A86: Re: detecting hits
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A86: Re: detecting hits
Hrmm, maybe I should release all the non-specific source code from my last
game...
These routines might come in handy when doing sprite or tilemap stuff:
; 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
> here is my routine to check if 2 8x8 sprites are
> hitting
> ...
> but it does not work all the time!!!
> any ideas why? i will try debugging it later but want
> to make sure the logic is right
References: