Date   : Fri, 03 Feb 2006 01:28:55 +0000
From   : jgh@... (Jonathan Graham Harston)
Subject: Re: Graphics extension rom

Peter Craven <cjl_craves@...> wrote:
>   Does anybody have instructions, extra plot commands, etc. for use of
> Graphics Extension ROM? Does this ROM work on Master Computer?
 
PLOT numbers:
 
b1-b0: 00 Move
       01 Draw in current foreground colour
       10 Draw in logical inverse colour
       11 Draw in current background colour
b2:    0  Relative coordinates
       1  Absolute coordinates
 
If %00------:
b3:    0  Last point in lines plotted
       1  Last point in lines omitted
b4:    0  Draw in solid lines
       1  Draw in dotted lines
b5:    0  First point in lines plotted
       1  First point in lines omitted (GXR/Master only)
 
If <>%00---xxx:
b7-b3: 01000xxx  64+xxx Plot single point
       01001xxx  72+xxx Horizontal line fill
       01010xxx  80+xxx Plot filled triangle
       01011xxx  88+xxx Horizontal line blanking to right
 
The following are available on the B/B+/E with GXR, and built in
to Masters.
 
       01100xxx  96+xxx Plot rectangle
       01101xxx 104+xxx Horizontal line fill
       01110xxx 112+xxx Plot parallelogram
       01111xxx 120+xxx Horizontal line fill to nonbackground
       10000xxx 128+xxx Flood fill nonbackground
       10001xxx 136+xxx Flood fill foreground
       10010xxx 144+xxx Plot circle outline
       10011xxx 152+xxx Plot circle filled
       10100xxx 160+xxx Plot arc
       10101xxx 168+xxx Plot filled chord segment
       10110xxx 176+xxx Plot filled sector
       10111xyy 184+xyy Move or copy rectangle
         b1-b0: 00 Do nothing
                01 Move rectangle
                10 Copy rectangle
                11 Move and copy rectangle, ie swap rectangle
       11000xxx 192+xxx Plot ellipse outline
       11001xxx 200+xxx Plot ellipse filled
 
-- 
J.G.Harston - jgh@...                - mdfs.net/User/JGH
Our chief weapons are 'who', 'ps -aux', 'kill -9', and a fanatical devotion
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