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<!doctype html><html lang=en-us><meta charset=utf-8><meta name=viewport content="width=device-width,initial-scale=1"><link href="data:image/x-icon;base64,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" rel=icon type=image/x-icon><title>Drawing Pixels in Plan9</title><meta name=description content="I have started exploring Plan9&#39;s graphics capabilities."><link rel=alternate type=application/rss+xml title="Mitja Felicijan's posts" href=https://mitjafelicijan.com/index.xml><link rel=alternate type=application/rss+xml title="Mitja Felicijan's notes" href=https://mitjafelicijan.com/notes.xml><style>body{padding:1rem;max-width:760px;background:#fff;font-family:times new roman,Times,serif;line-height:1.35rem}hr{margin-block-start:1.5rem}h1,h2,h3{line-height:initial}footer{margin-block-start:3rem}table{max-width:100%;border-collapse:separate;border-spacing:2px;border:1px solid #000;border-left:1px solid #999;border-top:1px solid #999}blockquote{font-style:italic}table thead{background:#eee}td,th{border:1px solid #000;padding:4px;border-right:1px solid #999;border-bottom:1px solid #999;text-align:left}pre{text-wrap:nowrap;overflow-x:auto;margin-block-start:1.5rem;margin-block-end:1.5rem;padding:.5rem 0;border-top:1px solid #000;border-bottom:1px solid #000}pre code{line-height:1.3em}pre,code,pre *,code *{font-family:monospace;font-size:initial!important}img,video,audio{max-width:100%}header{display:flex;flex-direction:row;gap:3rem}nav{display:flex;gap:.75rem}.pstatus-orange{background:gold}.pstatus-green{background:#9acd32}.pstatus-red{background:#cd5c5c}@media only screen and (max-width:600px){header{flex-direction:column;gap:1rem}a{word-wrap:break-word}}</style><header><nav class=main><a href=/>Home</a>
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<a href=/index.xml target=_blank>RSS</a></nav></header><main><div><h1>Drawing Pixels in Plan9</h1><p>May 27, 2023<div><p>I have started exploring Plan9's graphics capabilities. This is a hello world
alternative for drawing that draws a yellow square on a blue background.<p>More information:<ul><li><a href=https://github.com/0intro/plan9/blob/main/sys/include/draw.h>draw.h header file</a>
contains all the drawing functions<li><a href=https://9fans.github.io/plan9port/man/man3/draw.html>draw man page</a>
has a bit more digestable descriptions of the draw functions<li><a href=https://9fans.github.io/plan9port/man/man3/graphics.html>graphics man page</a>
has a bit more digestable descriptions of the graphics functions<li><a href=https://9fans.github.io/plan9port/man/man3/>all man pages</a>
can be a valuable resource for learning about the system</ul><p><img src=/notes/plan9-pixels.png alt="Plan9 Howdy World!"><pre tabindex=0 style=background-color:#fff><code><span style=display:flex><span><span style=color:green>// main.c
</span></span></span><span style=display:flex><span><span style=color:green></span><span style=color:#00f>#include</span> <span style=color:#00f><u.h></span><span style=color:#00f>
</span></span></span><span style=display:flex><span><span style=color:#00f>#include</span> <span style=color:#00f><libc.h></span><span style=color:#00f>
</span></span></span><span style=display:flex><span><span style=color:#00f>#include</span> <span style=color:#00f><draw.h></span><span style=color:#00f>
</span></span></span><span style=display:flex><span><span style=color:#00f>#include</span> <span style=color:#00f><cursor.h></span><span style=color:#00f>
</span></span></span><span style=display:flex><span><span style=color:#00f></span>
</span></span><span style=display:flex><span><span style=color:#2b91af>void</span>
</span></span><span style=display:flex><span>main()
</span></span><span style=display:flex><span>{
</span></span><span style=display:flex><span> ulong co;
</span></span><span style=display:flex><span> Image *im, *bg;
</span></span><span style=display:flex><span> co = 0x0000FFFF;
</span></span><span style=display:flex><span>
</span></span><span style=display:flex><span> <span style=color:#00f>if</span> (initdraw(nil, nil, argv0) < 0)
</span></span><span style=display:flex><span> {
</span></span><span style=display:flex><span> sysfatal(<span style=color:#a31515>"%s: %r"</span>, argv0);
</span></span><span style=display:flex><span> }
</span></span><span style=display:flex><span>
</span></span><span style=display:flex><span> im = allocimage(display, Rect(0, 0, 300, 300), RGB24, 0, DYellow);
</span></span><span style=display:flex><span> bg = allocimage(display, Rect(0, 0, 1, 1), RGB24, 1, co);
</span></span><span style=display:flex><span>
</span></span><span style=display:flex><span> <span style=color:#00f>if</span> (im == nil || bg == nil)
</span></span><span style=display:flex><span> {
</span></span><span style=display:flex><span> sysfatal(<span style=color:#a31515>"not enough memory"</span>);
</span></span><span style=display:flex><span> }
</span></span><span style=display:flex><span>
</span></span><span style=display:flex><span> draw(screen, screen->r, bg, nil, ZP);
</span></span><span style=display:flex><span> draw(screen, screen->r, im, nil, Pt(-40, -40));
</span></span><span style=display:flex><span>
</span></span><span style=display:flex><span> flushimage(display, Refnone);
</span></span><span style=display:flex><span>
</span></span><span style=display:flex><span> <span style=color:green>// Wait 10 seconds before exiting.
</span></span></span><span style=display:flex><span><span style=color:green></span> sleep(10000);
</span></span><span style=display:flex><span>
</span></span><span style=display:flex><span> exits(nil);
</span></span><span style=display:flex><span>}
</span></span></code></pre><p>And then compile with <code>mk</code> (mkfile below):<pre tabindex=0 style=background-color:#fff><code><span style=display:flex><span><span style=color:green># mkfile
</span></span></span><span style=display:flex><span><span style=color:green></span><span></$objtype/mkfile</span>
</span></span><span style=display:flex><span>
</span></span><span style=display:flex><span>RC=/rc/bin
</span></span><span style=display:flex><span>BIN=/$objtype/bin
</span></span><span style=display:flex><span>MAN=/sys/man
</span></span><span style=display:flex><span>
</span></span><span style=display:flex><span>main:
</span></span><span style=display:flex><span> $CC $CFLAGS main.c
</span></span><span style=display:flex><span> $LD $LDFLAGS -o main main.$O
</span></span></code></pre><p>And run with <code>./main</code>. To exit the program, press <code>Delete key</code> (strange but this
is the alternative for Ctrl+C).<p><em>This is <strong>very cool</strong> indeed!</em></div></div></main><footer><hr><div><h3>Want to comment or have something to add?</h3>You can write me an email at
<a href=mailto:m@mitjafelicijan.com>m@mitjafelicijan.com</a> or catch up
with me
<a href=https://telegram.me/mitjafelicijan target=_blank>on Telegram</a>.</div><hr><p>This website does not track you. Content is made available under
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