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Assignment 4

2011

CSE 455

COMPUTER GRAPHICS

SUBMITTED BY:

MANMEET SINGH

RA1805A24

SUBMITTED TO:

MR NAVNEET MALIK

DEPTT OF CSE

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PART-AQ1.Aplly text clipping with all methods for the following diagram.

Ans:Text clipping are done in 3 ways which are as follows:

1)string based clipping: the whole string is cut out or clipped off from the screen .

2) character based clipping: an alphabet or a character is clipped off from theclipping window.

3) component based clipping: an alphabet , a letter is considered as component and

which ever portion is required is clipped off from the window.

Character based clipping

String based clipping

INDIA IS MY

COUNTRY

INDIA IS MY COUNTRYINDIA IS MY

COUNTR Y INDIA

IS M

INDIA IS MY

INDIA IS MY

COUNTRY

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Component based clipping

Q2.For the following diagram which clipping method do we use, and apply the

clipping for the following polygon.

AFTER CLIPPING :-

FOR THE GIVEN CONDITION WE CAN USE SUTHERLAND HODGMAN BECAUSE THE

DIAGRAM IS THE CONVEX FIGURE WHICH DONT HAVE MANY CURVES SO IT WILL BE

FEASIBLE TO USE THE SUTHERLAND HODGMAN

PART-B

Q4. Write a program for shear an object with respect to any of three coordinateaxes,using input values for shearing perameters.

Ans:

COUNTR Y INDIA

IS M

INDIA IS MY

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A PROGRAM :

#include

#include

#include

#include

int ch,x,y,az,i,w,ch1,ch2,xa,ya,ra,a[10],b[10],da,db;

float x1,y1,az1,w1,dx,dy,theta,x1s,y1s,sx,sy,a1[10],b1[10];

void main()

{

int gm ,gr;

clrscr();

detectgraph(&gm,&gr);

initgraph(&gm,&gr,"d:\\tc\\BGI");

printf("Enter the upper left corner of the rectangle:\n");

scanf("%d%d",&x,&y);

printf("Enter the lower right corner of the rectangle:\n");scanf("%d%d",&az,&w);

rectangle(x,y,az,w);

da=az-x;

db=w-y;

a[0]=x;

b[0]=y;

a[1]=x+da;

b[1]=y;

a[2]=x+da;

b[2]=y+db;

a[3]=x;b[3]=y+db;

while(1)

{

printf("******2D Transformations*******\n");

printf("1.Translation\n2.Rotation\n3.Scaling\n4.Reflection\n5.Shearing\n6.Exit\nEnter your choice:\n");

scanf("%d",&ch);

switch(ch)

{

case 1:

detectgraph(&gm,&gr);

initgraph(&gm,&gr,"d:\\tc\\BGI");rectangle(x,y,az,w);

printf("*******Translation*******\n\n");

printf("Enter the value of shift vector:\n");

scanf("%f%f",&dx,&dy);

x1=x+dx;

y1=y+dy;

az1=az+dx;

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w1=w+dy;

rectangle(x1,y1,az1,w1);

break;

case 2:

detectgraph(&gm,&gr);

initgraph(&gm,&gr,"d:\\tc\\BGI");rectangle(x,y,az,w);

printf("*******Rotation*******\n\n");

printf("Enter the value of fixed point and angle of rotation:Enter the value of fixed point and angle of

rotation:\n");

scanf("%d%d%d",&xa,&ya,&ra);

theta=(float)(ra*(3.14/180));

for(i=0;i

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scanf("%d",&ch1);

switch(ch1)

{

case 1:

printf("Enter the fixed point\n");

scanf("%d%d",&xa,&ya);theta=(float)(90*(3.14/180));

for(i=0;i

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b1[i]=(ya+((-a[i]-xa)*sin(theta)+(-b[i]-ya)*cos(theta)));

}

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}

getch();

}

Q5. Apply 3d clipping for the following object.

Window size is (Xmin,Ymin,Zmin)=(3,1,2) (Xmax,Ymax,Zmax)=(12,6,6) object size

is (Xmin,Ymin,Zmin)=(9,2,3),(Xmax,Ymax,Zmax)=(15,5,5).

Q6.Differentiate between interior clipping and exterior clipping with example.

1)interior clipping

# whatever is to be saved is inside the clip window we only consider the points that

are inside the window

Clipping

window

Object

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