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---
title: "Drawing Pixels in Plan9"
url: drawing-pixels-in-plan9.html
date: 2023-05-27T17:41:33+02:00
type: notes
draft: false
tags: [plan9, graphics]
---
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.
```c
#include <u.h>
#include <libc.h>
#include <draw.h>
#include <cursor.h>
void main(int argc, char *argv[])
{
ulong co;
Image *im, *bg;
co = 0xFF0000FF;
if (initdraw(nil, nil, argv0) < 0)
{
sysfatal("%s: %r", argv0);
}
im = allocimage(display, Rect(0, 0, 100, 100), RGB24, 0, DYellow);
bg = allocimage(display, Rect(0, 0, 1, 1), RGB24, 1, co);
if (im1 == nil || bg == nil)
{
sysfatal("get more memory, bub");
}
draw(screen, screen->r, bg, nil, ZP);
draw(screen, screen->r, im, nil, Pt(-40, -40));
flushimage(display, Refnone);
// Wait 10 seconds before exiting.
sleep(10000);
exits(nil);
}
```
And then compile with Makefile:
```makefile
</$objtype/mkfile
RC=/rc/bin
BIN=/$objtype/bin
MAN=/sys/man
main:
$CC $CFLAGS main.c
$LD $LDFLAGS -o main main.$O
```
*This is **very cool** indeed!*
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