/src/wrappers/cairo/examples/simple/cairosimple.e

 1class CAIROSIMPLE
 2
 3insert
 4	CAIRO_FORMAT
 5
 6create {ANY}
 7	make
 8
 9feature {ANY}
10
11	pi: REAL is 3.14159265358979323846 -- PI
12
13	make
14		local
15			context: CAIRO_CONTEXT
16			surface: CAIRO_IMAGE_SURFACE
17			res: INTEGER
18		do
19			create surface.make (cairo_format_argb32, 300, 200)
20			create context.make (surface)
21			-- First draw something easy, say a redish rectangle
22			context.set_source_rgb (0.8, 0.2, 0.4)
23			context.rectangle (10, 10, 40, 80)
24			context.fill_preserve
25			context.set_source_rgb (0.4, 0.1, 0.2)
26			context.stroke
27			
28			-- Now a semitransparent circle
29			context.set_source_rgba (0.4, 0.8, 1.0, 0.5) -- alpha 1=opaque, 0=transparent
30			context.set_line_width (1.0)
31			context.arc (75, 75, 45, 0, 2 * pi)
32			context.fill_preserve
33			context.set_source_rgba (0, 0, 0, 0.5)
34			context.stroke
35			
36			-- Finally, write to a PNG file
37			res := surface.write_to_png ("cairosimple.png")
38			surface.finish
39		end
40
41end -- class CAIROSIMPLE
42
43
44-- Copyright (C) 2010-2017: Paolo Redaelli, 2013 Cyril Adrian
45
46-- This library is free software; you can redistribute it and/or
47-- modify it under the terms of the GNU Lesser General Public License
48-- as published by the Free Software Foundation; either version 2.1 of
49-- the License, or (at your option) any later version.
50--
51-- This library is distributed in the hope that it will be useful, but
52-- WITHOUT ANY WARRANTY; without even the implied warranty of
53-- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
54-- Lesser General Public License for more details.
55--
56-- You should have received a copy of the GNU Lesser General Public
57-- License along with this library; if not, write to the Free Software
58-- Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
59-- 02110-1301 USA
60