[A83] Re: Tilemap

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[A83] Re: Tilemap


Okay, sligh mistake from my part, try this:
 
> left:
> ;all the shift routines use the same style, so it's only commented once:
> ;since we have a 13x9 tilemap, we can only shift right,left,up,down once,
> ;so check if we aren't already. If we are already u,l,d,r, return to the 
> loop..
>   ld a,(x_origin)
   cp 0
   jr z,wait
> 
> ;else, decrement the x origin for left, increment it for right..
> ;decrement the y origin for up, increment it for down...
> ;origin is already in a since we needed to check it...
>   dec a
>   ld (x_origin),a
> ;call the tilemap routine...
>   call writemap
> ;and write the buffer to the screen:
>   bcall(_grbufcpy)
>   jr wait
> 
> right:
>   ld a,(x_origin)
   cp 2
   jr z,wait
>   inc a
>   ld (x_origin),a
>   call writemap
>   bcall(_grbufcpy)
>   jp wait
> 
> up:
>   ld a,(y_origin)
   cp 0
   jr z,wait
>   dec a
>   ld (y_origin),a
>   call writemap
>   bcall(_grbufcpy)
>   jp wait
> 
> down:
>   ld a,(y_origin)
   cp 2
   jr z,wait
>   inc a
>   ld (y_origin),a
>   call writemap
>   bcall(_grbufcpy)
>   jp wait
> 
> ; then there was the
> map_width:
>   .dw 14 ; width of map as a word!

--Peter-Martijn


> I suppose you're modifying my example program,
> > then I suppose too that you're forgetting to modify the left/right/up/down 
> > routines...
> > the Down and right routines compare to 13 (original width) - 12 (=1)
> > and 9 (original height) - 8 (=1)
> > 
> > you need to change the value in the down routine to [your height] - 8
> > and in the right routine to [your width] - 12
> > 
> > hope this helps...
> > --Peter-Martijn
> > 
> 
> 
> 
> 
>
References: