Turtle Graphics
What is it?
There is a long tradition of using the Logo turtle to create "turtle graphics" drawings. By enabling multiple turtles to move (and draw) in parallel, StarLogo greatly expands the possibilities for turtle graphics. This project presents a collection of StarLogo turtle-graphics programs.
How to Use It
For each program, first click the `setup` button, then click the corresponding `go` button. |
Things to Notice
In the first two programs, the turtles draw patterns with their pens (in classic Logo style). In the other programs, the turtles themselves form the patterns. In all of these programs, the turtles simply draw circles. Nothing more. Interesting patterns are created by starting the turtles with interesting initial conditions and by having some turtles "hatch" other turtles. But when the turtles move, they simply draw circles, nothing more.
Explorations
Modify the underlying programs. Observe how small changes in the programs can lead to major changes in the resulting patterns.
StarLogo Features
Several of the turtle-graphics programs use the following trick: make several turtles rotate in place (in the middle of the screen) and "hatch" a stream of new turtles as they rotate. The newly hatched turtles typically draw a circle and then die. This simple technique creates some spectacular effects.
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