• To repeat a line in WeScheme: ctrl P
  
• To repeat a line in DrRacket: ctrl uparrow
  
• For the graphics programs in DrRacket:

  #lang racket
  (require 2htdp/image)
  

  and then "run"

Colors available in WeScheme - no spaces, and capital letters are optional

1. Circle

   The "contract" for Circle is: circle: Number String String -> image

   (circle 100 "solid" "red")

   

   (circle 50 "solid" "crimson")

   

   (circle 75 "outline" "orange")

   

2. More contracts and images to try:
   • ; rectangle: Number Number String String -> Image
   • ; ellipse: Number Number String String -> Image
   • ; triangle: Number String String -> Image
   • ; star: Number String String -> Image
   • ; radial-star: Number Number Number String String -> Image
   • ; text: String Number String -> Image
   • ; regular-polygon: Number Number String String -> Image

   (rectangle 500 250 "solid" "chocolate")

   

   (text "Hello World" 100 "orchid")

   

   (star 100 "solid" "olive")

   

   (radial-star 8 8 64 "solid" "lime")

   (radial-star 8 40 64 "solid" "ForestGreen")

   

3. Try your own shapes and colors

4. Try this program. Type this into the top part of the screen "Definitions". The press the "Run" button.

   This will put two shapes next to each other on the same line: overlay/xy

   (overlay/xy
      (radial-star 8 8 64 "solid" "lime")
      100 0
      (radial-star 8 40 64 "solid" "ForestGreen")
   )
   
   (overlay/xy
      (regular-polygon 50 8 "solid" "plum")
      200 0
      (radial-star 8 40 64 "solid" "aqua")
   )
   

   

5. Now make up your own picture