Re: A83: Re: Many Pixels... Routine? =P

To: assembly-83@lists.ticalc.org
Subject: Re: A83: Re: Many Pixels... Routine? =P
From: benjamin99@juno.com (Master M)
Date: Tue, 3 Nov 1998 19:19:57 -0600
Delivered-To: assembly-83-outgoing@towerguard.unix.edu.sollentuna.se
Reply-To: assembly-83@lists.ticalc.org


I highly suggest that you get familiar witth bit masks

On Mon, 2 Nov 1998 22:18:13 EST Jkhum98@aol.com writes:
>
>In a message dated 11/02/98 9:57:27 PM, electrum@tfs.net writes:
>
>>What exactly are you trying to do?
>
>I want to be able to list the coordinates somewhere in the program 
>like so...
>
>X_Data:	.db 14, 28, 29, 32, 96, 4, 35, etc.  
>Y_Data:	.db 63, 25, 78, 79, 22, 12, 61, etc.  (Just examples)
>
>...and then load the labels into registers to point to that data, then 
>specify
>how many pixels for it to plot... 'ld b, 7' since there's seven values 
>in that
>example. 
>
>These are all various points that I know I want to plot throughout the 
>screen,
>and have no order to use a large sprite routine for, so I want to be 
>able to
>just let it plot anything I list. Since it will be Many pixels, it 
>should
>write them to the Graph Buffer, and then I can copy the buffer to the
>display...
>
>>You can use or write your own FindPixel function, which is a
>>function that you pass the X,Y coords (usually in BC or DE) that
>>returns the address in the video buffer of the pixel and the
>
>>bitmask of the pixel in A.  It would look like this:
>
>
>
>>ld bc,(19<<8)+37    ; draw pixel at (19, 37)
>
>>call FindPixel
>
>>or (hl)             ; set the pixel in the video buffer
>
>>ld (hl),a           ; and save it, because "or (hl)" saves it in A
>
>Ok, I'm not quite familiar with all that yet, like using bitmasks and 
>such, so
>it would be very helpful if I could have a routine that carries out 
>this
>function, and I can learn off of that... I see your example will write 
>this
>individual point, but I need a routine that will go down this array 
>of
>coordinate data, looking up each point, then incrementing to the next 
>location
>of data in the series of '.db's...
>																--Jason 
>K.
>

<<<<<<<<<<<<<<<<<<<<<<<<<+>>>>>>>>>>>>>>>>>>>>>>>>>
       See ya,
       Mastermind

       http://www.bigfoot.com/~mastermind5

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