Computer Science 110 The Art & Science of Computer Graphics Mount Holyoke College Spring 2008

Agenda

• Announcements
• Grading status
• Shared model repository status
• Programming basics
  • mathematical functions
  • a better random number function
  • list manipulations
  • conditional execution
  • building a scene with replicated objects

Lecture Assignment

Due at the start of class, Monday, March 31.

Fill in the function definitions below. Please turn in a hard copy (typeset or handwritten are OK). We will discuss these questions during class, so no late submissions are accepted.

1. A function to return a darker shade of an HSV color.

   (define (darkerHSV c)
   
   
   
   
   )
   

2. A function that generates a random RGB color.

   (define (randomRGBColor)
   
   
   
   
   )
   

3. A function that returns one color (provided as a parameter) half of the time (randomly) or a second color (provided as another parameter) the other half of the time.

   (define (pickAColor c1 c2)
   
   
   
   )
   

   So the function call (pickAColor red blue) would randomly return either red or blue.

You may use the helper functions we defined in class examples such as rand, first, etc.

Examples

• DarkerLighter
• Countdown
• SaltShaker