some turtle questions

[Brian Blais]

Hello,

I am trying to think of things to do with the turtle module with my  
students, and I have some ideas where I am not sure whether the  
turtle module can do it.

1) is there a way to determine the current screen pixel color?  I am  
thinking about having the turtle go forward until it reaches an  
object, say a red circle.  I can probably do this by making circle  
objects (drawn with turtles themselves) which know their own  
position, and check against this info.  But I thought it might be  
useful also for the turtle to know.

2) is there a way to put a limit on the extent the turtle can  
travel?  it seems I can keep moving off of the screen.  Is there a  
way to make it so that a forward(50) command, at the edge, either  
raises an exception (at the wall) or simply doesn't move the turtle  
because of the limit?


thanks!


		bb

-- 
Brian Blais
bblais at bryant.edu
http://web.bryant.edu/~bblais
http://bblais.blogspot.com/



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