The document discusses Processing concepts like recursion, drawing shapes with beginShape(), vertex(), and endShape(), and translation and rotation methods like translate(), rotate(), pushMatrix(), and popMatrix(). It also covers more specific rotation methods around the x, y, and z axes (rotateX(), rotateY(), rotateZ()), scaling with scale(), and using pushMatrix() and popMatrix() before and after transformations to treat shapes as individual entities. Examples are provided on square rotation and a "Guilty Pleasure" demo. Readers are assigned to review images content for next time.

1. From last time…
• Briefly saw recursion!
• Drew arbitrary shapes with beginShape(),
vertex(), and endShape()
• Saw lots of methods that simulate 3D:!
! translate() and rotate()!
! pushMatrix() and popMatrix()

2. git/GithubPro Git, Scott Chacon!
http://git-scm.com/book

3. –Former Co-Worker
“Unless you have a hacksaw or a screwdriver,
you can’t break anything…”

4. CAP
Translation &!
Rotation II

5. Rotation & Scaling
• ‘Simple’ rotation (rotate()) implies 2D rotation,
i.e. rotating around the z-axis!
• rotateX() // around the x axis
• rotateY() // around the y axis
• rotateZ() // around the z axis
• scale()

6. Demo!
Square Rotation

7. Learning Processing, p. 246
“A nice rule of thumb… is to use pushMatrix()
and popMatrix() before and after translation and
rotation for all shapes so that they can be
treated as individual entities.”

8. Demo!
Guilty Pleasure
https://www.youtube.com/watch?v=Eje28TK4D00

9. For next time…
• Read Shiffman, pp. 255–264, Images I