Download Tagger.py from the class web page:
It contains code very similar to Wanderer.py from Homework 2.
You might find that it makes more sense now :)
The object of this homework is to make the turtles play tag.
When the program starts, it will choose one of the turtles to
be `it'. This turtle will chase the others, and when it catches
one, it tags the other turtle. The other turtle becomes `it,'
and the game proceeds.
Some additional rules are:
- Turtles have to stay in bounds. You can use an algorithm
like what you used on Homework 2.
- After a turtle is tagged, it has to sulk for a while before
it can start chasing the other turtles.
- It should be possible, eventually, for the slow turtle to
tag the faster turtles.
When you run Tagger.py you will see that there are buttons
in the control panel labelled
Run, Stop, Step and Clear. Press Run to start the game and Stop
to call a time-out. When you press Step, the World object invokes
the run method once on each turtle. This feature might
be helpful for debugging.
Here are some suggestions for methods you might want to have in
the Tagger class:
- Compute the distance to another turtle.
- Turn toward another turtle. HINT: see the documentation
- Find the closest other turtle. Note: the world object
has an attribute named animals that is a list of all the
Turtles currently in the world.
- Tag another turtle.
- Change color (maybe the turtle who is `it' should be red and
a sulking turtle should be blue).
WARNING: Turtles already have an attribute named tag, so
you should not create a method named tag.