A83: Re: Hit Detection


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A83: Re: Hit Detection




These assume your sprites are 8x8.  They could probably be better optimized.
However they do work perfectly:

; bc = (x1,y1), de = (x2,y2)
; returns: no carry = collision
CheckCollision:
 ld a,d
 add a,7
 cp b
 ret c
 ld a,b
 add a,7
 cp d
 ret c
 ld a,e
 add a,7
 cp c
 ret c
 ld a,c
 add a,7
 cp e
 ret

; in: bc = point, de = coords
; returns: no carry = collision
CheckPoint:
 ld a,d
 add a,7
 cp b
 ret c
 ld a,e
 add a,7
 cp c
 ret c
 ld a,b
 cp d
 ret c
 ld a,c
 cp e
 ret

>
> Does anybody have a good routine for hit detection?  If not maybe a
tutorial that i could read.  Thanks that would be great.
>


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