[A83] Re: Tilemap Routine
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[A83] Re: Tilemap Routine
I don't think anyone is going to comment all that for you. Tilemap routines
have been explained _many_ times in the past. Search the archives, and you
should find a general explanation of what a tilemap routine actually does.
> A couple months ago I was give a nice little 8*8 tilemap routine. And since
> I can't figure out how it works I was wondering if someone could explain to
>
> me by explaining the lines of source code. I want to know how it draws the
> tiles to the screen and how each line of code is contributing to drawing
> the
> map. I know that's alot to ask but it would be very helpful. Heres the
> routine:
> hl->tilemap
> de->tiles
> keypress is put in a
> drawTileMap:
> ld b,0
> ld c,a
> add hl,bc
> push hl
> pop ix
> ld hl,8E29h
> ld bc,8*256+12
> drawTileMapLoop:
> push bc
> ld b,c
> drawLineLoop:
> push bc
> push hl
> ld h,0
> ld l,(ix)
> inc ix
> add hl,hl
> add hl,hl
> add hl,hl
> add hl,de
> ex de,hl
> ex (sp),hl
> ld b,8
> drawTileLoop:
> ld a,(de)
> ld (hl),a
> inc de
> ld a,b
> ld b,0
> add hl,bc
> ld b,a
> djnz drawTileLoop
> ld de,-(8*12)+1
> add hl,de
> pop de
> pop bc
> djnz drawLineLoop
> ld c,7*12
> add hl,bc
> ld c,12-12
> add ix,bc
> pop bc
> djnz drawTileMapLoop
> ret
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