On Thu, 01 Mar 2007 15:48:29 +1300 Greg Ewing <[EMAIL PROTECTED]> wrote:
> No, "pixel perfect" usually means taking the actual shape > of the object into account, i.e. comparing their bitmaps. > This is obviously a lot more expensive than just comparing > the bounding rects. > > Rest assured that Python has no trouble doing integer > arithmetic accurately, and will tell you for certain > whether the bounding rects intersect or not. :-) > > (If you were using floats for your rect coordinates, > you might have some accuracy limitations, but that's > a general feature of float arithmetic, and nothing to > do with Python.) > On Wed, 28 Feb 2007 18:27:42 -0800 "Bob Ippolito" <[EMAIL PROTECTED]> wrote: > Pixel perfect detection typically means that you're actually comparing > a bitmap mask of two sprites, to see if the actual pixels overlap. > > Comparing rectangles or circles is a lot cheaper than individual > pixels. You can check the pixels *after* you've found a collision in > the rectangles (which means they're at least very close to touching > visually), but usually you don't have to bother. > > -bob Thanks for clearing that up guys. I'll remember that.
