated based on t h e text insertion p oint an d th e length o f

th e text string itself (after ap plying th e text style).

BODY

Th e followin g grou p codes apply to bod y entities. In add ition to th e group




21, 31 DXF: Y and Z values of alignment point (in OCS) (optional)

210 Extrusion direct ion. Present only if the enti ty’s extrusion direct ion is not

parallel to the WCS Z axis (opt ional; default = 0, 0, 1)DXF: X value; APP: 3D vector


Body group codes



70 M odeler format version number (currently = 1)


3 Add it ional lines of p rop rietary data (if p revious g roup 1 string is g reaterthan 255 characters) (optional)

Attrib group codes (continued )


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CIRCLE | 69

CIRCLE

Th e followin g grou p codes app ly to circle entities. In ad dition t o th e group




DIMENSION

Dim ension en tity definition s con sist o f group codes th at are com m on to all

dim en sion t ypes, followed b y codes specific to th e type.

Common Dimension Group Codes

The followin g grou p codes apply to all dim ension en tity types. In add ition

to t h e grou p codes described h ere, see “Com m on Group Cod es for En tities”

Circle group codes


100 Subclass marker (AcDbCircle)


10 Center point (in OCS)DXF™: X value; APP: 3D point

20, 30 DXF: Y and Z values of center point (in OCS)

40 Radius

210 Extrusion direction (opt ional; default = 0, 0, 1)DXF: X value; APP: 3D vector


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on page 60. For information about abbreviations an d formatting used in t h is


Common dimension group codes


100 Subclass marker (AcDbDimension)

2 Nam e of the block that contains t he ent ities that make up thedimension picture

10 Definit ion point (in WCS)DXF: X value; APP: 3D point

20, 30 DXF: Y and Z values of definition point (in WCS)

11 Middle point of dimension text (in OCS)DXF: X value; APP: 3D point

21, 31 DXF: Y and Z values of middle point of dimension text (in OCS)

70 Dimension type.Values 0–6 are integer values that represent the dimension type. Values32, 64, and 128 are bit values, which are added to the integer values(value 32 is always set in R13 and later releases).0 = Rotated, horizontal, or vertical; 1 = Aligned;2 = Angular; 3 = Diameter; 4 = Radius;5 = Angular 3 point; 6 = Ordinate;32 = Ind icates that the block reference (group code 2) is referenced bythis dimension only.64 = Ordinate type. This is a bit value (bit 7) used only with integervalue 6. If set, ordinate is X-type; if not set, ordinate is Y-type.128 = This is a bit value (bit 8) added to the other group 70 values ifthe dimension text has been posit ioned at a user-defined locationrather than at the default location

71 Attachment point :1 = Top left; 2 = Top center; 3 = Top right;4 = Midd le left; 5 = Middle center; 6 = Middle right ;7 = Bott om left; 8 = Bottom center; 9 = Bottom r ight

72 Dimension text line spacing style (opt ional):1 (or missing) = At least (taller characters will override)2 = Exact (taller characters will not override)

41 Dim ension t ext line spacing fact or (opt ional):Percentage of default (3-on-5) line spacing to be applied. Valid valuesrange from 0.25 to 4.00

42 Act ual m easurement (optional; read-only value)

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DIMENSION | 71

Xdata belonging to the application ID " A CA D" follows a d im en sion en tity if

an y dim en sion overrides th at h ave been app lied to th is en tity. See “Dimen-

sion Style Overrides” on page 76 .

For all dimen sion typ es, th e followin g group cod es represen t 3D WCS poin ts:

s (10, 20, 30)

s (13, 23, 33)

s (14, 24, 34)

s (15, 25, 35)

For all dimen sion t ypes, th e followin g group cod es represen t 3D OCS po ints:

s (11, 21, 31)

s (12, 22, 32)

s (16, 26, 36)

Aligned Dimension Group Codes

Th e followin g grou p codes apply to aligned dim en sions. In ad dition t o th e

grou p codes described here, th ose listed in “Comm on Grou p Codes for En ti-

1 Dimension text explicit ly en tered by the user. Opt ional; default is themeasurement. If null or “ <>” , the dimension measurement is drawn asthe text, if “ “ (one blank space), the text is supp ressed. Anything else is

drawn as the text

53 The opt ional g roup code 53 is the rotation ang le of the dimension tex taway from its default orientation (the direction of the dimension line)(optional)

51 All dimension types have an opt ional 51 group code, wh ich ind icatesthe horizontal direction for the dimension entity. The dimension entitydetermines the orientation of dimension text and lines for horizontal,vertical, and rotated linear dimensions.This group value is the negative of the angle between the OCSX axisand the UCS X axis. It is always in the XY plane of the OCS




Common dimension group codes (continued )


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ties” on page 60 an d “Com m on Dimen sion Group Codes” on page 69 can

also be presen t. For inform ation ab out abb reviation s an d format ting used in

th is table, see “Form atting Con ventio ns in This Reference” on page 6.

Th e poin t (13,23,33) specifies th e start poin t o f th e first extension lin e and

th e poin t (14,24,34) specifies the start poin t of the secon d exten sion lin e.

Poin t (10,20,30) specifies the d im ension lin e location . Th e poin t (11,21,31)

specifies th e m idpo in t o f the d im ension text.

Linear and Rotated Dimension Group Codes

Th e followin g group codes apply to linear an d rotated d im ensions (n ote th at

lin ear an d rotated d imen sions are part of th e AcDbAlign edDimen sion sub-

class). In add ition to th e group co des described h ere, th ose listed in “Com-

m on Gro up Codes for En tities” on p age 60 and “Com m on Dimension Group

Codes” on page 69 can also be presen t. For in form ation about abb reviation s

Aligned dimension group codes


100 Subclass m arker (AcDbAlignedDimension)

12 Insert ion poin t for clones of a dimension—Baseline and Cont inue ( inOCS)DXF: X value; APP: 3D point

22, 32 DXF: Y and Z values of insert ion point for clones of a dimension—Baseline and Continue (in OCS)

13 Definit ion point fo r lin ear and an gular d imensions (in WCS)DXF: X value; APP: 3D point

23, 33 DXF: Y and Z values of definition point for linear and angulardimensions (in WCS)

14 Definit ion poin t fo r lin ear and angular d imensions (in WCS)DXF: X value; APP: 3D point


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DIMENSION | 73

an d form atting used in th is table, see “Form attin g Con vent ion s in Th is Ref-

eren ce” on p age 6.

Radial and Diameter Dimension Group Codes

Th e followin g group cod es app ly to radial an d d iam eter dim ension s. In ad di-

tion to th e grou p codes described h ere, th ose listed in “Comm on Group

Cod es for En tities” on page 60 an d “Comm on Dim ension Group Codes” on

page 69 can also be present. For in formation a bout abb reviation s an d form at-

Linear and rotated dimension group codes


100 Subclass m arker (AcDbAlignedDimension)

12 Insert ion poin t for clones of a dimension—Baseline and Cont inue (inOCS)DXF: X value; APP: 3D point

22, 32 DXF: Y and Z values of insertion point for clones of a dimension—Baseline and Continue (in OCS)

13 Definit ion poin t fo r lin ear and an gular d imensions (in WCS)DXF: X value; APP: 3D point




50 Angle of rot ated, horizontal, or vertical dimensions

52 Linear dimension types with an oblique angle have an opt ional g roupcode 52. When added to the rotation angle of the linear dimension

(group code 50), it gives the angle of the extension lines

100 Subclass m arker (AcDbRot atedDimension)

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page 6.

Th e point (15,25,35) specifies the first po in t of th e dim ension line o n t he cir-

cle/arc an d th e poin t (10,20,30) specifies th e poin t opp osite th e first poin t.

Th e point (11,21,31) specifies th e m idp oin t of the dim ension t ext.

Th e point (15,25,35) specifies the first po in t of th e dim ension line o n t he cir-

cle/arc an d th e po int (10,20,30) specifies th e cent er of th e circle/arc. The

point (11,21,31) specifies the midpoint of the dimension text.

Angular Dimension Group Codes

The following group codes apply to angular dimensions. In addition to the


ties” on page 60 an d “Com m on Dimen sion Group Codes” on page 69 canalso be presen t. For inform ation ab out abb reviation s an d format ting used in


Radial and diameter dimension group codes


100 Subclass marker (AcDbRadialDimension or AcDbDiametricDimension)

15 Defin it ion poin t for diameter , rad ius, and angular dimensions (in WCS)DXF: X value; APP: 3D point

25, 35 DXF: Y and Z values of definition point for diameter, radius, andangular dimensions (in WCS)

40 Leader lengt h for radius and diam eter dimensions

Angular dimension group codes


100 Sub class m arker (AcDb3Point AngularDimension)




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DIMENSION | 75

Th e poin ts (13,23,33) an d (14,24,34) specify th e en dp oin ts of th e lin e usedto d etermin e th e first exten sion lin e. Point s (10,20,30) and (15,25,35) specify

the en dpo in ts of the line used to determin e the second ex tension line. Point

(16,26,36) specifies th e location of the dim en sion line arc. Th e poin t

(11,21,31) specifies the midpoint of the dimension text.

Th e poin t (15,25,35) specifies th e vertex of th e an gle. Th e poin ts (13,23,33)

an d (14,24,34) specify th e end poin ts of the exten sion lines. Th e point

(10,20,30) specifies th e location of the dim en sion line arc an d th e poin t

(11,21,31) specifies the midpoint of the dimension text.

Ordinate Dimension Group CodesTh e following group codes apply to ordinate dim ension s. In add ition to t h e


ties” on page 60 an d “Com m on Dimen sion Group Codes” on page 69 can

also be presen t. For inform ation ab out abb reviation s an d format ting used in

th is table, see “Form atting Con ventio ns in Th is Reference” on page 6.


15 Defin it ion poin t for d iameter, rad ius, and angular dimensions ( in WCS)DXF: X value; APP: 3D point

25, 35 DXF: Y and Z values of definition point for diameter, radius, andangular dimensions (in WCS)

16 Po in t defining dimension arc for angular d imensions (in OCS)DXF: X value; APP: 3D point

26, 36 DXF: Y and Z values of point defining dimension arc for angulardimensions (in OCS)

Ordinate dimension group codes


100 Subclass m arker (AcDbOrdinat eDimension)

13 Definit ion poin t fo r lin ear and an gular d imensions (in WCS)DXF: X value; APP: 3D point

Angular dimension group codes (continued )


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Th e poin t (13,23,33) specifies th e feature location an d t h e poin t (14,24,34)

specifies th e leader end poin t. The poin t (11,21,31) specifies the m idpoin t of

th e dim en sion text. Point (10,20,30) is placed at th e origin o f th e UCS th at is

current when the d imen sion is created.

Dimension Style Overrides

Dim en sion style overrides can be app lied to dim en sion , leader, an d tolerance

ent ities. An y overrides applied to th ese en tities are stored in th e en tity as

xdata. Th e overridd en d imen sion variable grou p codes an d th e related values

are con tained with in group 1002 con trol strings. Th e followin g exam ple

sh ows th e xdata of a dimension entity wh ere the DIMTOL an d DIMCLRE vari-

ables have been overridden.

( s e t q d i me n t ( c a r ( e n t s e l ) ) ) ; Se l e c t d i me n s i o n e n t i t y( s e t q e l s t ( e n t g e t d i me n t ' ( " A CA D" ) ) ) ; Ge t e n t i t y d e f i n i t i o n l i s t( a s s o c - 3 e l s t ) ; Ex t r a c t x d a t a o n l y

Th is cod e return s the following:

( - 3 ( " AC AD " S t a r t o f t h e AC AD AP P I D s e c t i o n o f x d a t a( 1 0 0 0 . " DS T YL E" ) ( 1 0 0 2 . " { " ) B e g i n n i n g o f t h e d i ms t y l e s u b s e c t i o n( 1 0 7 0 . 1 7 7 ) ( 1 0 7 0 . 3 ) T h e D I MCL RE ( c o d e 1 7 7 ) o v e r r i d e + v a l u e ( 3 )( 1 0 7 0 . 7 1 ) ( 1 0 7 0 . 1 ) T h e D I MT OL ( c o d e 7 1 ) o v e r r i d e + v a l u e ( 1 )( 1 0 0 2 . " } " ) ) ) E n d d i ms t y l e s u bs e c t i o n a n d A CA D s e c t i o n

ELLIPSE

Th e followin g group codes apply to ellipse ent ities. In addition to th e grou p





Ordinate dimension group codes (continued )


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ELLIPSE | 77



The group codes 41 an d 42 are th e start an d en d values for u in the equation

describin g th e Param eter option of the ELLIPSE comm and (see th e followin g

topic, “ELLIPSE Com m an d’s Param eter O ption ”). Th e m agnitude of the

codes 11,21,31 vector is equal to 1 /2 of th e m ajor axis wh ich is the a value in

the equation. Th e poin t 10,20,30 is the c value in th e equation . Kn owing all

th ese, we can calculate th e b value to complete the equat ion .

ELLIPSE Command’s Parameter Option

Th e Parameter option o f th e ELLIPSE com m and uses th e followin g equation

to d efin e an ellipt ical arc.

p ( u ) = c +a * c o s ( u ) + b * s i n ( u )

The variables a, b, c are determined wh en you select th e endpoint s for th e

first axis an d t he d istan ce for th e second axis. a is th e n egative of 1/2 of th e

Ellipse group codes


100 Subclass marker (AcDbEllipse)

10 Center point (in WCS)DXF: X value; APP: 3D point

20, 30 DXF: Y and Z values of center point (in WCS)

11 Endpoint of major axis, relat ive t o the cent er (in WCS)DXF: X value; APP: 3D point

21, 31 DXF: Y and Z values of endpoint of major axis, relative to the center (inWCS)



40 Ratio of minor axis to major axis

41 St art p aram eter (t his value is 0.0 for a full ellip se)

42 End param eter (t his value is 2pi for a full ellipse)

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m ajor axis len gth , b is th e n egative of 1/2 the m in or axis length , and c is th e

cen ter p oint (2-D) of th e ellipse.

Becau se th is is actua lly a vecto r equation an d t he variable c is actu ally a po int

with X an d Y values, it really sh ould be written as:

p ( u ) = ( C x + a * c o s ( u ) ) * i + ( C y + b * s i n ( u ) ) * j

where

s Cx is the X value of th e point c

s Cy is th e Y value of th e point c

s a is –(1/ 2 of th e m ajor axis len gth)

s b is –(1/2 of th e m in or axis len gth)

s i and j represent un it vectors in the X an d Y directions

In Aut oCAD, on ce th e axis endp oint s are selected, all you h ave left to specify

is the start an d en d o f th e ellipt ical arc.

Wh en you select th e parameter opt ion , you are asked for a start param eter

and an end parameter. Th ese values are plugged in to th e equation to deter-

m in e th e actual start an d en d p oints on th e ellipse. Th e rest of th e ellipse is

filled in between t h ese two poin ts in a coun terclockwise direction from th e

first parameter to th e second. Th e value entered for the parameter u is taken

to be d egrees for th e purp oses of obtainin g the cos(u) an d sin (u).

For exam ple:

Axis en dp oint 1 = 0,1

Axis en dp oint 2 = 4,1

Oth er axis distan ce = 2,0

Start param eter = 270En d param eter = 0

generates the start p oint at 2,2 an d th e end p oint at 0,1 an d fills in the ellipse

from 2,2 to 0,1 in a coun terclockwise direction .

HATCH

Th e followin g group codes apply to h atch entities. In addition to the grou p


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HATCH | 79



Hatch group codes


100 Subclass marker (AcDbHatch)

10 Elevat ion point (in OCS)DXF: X value = 0; APP: 3D point (X and Y always equal 0, Z representsthe elevation)

20, 30 DXF: Y and Z values of elevation point (in OCS)Y value = 0, Z represents the elevation


220, 230 DXF: Y and Z values of extrusion d irection

2 Hatch pattern name

70 Solid fill flag (solid fill = 1; pattern fill = 0)

71 Associativity flag (associative = 1; non-associat ive = 0)

91 Number of boundary paths (loops)

varies Boundary path data. Repeats number of times specified by code 91.See “ Boundary Path Data” on page 80

75 Hatch style:0 = Hatch “ odd parity” area (Normal style)1 = Hatch out ermost area only (Outer style)2 = Hatch through entire area (Ignore style)

76 Hatch pattern type:0 = User-defined; 1 = Predefined; 2 = Custom

52 Hatch pattern angle (pattern fill only)

41 Hatch patt ern scale or spacing (pattern fill only)

77 Hatch pattern double flag (pattern fill only):

0 = not double; 1 = double

78 Number of pattern definit ion lines

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Boundary Path DataTh e boun dary of each hatch object is defined by a path (or loop) tha t consists

of one or m ore segm ent s. Path segmen t data varies depen ding on th e en tity

type (or types) that m ake up th e path. Each p ath segm ent is defined by its

own set of group codes. For information about abbreviations and form atting

used in t h is table, see “Form att in g Con ven tions in This Reference” on page

6.

varies Pattern line data. Repeats number of times specified by code 78. See“ Pattern Data” on page 83

47 Pixel size used to determine the density to per form various intersect ionand ray cast ing operations in hatch pattern computation for associativehatches and hatches created with the Flood method of hatching

98 Number of seed points

10 Seed point (in OCS)DXF: X value; APP: 2D poin t (multiple entries)

20 DXF: Y value of seed point (in OCS); (mult iple entries)

Hatch boundary path data group codes


92 Boundary path type flag (bit coded):0 = Default; 1 = External; 2 = Polyline;4 = Derived; 8 = Textbox; 16 = Outermost

varies Polyline bound ary typ e data (only if boundary = polyline). See Polylineboundary data table below

93 Num ber o f ed ges in this b oundary path (only if bou ndary is n ot apolyline)

72 Edge type (only if boundary is not a polyline):1 = Line; 2 = Circular arc; 3 = Elliptic arc; 4 = Spline

varies Edge type data (only if boundary is not a polyline). See appropriateEdge data table below

97 Number of source boundary objects

Hatch group codes (continued )


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HATCH | 81

330 Reference to source boundary objects (multip le en tries)

Polyline boundary data group codes


72 Has bulge flag

73 Is closed flag

93 Number of polyline vertices

10 Vertex locat ion (in OCS)DXF: X value; APP: 2D poin t (multiple entries)

20 DXF: Y value of vertex location (in OCS) (mult iple entries)

42 Bulge (opt ional, default = 0)

Line edge data group codes


10 Start point (in OCS)DXF: X value; APP: 2D point

20 DXF: Y value of start point (in OCS)

11 End point (in OCS)DXF: X value; APP: 2D point

21 DXF: Y value of end point (in OCS)

Arc edge data group codes


10 Center point (in OCS)


20 DXF: Y value of center point (in OCS)

40 Radius

Hatch boundary path data group codes (continued )


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IMAGE | 83

Pattern Data

The followin g pat tern d ata codes repeat for each patt ern definition lin e. For


matting Conventions in This Reference” on page 6.

IMAGE

Th e followin g group codes app ly to im age ent ities. In add ition to th e grou p


10 Control point (in OCS)DXF: X value; APP: 2D point

20 DXF: Y value of control point (in OCS)

42 Weights (opt ional, default = 1)

Hatch pattern data group codes


53 Pattern line angle

43 Pattern line base point, X component

44 Pattern line base point, Y component

45 Pattern line offset, X component

46 Pattern line offset, Y component

79 Number of dash length items

49 Dash length (multiple entries)

Spline edge data group codes (continued )


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Image group codes


100 Subclass m arker (AcDbRasterImage)

90 Class version

10 Insert ion point (in WCS)DXF: X value; APP: 3D point

20, 30 DXF: Y and Z values of insertion point (in WCS)

11 U-vector o f a single pixel (points along the visual bot tom of the image,starting at the insertion point) (in WCS)DXF: X value; APP: 3D point

21, 31 DXF: Y and Z values U-vector (in WCS)

12 V-vector of a sing le p ixel (po in ts along the visual lef t side of the image,starting at the insertion point) (in WCS)DXF: X value; APP: 3D point

22, 32 DXF: Y and Z values of V-vector (in WCS)

13 Image size in pixelsDXF: U value; APP: 2D point (U and V values)

23 DXF: V value of image size in pixels

340 Hard reference to imagedef object

70 Image display propert ies:1 = Show image2 = Show image when not aligned with screen4 = Use clipping boundary8 = Transparency is on

280 Clipping state: 0 = Off, 1 = On

281 Brightness value (0-100; default = 50)

282 Contrast value (0-100; default = 50)

283 Fade value (0-100; default = 0)

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INSERT | 85

INSERT

Th e followin g grou p cod es apply to insert (block reference) ent ities. In ad di-

tion t o th e group codes described h ere, see “Com m on G roup Codes for En ti-

ties” on page 60. For informat ion about ab breviations and form atting used

in th is table, see “Form att ing Con ven tion s in Th is Referen ce” on page 6 .

360 Hard reference to imagedef_react or object

71 Clipping boundary type. 1 = Rect angular, 2 = Polygonal

91 Number of clip boundary vertices that follow

14 Clip boundary vertex (in OCS)DXF: X value; APP: 2D poin t (multiple entries)Notes:1) For rectangular clip boundary type, two opposite corners must bespecified. Default is (–0.5,–0.5), (size.x–0.5, size.y–0.5).2) For polygonal clip boundary type, three or more vertices must bespecified. Polygonal vertices must be listed sequentially

24 DXF: Y value of clip boundary vertex (in OCS) (multiple entries)

Insert group codes


100 Subclass m arker (AcDbBlockReference)

66 Var iable att ributes-follow flag (optional; default = 0); if the value ofattrib utes-follow flag is 1, a series of attr ibute entit ies is expected tofollow t he insert, terminated by a seqend entit y

2 Block name

10 Insert ion point (in OCS)DXF: X value; APP: 3D point

20, 30 DXF: Y and Z values of insertion poin t (in OCS)

41 X scale factor (optional; default = 1)

Image group codes (continued )


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LEADER | 87

Xdata belonging to the application ID " A CA D" follows a leader en tity if any

dimen sion o verrides ha ve been app lied to t h is en tity. See “Dim en sion Style

Overrides” on page 76.

74 Hook line direction flag:0 = Hook line (or end of tangent for a splined leader) is the oppositedirection from the horizontal vector

1 = Hook line (or end of tangent for a splined leader) is the samedirection as horizontal vector (see code 75)

75 Hook line flag: 0 = No hookline; 1 = Has a hookline

40 Text annotat ion height

41 Text annotat ion width

76 Num ber of vertices in leader (ignored for OPEN)

10 Vert ex coordinates (one entry for each vertex)DXF: X value; APP: 3D point

20, 30 DXF: Y and Z values of vertex coordinates

77 Color to use if leader’s DIMCLRD = BYBLOCK

340 Hard reference to associated annotat ion (mtext, tolerance, or insertentity)

210 Normal vectorDXF: X value; APP: 3D vector

220, 230 DXF: Y and Z values of normal vector

211 “ Horizontal” direction for leader


221, 231 DXF: Y and Z values of “ horizontal” direction for leader

212 Offset o f last leader vertex from b lock reference insert ion po in tDXF: X value; APP: 3D vector

222, 232 DXF: Y and Z values of offset

213 Offset of last leader vertex from annotat ion placement po in tDXF: X value; APP: 3D vector

223, 233 DXF: Y and Z values of offset

Leader group codes (continued )


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LINE

Th e followin g grou p codes apply to lin e entities. In add ition to th e group




LW POLYLINE

Th e followin g grou p codes apply to lwpolylin e entities. In add ition to th e

grou p codes described h ere, see “Comm on Group Co des for En tities” on page

60 . For information about ab breviations and formatting u sed in t h is table,

see “Form attin g Conven tion s in Th is Referen ce” on page 6.

Line group codes


100 Subclass marker (AcDbLine)


10 Start point (in WCS)DXF: X value; APP: 3D point

20, 30 DXF: Y and Z values of start point (in WCS)

11 End point (in WCS)DXF: X value; APP: 3D point

21, 31 DXF: Y and Z values of end point (in WCS)



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MLINE | 89

MLINE

Th e followin g grou p codes ap ply to m line en tities. In a ddition to th e grou p

codes described here, see “Com m on Group Cod es for En tities” on p age 60.For inform ation about abbreviation s and form atting u sed in th is table, see


Lwpolyline group codes


100 Subclass marker (AcDbPolyline)

90 Number of vert ices

70 Polyline flag (bit -coded); default is 0:1 = Closed; 128 = Plinegen

43 Constant width (optional; default = 0). Not used if variable width(codes 40 and/ or 41) is set

38 Elevation (opt ional; default = 0)


10 Ver tex coord inates ( in OCS), mult iple ent ries; one entry for each ver texDXF: X value; APP: 2D point

20 DXF: Y value of vertex coordinates (in OCS), mult iple entries; one entryfor each vertex

40 Starting width (mult iple entries; one entry for each vertex) (opt ional;default = 0; m ultiple entries). Not used if constant widt h (code 43) isset

41 End width (mult iple entries; one entry for each vertex) (option al;default = 0; m ultiple entries). Not used if constant widt h (code 43) isset

42 Bulge (multiple entries; one entry for each vertex) (opt ional; default =

0)



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Mline group codes


100 Subclass marker (AcDbMline)

2 St ring of up to 32 characters. The name of the style used for this mline.

An entry for this style must exist in the MLINESTYLE dictionary.

NOTE Do not modify this field without also updating the associatedentry in the MLINESTYLE dictionary

340 Pointer-handle/ ID of MLIN ESTYLE object

40 Scale factor

70 Justificat ion: 0 = Top, 1 = Zero, 2 = Bottom

71 Flags (bit-coded values):1 = Has at least one vertex (code 72 is greater than 0);2 = Closed;4 = Suppress start caps; 8 = Suppress end caps

72 Number of vert ices

73 Num ber of elements in M LINESTYLE definit ion



210 Ext rusion direct ion (optional; default = 0, 0, 1)



11 Ver tex coord inates (mult ip le ent ries; one ent ry for each vertex) DXF: X value; APP: 3D point

21, 31 DXF: Y and Z values of vertex coordinates

12 Direct ion vector of segment start ing at this vertex (mult iple ent ries; onefor each vertex)DXF: X value; APP: 3D vector

22, 32 DXF: Y and Z values of direction vector of segment starting at thisvertex

13 Direct ion vector of miter at this ver tex (mult iple ent ries: one for eachvertex)DXF: X value; APP: 3D vector

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MLINE | 91

Th e grou p code 4 1 param eterization is a list of real values, on e real per group

code 41. Th e list m ay con tain zero or m ore item s. Th e first group cod e 41

value is the distance from th e segment vertex alon g the m iter vector to th epoint where th e lin e elem ent ’s path intersects the m iter vector. The next

group code 41 value is the d istan ce alon g the line element’s path from th e

point d efined by th e first group 41 t o th e actual start of th e lin e elem ent . Th e

n ext is the distan ce from th e start of the line elemen t to th e first break (or

cut) in th e lin e elemen t. Th e successive group code 4 1 values con tinu e to list

the start an d stop points of the line elem ent in this segm ent of the mline.

Linetyp es do n ot affect group 41 lists.

The group co de 42 param eterization is also a list of real values. Sim ilar to t he

41 param eterization , it describes th e param eterization of th e fill area for this

m lin e segm ent . The values are in terpreted iden tically to the 41 param eters

and when taken as a who le for all line elem ents in th e m line segmen t, th eydefin e th e boun dary of the fill area for th e m line segm ent .

A comm on exam ple of th e use of the group code 42 m ech anism is wh en an

un filled m lin e crosses over a filled m lin e and m ledit is used t o cause th e filled

m lin e to appear u nfilled in th e crossin g area. Th is would result in two group

42s for each lin e elem en t in th e affected m lin e segm en t, on e for th e fill stop

and one for th e fill start.

The 2 group cod es in m line en tities an d m lin estyle objects are redu n dan t

fields. These grou ps sh ou ld no t be m od ified un der an y circum stances,

alth ou gh it is safe to read th em an d u se their values. Th e correct fields to

m odify are as follows:

Mline Th e 340 group in th e same o bject, wh ich in dicates th e

proper MLINESTYLE object.

23, 33 DXF: Y and Z values of direction vector of miter

74 Number o f parameters for this element (repeats for each element in

segment)

41 Element parameters (rep eats b ased on previous cod e 74)

75 Number o f area fill parameters for this element (repeats for eachelement in segment)

42 Area fill paramet ers (rep eat s based on previou s code 7 5)

Mline group codes (continued )


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Mlinestyle The 3 group value in th e MLINESTYLE diction ary

which precedes the 350 group th at h as th e han dle or

entity nam e of the current m lin estyle.

MTEXT

Th e followin g grou p codes app ly to m text en tities. In ad dition to t h e grou p




Mtext group codes


100 Subclass marker (AcDbMText)

10 Insert ion pointDXF: X value; APP: 3D point

20, 30 DXF: Y and Z values of insert ion point

40 Nominal (initial) text height

41 Reference rectangle width

71 Attachment point :1 = Top left; 2 = Top center; 3 = Top right;

4 = Midd le left; 5 = Middle center; 6 = Mid dle right ;7 = Bott om left; 8 = Bottom center; 9 = Bottom r ight

72 Drawing direct ion:1 = Left to right;3 = Top to bottom ;5 = By style (the flow direction is inherited from the associated textstyle)

1 Text st ring. If the text str ing is less than 250 characters, all charactersappear in group 1. If the text string is greater than 250 characters, thestring is divided into 250 character chunks, which appear in one ormore group 3 codes. If group 3 codes are used, the last group is agroup 1 and has fewer than 250 characters

3 Addit ional text (alw ays in 250 charact er chunks) (opt ional)

7 Text st yle name (STAN DARD if not provided) (optional)

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OLEFRAME | 93

Xdata with t h e " DC O1 5 " app lication ID m ay follow an m text ent ity. Th is con -

tain s inform ation related to th e dbCon n ect feature.

OLEFRAME

Th e followin g grou p codes apply to olefram e ent ities. In add ition to th e


60 . For informat ion about ab breviations and formatting u sed in t h is table,




11 X -axis direction vector (in WCS)DXF: X value; APP: 3D vector

NOTE A group code 50 (rotation angle in radians) passed as DXFinput is converted to the equivalent direction vector (if both a code 50and codes 11, 21, 31 are passed, the last one wins). This is provided asa convenience for conversions from text objects

21, 31 DXF: Y and Z values of X -axis direction vector (in WCS)

42 Horizontal w id th o f the characters that make up the mtext entit y. Thisvalue will always be equal to or less than the value of group code 41

(read-only, ignored if supplied)

43 Vert ical heigh t of the mtext en tity (read-on ly, ignored if supplied )

50 Rotat ion angle in radians

73 Mtext line spacing style (opt ional):1 = At least (t aller characters will override)2 = Exact (taller characters will not override)

44 Mtext line spacing factor (optional):Percentage of default (3-on-5) line spacing to be applied. Valid valuesrange from 0.25 to 4.00

Mtext group codes (continued )


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OLE2FRAME

Th e followin g grou p codes app ly to ole2fram e en tities. Th is in form ation is

read-only. During OPEN , th e values are ign ored because th ey are part of th e

OLE binary ob ject, an d are obtain ed via access fun ctions. In add ition to th e


60 . For information about ab breviations and formatting u sed in t h is table,


Oleframe group codes


100 Subclass marker (AcDbOleFrame)

70 OLE version number

90 Length of binary data

310 Binary data (multiple lines)

1 End of OLE data (the string “ OLE” )

Ole2frame group codes


100 Subclass marker (AcDbOle2Frame)

70 OLE version number


10 Upper left corner (WCS)DXF: X value; APP: 3D point

20, 30 DXF: Y and Z values of upper left corner (in WCS)

11 Lower right corner (WCS)DXF: X value; APP: 3D point

21, 31 DXF: Y and Z values of low er right corner (in WCS)

71 OLE object t ype, 1 = Link, 2 = Embedded, 3 = Stat ic

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OLE2FRAME | 95

Sam ple DXF outp ut :

O L E 2 F R A M E5

2 D

1 0 0A c Db En t i t y6 7

18

01 0 0A c Db Ol e 2 F r a me

7 02

3P a i n t b r u s h P i c t u r e

1 04 . 4 3 1 1 6

2 05 . 6 6 5 9 9 23 0

0 . 01 1

6 . 4 1 8 82 1

4 . 2 4 4 9 3 93 1

0 . 07 1

27 2

1

9 0 2 3 6 8 03 1 0

0 1 5 5 7 6 4 B D6 0 0 8 2 B 9 1 1 4 0 1 1 4 B 0 8 C 8 F 9 A 9 1 6 4 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 5 0 6 D C0 D 0 D9 A C

3 1 0

72 Tile mode descriptor:0 = Object resides in model space1 = Object resides in paper space


310 Binary data (multiple lines)

1 End of OLE data (the string “ OLE” )

Ole2frame group codes (continued )


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1 9 4 0 1 1 4 B 0 8 C 8 F 9 A9 1 6 4 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 5 0 6 DC0 D 0 D9 A C1 9 4 0 0 2 3 0 3 E 5 CD 1 FA

3 1 0 1 0 4 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 7 6 4 B D 6 0 0 8 2 B 9 1 1 4 0 0 2 3 0 3 E 5 C D 1 F A 1 0 4 0 0 0 0 0 0 0 0 0 0 0 0 0

. . .

. . .

AutoLISP e n t n e x t fun ction samp le outpu t:

Co mma n d : ( s e t q e ( e n t g e t e 3 ) )( ( - 1 . < E n t i t y n a me : 7 d 5 0 4 2 8 > ) ( 0 . " OL E2 F RA ME " ) ( 5 . " 2 D " )( 1 0 0 . " Ac D b E n t i t y " ) ( 6 7 . 1 ) ( 8 . " 0 " ) ( 1 0 0 . " A c Db Ol e 2 F r a me " )( 7 0 . 2 ) ( 3 " P a i n t b r u s h P i c t u r e " ) ( 1 0 4 . 4 3 1 1 6 5 . 6 6 5 9 9 0 . 0 )( 1 1 6 . 4 1 8 8 4 . 2 4 4 9 4 0 . 0 ) ( 7 1 . 2 ) ( 7 2 . 1 ) )

POINT

Th e followin g grou p codes apply to p oint ent ities. In ad dition to t h e grou p

codes described here, see “Com m on Group Cod es for En tities” on p age 60.For in form ation ab out abbreviation s an d form attin g used in t h is table, see


Point group codes


100 Subclass marker (AcDbPoint)

10 Point locat ion (in WCS)DXF: X value; APP: 3D point

20, 30 DXF: Y and Z values of point location (in WCS)




50 Angle of the X axis for t he UCS in effect when the point was drawn(opt ional, default = 0); used when PDMODE is nonzero

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POLYLINE | 97

POLYLINE

Th e followin g grou p codes app ly to polyline en tities. In add ition to th e




Polyline group codes


100 Subclass marker (AcDb2dPolyline or AcDb3dPolyline)

66 Obsolete; former ly an “ent ities follow flag” (opt ional; ignore if present )

10 DXF: always 0APP: a “ dummy” point ; the X and Y values are always 0, and the Z value

is the polyline’s elevation (in OCS when 2D, WCS when 3D)

20 DXF: always 0

30 DXF: polyline’ s elevat ion (in OCS wh en 2D, WCS w hen 3D)


70 Polyline flag (bit -coded); default is 0:1 = This is a closed polyline (or a p olygon mesh closed in the Mdirection)2 = Curve-fit vertices have been added4 = Spline-fit vertices have been added

8 = This is a 3D polyline16 = This is a 3D polygon mesh32 = The polygon mesh is closed in the N direction64 = The polyline is a polyface mesh128 = The linetype pattern is generated continuously around thevertices of this polyline

40 Default start width (opt ional; default = 0)

41 Default end width (optional; default = 0)

71 Polygon mesh M vert ex count (optional; default = 0)

72 Polygon mesh N vert ex count (opt ional; default = 0)

73 Smooth surface M density (opt ional; default = 0)

74 Smooth surface N densit y (optional; default = 0)

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Xdata with th e " A UT O CA D_ P OS T S C RI P T _ F I G UR E " ap plication ID may follow a

polylin e en tity. Th is con tains inform ation related to PostScript ima ges and

PostScript fill information.

Polyface Meshes

A po lyface m esh is represen ted in DXF as a varian t o f a polylin e ent ity. Th e

polylin e header is ident ified as intro du cin g a polyface m esh b y the p resence

of the 64 bit in th e polylin e flags (70) grou p. The 71 group specifies th e n um -

ber of vertices in th e m esh , and th e 72 group specifies th e num ber of faces.

Altho ugh th ese coun ts are correct for all meshes created with t h e PFACE com-

m an d, applications are no t required to p lace correct values in th ese fields.

Followin g th e po lyline h eader is a sequ en ce of vertex en tities th at specify th e

vertex coordinates, then followed by faces that compose the mesh.

Th e AutoCAD entity struct ure imp oses a limit on th e nu m ber of vertices th at

a given face en tity can specify. You can represent m ore com plex po lygons by

decom posin g th em in to t rian gular wedges. Th eir edges should b e m ade invis-

ible to prevent visible artifacts of th is sub division from being d rawn. Th e

PFACE comm and performs th is subd ivision autom atically, but when applica-

tions generate po lyface meshes directly, the app lication s mu st do th is

th em selves. Th e n um ber of vertices per face is th e key param eter in th is sub -

division process. The PFACEVMAX system variable provides an app lication

with th e n um ber of vertices per face en tity. This value is read-on ly and is set

to 4.

Polyface m eshes created with t h e PFACE com m and are always generated with

all th e vertex coordinat e ent ities first, followed by th e face definition ent ities.

Th e cod e within Aut oCAD th at p rocesses polyface m esh es requires th is

75 Curves and smooth sur face type (opt ional; default = 0) ; integer codes,not bit-coded:0 = No smooth surface fitted

5 = Quadratic B-spline surface6 = Cubic B-spline surface8 = Bezier surface



Polyline group codes (continued )


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RAY | 99

ordering. Program s th at generat e polyface m esh es in DXF sh ou ld gen erate all

th e vertices th en all th e faces. However, program s th at read po lyface m esh es

from DXF sh ou ld be tolerant of odd vertex an d face orderin g.

RAY

Th e followin g grou p codes apply to ray entit ies. In add ition to th e group




REGION

Th e following group codes apply to region entities. In add ition to th e grou p




Ray group codes


100 Subclass marker (AcDbRay)



11 Unit direction vector (in WCS)DXF: X value; APP: 3D vector

21, 31 DXF: Y and Z values of unit direction vector (in WCS)

Region group codes



70 Modeler format version number (currently = 1)

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SEQEND

Th e followin g group codes app ly to seqen d en tities. In a ddition to th e group




SHAPE

Th e followin g grou p codes apply to shap e entit ies. In add ition to th e group





3 Addit ional lines of proprietary data (if previous group 1 string is greater

than 255 characters) (optional)

Seqend group codes


–2 APP: name of ent ity that began the sequence. This ent ity marks the endof vertex (vertex type name) for a polyline, or the end of att ributeentities (attrib type name) for an insert entity that has attributes(indicated) by 66 group present and nonzero in insert entity). This codeis not saved in a DXF file

Shape group codes


100 Subclass marker (AcDbShape)



Region group codes (continued )


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SOLID | 101

SOLID

The followin g grou p codes app ly to solid entities. In ad dition t o th e group





40 Size

2 Shape name

50 Rotat ion angle (optional; default = 0)

41 Relative X scale fact or (opt ional; default = 1)

51 Oblique angle (optional; default = 0)


220, 230 DXF:Y

andZ

values of extrusion direction (optional)

Solid group codes


100 Subclass marker (AcDbTrace)

10 First cornerDXF: X value; APP: 3D point

20, 30 DXF: Y and Z values of first corner

11 Second cornerDXF: X value; APP: 3D point

21, 31 DXF: Y and Z values of second corner

12 Third cornerXF: X value; APP: 3D point

Shape group codes (continued )


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SPLINE

Th e following group codes app ly to spline en tities. In ad dition t o th e grou p




22, 32 DXF: Y and Z values of third corner

13 Fourth corner. I f only three corners are entered to def ine the SOLID,

then the fourth corner coordinate is the same as the third.DXF: X value; APP: 3D point

23, 33 DXF: Y and Z values of four th corner




Spline group codes


100 Subclass marker (AcDbSpline)

210 Normal vect or (omit ted if t he spline is nonplanar)DXF: X value; APP: 3D vector

220, 230 DXF: Y and Z values of normal vector (optional)

70 Spline flag (bit coded):1 = Closed spline2 = Periodic spline4 = Rational spline8 = Planar

16 = Linear (planar bit is also set)

71 Degree of the spline curve

Solid group codes (continued )


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TEXT | 103

TEXT

Th e followin g grou p codes apply to text en tities. In addition to th e group


72 Number of knots

73 Number of control points

74 Number of fit points (if any)

42 Knot tolerance (default = 0.0000001)

43 Control-point tolerance (default = 0.0000001)

44 Fit tolerance (default = 0.0000000001)

12 Start tangent—may be omitted (in WCS)DXF: X value; APP: 3D point

22, 32 DXF:Y

andZ

values of start tangent—may be omitted (in WCS)

13 End tangent—may be omitted (in WCS)DXF: X value; APP: 3D point

23, 33 DXF: Y and Z values of end tangent—may be omitt ed (in WCS)

40 Knot value (one entry per knot)

41 Weigh t (if not 1); w ith mult ip le group pairs, are presen t if all are not 1

10 Cont rol points (in WCS), one ent ry per control pointDXF: X value; APP: 3D point

20, 30 DXF: Y and Z values of control points (in WCS), one entry per controlpoint

11 Fit points (in WCS), one entry per fit pointDXF: X value; APP: 3D point

21, 31 DXF: Y and Z values of fit points (in WCS), one entry per fit point

Spline group codes (continued )


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TOLERANCE | 105

Th e followin g table describes th e group codes 72 (h orizont al align m ent ) and

73 (vertical align m en t) in greater deta il.

If group 72 and/ or 73 values are non zero th en the first alignm ent p oint val-

ues are ign ored an d Aut oCAD calculates new values based on th e secon d

alignm en t po in t an d th e length an d h eight of th e text strin g itself (after

app lying th e text style). If the 72 an d 73 values are zero or m issing, th en th e

second alignm ent point is meanin gless.

TOLERANCE

Th e followin g grou p codes app ly to tolerance en tities. In addition to t he


60 . For informat ion about ab breviations and formatting u sed in t h is table,see “Form attin g Conven tion s in Th is Referen ce” on page 6.



73 Ver tical text just ification type (optional, defau lt = 0) : in teger codes (notbit-coded):0 = Baseline; 1 = Bott om; 2 = Middle; 3 = TopSee the Group 72 and 73 integer codes table for clarification

Group 72 and 73 integer codes

Group 73 Group 720 1 2 3 4 5

3 (top) TLeft TCenter TRight

2 (middle) MLeft MCenter MRight

1 (bottom) BLeft BCenter BRight

0 (baseline) Left Center Right Aligned Middle Fit

Text group codes (continued )


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TRACE

Th e followin g grou p codes apply to trace ent ities. In add ition to th e group


For in form ation ab out abbreviation s an d form attin g used in t h is table, see“Form atting Con ventio n s in This Reference” on page 6.

Tolerance group codes


100 Subclass marker (AcDbFcf)




1 St ring rep resent in g th e visual rep resent ation of th e t olerance



11 X-axis direct ion vector (in WCS)DXF: X value; APP: 3D vector

21, 31 DXF: Y and Z values of X-axis direction vector (in WCS)

Trace group codes


100 Subclass marker (AcDbTrace)

10 First corner (in OCS)DXF: X value; APP: 3D point

20, 30 DXF: Y and Z values of first corner (in OCS)

11 Second corner (in OCS)DXF: X value; APP: 3D point

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VERTEX | 107

VERTEX

The followin g group co des apply to vertex en tities. In addition to th e grou p




21, 31 DXF: Y and Z values of second corner (in OCS)

12 Third corner (in OCS)


22, 32 DXF: Y and Z values of third corner (in OCS)

13 Fourth corner (in OCS)DXF: X value; APP: 3D point

23, 33 DXF: Y and Z values of fourth corner (in OCS)




Vertex group codes


100 Subclass marker (AcDbVertex)

100 Subclass marker (AcDb2dVertex or AcDb3dPolylineVertex)

10 Locat ion point (in OCS when 2D, and WCS when 3D)DXF: X value; APP: 3D point

20, 30 DXF: Y and Z values of location point (in OCS when 2D, and WCS when3D)

40 Start ing width (optional; default is 0)

Trace group codes (continued )


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Every vertex th at is part of a polyface m esh h as its vertex flag 128 bit set. If

th e en tity sup plies th e coordinat e of a vertex of th e m esh , its 64 bit is set as

well, and th e 10, 20, 30 groups give the vertex coord inate. The vertex ind ex

values are determ ined b y th e order in wh ich the vertex ent ities appear with in

the polyline, with th e first bein g num bered 1.

If th e vertex defines a face of th e mesh , its vertex flags group h as th e 128 bit

set but n ot th e 64 bit. In th is case, th e 10, 20, 30 (location ) groups of the face

entity are irrelevant and are always written as 0 in a DXF file. The vertex

in dexes th at defin e the m esh are given by 71, 72, 73, and 74 group codes, th e

values of wh ich specify on e of th e previously defin ed vertexes by ind ex. If the

41 Ending width (opt ional; default is 0)

42 Bulge (op tional; default is 0). The bulge is the tangent of one fourth the

included angle for an arc segment, made negative if the arc goesclockwise from the start point to the endpoint. A bulge of 0 indicates astraight segment, and a bulge of 1 is a semicircle

70 Vertex flags:1 = Extra vertex created by curve-fit t ing2 = Curve-fit tangent defined for this vertex. A curve-fit tangentdirection of 0 may be omit ted from DXF outpu t but is significant if thisbit is set4 = Not used8 = Spline vertex created by spline-fitting16 = Spline frame control point32 = 3D polyline vertex64 = 3D polygon mesh128 = Polyface mesh vertex

50 Curve fit tangent direct ion

71 Po lyface mesh vertex index. Opt ional. Present only if nonzero



74 Polyface mesh vertex index. Opt ional. Present only if nonzero

Vert ex group codes (continued )


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VIEWPORT | 109

in dex is n egative, th e edge th at begins with th at vertex is in visible. The first

0 vertex marks th e en d of th e vertices of th e face.

VIEW PORT

The followin g grou p codes apply to viewport en tities. In addition to th e




Viewport group codes


100 Subclass marker (AcDbViewport)

10 Center point (in WCS)DXF: X value; APP: 3D point

20, 30 DXF: Y and Z values of center point (in WCS)

40 Width in paper space units

41 Height in paper space units

68 Viewport status field: –1 = On, but is fully off screen, or is one of the viewports that is notactive because the $MAXACTVP count is currently being exceeded.0 = Off

<positive value > = On and active. The value indicates the order ofstacking for the viewports, where 1 is the act ive viewport, 2 is the next,and so forth

69 Viewport ID

12 View center point (in DCS)DXF: X value; APP: 2D point

22 DXF: View center point Y value (in DCS)

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13 Snap base pointDXF: X value; APP: 2D point

23 DXF: Snap base point Y value

14 Snap spacingDXF: X value; APP: 2D point

24 DXF: Snap spacing Y value

15 Grid spacingDXF: X value; APP: 2D point

25 DXF: Grid spacing Y value

16 View direction vector (in WCS)


26, 36 DXF: Y and Z values of view direction vector (in WCS)

17 View target point (in WCS)DXF: X value; APP: 3D vector

27, 37 DXF: Y and Z values of view t arget point ( in WCS)

42 Perspective lens length

43 Front clip plane Z value

44 Back clip plane Z value

45 View height (in model space units)

50 Snap angle

51 View twist angle

72 Circle zoom percent

341 Frozen layer object ID/handle (mult iple ent ries may exist ) (optional)

Viewport group codes (continued )


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VIEWPORT | 111

90 Viewport status bit coded flags:1 (0x1) = Enables perspective mode2 (0x2) = Enables front clipping

4 (0x4) = Enables back clipping8 (0x8) = Enables UCS follow16 (0x10) = Enables front clip not at eye32 (0x20) = Enables UCS icon visibility64 (0x40) = Enables UCS icon at origin128 (0x80) = Enables fast zoom256 (0x100 ) = Enables snap mode512 (0x200) = Enables grid mode1024 (0x400) = Enables isometric snap style2048 (0x800) = Enables hide plot mode4096 (0x1000) = kIsoPairTop. If set and kIsoPairRight is not set, thenisopair top is enabled. If both kIsoPairTop and kIsoPairRight are set,then isopair left is enabled8192 (0x2000) = kIsoPairRight. If set and kIsoPairTop is not set, then

isopair right is enabled16384 (0x4000) = Enables viewport zoom locking32768 (0x8000) = Currently always enabled65536 (0x10000) = Enables non-rectangular clipping131072 (0x20000) = Turns the viewport off

340 Hard-pointer ID/handle to enti ty that serves as the viewport’s cl ippingboundary (only present if viewport is non-rectangular)

1 Plot style sheet name assigned to this viewport

281 Render mode:0 = 2D Optimized (classic 2D)

1 = Wireframe2 = Hidden line3 = Flat shaded4 = Gouraud shaded5 = Flat shaded with wireframe6 = Gouraud shaded with wireframe


71 UCS per viewport flag:0 = The UCS will not change when this viewport becomes active.1 = This viewport stores its own UCS which wil l become the current

UCS whenever the viewport is activated



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NOT E The ZOOM XP factor is calculated with the following formula:

group_41 / group_45 (or pspace_height / mspace_height).

74 Display UCS icon at UCS origin flag:

Controls whether UCS icon represents viewport UCS or current UCS

(these will be different if UCSVP is 1 and viewport is not active).However, this field is currently being ignored and the icon alwaysrepresents the viewport UCS










146 Elevat ion



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XLINE | 113

XLINE

The followin g grou p codes apply to xlin e entities. In add ition to th e group




Xline group codes


100 Subclass marker (AcDbXline)

10 First point (in WCS)DXF: X value; APP: 3D point

20, 30 DXF: Y and Z values of first point (in WCS)

11 Unit direction vector (in WCS)DXF: X value; APP: 3D vector

21, 31 DXF: Y and Z values of unit direction vector (in WCS)

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11

OBJECTS Section

Th is ch apter present s th e group codes that ap ply to n on -

graph ical ob ject s. Th ese cod es are foun d in t h e OBJECTS

sect ion of a DXF™ file an d are u sed by Auto LISP® an d

ObjectARX™ applications in entity definition lists.

In this chapter

s OBJECT Section Group Co

s Common Group Codes for

Objects

s ACAD_PROXY_OBJECT

s ACDBDICTIONARYWDFL

s ACDBPLACEHOLDER

s DICTIONARY

s DICTIONARYVAR

s DIMASSOC

s GROUP

s IDBUFFER

s IMAGEDEF

s IMAGEDEF_REACTOR

s LAYER_INDEX

s LAYER_FILTER

s LAYOUT

s MLINESTYLE

s OBJECT_PTR

s PLOTSETTINGS

s RASTERVARIABLES

s SPATIAL_INDEX

s SPATIAL_FILTER

s SORTENTSTABLE

s VLA_PROJECT

s XRECORD

7

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116 | Chapter 7 OBJECTS Section

OBJECT Section Group Codes

Objects are similar to ent ities, except th at th ey h ave n o graph ical or geom et-

ric m ean ing. All objects th at are n ot en tities or sym bol table records or sym -

bol tables are sto red in t h is section . This section represen ts a ho m ogeneou s

h eap o f ob jects with t opological orderin g of objects by own ership, such t ha tthe owners always appear before the objects they own.

Object Ownership

Th e root own er of m ost objects app earin g in th e OBJECTS section is th e

n am ed object diction ary, which is, therefore, always th e first object th at

appears in th is section. O bjects th at are n ot owned by th e n amed object dic-

tiona ry are own ed by oth er ent ities, objects, or sym bol table en tries. Objects

in th is section m ay be defin ed by AutoCAD® or by app lication s with access

to ObjectARX™ API. The D XF nam es of application -defin ed o bject types

sh ou ld always be associated with a class n am e in t h e CLASS section of th e

DXF file, or else th e object record cann ot be bou n d to th e application th at

will in terpret it .

As with oth er diction aries, th e n am ed-ob ject diction ary record co nsists solely

of associated pairs of entr y n am es and h ard own ersh ip p oin ter referen ces to

th e associated ob ject.

To avoid n am e collision between objects, developers shou ld always use th eir

registered developer prefix for their entries.

Common Group Codes for Objects

Th e followin g table sh ows grou p codes th at app ly to virtually all non graph -

ical objects. Wh en you refer to a t able of group codes by object type, a list of

codes associated a specific object, keep in m ind t h at th e codes shown h ere can

also be present. Som e of th e grou p codes are in clud ed with an object on ly if

th e object ha s n on default values for tho se group code propert ies. For infor-

m ation about ab breviations and form atting used in t h is table, see “Format-

ting Con ven tion s in Th is Referen ce” on page 6.

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The 92 field is no t used for AcDbProxyOb ject. Objects of th is class never h ave

graphics.

ACDBDICTIONARYW DFLT

The followin g grou p cod es are used b y ACDBDICTIONARYWDFLT ob jects. In


Objects” on page 116. For information about a bbreviations and form atting


ACAD_PROXY_OBJECT group codes


100 DXF™: Subclass marker (AcDbProxyObject)

90 DXF: Proxy object class ID (always 499)

91 DXF: Applicat ion object ’s class ID. Class IDs are based on the order ofthe class in the CLASSES section. The first class is given the ID of 500,the next is 501, and so on

93 DXF: Size of object data in bits

310 DXF: Binary ob ject data (mult ip le ent ries can appear) (optional)

330 or 340 or350 or 360

DXF: An object ID (multiple entries can appear) (optional)

94 DXF: 0 (indicates end of object ID section)

95 DXF: Object drawing format w hen it b eco mes a p ro xy (a 32-b itunsigned integer):Low word is AcDbDwgVersionHigh word is MaintenanceReleaseVersion

70 DXF: Original custom object data format:0 = DWG format1 = DXF format

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ACDBPLACEHOLDER | 119

ACDBPLACEHOLDER

The followin g group codes a re used by th e ACDBPLACEHOLDER objects. In




ACDBDICTIO NARYW DFLT group codes


0 Object name (ACDBDICTIONARYWDFLT)

5 Handle

102 Start of persistent reactors group; always “{ACAD_REACTORS”

330 Soft-pointer ID/ handle to owner dictionary

102 End of persist ent reactors group, always “ }”

330 Soft-owner ID/handle to owner object

100 Subclass marker (AcDbDictionary)

281 Duplicate record cloning flag (determ ines how to merge dup licateentries):0 = Not applicable1 = Keep existing2 = Use clone3 = <xref>$0$<name>4 = $0$<name>5 = Unmangle name

3 Entry name (one for each entry)

350 Soft-owner ID/handle to entry object (one for each entry)

100 Subclass m arker (AcDbDictionaryWit hDefault)

340 Hard poin ter to default ob ject ID/handle (current ly on ly used for plotstyle dictionary’s default entry, named “ Normal” )

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DICTIONARY

The followin g grou p cod es are used by DICTIONARY ob jects. In ad ditio n t o

th e group codes described h ere, see “Com m on Group Codes for Objects” on

page 116. For information about abbreviation s an d form atting used in th is


ACDBPLACEHOLDER group codes


0 Object name (ACDBPLACEHOLDER)

5 Handle





DICT IO NARY group codes


0 Object name (DICTIONARY)

5 Handle





100 Subclass marker (AcDbDictionary)

280 Hard owner f lag. If set to 1, indicates that elements of the dict ionary areto be treated as hard owned

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DICTIONARYVAR | 121

AutoCAD® m ain tains item s such as m lin e styles an d group definition s as

objects in diction aries. Th e following section s describe th e AutoCAD object

grou p codes main tained in diction aries; h owever, ot her app lication s are freeto create an d u se th eir own d iction aries as they see fit. The p refix " A C AD _ " is

reserved for use by AutoCAD applications.

DICTIONARYVAR

The followin g group codes are used by DICTIONARYVAR objects. In add ition

to t h e grou p codes described h ere, see “Com m on G roup Codes for Objects”

on p age 116. For information about abbreviations an d form atting used in


281 Duplicate record cloning flag (determ ines how to merge dup licateentries):0 = Not applicable

1 = Keep existing2 = Use clone3 = <xref>$0$<name>4 = $0$<name>5 = Unmangle name

3 Entry name (one for each entry) (opt ional)

350 Soft-owner ID/handle to entry object (one for each entry) (option al)

DICT IO NARYVAR group codes


0 Object name (DICTIONARYVAR)

5 Handle


330 Soft-pointer ID/ handle to owner dictionary(ACDBVARIABLEDICTIONARY)


DICTIONARY group codes (continued )


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DICTIONARYVAR ob jects are used b y Aut oCAD as a m ean s to store n am ed

values in t h e database for s e t v a r / g e t v a r purposes with out th e n eed t o add

ent ries to th e DXF™ HEADER section. Currently, the system variables that

are stored as DICTIONARYVAR objects are: DIMADEC, DIMDSEP,

INDEXCTL, PROJECTNAME, an d XCLIPFRAME.

DIMASSOCTh e followin g group cod es are used by DIMASSOC o bjects. In addition to t h e

grou p codes described h ere, see “Comm on Group Cod es for Objects” on page

116 . For informat ion about ab breviations and forma ttin g used in th is table,


100 Subclass m arker (DictionaryVariables)

280 Object schema number (currently set to 0)

1 Value of variable

DIMASSOC group codes


0 Object name (DIMASSOC)

5 Handle

102 Persistent reactors group; always “ {ACAD_REACTORS}”

330 Soft-pointer ID

100 Subclass marker (AcDbDimAssoc)

330 ID of dimension object

DICTIONARYVAR group codes (continued )


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DIMASSOC | 123

DIMASSOC objects implement associative dimensions by specifying anassociation bet ween a dim en sion object an d drawin g geom etry ob jects. An

90 Associativity flag1 = First point reference2 = Second point reference

4 = Third point reference8 = Fourth point reference

70 Trans-space flag (t rue/false)

71 Rotat ed Dimension type (parallel, perpendicular)

1 Class name (AcDbOsnapPointRef)

72 Object Osnap type (Start, End, Mid, Cen, etc.)

331 ID of main object (geometry)

73 SubentType of main object (edge, face)

91 GsMarker of main object (index)

301 Handle (string) of Xref object

40 Geometry parameter for Near Osnap

10 Osnap point in WCS; X value

20 Osnap point in WCS; Y value

30 Osnap point in WCS; Z value

332 ID of intersect ion object (geometry)

74 Subent Type of intersction object (edge/ face)

92 GsMarker of intersection object (index)

302 Handle (st ring) of intersect ion Xref object

75 hasLastPointRef flag (true/false)

DIMASSOC group codes (continued )


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associative dim en sion is a dim en sion th at will autom atically updat e when

th e associated geom etry is modified.

GROUPTh e followin g grou p codes are used by GROUP objects. In add ition to t h e




GROUP group codes


0 Object name (GROUP)

5 Handle

102 Start of persistent reactors group; always “{ACAD_REACTORS”(persistent reactors group appears in all d ictionaries except the maindictionary)

330 Soft-pointer ID/handle to owner dict ionary. For GROUP objects this isalways the ACAD_GROUP entry of the named object dictionary



100 Subclass marker (AcDbGroup)

300 Group descript ion

70 “ Unnamed” flag: 1 = Unnamed; 0 = Named

71 Selectabilit y flag: 1 = Select able; 0 = Not select able

340 Hard-pointer handle to en tity in group (one ent ry per ob ject )

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IMAGEDEF_REACTOR

The following grou p codes are u sed b y IMAGEDEF_REACTOR ob jects. In




IMAGEDEF group codes


0 Object name (IMAGEDEF)

5 Handle


330 Soft-po in ter ID/hand le to the ACAD_IMAGE_DICT dictionary

330 Sof t-po in ter ID/handle to IMAGEDEF_REACTOR object (multipleentries; one for each instance)


100 Subclass m arker (AcDbRast erImageDef)

90 Class version. 0 = R14 version

1 File name of image

10 Image size in pixelsDXF: U value; APP: 2D point (U and V values)

20 DXF: V value of image size in pixels

11 Default size of one pixel in AutoCAD unitsDXF: U value; APP: 2D point (U and V values)

12 DXF: V value of pixel size

280 Image-is-loaded flag. 0 = Unloaded; 1 = Loaded

281 Resolut io n u nits. 0 = N o u nits; 2 = Cen timet ers; 5 = Inch

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LAYER_INDEX | 127

LAYER_INDEX

The followin g group codes are u sed by LAYER_INDEX objects. In addit ion to


page 116. For information about abbreviation s an d formattin g used in t h is


IMAGEDEF_REACTO R group codes


0 Object name (IMAGEDEF_REACTOR)

5 Handle

100 Subclass marker (AcDbRasterImageDefReactor)


330 Object ID for associated image object

LAYER_IN DEX group codes


0 Object name (LAYER_INDEX)

5 Handle




100 Subclass marker (AcDbIndex)

40 Time stamp (Julian date)

100 Subclass marker (AcDbLayerIndex)

8 Layer name (multiple entries may exist)

360 Hard owner reference to IDBUFFER (mult ip le entr ies may exist)

90 Number o f ent ries in the IDBUFFER list (mult iple ent ries may exist )

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LAYER_FILTER

The followin g grou p cod es are used by LAYER_FILTER ob jects. In a dd itio n to




LAYOUTThe following group codes are used by LAYOUT objects. In addition to the




LAYER_FILTER group codes


0 Object name (LAYER_FILTER)

5 Handle




100 Subclass marker (AcDbFilter)

100 Subclass marker (AcDbLayerFilter)

8 Layer name (multiple entries may exist)

LAYOUT group codes


0 Object name (LAYOUT)

5 Handle

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LAYOUT | 129





100 Subclass marker (AcDbPlotSett ings)

plotsettings object group codes

For group codes and descript ions following the AcDbPlotSettingsmarker, see “ PLOTSETTINGS” on page 133

100 Subclass marker (AcDbLayout)

1 Layout name

70 Flag (bit -coded) to control the following:1 = Indicates the PSLTSCALE value for this layout when this layout iscurrent2 = Indicates the LIMCHECK value for t his layout when th is layout iscurrent

71 Tab order. This number is an ordinal indicat ing this layout’s ordering inthe tab cont rol that is attached to the AutoCAD drawing framewindow. Note that the “Model” tab always appears as the first tabregardless of its tab order

10 Min imum lim its for th is layout (defined by LIMMIN wh ile this layout is

current)DXF: X value; APP: 2D point

20 DXF: Y value of minimum limits

11 Maximum lim it s for this layou t (defined by LIMMAX while this layou t iscurrent):DXF: X value; APP: 2D point

21 DXF: Y value of maximum limits

12 Insert ion base point for this layout (defined by INSBASE while thislayout is current):


22, 32 DXF: Y and Z values of the insertion base poin t

LAYOUT group codes (continued )


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14 Min imum extents for th is layout (defined by EXTMIN wh ile this layou tis current) :DXF: X value; APP: 3D point

24, 34 DXF: Y and Z values of the minimum extents

15 Maximum extents for this layout (defined by EXTMAX while this layoutis current) :DXF: X value; APP: 3D point

25, 35 DXF: Y and Z values of the maximum extents

146 Elevat ion








330 ID/handle to this layout ’s associated paper space block table record

331 ID/handle to the viewpor t that was last act ive in th is layout when thelayout was current



LAYOUT group codes (continued )


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MLINESTYLE | 131

MLINESTYLE

The followin g group codes ar e used b y MLINESTYLE objects. In add ition to


page 116. For information about abbreviation s an d formattin g used in t h is


MLINESTYLE group codes


0 Object name (MLINESTYLE)

5 Handle

102 Start of persistent reactors group; always “{ACAD_REACTORS”(persistent reactors group appears in all d ictionaries except the main

dictionary)

330 Soft-pointer ID/handle to owner dict ionary. For MLINESTYLE objectsthis is always the ACAD_MLINESTYLE entry of the named objectdictionary

102 End of persist ent reactors group; always “ }”

100 Subclass marker (AcDbMlineStyle)

2 Mline style name

70 Flags (bit-coded):

1 =Fill on2 = Display miters16 = Start square end (line) cap32 = Start inner arcs cap64 = Start round (out er arcs) cap256 = End square (line) cap512 = End inner arcs1024 = End round (outer arcs) cap

3 St yle descript ion (string, 255 charact ers maxim um)

62 Fill color (integer, default = 256)

51 Start angle (real, default is 90 degrees)

52 End angle (real, default is 90 degrees)

71 Number of elements

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PLOTSETTINGS | 133

PLOTSETTINGS

The followin g group codes ar e used b y PLOTSETTINGS objects. In add ition




1001 Begin ASE xdata (DC015)

PLOTSETTINGS group codes


0 Object name (PLOTSETTINGS)

5 Handle





100 Subclass marker (AcDbPlotSett ings)

1 Page Setup name

2 Name of system printer or plot configuration file

4 Paper size

6 Plot view name

40 Size, in millimeters, of unpr intab le marg in on the left side of the paper

41 Size, in millimeters, of unprintab le marg in on the bottom of the paper

42 Size, in millimeters, o f unpr intab le margin on the r ight side of the paper

43 Size, in millimeters, of unprintab le marg in on the top of the paper

OBJECT _PTR group codes (continued )


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44 Plot paper size: physical paper widt h in millimet ers

45 Plot paper size: physical paper height in millimet ers

46 Plot origin: X value of origin offset in millimeters

47 Plot origin: Y value of origin offset in m illimeters

48 Plot window area: X value of lower left window corner

49 Plot window area: Y value of upper right window corner

140 Plot window area: X value of lower left window corner

141 Plot window area: Y value of upper right window corner

142 Num erat or of custom prin t scale: real world (pap er) u nits

143 Denominator of custom print scale: drawing unit s

70 Plot layout flag:1 = PlotViewportBorders2 = ShowPlotStyles4 = PlotCentered8 = PlotHidden16 = UseStandardScale32 = PlotPlotStyles64 = ScaleLineweights128 = PrintLineweights

512 = DrawViewportsFirst1024 = ModelType2048 = UpdatePaper4096 = ZoomToPaperOnUpdate8192 = Initializing16384 = PrevPlotInit

72 Plot paper units:0 = Plot in inches1 = Plot in millimeters2 = Plot in pixels

73 Plot rotation:

0 = No rotation1 = 90 d egrees counterclockwise2 = Upside down3 = 90 degrees clockwise

PLOTSETTIN GS group codes (continued )


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RASTERVARIABLES | 135

RASTERVARIABLESTh e follow ing grou p codes are used by RASTERVARIABLES ob ject s. In addi-

tion to th e grou p codes described h ere, see “Comm on Group Codes for



74 Plot t ype (port ion of paperspace to out put to the media):0 = Last screen display1 = Drawing extents

2 = Drawing limit s3 = View specified by code 64 = Window specified by codes 48, 49, 140, and 1415 = Layout information

7 Current style sheet

75 Standard scale type:0 = Scaled to Fit1 = 1/ 128"=1'; 2 = 1/64"=1'; 3 = 1/32"=1'4 = 1/ 16"=1'; 5 = 3/ 32"=1'; 6 = 1/ 8"=1'7 = 3/ 16"=1'; 8 = 1/ 4"=1'; 9 = 3/ 8"=1'10 = 1/2"=1'; 11 = 3/ 4"=1'; 12 = 1"=1'13 = 3"=1'; 14 = 6"=1'; 15 = 1'=1'16= 1:1 ; 17= 1:2; 18 = 1:4; 19 = 1:8; 20 = 1:10; 21= 1:1622 = 1:20; 23 = 1:30; 24 = 1:40; 25 = 1:50; 26 = 1:10027 = 2:1; 28 = 4:1; 29 = 8:1; 30 = 10:1; 31 = 100:1; 3 2 = 1000:1

147 A f loat ing point scale factor that represents the standard scale valuespecified in code 75

148 Paper image origin: X value

149 Paper image origin: Y value

RASTERVARIABLES group codes


0 Object name (RASTERVARIABLES)

5 Handle


PLOTSETTIN GS group codes (continued )


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SPATIAL_INDEX

The followin g grou p codes are used by SPATIAL_INDEX o bjects. In addit ion


on p age 116. For information about ab breviations an d form atting used in


330 Soft-pointer ID/handle to owner dictionary. For a RASTERVARIABLESobject th is is always the ACAD_IMAGE_VARS entry of the named objectdictionary


100 Sub class m arker (AcDbRast erVariables)


70 Display-imag e-fram e flag. 0 = N o frame; 1 = Display frame

71 Image display qualit y (screen only). 0 = Draft ; 1 = High

72 AutoCAD units for insert ing images. This is what one Au toCAD un it isequal to for the purpose of inserting and scaling images with an

associated resolution:0 = None; 1 = M illimeter; 2 = Centimeter;3 = Meter; 4 = Kilometer; 5 = Inch;6 = Foot; 7 = Yard; 8 = Mile

SPATIAL_IN DEX group codes


0 Object name (SPATIAL_INDEX)

5 Handle




100 Subclass marker (AcDbIndex)

RASTERVARIABLES group codes (continued )


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SPATIAL_FILTER | 137

The SPATIAL_INDEX is always wr itt en out em pty t o a DXF file. This ob ject

can be ign ored.

SPATIAL_FILTER

The followin g grou p codes are used b y SPATIAL_FILTER object s. In addit ion




40 Timestamp (Julian date)

100 Subclass marker (AcDbSpat ialIndex)

SPATIAL_FILTER group codes


0 Object name (SPATIAL_FILTER)

5 Handle


330 Soft-po in ter ID/hand le to owner dictionary (SPATIAL)


100 Subclass marker (AcDbFilter)

100 Subclass m arker (AcDbSpat ialFilter)

70 Number of points on the clip boundary2 = Rectangular clip boundary (lower-left and upper-right)greater than 2 = Polyline clip boundary

10 Clip boundary defin it ion point (in OCS) (always 2 or more) based on anxref scale of 1DXF: X value; APP: 2D point

20 DXF: Y value of boundary definition point (always 2 or more)

SPATIAL_INDEX group codes (continued )


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SORTENTSTABLE

The followin g group cod es a re used b y SORTENTSTABLE ob jects. In add itio n


on p age 116. For information about ab breviations an d form atting used in


210 Normal to the plane cont aining t he clip boundaryDXF: X value; APP: 3D vector

220, 230 DXF: Y and Z values of extrusion direction

11 Origin used to define the local coord inate system of the clip boundaryDXF: X value; APP: 3D point

21, 31 Origin used to define the local coordinate system of the cl ip boundaryDXF: Y and Z values

71 Clip boundary display enabled flag0 = Disabled; 1 = Enabled

72 Front clipping plane flag; 0 = No; 1 = Yes

40 Front clipping plane distance (if code 72 = 1)

73 Back clipping plane flag; 0 = No; 1 = Yes

41 Back clipping plane distance (if code 73 = 1)

40 4x3 t ransformat ion mat rix writt en out in column major o rd er. Th ismatrix is the inverse of the original block reference (insert entity)transformation. The original block reference transformation is the onethat is applied to all entities in the block when the block reference isregenerated (always 12 entries)

40 4x3 t ransformat ion mat rix writt en out in column major o rd er. Th is

matrix transforms points into the coordinate system of the clipboundary (12 entries)

SPATIAL_FILTER group codes (continued )


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XRECORD

Th e followin g group codes are com m on to all xrecord objects. In addition to




VBA_PROJECT group codes


0 Object name (VBA_PROJECT)

5 Handle




330 Soft-owner ID/handle to owner object

100 Subclass marker (AcDbVbaProject)

90 Num ber o f byt es of binary chun k dat a (cont ained in t he group code310 records that follow)

310 DXF™: Binary ob ject data (multiple entr ies containing VBA projectdata)

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144 | Chapter 8 THUMBNAILIMAGE Section

THUMBNAILIMAGE Section Group Codes

The followin g group codes are foun d in th e THUMBNAILIMAGE section . For


m atting Con vention s in This Reference” on page 6.

THUMBNAILIMAGE group codes


90 The numb er of byt es in t he imag e (and subsequen t binary ch unkrecords)

310 Preview image data (multiple l ines; 256 characters maximum per l ine)

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14

Drawing Interchange File

Formats

Th is app en dix describes th e various file format s

AutoCAD® uses to interchan ge drawin g data with o th er

application s. Th e form ats p resen ted a re Drawin g

In terch an ge File (DXF™), bin ary DXF, Slide (SLD), an d

th e Slide Library (SLB) file form at s.

DXF files can be eith er ASCII or bin ary form ats. Because

ASCII DXF files are mo re com m on th an th e bin ary

form at, th e term DXF file is used to refer to ASCII DXF

files and th e term binary DX F file is used for th e binary

format.

In this chapter

s ASCII DXF Files

s Binary DXF Files

s Slide Files

s Slide Library Files

A

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146 | Appendix A Drawing Interchange File Formats

ASCII DXF Files

This section describes th e form at o f ASCII DXF files. It con tain s inform ation

th at is need ed on ly if you write you r own program s to process DXF files or

work with en tity in format ion obt ained by Aut oLISP® an d Ob jectARX™

applications.

General DX F File Structure

Essentially a DXF file is compo sed of pa irs of cod es an d a ssociated values. The

codes, kno wn as group codes, indicate th e type of value th at follows. Usin g

th ese group code an d value pa irs, a DXF file is organized in to section s, com -

posed of records, wh ich are com po sed of a grou p code an d a dat a item . Each

grou p code an d value is on its own lin e in t he DXF file.

Each section starts with a grou p cod e 0 followed b y th e string, SECTION. Th is

is followed by a group code 2 an d a strin g indicating th e na m e of th e section(for exam ple, HEADER). Each section is com posed o f group codes an d va lues

th at defin e its element s. A section en ds with a 0 followed b y the strin g

ENDSEC.

It may b e h elpful to pro du ce a DXF file from a small drawin g, prin t it ou t,

and refer to it while readin g the in form ation presented in this section .

The overall organ ization of a DXF file is as follows:

s HEADER section. Con tains general information about th e drawing. It con -

sists of an AutoCAD data base version n um ber and a n um ber of system

variables. Each param eter con tains a variable nam e an d its associated

value.

s CLASSES section. Holds the in form ation for application -defined classes,

wh ose in stan ces appea r in t h e BLOCKS, ENTITIES, an d OBJECTS section s

of th e dat abase. A class defin ition is perman en tly fixed in class hierarchy.

s TABLES section. Con tains definition s for th e followin g sym bo l tab les.

APPID (application identification table)

BLOCK_RECORD (block referen ce tab le)

DIMSTYLE (dim ension style tab le)

LAYER (layer table)

LTYPE (linetype table)STYLE (text style table)

UCS (User Coordinate System table)

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ASCII DXF Files | 147

VIEW (view table)

VPORT (viewport configuration table)

s BLOCKS section . Con tain s block definition an d drawing entities that m ake

up each block reference in th e drawing.

s ENTITIES section. Con tains th e graph ical objects (en tities) in th e drawing,

includin g block referen ces (insert en tities).s OBJECTS section. Con tain s the n ongraph ical objects in t he drawing. All

objects th at are n ot en tities or symbol table records or sym bol tables are

stored in th is section . Exam ples of en tries in t h e OBJECTS section are dic-

tionaries that contain m line styles and groups.

s THUMBNA ILIMAGE section. Con tain s the p review ima ge data for of the

drawing. This section is option al.

If you use th e Select O bjects opt ion of the SAVE and SAVEAS comm ands, the

resulting DXF file con tain s on ly th e ENTITIES section an d t he EOF m arker.

The ENTITIES section con tain s on ly th e objects you select for ou tpu t. If you

select an insert en tity, th e correspon ding block definition is n ot in clud ed in

the ou tput file.

Group Codes in DX F Files

Group codes an d t h e associated values defin e a specific aspect of an object or

ent ity. Th e lin e imm ediately followin g th e group code is th e associated value.

Th is value can be a a string, an in teger, or a floatin g-point value, such as the

X coordin ate of a poin t. Th e lin es followin g the secon d line of the grou p, if

any, are determined by th e group defin ition and the d ata associated with t h e

group.

Special group cod es are used as file separators, such as m arkers for t h e begin -n ing an d en d of section s, tables, and t h e end of the file itself.

En tities, objects, classes, tables and table en tries, an d file separat ors are in tro-

du ced with a 0 grou p code th at is followed by a nam e describing th e group .

The maximum DXF file string length is 256 characters. If your AutoCAD

drawing con tains strings th at exceed th is nu m ber, tho se strings are tru n cated

during SAVE, SAVEAS, an d WBLOCK. OPEN an d INSERT fail if your DXF file

con tain s strin gs th at exceed th is n um ber.

ASCII Control Characters in DX F Files

SAVEAS h an dles ASCII con trol ch aracters in text strings by expan ding t h e

character int o a caret (^ ) followed by th e app ropriate letter. For exam ple, an

ASCII Con trol-G (BEL, decim al code 7) is written a s ^G. If th e text itself

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con tain s a caret ch aracter, it is expand ed to caret, space (^ ). OPEN an d INSERT

perform th e com plemen tary con version .

Header Group Codes in DX F Files

Applications can retrieve the values of these variables with the AutoLISP

g e t v a r function.

The followin g is an exam ple of t he H EADER section of a DXF™ file:

Class Group Codes in DX F Files

The followin g is an exam ple of th e CLASSES section of a DXF file:

0SE C TI ON

2HE A DE R

Beginning of HEADER section

9$ < v a r i a b l e >< g r o u p c o d e >< v a l u e >

Repeats for each header variable

0E NDS E C End of HEADER section

0SE C TI ON

2C L A S S E S

Beginning of CLASSES section

0

C L A S S1

< c l a s s d x f r e c o r d >2

< c l a s s n a me >3

< a p p n a m e >9 0

< f l a g >2 8 0< f l a g >2 8 1< f l a g >

Repeats for each entry

0E NDS E C End of CLASSES section

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Symbol Table Group Codes in DX F Files

The followin g is an exam ple of the TABLES section o f a DXF file.

Symbol Table Example

This DXF sequence represents three full objects: the symbol table itself plus

two entries.

0SE C TI ON

2T A B L E S

Beginning of TABLES section

0T A B L E

2< t a b l e t y p e >

5< h a n d l e >1 0 0Ac D b S y mb o l T a b l e

7 0< ma x . e n t r i e s >

Common table group codes, repeats for each entry

0< t a b l e t y p e >

5< h a n d l e >1 0 0Ac D b S y mb o l T a b l e Re c o r d

.

. < d a t a >

.

Table entry data, repeats, for each tablerecord

0E N D T A B

End of tab le

0E NDS E C

End of TABLES section

0

T A B L E Indicates a symbol table entry

2

S T Y L E Text style symbol table entry. Exceptionto rule that code 0 fully defines type

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5

1 C STYLE table handle; sam e as for entities and other objects

7 0

3 Maximum num ber of STYLE table

records to follow (pre-Release 13 field) 1 0 0 1

A P P _ X APP_X has put xdata on a symboltable

1 0 4 0

4 2 . 0 Just a single floating-point number

0

S T Y L E Beginning of first element in the STYLE symbol table

5

3 A The first entry’s handle (DIMSTYLE entries will have 105 here)

2

E N T R Y _ 1 Th e first entry’s text nam e

7 0

6 4 Standard flag values

4 0

. 4 Text height

4 1

1 . 0 W idth scale factor 5 0

0 . 0 Oblique angle

7 1

0 Text generation flags

4 2

0 . 4 Last height used

3

B UF ON T S . T X T Primary font file name

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Blocks Group Codes in DX F Files

The followin g is an exam ple of t he BLOCKS section of a DXF file:

0SE C TI ON

2B L O C K S

Beginning of BLOCKS section

0B L OCK

5< h a n d l e >1 0 0Ac D b E n t i t y

8< l a y e r >1 0 0Ac D b B l o c k B e g i n

2< b l o c k n a me >

7 0< f l a g >

1 0< X v a l u e >

2 0< Y v a l u e >

3 0< Z v a l u e >

3< b l o c k n a me >

1< x r e f p a t h >

Begins each block entry (a block entitydefinition)

0

< e n t i t y t y p e >.. < d a t a >.

One entry for each entity definition

within the block

0E N D B L K

5< h a n d l e >1 0 0Ac D b Bl o c k E n d

End of each block entry (an endblk entity definition)

0E NDS E C

End of BLOCKS section

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Entity Group Codes in DXF Files

The followin g is an exam ple of th e ENTITIES section of a DXF file:

Object Group Codes in DX F Files

The followin g is an exam ple of t he O BJECTS section of a DXF file:

0SE C TI ON

2EN T I T I ES

Beginning of ENTITIES section

0< e n t i t y t y p e >

5< h a n d l e >3 3 0< p o i n t e r t o o w n e r >1 0 0Ac D b E n t i t y

8< l a y e r >1 0 0Ac D b < c l a s s n a me >

.

. < d a t a >

.

One entry for each entity definition

0E NDS E C

End of ENT ITIES section

0SE C TI ON

2OB J E C T S

Beginning of OBJECTS section

0DI C TI ONA RY

5< h a n d l e >1 0 0Ac D b D i c t i o n ar y

Beginning of named object dictionary(root d ictionary object)

3< d i c t i o n a r y n a me >3 5 0< h a n d l e o f c h i l d >

Repeats for each entry

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W riting a DX F Interface Program

Writing a program t h at com m un icates with AutoCAD by m eans of th e DXF

file app ears m ore difficult th an it actually is. Th e DXF format m akes it easy

to ign ore in form ation you don ’t n eed, wh ile readin g the information you do

need.

Reading a DX F File

The following ex am ple is a simp le Visual Basic program th at read s a DXF file

an d extracts specific codes and values from a given object in a given section .

0< o b j e c t t y p e >

.

. < d a t a >

.

Groups of object data

0E NDS E C

End of OBJECTS section

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' R e a d DX F e x t r a c t s s p e c i f i e d c o d e / v a l u e p a i r s f r o m a D XF f i l e .' T h i s f u n c t i o n r e q u i r e s f o u r s t r i n g p a r a me t e r s , a v a l i d DX F' f i l e n a me , a DXF s e c t i o n n a me , t h e n a me o f a n o b j e c t i n t h a t' s e c t i o n , a n d a c o mma d e l i mi t e d l i s t o f c o d e s .'F u n c t i o n Re a d DXF ( _

By V a l d x f F i l e As St r i n g , B y Va l s t r S e c t i o n A s S t r i n g , _ By V a l s t r O b j e c t As S t r i n g , By V a l s t r C o d e L i s t A s St r i n g )

D i m t mp Co d e , l a s t Ob j A s S t r i n gOp e n d x f F i l e F o r I n p u t As # 1' Ge t t h e f i r s t c o d e / v a l u e p a i rc o d e s = R e a d Co d e s' L o o p t h r o u g h t h e wh o l e f i l e u n t i l t h e " E OF " l i n eWh i l e c o d e s ( 1 ) < > " E OF "

' I f t h e g r o u p c o d e i s ' 0 ' a n d t h e v a l u e i s ' S EC T I ON' . .I f c o d es ( 0 ) = " 0 " A n d c o d e s ( 1 ) = " S ECT I O N" T h e n

' T h i s mu s t b e a n e w s e c t i o n , s o g e t t h e n e x t' c o d e / v a l u e p a i r .c o d e s = R e a d Co d e s ( )' I f t h i s s e c t i o n i s t h e r i g h t o n e . .I f c o d e s ( 1 ) = s t r S e c t i o n T h e n

' Ge t t h e n e x t c o d e / v a l u e p a i r a n d . .c o d e s = R e a d C o d e s' L o o p t h r o u g h t h i s s e c t i o n u n t i l t h e ' E ND S EC'Wh i l e c o d e s ( 1 ) < > " EN DSE C"

' Wh i l e i n a s e c t i o n , a l l ' 0 ' c o d e s i n d i c a t e' a n o b j e c t . I f y o u f i n d a ' 0 ' s t o r e t h e' o b j e c t n a me f o r f u t u r e u s e .I f c o d e s ( 0 ) = " 0 " T h e n l a s t Ob j = c o d e s ( 1 )' I f t h i s o b j e c t i s o n e y o u ' r e i n t e r e s t e d i nI f l a s t Ob j = s t r O b j e c t T h e n

' S u r r o u n d t h e c o d e w i t h c o mma st mp Co d e = " , " & c o d e s ( 0 ) & " , "' I f t h i s c o d e i s i n t h e l i s t o f c o d e s . .I f I n S t r ( s t r C o d e L i s t , t mp C o d e ) T h e n

' Ap p e n d t h e r e t u r n v a l u e .R e a d DX F = Re a d D XF & _

c o d es ( 0 ) & " = " & c o d e s ( 1 ) & v b Cr L fEn d I f

E n d I f' Re a d a n o t h e r c o d e / v a l u e p a i rc o d e s = R e a d Co d e s

We n dE n d I f

E l s ec o d e s = R e a d Co d e s

En d I fW e n dC l o s e # 1

En d F u n c t i o n

' Re a d Co d e s r e a d s t w o l i n e s f r o m a n o p e n f i l e a n d r e t u r n s a t wo i t e m' a r r a y , a g r o u p c o d e an d i t s v a l u e . A s l o n g a s a DX F f i l e i s r e a d' t wo l i n e s a t a t i me , a l l s h o u l d b e f i n e . Ho we v e r , t o ma k e y o u r' c o d e mo r e r e l i a b l e , y o u s h o u l d a d d s o me a d d i t i o n a l e r r o r a n d' s a n i t y c h e c k i n g .

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'F u n c t i o n Re a d Co d es ( ) A s Va r i a n t

D i m c o d e S t r , v a l S t r As S t r i n gL i n e I n p u t # 1 , c o d e S t rL i n e I n p u t # 1 , v a l S t r' T r i m t h e l e a d i n g a n d t r a i l i n g s p a c e f r o m t h e c o d eR e a d Co d es = Ar r a y ( T r i m( c o d e S t r ) , v a l S t r )

En d F u n c t i o n

W riting a DXF File

Writing a program th at creates a DXF file can be mo re difficult than on e th at

reads a DXF file, because you m ust m ain tain con sisten cy with in th e drawing

in ord er for Aut oCAD to fin d t h e file acceptable. Aut oCAD lets you om it

m an y item s in a DXF file an d still obtain a usable drawin g.

s Th e ent ire HEADER section can be om itted if you don ’t set h eader

variables.

s An y of th e t ables in t h e TABLES section can be om itted if you d on ’t n eed

to m ake en tries, an d th e entire TABLES section can be dro pp ed if no th in g

in it is required.s If you define any linetypes in the LTYPE table, this table must appear

befo re t h e LAYER tab le.

s If no block definitions are used in the drawing, the BLOCKS section can

be omitted.

s If presen t, t h e BLOCKS section m ust ap pear b efore th e ENTITIES section.

s Within th e ENTITIES section, you can reference layer nam es even th ou gh

you ha ven ’t d efined th em in th e LAYER table. Such layers are autom ati-

cally created with color 7 an d th e CONTINUOUS linetype.

s The EOF item m ust be present at th e en d of file.

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The followin g Visual Basic subro utin e con structs a DXF file represent ing a

polygon.

' Wr i t e DXF P o l y g o n c r e a t e s a mi n i ma l D X F f i l e t h a t o n l y c o n t a i n s' t h e ENT I T I E S s e c t i o n . T h i s s u b r o u t i n e r e q u i r e s f i v e p a r a me t e r s ,' t h e DX F f i l e n a me , t h e n u mb e r o f s i d e s f o r t h e p o l y g o n , t h e X' a n d Y c o o r d i n a t e s f o r t h e b o t t o m e n d o f t h e r i g h t - mo s t s i d e

' ( i t s t a r t s i n a v e r t i c a l d i r e c t i o n) , a n d t h e l e n g t h f o r e a c h' s i d e . No t e t h a t b e c a u s e t h i s o n l y r e q u e s t s 2 D p o i n t s , i t d o e s' n o t i n c l u d e t h e Z c o o r d i n a t e s ( c o d e s 3 0 a n d 3 1 ) . T h e l i n e s a r e' p l a c e d o n t h e l a y e r " P o l y g o n . "'Su b Wr i t e DX F P o l y g o n ( _

d x f F i l e As S t r i n g , i S i d e s A s I n t e g e r , _ d b l X A s Do u b l e , d b l Y A s Do u b l e , d b l L e n A s Do u b l e )

D i m i A s I n t e g e rD i m d b l A1 , d b l A , d b l P I , d b l N X, d b l NY A s Do u b l eOp e n d x f F i l e F o r Ou t p u t A s # 1P r i n t # 1 , 0P r i n t # 1 , " S EC T I ON"P r i n t # 1 , 2

P r i n t # 1 , " E NT I T I E S"d b l P I = A t n ( 1 ) * 4d b l A 1 = ( 2 * d b l P I ) / i S i d e sd b l A = d b l PI / 2F o r i = 1 To i S i d e s

Pr i n t # 1 , 0Pr i n t # 1 , " L I NE"Pr i n t # 1 , 8Pr i n t # 1 , " Po l y g o n "Pr i n t # 1 , 1 0Pr i n t # 1 , d b l XPr i n t # 1 , 2 0Pr i n t # 1 , d b l Yd b l NX = d b l L e n * Co s ( d b l A) + d b l X

d b l NY = d b l L e n * S i n ( d b l A) + d b l YPr i n t # 1 , 1 1Pr i n t # 1 , d b l NXPr i n t # 1 , 2 1Pr i n t # 1 , d b l NYd b l X = d b l N Xd b l Y = d b l N Yd b l A = d b l A + d b l A 1

N e x t iP r i n t # 1 , 0P r i n t # 1 , " E ND S EC "P r i n t # 1 , 0P r i n t # 1 , " E OF "C l o s e # 1

E n d S u bAs lon g as a properly form atted item appears on the line on which t h e data

is ex pected, DXFIN accepts it. (Of cou rse, string item s should n ot h ave leading

spaces un less th ese are in ten ded to be part of th e strin g.) This BASIC program

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takes advan tage of th is flexibility in in pu t forma t an d d oes not gen erate a file

exactly like on e generated by Auto CAD.

In th e case of an error in using DXFIN to load, AutoCAD repo rts th e error with

a m essage ind icatin g the n ature of the error an d th e last line processed in t h e

DXF file before th e error was detected. This ma y not be th e lin e on wh ich th e

error o ccurred, especially in t h e case of errors such as th e om ission of required group s.

Binary DXF Files

The ASCII DXF file form at is a com plete rep resenta tion of an Auto CAD draw -

in g in an ASCII text form , an d is easily processed by o th er program s. In add i-

tion, Aut oCAD can produ ce or read a b inary form of the full DXF file an d

accept limited in put in ano ther binary file form at.

Th e SAVE an d SAVEAS com m and s provide a Bin ary option that writes bin aryDXF files. Such a file con tain s all of th e in form ation presen t in an ASCII DXF

file bu t in a m ore com pact form th at t akes, typically, 25 percent less file

space. It can be read an d written m ore q uickly (typically, five tim es faster) by

Aut oCAD. Un like ASCII DXF files, wh ich ent ail a trad e-off between size an d

floating-point accuracy, binary DXF files preserve all of the accuracy in the

drawing database. (AutoCAD Release 10 was the first version to support this

form of DXF file; it cannot be read by older versions.)

A binary D XF file begins with a 22-byte sent inel con sistin g of th e following:

Au t o C AD B i n a r y D XF < C R> < L F > < SU B> < NU L L >

Followin g th e sent inel are p airs (group , value) as in an ASCII DXF file but rep -

resen ted in binary form . Th e group co de is a 2-byte binary value (1-byte in

DXF files prior to Aut oCAD Release 14), an d t h e value th at follows is on e of

th e followin g:

s A 2-byte in teger with th e least significant b yte first and th e m ost sign ifi-

cant b yte last

s An 8-byte IEEE do uble-precision floatin g-point n um ber stored with t h e

least sign ifican t byte first an d th e m ost sign ifican t byt e last

s An ASCII string term inated by a 0 (NULL) byte

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Slide Files | 159

Th e type of data following a group is determ in ed from th e group code by th e

same ru les used in d ecodin g ASCII DXF files. Translation of an gles to degrees

an d dates to fraction al Julian dat e represen tation is perform ed for binary

files, as well as for ASCII DXF files. The com m en t grou p, 99 9, is n ot used in

binary DXF files.

Exten ded data grou p codes are represen ted in binary DXF as a single bytewith t he value 255, followed by a 2-byte int eger value con tain in g th e actual

grou p code, followed b y the actu al value.

Exten ded da ta lon g (group code 1071) values occupy 4 bytes of data.

Exten ded da ta bina ry chun ks (group co de 1004) are represen ted as a sin gle-

byte, un signed in teger len gth , followed by th e specified n um ber of bytes of

ch un k data. For example, to t ransfer an extend ed d ata long group, th e fol-

lowin g values would ap pear, occupyin g 1, 2, an d 4 b ytes respectively.

2 5 5 Escape group code 1 0 7 1 True group code 9 9 9 9 9 9 Value for the 1071 group code

SAVEAS writes bina ry DXF files with th e same file type (.dxf) as for ASCII DXF

files. The OPEN an d INSERT com m an ds autom atically recognizes a binary file

by m ean s of its sentin el string. You n eed n ot iden tify it as a binar y file.

If th e OPEN an d INSERT commands encou nt er an erro r in a bin ary DXF file,

Aut oCAD reports th e byte address within th e file where th e error was

detected.

Slide Files

NOT E This information is for experienced programmers, and is subject to

change without notice.

Aut oCAD slide files are screen im ages written by th e MSLIDE command and

read by th e VSLIDE com m an d. This section d escribes the form at of slide files

for th e ben efit of developers who wish to incorp orate suppo rt for slides into

their programs.

A slide file consists of a h eader portion (31 bytes) an d o ne o r m ore data

records of variable length. All coordinates and sizes written to the slide file

reflect th e drawin g area of th e display device from wh ich th e slide was cre-

ated with point (0,0) located at th e lower-left corn er of th e drawing area. For

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Aut oCAD Release 9 an d later, th e slide file h eader con sists of th e followin g

fields:

Data records follow th e h eader. Each dat a record begins with a 2-byte field

who se h igh-order byte is th e record type. The rem ain der of the record m ay

be com po sed of 1-byte or 2-byt e fields as described in t h e followin g table. Todeterm ine wh eth er the 2-byte fields are writt en with th e h igh -order byte first

or th e low-order byte first, exam in e th e Test n um ber field of th e header th at

is described in t h e previous table.

Slide file header

Field Bytes Description

ID string 17 “ AutoCAD Slide” CR LF ̂ Z NUL

Type indicator 1 Current ly set to 56 (decimal)

Level indicator 1 Current ly set to 2

High X dot 2 Width of the graphics area: 1, in pixels

High Y dot 2 Height of the graphics area: 1, in pixels

Aspect ratio 4 Draw ing area aspect rat io (ho rizon tal size/vertical size ininches), scaled by 10,000,000. This value is always written

with the least significant byte first

Hardware fill 2 Either 0 or 2 (value is unimportant)

Test num ber 2 A number (1234 hex) used t o det erm ine w het her all2-byte values in the slide were written with the high-orderbyte first (Intel 8086-family CPUs) or the low-order bytefirst (Motorola 68000-family CPUs)

Slide file data records

Record type(hex) Bytes Meaning Description

00-7F 8 Vector The from-X coordinate for an ordinary vector.From-Y, to-X, and to-Y follow in that order as

2-byte values. The from point is saved as the lastpoint

80-FA — Undefined Reserved for future use

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Slide Files | 161

If a slide con tains an y vectors at all, a New color record will be th e first dat a

record . Th e order of th e vectors in a slide, and th e order of th e en dp oint s of

th ose vectors, m ay vary.

For exam ple, the followin g is an an n otated h ex du m p of a sim ple slide file

created on an IBM PC/AT with an IBM En h an ced Graph ics Adap ter. The slide

con sists of a wh ite diagon al lin e from th e lower-left corn er to th e upper-righ t

corner of t he d rawing area, a green vertical lin e near th e lower-left corn er,

an d a sma ll red rectan gle at th e lower-left corn er.

FB 5 Offset vector The low-order byte and the following threebytes specify the endpoints (from-X, from-Y,

to-X, to-Y) of a vector, in terms of offsets (–128to +127) from the saved last point . The adjustedfrom point is saved as the last point for use bysubsequent vectors

FC 2 End of file The low-order byte is 00

FD 6 Solid fill The low-order byte is always zero. The followingtwo 2-byte values specify t he X and Y coordinates of one vertex of a polygon to besolid filled. Three to ten such records occur insequence. A Solid fill record with a negative Ycoordinate indicates the start or end of such aflood sequence. In the start record, the Xcoordinate indicates the number of vertexrecords to follow

FE 3 Commonendpointvector

This is a vector starting at the last point . Thelow-order byte and t he following byte specifyto-X and to-Y in terms of offsets (–128 to +127)from the saved last point. The adjusted to pointis saved as the last point for use by subsequentvectors

FF 2 New color Subsequent vectors are to be drawn using thecolor number indicated by the low-order byte

Slide file data records (continued )

Record type(hex) Bytes Meaning Description

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Slide Library Files | 163

Note that the o ld-format h eader does not con tain a t est num ber field. Th e

floating-point aspect ratio value and all 2-byte in tegers are writt en in th e

n ative form at of th e CPU th at was used to create th e file (for 8086-family

CPUs, IEEE do uble-precision, an d low -order byt e first). Old-form at slide files

are not portable across m achine t ypes, but th ey can be read by an y version

of Auto CAD run n ing on the sam e CPU type as th e CPU with which t h e slide

was created.

Slide Library FilesThis section describes th e form at o f Aut oCAD slide libraries (Release 9 and

later) for th e ben efit of developers who wish to in corporat e supp ort for slide

libraries in to t h eir pro gram s.

The gen eral forma t of a slide library is as follows:

" A u t o C AD S l i d e L i b r a r y 1 . 0 " CR L F ^ Z NUL NU L NUL NUL Header (32 bytes) One or more slide directory entries (36 bytes each) One or more slides (variable length)

Slide d irectory en tries have th e followin g form at:

Slide name (NUL term inated) (32 bytes) Address of slide within library file (4 bytes)

The slide ad dress is always written with t h e low-ord er byte first. Each slide t o

wh ich th e directory point s is a com plete slide file as described in th e previous

section. The en d o f the slide d irectory is sign ified by an en try with a n ull slide

n am e (first byt e is NUL). A slide library can conta in a m ixture of old-form at

an d n ew-format slides.

Hardware fill 2 Either 0 or 2 (value is unimportant)

Filler byte 1 Unused

Old slide file header (continued )

Field Bytes Description

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16

Advanced DXF Issues

Th is app en dix discusses th e advan ced con cepts related

to DXF™ grou p codes.

In this chapter

s Database Objects

s Persistent Inter-Object

Reference Handles

s Subclass Markerss Extension Dictionary and

Persistent Reactors

s Extended Data

s Object Coordinate Systems

(OCS)

s Arbitrary Axis Algorithm

B

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166 | Appendix B Advanced DXF Issues

Database Objects

AutoCAD® drawings con sist largely of structured con tainers for datab ase

objects. Database objects each h ave th e followin g:

s Han dle whose value is un iqu e to th e drawin g/DXF file, and is constan t forth e lifetime of t he d rawing. This form at h as existed since AutoCAD

Release 10, but a s of Aut oCAD Release 13, h an dles are always en abled.

s Option al xdata t able, just as ent ities have h ad since Auto CAD Release 11.

s Option al persistent reactor table.

s Optional own ership point er to an exten sion dictionary, wh ich in turn

own s subobjects placed in it by an a pplication .

Sym bol tables an d symb ol table records are dat abase ob jects and, t h us, have

a han dle. Th ey can also h ave xdat a and persisten t reactors in th eir DXF

records.

Persistent Inter-Object Reference Handles

A set of group code ran ges perm it ob jects to directly specify references to

oth er objects with in t he sam e drawing/DXF file. Fou r ranges are pro vided for

th e four types of reference ha nd les th at you can specify:

s Soft-pointer handle

s Hard-poin ter hand le

s Soft-owner handle

s Hard-own er han dle

These han dle types are man ifested as en tity n am es in Aut oLISP®, as

ads_nam e values in Ob jectARX™ and as like-n am ed classes derived from

ObjectARX. These values are always maintained in insert, xref, and wblock

operation s such t h at references between objects in a set being copied are

updated t o p oint to the co pied o bjects, while references to ot her ob jects

remain un chan ged.

Also, a group code ran ge for “arbitrary” han dles is defined t o allow con ve-

n ient storage of han dle values th at are not con verted to en tity nam es and

th en tran slated in insert, xref, or wblock.

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Persistent Inter-Object Reference Handles | 167

NOT E If you use 1005 xdata group codes to store handles, they are treated as

soft -point er handles, which means that when groups of objects are copied or

inserted into another drawing, references between the involved objects are

translated. Although 1005 xdata items are always returned as handles in

AutoLISP and ObjectARX, all of the reference handle group code ranges are

represented as “ entity names” in AutoLISP and as ads_name structures inObjectARX.

Pointer and Ownership References

A po int er is a referen ce th at ind icates usage but n ot p ossession or respon si-

bility for another object. Pointer references mean that the object uses the

oth er object in som e way, and sh ares access to it.

An o wn ersh ip referen ce mean s th at an ow ner ob ject is respon sible for th e

objects for which it h as an ow ner h an dle. Ownersh ip referen ces direct the

writin g of th e en tire DWG an d DXF files in a gen eric m an n er, such as begin-n ing from a few key root objects.

An object can h ave any n um ber of po int er references associated with it , but

it can h ave only on e owner.

Hard and Soft References

Hard references, wheth er th ey are pointer or o wner, protect an object from

being pu rged. Soft references do n ot.

In Aut oCAD, block definition s an d com plex entities are ha rd own ers of th eir

elem en ts. A sym bo l tab le an d d iction aries are soft o wn ers of their elemen ts.

Polylin e ent ities are hard o wn ers of their vertex and seqen d ent ities. Insert

entities are hard owners of their attrib and seqend entities.

Wh en establish ing a reference to an oth er object, it is recom m end ed th at you

thin k about wheth er the reference shou ld protect an object from th e PURGE

command.

Arbitrary Handles

Arbitrary h an dles are distinct in th at th ey are no t tran slated t o session persis-

ten t iden tifiers in ternally, to en tity na m es in AutoLISP, an d so on . Th ey arestored as ha ndles. Wh en translation of h and le values are translated in draw-

in g-m erge op eration s, arbitrary h an dles are ign ored.

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In all environm ents, arbitrary h andles can be exchanged for entity n ames of

the current drawing by m eans of th e h a n d e n t fun ctions. A comm on usage of

arbitrary han dles is to refer to ob jects in external DXF an d DW G files.

1005 Group Codes

1005 xdata group cod es have th e sam e behavior an d sem ant ics as soft point-ers, which m eans th at th ey are tran slated wh enever the h ost o bject is m erged

in to a different d rawing. However, 1005 item s are no t tran slated to session-

persistent identifiers, internally entity names in AutoLISP and ObjectARX.

They are stored as h an dles.

Subclass Markers

Wh en filin g a stream of group d ata, a sin gle object m ay be com po sed of sev-

eral filer m em bers, on e for each level of inh eritance wh ere filin g is don e.Since d erived classes an d levels of inh eritan ce can evolve separat ely, th e data

of each class filer m em ber m ust be segregated from ot her m em bers. Th is is

achieved u sin g subclass ma rkers.

All class filer m em bers are expected t o preced e th eir class-specific po rtion of

in stan ce data with a “subclass” m arker—a 100 grou p co de followed b y a

string with t h e actual n am e of the class. This does n ot affect th e state needed

to d efin e th e ob ject’s state, b ut it p rovides a m ean s for t h e DXF file pa rsers to

direct the group codes to th e correspo n ding app lication software.

For exam ple, an ob ject th at h as data from differen t d erived classes would be

represented as follows:

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Subclass Markers | 169

9 9 9F OOGR A NDCHI L D, d e f i n e d b y c l a s s Ac D b So n Of S o n Of F o o , wh i c h9 9 9

i s d e r i v e d f r o m A c Db S o n Of F o o0

F O OGR A N D CH I L D5

C21 0 0A c D b F o o9 9 9Us e s 1 0 / 2 0 / 3 0 g r o u p c o d e s

1 01 . 1

2 02 . 3

3 07 . 31 0 0Ac D bS o n Of F o o9 9 9Al s o u s e s 1 0 / 2 0 / 3 0 g r o u p c o d e s , f o r a d i f f e r e n t p u r p o s e

1 01 . 1

2 02 . 3

3 07 . 31 0 0Ac D bS o n Of S o n Of F o o9 9 9Al s o u s e s 1 0 / 2 0 / 3 0 g r o u p c o d e s , f o r y e t a n o t h e r p u r p o s e

1 01 3 . 2

2 02 3 . 1

3 03 1 . 29 9 9No w f o r t h e Xd a t a1 0 0 1A P P _ 11 0 7 04 51 0 0 1A P P _ 21 0 0 41 8 A 5 B 3 E F 2 C 1 9 9 A

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Extension Dictionary and Persistent Reactors

Th e exten sion d iction ary is an o ptional sequen ce th at stores the h and le of a

dictionary object th at belongs to the current object, wh ich in tu rn m ay con -

tain en tries. Th is facility allows attach m en t of arbitrary database ob jects to

an y database object. An y object or en tity m ay ha ve this section .

Persistent reactors are an o ption al sequ en ce that stores object h an dles of

objects registering th em selves as reactors on th e current ob ject. An y object or

entity m ay have this section.

Extended Data

Exten ded data (xd ata) is created by Auto LISP or ObjectARX app lication s. If

an en tity con tains extend ed data, it follows the en tity’s n orm al defin ition

data. The grou p codes 1000 th rough 1071 describe exten ded data. The fol-

lowing is an example of an entity containing exten ded data in DXF form at.

Normal entity definition data:

0I N S ER T

5F 1 11 0 0Ac D b E n t i t y

8T OP

1 0 0Ac D bB l o c k Re f e r e n c e2

B L O C K _ A1 0

0 . 02 0

0 . 03 0

0 . 0

Extended entity definition data:

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Extended Data | 171

1 0 0 1A ME _ S OL1 0 0 2{1 0 7 0

01 0 7 1

1 . 9 5 0 5 9 E+ 0 61 0 7 0

5 1 91 0 1 02 . 5 4 7 1 71 0 2 02 . 1 2 2 6 4 21 0 3 02 . 0 4 9 2 0 11 0 0 5EC D1 0 0 5EE 91 0 0 501 0 4 00 . 01 0 4 01 . 01 0 0 0MI L D _ S T E EL

Th e group code 1001 indicates the beginn ing of extended data. In contrast

to n orm al ent ity data, with extended data th e same group code can appear

multiple times, an d order is imp ortant.

Exten ded data are group ed by registered application n am e. Each registered

app lication’s grou p begins with a 1001 group code with th e application

n am e as th e string value. Registered application n am es correspo n d to APPIDsym bol t able entries.

An app lication can use as man y APPID n am es as n eeded. APPID n am es are

perm anen t, alth ough they can b e purged if th ey aren’t currently used in th e

drawing. Each APPID nam e can h ave n o m ore th an o n e data group attached

to each en tity. Within an application ’s group, th e sequence of exten ded d ata

groups and th eir m eanin g is defined by the app lication .

The extend ed dat a grou p co des are listed in th e following table.

Extended data group codes and descriptions

Entity name Group code Description

String 1000 Strings in extended data can be up to 255 bytes long (with the256th byte reserved for the null character)

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App lication name 1001also a stringvalue

Application names can be up to 31 bytes long (the 32nd byte isreserved for the null character).

NOTE Do not add a 1001 group into your extended data because

AutoCAD assumes it is the beginning of a new applicat ionextended data group

Cont rol st ring 1002 An extended dat a cont rol st ring can be eit her “ {” or “ }” . Thesebraces enable appl icat ions to organize their data by subdividingthe data into lists. The left brace begins a list, and the right braceterminates the most recent list. Lists can be nested.When AutoCAD reads the extended data for a particularapplication, it checks to ensure that braces are balanced

Layer name 1003 Name of the layer associated with the extended data

Binary data 1004 Binary data is organized into variable-length chunks . The maximum

length of each chunk is 127 bytes. In ASCII DXF files, binary data isrepresented as a str ing of hexadecimal digits, two per binary byte

Database hand le 1005 Hand les of en tities in th e d rawing d atab ase

NOTE When a drawing with handles and extended data handlesis imported into another drawing using INSERT, INSERT *, XREFBind, XBIND, or partial OPEN, the extended data handles aretranslated in the same manner as their corresponding entityhandles, thus maintaining their binding. This is also done in theEXPLODE block operation or for any other AutoCAD operation.When AUDIT detects an extended data handle that doesn’t matchthe handle of an entity in the drawing file, it is considered an error.If AUDIT is fixing entit ies, it sets the handle to 0

3 reals 1010, 1020,1030

Three real values, in the order X , Y , Z . They can be used as a pointor vector record. AutoCAD never alters their value

World space position 1011, 1021,1031

Unlike a simp le 3D point , the world space coordinates are moved,scaled, rotated, and mirrored along wit h the parent entity to whichthe extended data belongs. The world space position is alsostretched when the STRETCH command is applied to the parentent ity and t his point lies within th e select window

World spacedisplacement

1012, 1022,1032

Also a 3D point that is scaled, rot ated, and mirrored along with theparent (but is not moved or stretched)

World direct ion 1013, 1023,1033

Also a 3D point that is rotated and m irrored along with th e parent(but is not moved, scaled, or stretched)

Real 1040 A real value

Distance 1041 A real value that is scaled along with the parent ent ity

Extended data group codes and descriptions (continued )


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Object Coordinate Systems (OCS) | 173

Object Coordinate Systems (OCS)

To save space in th e drawin g dat abase (and in th e DXF file), the p oint s

associated with each en tity are expressed in t erm s of th e ent ity’s own object

coord inat e system (OCS). The OCS was referred to as ECS in previous releases

of Auto CAD. With OCS, th e only addition al inform ation n eeded to describeth e ent ity’s position in 3D space is th e 3D vecto r describing th e Z axis of th e

OCS, and t he elevation value.

For a given Z axis (or extrusion ) direction , th ere are an infinite n um ber of

coordin ate system s, defin ed by tran slating th e origin in 3 D space an d by

rotatin g the X an d Y axes around t h e Z axis. However, for th e sam e Z axis

direction, th ere is on ly on e OCS. It h as the following prop erties:

s Its origin coincides with th e WCS origin.

s Th e orient ation of th e X an d Y axes within t h e XY plane a re calculated in

an arbitrary but consistent manner. AutoCAD performs this calculation

using th e arbitrary axis algorith m (see “Arbitrary Axis Algorith m ” on page175).

For som e en tities, the O CS is equ ivalen t t o th e WCS an d all poin ts (DXF

grou ps 10–37) are expressed in world coo rdinat es. See th e following ta ble.

Scale factor 1042 Also a real value t hat is scaled along wit h th e paren t. The differencebetween a distance and a scale factor is application-defined

Integer 1070 A 16-bit integer (signed or unsigned)

Long 1071 A 32-bit signed (long) integer

Coordinate systems associated with an entity type

Entities Notes

3D entit ies such as line, point,3dface, 3D polyline, 3D vertex,

3D mesh, 3D mesh vertex

These entities do not lie in a particular plane. All pointsare expressed in world coordinates. Of t hese ent it ies,

only lines and po ints can be extruded. Their extrusiondirect ion can differ from the world Z axis

Extended data group codes and descriptions (continued )


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On ce AutoCAD has establish ed t h e OCS for a given ent ity, th e OCS works as

follows: The elevation value stored with an en tity in dicates h ow far to shift

th e XY plane along th e Z axis (from th e WCS origin ) to m ake it coincide with

the p lane th at cont ains the en tity. How mu ch of th is is the u ser-defined ele-

vation is unimportant.An y 2D points entered th rough t h e UCS are transformed in to th e corre-

spo nd in g 2D point s in th e OCS, which is sh ifted an d rotated with respect to

th e UCS.

Th ese are a few ram ification s of th is process:

s You can n ot reliably fin d out wh at UCS was in effect wh en an en tity was

acquired.

s Wh en you en ter the XY coordinates of an ent ity in a given UCS and then

do a SAVEAS, you pro bably won’t recogn ize tho se X Y coordinates in t h e

DXF file. You m ust kn ow th e m eth od by wh ich Aut oCAD calculates th e X an d Y axes in order to wo rk with th ese values.

s The elevation value stored with an en tity an d outp ut in DXF files is a sum

of th e Z -coordin ate differen ce between t h e UCS XY plane and the OCS XY

plan e, and the elevation value th at th e user specified at th e time th e entity

was drawn .

2D entities such as circle, arc,solid, t race, text , attrib, attdef,shape, insert, 2D polyline, 2D

vertex, lwpolyline, hatch, image

These entities are planar in nature. All points areexpressed in object coordinates. All of these entities canbe extruded. Their extrusion direction can differ from

the world Z axis

Dimension Some of a dimension’s points are expressed in WCS andsome in OCS

Viewport Expressed in world coordinates

Coordinate systems associated with an entity type (continued )

Entities Notes

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Index

*Mod el_Spa ce blo ck d efinit io n , 57*Paper_Space block definition , 572D en tities, coordin ate system s associated with ,

17 43D en tities, coordin ate system s associated with ,

17 33dface group cod es, 623dsolid grou p codes, 63

Aacad_proxy_entity grou p codes, 63ACAD_PROXY_OBJECT group codes, 117ACADMAINTVER DXF system variable, 16ACADVER DXF system varia ble, 16ACDBDICTION ARYWDFLT gro u p codes, 118ACDBPLACEHOLDER group codes, 11 9aligned dimension group codes, 71ANGBASE DXF system varia ble , 16ANGDIR DXF system variable, 16angular dimen sion group codes, 74anon ymo us blocks, 5 6APPID group codes , 38

xdata groupings an d , 17 1application -defin ed o bject types, 11 6arbitrary a xis algorith m , 1 75arbitrary handles, 1 66arc edge data for hat ch en tities, 81arc group codes, 6 4ASCII con tro l cha racters in DXF files, 147ASCII DXF files

about, 14 5vs. bin ar y DXF files, 158BLOC KS section (exam ple), 1 52CLASSES section (exam ple) , 14 8

control character handling, 14 7ENTITIES sectio n (exam ple), 15 3HEADER section (example), 148m aximum file string length , 147OBJECTS sect ion (example), 15 3reading (example), 15 4section s of , 146structu re of , 146TABLES section (example), 149writing (examp le), 15 6

attdef group codes, 65ATTMODE DXF system variable, 16attrib group codes, 66

AUNITS DXF system variab le, 16AUPREC DXF system variab le, 16AutoLISP

arbitrary h andles and , 16 7entnext funct ion output for ole2fram e entity

(example), 96grou p code 1005 xd ata items an d , 1 68handent function , 16 8reference h and les an d , 166 , 16 7

Bbin ary DXF files, 14 5 , 158block definitions

about , 56Model_Space an d Paper_Space , 57UCS/WCS and , 57

block group codes, 56block referen ce (inser t) group codes, 85block table han dles, 56BLOCK_RECORD group codes, 39BLOCKS section

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178 | Index

about, 55 , 147examp le of , 15 2group codes in , 56and writin g a DXF file, 156

blocks, anon ymo us, 56body grou p codes, 68boun dary path data for hatch entities, 8 0

CC++ class n am es, default class valu es, 33CECOLOR DXF system variable, 16CELTSCALE DXF system varia ble , 16CELTYPE DXF syst em var iable , 16CELWEIGHT DXF system variable, 16CEPSNTYPE DXF system varia b le, 16CHAMFERA DXF syste m varia b le, 16CHAMFERB DXF system varia ble , 16CHAMFERC DXF system variable , 17CHAMFERD DXF system variable, 17circle grou p codes, 69

CLASSES sectionabout, 31 , 146default class values by DXF record n ame and

C++ class n ame, 3 3group codes in , 32

CLAYER DXF system varia b le, 17CMLJUST DXF system variable, 17CMLSCALE DXF system varia b le, 17CMLSTYLE DXF system var iable, 17comm on entity group codes, 60contr ol ch aracter han dlin g, 14 7conven tion s used in t h is reference, 6coordinate systems associated with entity typ es,

17 3

CPSNID DXF system variable, 16

Ddatabase objects, 16 6default class values by DXF record nam e an d C++

class nam e, 33deleted items in symbol tables, 36diameter dimen sion group codes, 73diction aries, nam ed object, 116DICTION ARY gro up cod es, 12 0DICTION ARYVAR gro up codes, 121 , 122DIMADEC DXF system variable, 17DIMALT DXF system varia b le, 1 7

DIMALTD DXF system variable, 17DIMALTF DXF system variable, 17DIMALTRND D XF system va riable, 17DIMALTTD D XF syste m var iable, 17DIMALTTZ DXF syst em var iable , 17DIMALTU D XF system variable, 17DIMALTZ DXF system variable, 17DIMAPOST DXF system variab le, 17

DIMASO DX F system variab le, 18DIMASZ DXF system var iable, 18DIMATFIT DXF syste m variable , 18DIMAUNIT DXF syste m var iable, 18DIMAZIN DXF system variable, 18DIMBLK DXF system variable, 18DIMBLK1 DXF system variab le, 18DIMBLK2 DXF system variab le, 18DIMCEN DXF system variable , 18DIMCLRD DXF system variable, 18DIMCLRE DXF syst em varia ble, 18DIMCLRT DXF system variab le, 18DIMDEC DXF system variable, 18DIMDLE DXF system variab le, 18DIMDLI DXF syst em v ariab le, 18DIMDSEP DXF system variab le, 19dimen sion entities, coord in ate system s associated

with , 17 4dimen sion group codes, 69

align ed , 71angular, 74common, 69diameter, 73linear , 72ordinate, 75radial, 7 3rotated, 72

dimen sion style overrides, 76DIMEXE DXF system va riable, 19DIMEXO DXF system variable, 19DIMFRAC DXF system variab le, 19DIMGAP DXF system variable , 19DIMJUST DXF system variable , 19DIMLDRBLK DXF system varia ble, 19DIMLFAC DXF system variab le, 19DIMLIM DXF system variab le, 1 9DIMLUN IT DXF system variable, 19DIMLWD DXF system variable , 19DIMLWE DXF system var iable, 19DIMPOST DXF system variab le, 19DIMRND DXF system variable, 19DIMSAH DXF system variable, 19DIMSCALE DXF system varia b le, 2 0DIMSD1 DXF system variable , 20DIMSD2 DXF system variable , 20DIMSE1 D XF system var iable, 20DIMSE2 D XF system var iable, 20DIMSHO DXF system variable , 20DIMSOXD DXF system variable , 20DIMSTYLE

table handle code, 3 6DIMSTYLE DXF system variable, 20DIMSTYLE group codes, 40DIMSTYLE tab le h an dle code , 36DIMTAD DXF syste m var iable, 20DIMTDEC DXF system variable, 20DIMTFAC D XF syst em var iable, 20

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Index | 179

DIMTIH DXF system variable, 2 0DIMTIX DXF syste m v ariab le, 20DIMTM DXF system v ariab le, 20DIMTMOVE DXF system variable, 20DIMTOFL DXF system varia ble, 20DIMTOH DXF system variable, 20DIMTOL DXF system variable, 20DIMTOLJ DXF system variable, 20DIMTP DXF system variable, 21DIMTSZ DXF system varia ble, 2 1DIMTVP DXF system var iable, 21DIMTXSTY DXF system varia b le, 21DIMTXT DXF system variable, 21DIMTZIN DXF system variable, 21DIMUPT DXF system variable, 21DIMZIN DXF system variable , 21DISPSILH D XF syste m varia ble, 21drawing in terch ange f ile form ats

ASCII DXF, 14 5 , 146bin ary DXF, 1 45, 1 58Slide (SLD), 15 9Slide Library (SLB), 16 3

DWG CO DEPAGE DXF syst em var iable, 21DXF

conventionsgrou p code ranges, 7grou p codes in n um erical order, 9

file pa rsers, sub class mar kers an d , 16 8files. See ASCII DXF files; bin ary DXF filesformat

about, 5interface program s, writing (exam ple), 154record n ames, def ault class values, 33system variables, 16

DXFIN consid eration s for writin g DXF files, 15 7

EECS. See object coordinate systemELEVATION DXF system var iable , 21elevation value for entity po sitionin g, 173ellipse edge d ata for h atch en tities, 82ellipse group codes, 76elliptical arc defin itio n , 77end blk grou p codes, 58ENDCAPS DXF system variab le, 21entities

block , 56coordinate system s associat ed with , 173

endblk , 56entity group cod es vs. object codes, 6grou p codes listed in n um erical order, 9

ENTITIES sectio nabout, 59 , 147and writin g a DXF file, 156

extension diction ary, 170EXTMAX DXF system variab le, 21

EXTMIN DXF system variable, 21EXTNAMES DXF syste m variable , 22extrusion direction, OCS properties for, 17 3

FFASTZ revised VPORT h ead er variab le, 28

filing a stream of group data, subclass markersan d , 168FILLETRAD DXF system varia ble, 22FILLMOD E DXF system variab le, 22FINGERPRINTGU ID DXF syste m varia ble , 22

Ggetvar AutoLISP function , 148graph ical object group codes. See nam es of specific

objectsGRIDMO DE revised VPORT h ead er variable, 28GRIDUNIT revised VPORT hea d er variable , 28grou p codes

about , 14 6arbitrary han dle ran ge, 16 6ASCII DXF files an d , 1 47bin ary DXF files and , 158for ent ities (graphical objects), 60examples of , 148formattin g con vention s for, 6in numerical order, 9objects/entities an d , 6ranges of , 7referen ce h andle ranges, 166for xdata , 17 1

grou p dat a, subclass m arkers and , 16 8GROUP group codes, 12 4

Hhan den t fun ctions (AutoLISP), 168handles

about , 16 6arbitrary, 166of diction ary objects, 17 0referen ce, 16 6

HAND SEED D XF syst em var iable, 22har d references vs. sof t references, 1 67hard-owner hand les, 166hard-pointer han dles, 166hatch group codes, 78

hatch pattern data, 83HEADER sect io n

about , 15 , 146examp le of , 14 8grou p cod es for revised VPORT variables, 27group codes for saved DXF system

variables, 16

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Index | 181

pointer references vs. own ership references, 16 7polyface mesh es in DXF, 98polyline boun dary data for hat ch en tities, 8 1polyline group cod es, 97

polyface m eshes and , 98PROXYGRAPHICS DXF syst em var iable, 23PSLTSCALE DXF system variab le, 23PSVPSCALE DXF syst em va riable , 24PUCSBASE DXF system varia b le, 24PUCSNAME DXF system variab le, 2 4PUCSORG DXF system variable , 24PUCSORGBACK DXF system variab le, 2 4PUCSORGBOTTOM DXF system variable, 24PUCSORGFRONT DXF system variable , 24PUCSORGLEFT DXF syste m v ar iable , 24PUCSORGRIGHT DXF system variable, 24PUCSORGTOP DXF system variable , 24PUCSORTHOREF DXF system variab le, 2 4PUCSORTHOVIEW DXF system variable , 24PUCSXDIR DXF system varia ble, 24PUCSYDIR DXF system va riable, 24

QQTEXTMODE DXF system variable, 25

Rradial dimension group codes, 73ranges of group codes, 7RASTERVARIABLES group codes, 13 5ray group codes, 99readin g a DXF file (exam ple), 154reference h and les

har d vs. soft, 167

pointer vs. ownership , 16 7types of , 16 6

REGENMO DE DXF system variable, 25region group codes, 99rotated dimension group codes, 72

SSAVE com m an d

Binary o ption , 158Select Objects op tion , 14 7

SAVEAS com m an dASCII con tro l charact er h andling and , 14 7bin ary DXF files an d , 15 9

Binary o ption , 158Select Objects op tion , 14 7

sequ end group cod es, 100SHADEDGE DXF syste m var iable, 25SHADEDIF DXF system variable, 25sh ape group codes, 100SKETCHINC DXF system variable , 25

SKPO LY DXF system varia ble , 25slide (SLD) files

about , 15 9data record types, 160header format, 15 9hex d ump of (exam ple), 16 1old-format h eader, 16 2vecto rs an d , 160

slid e libra ry (SLB) file form at , 16 3SNAPANG revised VPORT hea d er var iable, 28SNAPBASE revised VPORT h eader va riab le, 28SNAPISOPAIR revised VPORT header var iab le, 28SNAPMOD E revised VPORT he ader v ariab le, 2 8SNAPSTYLE revised VPORT header variable, 28SNAPUNIT revised VPORT h ead er variable, 28soft referen ces vs. h ard references, 1 67soft-owner handles, 166soft-pointer handles, 16 6, 167solid group codes, 10 1SORTENTSTABLE group codes, 13 8SPATIAL_FILTER grou p cod es, 13 7SPATIAL_IND EX gro u p cod es, 136SPLFRAME DXF system varia ble , 25spline edge data for hatch ent ities, 82spline group codes, 10 2SPLINESEGS DXF system variab le, 2 5SPLINETYPE DXF system variable, 25STYLE group codes, 46subclass m arkers, 168SURFTAB1 DXF system var iable , 25SURFTAB2 DXF system var iable , 25SURFTYPE DXF syste m variab le, 25SURFU DXF system variable , 25SURFV DXF system varia ble , 25sym bol table en tries

common grou p codes, 37structu re of , 36

sym bol t ablescomm on group codes , 36deleted items an d , 3 6DIMSTYLE h andle, 36han dles and , 16 6identifying, 36structu re of , 36

system variables, saved in DXF files, 1 6

TTABLES sec t ion

about , 35 , 146examp le of , 14 9symb ol table com mo n group codes, 36symb ol table structur e, 36and writin g a DXF file, 156

tagged d ata, 5TDCREATE DXF system variable, 25TDINDWG D XF system variable, 25

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TDUCREATE DXF system variable , 25TDUPDATE DXF syst em varia ble, 25TDUSRTIMER DXF system var iable , 25TDUUPDATE DXF system variable , 26text group codes, 103TEXTSIZE DXF system varia ble, 26TEXTSTYLE DXF system variable , 26THICKNESS DXF syste m varia b le, 26THUMBNAIL section

about, 14 7THUMBNAILIMAGE

grou p codes, 144THUMBNAILIMAGE section

about, 14 3TILEMO DE DXF syste m var iable, 26time/ date variables, h an dlin g of , 28toleran ce group co des, 1 05TRACE DXF system variable, 26trace group codes, 10 6TREEDEPTH DXF system varia b le, 2 6

UUCS group codes, 47

vertex group codes, 107VIEW grou p cod es, 49VIEWC TR revised VPORT hea der v ariab le, 28VIEWD IR revised VPORT h ead er variab le, 28viewport en tities

coordinate system s associated with , 174viewport group codes, 1 09VIEWSIZE revised VPORT header variable, 28VISRETAIN DXF system varia b le, 27Visual Basic programs (exam ples)

for readin g a DXF file, 1 54for writing a DXF file, 1 57

VPORT group codes , 51VPORT header variables, revised , 27VSLIDE/MSLIDE co m m an ds, 15 9

Wworld coordinate system (W CS), 173WO RLDVIEW D XF syste m var iable, 27writing a DXF file (exam ple), 1 56

X

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