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pygame.Rect question

Peter Pearson ppearson at nowhere.invalid
Mon Apr 9 11:41:17 EDT 2012 
On Sun, 8 Apr 2012 16:58:01 -0700 (PDT), Scott Siegler wrote:
[snip]
> I set rect.left to 30, rect.top to 30 and rect.width = 20
>
> This works fine.  However, when looking at rect.right() it
> shows that it is equal to 50. I suppose this is equal to
> 30+20.  However, since the first pixel is on location 30,
> wouldn't the 20th pixel be on 49 (not 50)?
>
> Am I missing something here?  It is really confusing me
> when I am doing some collision algorithms.

I'm not a pygame expert, but . . . it would be consistent
with Python's conventions for ranges of indices if
rect.right() were the first pixel *outside* the rectangle.
Of course, one would expect rect.bottom() to work similarly.

If this is the right explanation, it will be useful to
picture indices pointing between pixels, rather than at
pixels.

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