[Visualpython-users] three projectiles

[Lenore H. <lh...@si...>]

Thanks for everyone's patience.  My goal program for tomorrow  
afternoon's lecture works.

I was evil and modified the controls.py file rather than rewriting the  
slider class in my own file.  The rewrite lets the sliders be labeled  
with the current value of the slider (using the code in  
colorsliders.py).  (I didn't try to fix the setting value thing or  
experiment any more with modifying the buttons.)

The program itself launches three balls: no air resistance, air  
resistance proportional to v, air resistance proportional to v^2.   
Three sliders control launch angle, launch speed, and a constant of  
proportionality for the two experiencing air resistance.  Hitting go a  
second time will overlay a new set of traces on the previous set.   
Hitting reset and then go gives a clean screen but does not change  
slider values.

Many thanks to Bruce Sherwood for his help with the behavior of  
sliders and buttons.

Tested on G4 OS X 10.5.8, VPython 5.12 (MacPython 2.6).