Re: A83: tracking and moving many objects
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Re: A83: tracking and moving many objects
i wrote a really good one for zelda, but i lost the source when i
reformatted. I'm sure that Sam Heald has it, but i'll go ahead and
explain it since the algorithm is simple.
the best method is using a queue, where we have a static size of each item
in the queue, but a variable size. Here is some code to explain:
projectileQueue = savesscreen
; entry format
; .db <projectile ID>,<xpos>,<ypos>
...
addEntryToQueue:
ld hl,projectileQueue
findEmptyQueueItem:
ld a,(hl)
or a
jr z,emptyItemFound ; we are 3 bytes past the last item
; or at the first
inc hl
inc hl
inc hl
jr findEmptyQueueItem
emptyItemFound:
ld (hl),b ; projectile ID
inc hl
ld (hl),c ; xpos
inc hl
ld (hl),d ; ypos
ret
hope that helps.
-harper
On Fri, 30 Jun 2000, Man on the Moon wrote:
>
> What is a good method or algorithm to keep track of many objects, such as
> the coordinates of bullets in a game, and move these objects as well? I did
> come up with a method of storing each in a user defined varible but that was
> a pain in the neck, or code.
>
> From: Chris (Man on the Moon)
> e-mail: apparatus@mediaone.net
>
>
>
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