Re: A83: Background routine...

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Re: A83: Background routine...


OHHH... k

what have you done using scrolling backgrounds?

Im saying its only logical to use it in a fighting game where the background
would take up 2 screens at the most (im contemplating this for Punchout 83s
background)

if you are using it for a different type of game, say RPG.. then you would
run out of memory with roughly 5x5 screens of information.

-Harper Maddox

jerky@ebicom.net
IRC nick: Geori
ICQ: 1214597

-----Original Message-----
From: Linus Akesson <lairfight@softhome.net>
To: Harper Maddox <assembly-83@lists.ticalc.org>
Date: Monday, September 07, 1998 11:45 AM
Subject: Re: A83: Background routine...


>
>wrong.
>
>Linus
>
>On 07-Sep-98, Harper Maddox wrote:
>
>>the only practical application of a scrolling background is for a fighting
>>game
>
>>-Harper Maddox
>
>>jerky@ebicom.net
>>IRC nick: Geori
>>ICQ: 1214597
>
>>-----Original Message-----
>>From: Scott Dial (Revenant) <homosapian@geocities.com>
>>To: assembly-83@lists.ticalc.org <assembly-83@lists.ticalc.org>
>>Date: Monday, September 07, 1998 10:51 AM
>>Subject: 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! =Þ).  Thanks a lot to Hannes
>>>> "Movax" Edfeldt.
>>>>
>>>> New Commands.
>>>>
>>>> _getk - I've covered this briefly before.  Here's the formal
>>>> coverlike 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
>>>
>
>
>
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