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(* This file is part of the tutorial
http://cairo.forge.ocamlcore.org/tutorial/
*)
let () =
let surface = Cairo.Image.create Cairo.Image.ARGB32 ~w:120 ~h:120 in
let cr = Cairo.create surface in
(* Examples are in 1.0 x 1.0 coordinate space *)
Cairo.scale cr 120. 120.;
(* Drawing code goes here *)
let linpat = Cairo.Pattern.create_linear ~x0:0. ~y0:0. ~x1:1. ~y1:1. in
Cairo.Pattern.add_color_stop_rgb linpat 0. 0.3 0.8;
Cairo.Pattern.add_color_stop_rgb linpat ~ofs:1. 0. 0.8 0.3;
let radpat = Cairo.Pattern.create_radial ~x0:0.5 ~y0:0.5 ~r0:0.25
~x1:0.5 ~y1:0.5 ~r1:0.75 in
Cairo.Pattern.add_color_stop_rgba radpat 0. 0. 0. 1.;
Cairo.Pattern.add_color_stop_rgba radpat ~ofs:0.5 0. 0. 0. 0.;
Cairo.set_source cr linpat;
Cairo.mask cr radpat;
(* Write output *)
Cairo.PNG.write surface "mask.png"
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