CS141: Topics for Feb 10, 12, & 14, 2014

• Exam postponed due to snow until this week - Monday

• Lab: Begin Lab 3: Frieze Patterns. This will be due Fri, Feb 21.

• Symmetry examples

• Programming Elements for this Week

  • Modularizing code.
  • Functions with parameters.
  • Transformations: translate, rotate, scale.
    • Rotation and the fixed point (or pivot).
    • Scaling and the fixed point (or pivot).
    • Rotation, Translate, and Scale combined.
  • Matrix Stack.
    • What is a stack? Last-in, First-out (LIFO)
    • What is a matrix stack?
    • Sequence in code matters!
    • See practice exercise (pdf)
    • See practice exercise - loop (pdf)

• Transformations can be used to create symmetry designs:

  • M. C. Escher
  • Islamic Geometric Art