1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
|
(* File: cairo.ml
Originally part of library ocaml-cairo by Christophe Troestler
Ported to lablgtk3 by Claudio Sacerdoti Coen
Copyright (C) 2009
Christophe Troestler <Christophe.Troestler@umons.ac.be>
WWW: http://math.umh.ac.be/an/software/
This library is free software; you can redistribute it and/or modify
it under the terms of the GNU Lesser General Public License version 3 or
later as published by the Free Software Foundation, with the special
exception on linking described in the file LICENSE.
This library is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the file
LICENSE for more details. *)
open Cairo
let pi2 = 8. *. atan 1.
let draw cr width height =
let r = 0.25 *. width in
set_source_rgba cr 0. 1. 0. 0.5;
arc cr (0.5 *. width) (0.35 *. height) ~r ~a1:0. ~a2:pi2;
fill cr;
set_source_rgba cr 1. 0. 0. 0.5;
arc cr (0.35 *. width) (0.65 *. height) ~r ~a1:0. ~a2:pi2;
fill cr;
set_source_rgba cr 0. 0. 1. 0.5;
arc cr (0.65 *. width) (0.65 *. height) ~r ~a1:0. ~a2:pi2;
fill cr;
;;
let expose drawing_area cr =
let allocation = drawing_area#misc#allocation in
draw cr (float allocation.Gtk.width) (float allocation.Gtk.height);
true
let () =
let _ = GMain.init () in
let w = GWindow.window ~title:"Cairo demo" ~width:500 ~height:400 () in
ignore(w#connect#destroy ~callback:GMain.quit);
let d = GMisc.drawing_area ~packing:w#add () in
ignore(d#misc#connect#draw ~callback:(expose d));
w#show();
GMain.main()
|
