|
|
Simple Animations
Simple animation can be made in logo using the following methods:
- Rotating an object in 2D- Rotating an object in 3D- Creating an animated gif file
Rotating an object in 2D
Step 1: An object is drawn Step 2: The Computer waits some milliseconds Step 3: The object is erased Step 4: The turtle moves Step 5: Go back to step 1 until completion
In the example below the computer rotates a pentagon:
TO pentagon CS REPEAT 360 ~ [ PENERASE REPEAT 5 [FD 100 RT 72] RT 1 PENPAINT REPEAT 5 [FD 100 RT 72] WAIT 1 ] END
Rotating an object in 3D
Step 1: An object is drawn in 3D Step 2: The Computer waits some milliseconds Step 3: The turtle is repositioned Step 4: The Screen is cleared but the turtle is not reset Step 5: Go back to step 1 until completion
In the example below the computer rotates a box:
TO BOX PERSPECTIVE CS REPEAT 30 ~ [ SETTURTLE -1 ARC2 12 1000 SETTURTLE 0 CS REPEAT 4 ~ [ REPEAT 4 [FD 100 RT 90] FD 100 DOWN 90 ] WAIT 3 ] WRAP END
| |||||||||||||||
