12/12/2017 scratchweb.engr.oregonstate.edu/~mjb/scratch/scratchintro.2pp.pdf12/12/2017 2 mjb...
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12/12/2017
1
mjb – December 12, 2017
Oregon State UniversityComputer Graphics
Scratch !
Mike Bailey
mjb@cs.oregonstate.edu
Oregon State University
http://cs.oregonstate.edu/ mjb/scratch~
mjb – December 12, 2017
Oregon State UniversityComputer Graphics
What Kind of People Need to Tell the Computer Where to Put Things?
12/12/2017
2
mjb – December 12, 2017
Oregon State UniversityComputer Graphics
Programming from Left-to-Right
mjb – December 12, 2017
Oregon State UniversityComputer Graphics
Programming from Top-to-Bottom
12/12/2017
3
mjb – December 12, 2017
http://www.skirtsandscuffs.com/2011_03_01_archive.html
When the Green Flag gets waved, what happens?
mjb – December 12, 2017
Oregon State UniversityComputer Graphics
12/12/2017
4
mjb – December 12, 2017
Oregon State UniversityComputer Graphics
Stand Up
mjb – December 12, 2017
Oregon State UniversityComputer Graphics
Stand Up
Raise Your Left Hand
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mjb – December 12, 2017
Oregon State UniversityComputer Graphics
Stand Up
Raise Your Left Hand
Put Your Right Hand on Top of Your Head
mjb – December 12, 2017
Oregon State UniversityComputer Graphics
Stand Up
Raise Your Left Hand
Put Your Right Hand on Top of Your Head
Turn Around One Circle
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mjb – December 12, 2017
Oregon State UniversityComputer Graphics
Stand Up
Raise Your Left Hand
Put Your Right Hand on Top of Your Head
Turn Around One Circle
Meow Like a Cat
Count to 2
Repeat 3 Times
mjb – December 12, 2017
Oregon State UniversityComputer Graphics
Stand Up
Raise Your Left Hand
Put Your Right Hand on Top of Your Head
Turn Around One Circle
Put Your Hands Down
Meow Like a Cat
Count to 2
Repeat 3 Times
12/12/2017
7
mjb – December 12, 2017
Oregon State UniversityComputer Graphics
Stand Up
Raise Your Left Hand
Put Your Right Hand on Top of Your Head
Turn Around One Circle
Put Your Hands Down
Sit Down
Meow Like a Cat
Count to 2
Repeat 3 Times
mjb – December 12, 2017
Oregon State UniversityComputer Graphics
Stand Up
Raise Your Left Hand
Put Your Right Hand on Top of Your Head
Turn Around One Circle
Put Your Hands Down
Sit Down
Smile !
Meow Like a Cat
Count to 2
Repeat 3 Times
12/12/2017
8
mjb – December 12, 2017
Oregon State UniversityComputer Graphics
X
Y
mjb – December 12, 2017
Oregon State UniversityComputer Graphics
X
Y
100 200
100
00
12/12/2017
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mjb – December 12, 2017
Oregon State UniversityComputer Graphics
X
Y
100 200
100
00
mjb – December 12, 2017
Oregon State UniversityComputer Graphics
X
Y
-100-200
-100
200
100
100
12/12/2017
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mjb – December 12, 2017
Oregon State UniversityComputer Graphics
X
Y
100 200
100
-100-200
-100
mjb – December 12, 2017
Oregon State UniversityComputer Graphics
Scratch Screen Layout
Script Area“Stage” (i.e., the scene)
CommandCategories
CommandsSprite Manipulation
Sprite Selection(the “waiting room”)
Run your Program!
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mjb – December 12, 2017
1. Green Flag puzzle piece3 Glide pieces
2. Additional actors3 Glides for each
3. Glides in a forever loop
4. Turn (rotate) and Change size
5. Turn (rotate) and Change size in Forever loops
6. Multiple Green Flags
7. Background
8. Sound
A Good Order to Start Doing Things In
mjb – December 12, 2017
Oregon State UniversityComputer Graphics
12/12/2017
12
mjb – December 12, 2017
Oregon State UniversityComputer Graphics
Move an Actor
mjb – December 12, 2017
Oregon State UniversityComputer Graphics
Keep an Actor Moving
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mjb – December 12, 2017
Oregon State UniversityComputer Graphics
mjb – December 12, 2017
Oregon State UniversityComputer Graphics
Keep an Actor Spinning
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mjb – December 12, 2017
Oregon State UniversityComputer Graphics
Keep an Actor Changing Size
mjb – December 12, 2017
http://www.skirtsandscuffs.com/2011_03_01_archive.html
When the Green Flag gets waved,does only one car get to start, or all of them?
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mjb – December 12, 2017
When the Green Flag gets waved,does only one program get to start, or all of them?
mjb – December 12, 2017
Oregon State UniversityComputer Graphics
12/12/2017
16
mjb – December 12, 2017
Oregon State UniversityComputer Graphics
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