Re: A86: Erasing Old Sprites

To: <assembly-86@lists.ticalc.org>
Subject: Re: A86: Erasing Old Sprites
From: "Super Llama" <diddy@apci.net>
Date: Mon, 31 Aug 1998 19:11:11 -0500
Delivered-To: assembly-86-outgoing@towerguard.unix.edu.sollentuna.se
Reply-To: assembly-86@lists.ticalc.org

He is the code.

Thanks

>
>If you change PutSprite so that it xor's the sprite to the screen, then
when
>you Putsprite once it will put the sprite down, and a second time will
erase
>it.  If you put the putsprite routine into an e-mail, either I or someone
else
>can change it so it xor's to the screen.  This is probably the easiest way,
>and you don't need to have the "Clear" sprite.
>
>
>In a message dated 8/31/98 6:44:37 PM Central Daylight Time, diddy@apci.net
>writes:
>
><< I am trying to learn asm, and I am working on a sprite demo.  This code
> should draw a sprite and then when I press a directional key it should
> delete the old sprite position and then draw it in the new sprite position
> (deleting the old one).  I did not include the PutSprite routine because I
> think everyone that could answer this question knows what the answer is.
> The problem is it does not do this (what I explained above) so I was
> wondering if anyone could help.
>
> Anyway in case you dont know the variables:
>
> cd = x,y coordinates
> ix = the sprite to display
>
> Also this is and 8x8 sprite rotuine that i got off of ticalc.org.
>
> If anyone could help me I would be greaty appreciated.  Oh yeah and I
> removed the comments for space concerns
>
> #include "asm86.h"
> #include "ti86asm.inc"
>
> .org _asm_exec_ram
>
>     call _clrLCD
>     call BUSY_OFF
>     jr Setup
>
> Setup:
>     ld b,0
>     ld c,0
>     ld ix,0
>     ld ix,Dude
>     call PutSprite
>     jr Test
>
> Test:
>     jp ClearOld
>
> Move:
>     call GET_KEY
>     cp K_EXIT
>     jr z,Exit
>     cp K_UP
>     jr z,Up
>     cp K_DOWN
>     jr z,Down
>     cp K_LEFT
>     jr z,Left
>     cp K_RIGHT
>     jr z,Right
>     jr Move
>
> Up:
>     ld a,c
>     sub 8
>     ld c,a
>     jp DrawNew
>
> Down:
>     ld a,c
>     add a,8
>     ld c,a
>     jp DrawNew
>
> Left:
>     ld a,b
>     sub 8
>     ld b,a
>     jp DrawNew
>
> Right:
>     ld a,b
>     add a,8
>     ld b,a
>     jp DrawNew
>
> Exit:
>     call _clrLCD
>     ret
>
> ClearOld:
>     ld b,b
>     ld c,c
>     ld ix,0
>     ld ix,Clear
>     call PutSprite
>     jp Move
>
> DrawNew:
>     ld ix,0
>     ld ix,Dude
>     call PutSprite
>     jp Move
>
> Dude:
> .db %01110000
> .db %01110000
> .db %00100000
> .db %00100100
> .db %01111110
> .db %00110100
> .db %00111000
> .db %01101100
>
> Clear:
> .db %00000000
> .db %00000000
> .db %00000000
> .db %00000000
> .db %00000000
> .db %00000000
> .db %00000000
> .db %00000000
> .db %00000000
>  >>
>
>

movedude.asm