[Visualpython-users] More fixes

[Bruce S. <ba...@an...>]

New DLL and new VPython for Windows at 
http://cil.andrew.cmu.edu/projects/visual

Recently I discovered that large coordinates (bigger than about 1e45) were 
not handled correctly. This broke when we went from Python 1.5 to Python 
2.0 but wasn't noticed until now. (A program that worked last December 
didn't work any more.)

David Scherer suggested changing floats to doubles in some critical parts 
of Visual. David Andersen tried this and found that it indeed fixes the 
problem.

It turns out that this also fixes a seemingly unrelated problem that crept 
in with Python 2.0. The demo programs wave.py and drape.py sometimes 
flickered, putting a curve endpoint momentarily at the upper right corner 
of the window. This bug is now gone.

Our best guess, but it is only a guess at this time, is that some aspect of 
the Numeric module changed with the change to Python 2.0, in a way that 
affected Visual, which uses Numeric arrays in various ways.

Bruce Sherwood