That's a good list.
> Don't put a computed expression in a the head statement of a
> for-next loop.
This reminds me of a somewhat more general piece of advice: don't do
anything inside the loop that you could instead do once before the
loop. A common newbie mistake in using RGBSurfaces is to write
something like:
for y = 0 to ymax
for x = 0 to xmax
DoSomethingWith pic.RGBSurface.Pixel(x,y)
next
next
which is horribly, horribly slow, since the pic.RGBSurface call is
(usually) very expensive. Instead, do:
Dim surf as RGBSurface = pic.RGBSurface
for y = 0 to ymax
for x = 0 to xmax
DoSomethingWith surf.Pixel(x,y)
next
next
This is dramatically faster. But it doesn't apply only to RGBSurfaces;
in general, anything you can do outside the loop, do outside the loop
(when speed counts).
HTH,
- Joe
--
Joe Strout -- [EMAIL PROTECTED]
Verified Express, LLC "Making the Internet a Better Place"
http://www.verex.com/
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