[pygame] drawing issues

[Pete Shinners <shredwheat@mediaone.net>]

well, this week arturo slugged in with a few problems with the 
pygame.draw module. problems from crashes to minor uglies.

the first problem was biggest. drawing filled polygons with points 
outside the surface area was causing problems. i found some (now) 
obvious cases where the clipping was failing, and thus stuff was drawing 
offscreen. this was definitely cause for a crash, and has been all 
cleaned up.

the second problem involves drawing very wide lines. i have to admit 
that the wide line drawing implemented in pygame.draw is a bit hackish. 
there is a problem drawing wide lines that get clipped. once an end of 
the line is clipped, visible gaps appear in the wide line. the wide line 
drawer works ok for line widths around 5 or so. but  bigger than that 
and things get ugly.

i suppose the best solution for wide lines would be to use the polygon 
drawer. for now if you really need wide lines, you can do that. hmm, 
perhaps i should do that internally. just turn a wide line into a 4 
point polygon and fill it?

well, what is the demand out there for wide line drawing? if someone 
really needs it i can definitely bump it up on my priority list. 
elsewise it goes to the back burner :]

the good news is the problems (and potential crashing) with polygon 
drawing is cleaned up. this is all checked into cvs now (along with 
fixed Rect comparisons and a smarter config_unix script)

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