Turtle Graphics - JavaScript/VRML

Activities

• Draw a square by applying forward 100 and left 90 repeatedly.
• Put the pen up, move forward then put the pen down and complete a second square.
• The picture can be cleared by reload. Try the "squares" button. Guess what commands are executed before inspecting the source of turtle.htm to find out.
• Take copies of the files turtle.htm and turtle.wrl. Adapt the function(s) to achieve the following:
  • Pack in ten squares - rotate only 36 degrees between squares.
  • Pack in x squares, where x is specified by the user. Rotate an appropriate amount between each square.
  • Create a new button which activates a new function SawTooth. The effect should be to draw a "saw tooth wave" with specified amplitude and wavelength. (Students who have forgotten their trig. may implement square waves).
  • Create a new button to draw a wire frame cube.

Technical notes.