Re: A83: Partial screen draws

To: assembly-83@lists.ticalc.org
Subject: Re: A83: Partial screen draws
From: GeradS711 <GeradS711@aol.com>
Date: Tue, 13 Jan 1998 22:20:19 EST
Organization: AOL (http://www.aol.com)
Reply-To: assembly-83@lists.ticalc.org


Yes

> Okay, I know that I can draw a picture to the screen by doing:
>  
>   ld hl,repback
>   ld de,plotsscreen
>   ld bc,768
>   ldir
>   call _grbufcpy_v
>  
>  where repback is the name of an asm picture converted by pic83.  My 
>  question is, what does each line do?
>  
>  Also, can I just draw part of the screen.  For example, say I have a 
>  screen like this:
>  
>  |------------------------------------------------------|
>  |             |                                        |
>  |             |                                        |
>  |             |                                        |
>  |             |                                        |
>  ....
>  
>  and the left side is a toolbar, and the right side is the main 
>  screen.  Can I just draw parts of the screen so that the toolbar 
>  stays the same, while the main screen is updated?  It is kind of 
>  wasteful to redraw the entire screen when I only need to update small 
>  portions.
>  
>  
>  
>  Jonathan Wang
>  jwang@isb.bj.edu.cn
>  jonathan_wang@hotmail.com
>  
>  Come visit my home page:
>  http://www.htmlinfo.home.ml.org/
>  
>  Quote of the day:
>  
>       Virtue has never been as respectable as money.
>                                  - Mark Twain

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