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----
-title: "Drawing Pixels in Plan9"
-url: drawing-pixels-in-plan9.html
-date: 2023-05-27T17:41:33+02:00
-type: note
-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.
-
-More information:
-
-- [draw.h header file](https://github.com/0intro/plan9/blob/main/sys/include/draw.h)
-  contains all the drawing functions
-- [draw man page](https://9fans.github.io/plan9port/man/man3/draw.html)
-  has a bit more digestable descriptions of the draw functions
-- [graphics man page](https://9fans.github.io/plan9port/man/man3/graphics.html)
-  has a bit more digestable descriptions of the graphics functions
-- [all man pages](https://9fans.github.io/plan9port/man/man3/)
-  can be a valuable resource for learning about the system
-
-![Plan9 Howdy World!](/notes/plan9-pixels.png)
-
-```c
-// main.c
-#include <u.h>
-#include <libc.h>
-#include <draw.h>
-#include <cursor.h>
-
-void
-main()
-{
-  ulong co;
-  Image *im, *bg;
-  co = 0x0000FFFF;
-
-  if (initdraw(nil, nil, argv0) < 0)
-  {
-    sysfatal("%s: %r", argv0);
-  }
-
-  im = allocimage(display, Rect(0, 0, 300, 300), RGB24, 0, DYellow);
-  bg = allocimage(display, Rect(0, 0, 1, 1), RGB24, 1, co);
-
-  if (im == nil || bg == nil)
-  {
-    sysfatal("not enough memory");
-  }
-
-  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 `mk` (mkfile below):
-
-```makefile
-# mkfile
-</$objtype/mkfile
-
-RC=/rc/bin
-BIN=/$objtype/bin
-MAN=/sys/man
-
-main:
-        $CC $CFLAGS main.c
-        $LD $LDFLAGS -o main main.$O
-```
-
-And run with `./main`. To exit the program, press `Delete key` (strange but this
-is the alternative for Ctrl+C).
-
-*This is **very cool** indeed!*