Re: A83: Background routine...
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Re: A83: Background routine...
I have to say I hate people like that, but how is this gonna help much
if you are making a game? By doing this you have to have a full fledge
picture for each piece of screen. That's way too big to use for a
side/vertical scroller. I have one that uses sprites for a side scroller
and would do the same thing for a game. Except it keeps crashing. If you
want to debug it and use it then cool.
James Matthews wrote:
>
> I know my tutorials are slow coming out, but senior year + college
> apps + ThinkQuest + Monopoly (programming) + chicks...um, tutorials
> are waaaay down there :)...anyway, here is my Background tutorial.
> Thanks to Movax (ey?)....
>
> Tutorial 39: Scrolling Background.
> More Game Techniques.
> Introduction.
> Well, after attempt after attempt at finding or writing a decent
> scrolling routine. I'm talking to Movax, and he's like "Hold on", 5
> minutes later I'm running a perfect scrolling routine he'd just
> written (don't you hate people like that! =Ž). Thanks a lot to Hannes
> "Movax" Edfeldt.
>
> New Commands.
>
> _getk - I've covered this briefly before. Here's the formal
> cover…like BASIC getkey. Returns value of the key to OP1. Values are
> shown the Ti-manual.
>
> The Code.
>
> ld hl,picture ;Load your pic.
> ld de,PLOTSSCREEN
> ld bc,768
> ldir
> call _grbufcpy_v
>
> loop:
> call _scrollright
> call _grbufcpy_v
>
> call _getk ; Key to OP2.
> call _op2toop1
> call _convop1
> cp 45 ; If clear…
> jp nz,loop ;
> ret
>
> _ScrollRight:
> ld de,12
> ld hl,8e29h-1
> ld b,64 ; 64*12=768 bytes to rotate
> _loop1:
> push hl ; Test if there's a bit to wrap around
> add hl,de
> ld a,(hl)
> and 00000001b
> sub 00000001b
> ccf
> pop hl
>
> inc hl ; We'll waste space here to gain some speed
> rr (hl)
> inc hl
> rr (hl)
> inc hl
> rr (hl)
> inc hl
> rr (hl)
> inc hl
> rr (hl)
> inc hl
> rr (hl)
> inc hl ; We'll waste space here to gain some speed
> rr (hl)
> inc hl
> rr (hl)
> inc hl
> rr (hl)
> inc hl
> rr (hl)
> inc hl
> rr (hl)
> inc hl
> rr (hl)
>
> djnz _loop1
>
> ret
>
> picture:
> ;Put your picture here.
>
> .end
> END
>
> Conclusion.
> Thanks again to Movax for this routine! This should help all of you
> game freaks out there! If you come up with a better routine that
> scrolls left/right, up/down, or all directions, please contact me!
> Thanks.
>
> {button , Klink(Scrolling;Movax;Graphics)} Related Topics.
>
> Addition: if you come up w/a routine that is *well documented*
> contact me :)...
>
> Later,
>
> James Matthews (matthews@tkb.att.ne.jp)
>
> ICQ: 7413754
> http://home.att.ne.jp/gold/tomcat21/index.html
> http://library.advanced.org/18242/
--
Scott Dial
revenant_1@hotmail.com
ICQ#3608935
References: