Robert A. Colbert wrote:
>well, over my lunch I added collision detection using PCAE, it works >great with one limitation: I did not add detection for clone objects >on items that have multiple copies. Not because it doesn't seem >possible, I just ran out of time. Anyway, the collision detection >checks to see if the shot enters the rectangular area occupied by a
>sprite. It compensates for double and quadruple width sprites, as well >as any height sprite. The detection is not as robust as that built >into the 2600's hardware, because it does not check to see if a >particular pixel in the rectangular area is "on". I have played with >it a bit on the emulator and it exceeded my expectations. I haven't >tried it on a real 2600, so it may jump all over the place if my timing >isn't right, so you'll have to wait until monday to see it (I'll work >on it a bit more this weekend).
Rescue does both collision tests. If the 2600 doesn't report the type
of collision I'm testing, it just skips along, but if it does, then I
bounds test to isolate which sprites/platforms are involved. I think
you can do it something like that without too much extra work to get the
full pixel-level collision checking you need. The multiplexing is the
problem, but maybe not too big a problem if you stick with the tiny
bullets and move them one pixel at a time, they will have a great chance
of colliding during an ON phase, while passing over/through a good sized
target...
--
mor@xxxxxxx
http://www.crl.com/~mor/
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