1 //
2 //
3 //	Mono.Cairo drawing samples using image (png) as drawing surface
4 //	Author: Hisham Mardam Bey <hisham@hisham.cc>
5 //
6 
7 //
8 // Copyright (C) 2004 Novell, Inc (http://www.novell.com)
9 //
10 // Permission is hereby granted, free of charge, to any person obtaining
11 // a copy of this software and associated documentation files (the
12 // "Software"), to deal in the Software without restriction, including
13 // without limitation the rights to use, copy, modify, merge, publish,
14 // distribute, sublicense, and/or sell copies of the Software, and to
15 // permit persons to whom the Software is furnished to do so, subject to
16 // the following conditions:
17 //
18 // The above copyright notice and this permission notice shall be
19 // included in all copies or substantial portions of the Software.
20 //
21 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
22 // EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
23 // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
24 // NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
25 // LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
26 // OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
27 // WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
28 //
29 
30 using System;
31 using Cairo;
32 
33 public class CairoTest
34 {
35 	static readonly double  M_PI = 3.14159265358979323846;
36 
draw(Cairo.Context gr, int width, int height)37 	static void draw (Cairo.Context gr, int width, int height)
38 	{
39 		double xc = 0.5;
40 		double yc = 0.5;
41 		double radius = 0.4;
42 		double angle1 = 45.0  * (M_PI/180.0);  /* angles are specified */
43 		double angle2 = 180.0 * (M_PI/180.0);  /* in radians           */
44 
45 		gr.Scale (width, height);
46 		gr.LineWidth = 0.04;
47 
48 		gr.ArcNegative (xc, yc, radius, angle1, angle2);
49 		gr.Stroke ();
50 
51 		/* draw helping lines */
52 		gr.Color = new Color(1, 0.2, 0.2, 0.6);
53 		gr.Arc (xc, yc, 0.05, 0, 2*M_PI);
54 		gr.Fill ();
55 		gr.LineWidth = 0.03;
56 		gr.Arc (xc, yc, radius, angle1, angle1);
57 		gr.LineTo (new PointD(xc, yc));
58 		gr.Arc (xc, yc, radius, angle2, angle2);
59 		gr.LineTo (new PointD(xc, yc));
60 		gr.Stroke ();
61 	}
62 
63 
Main()64 	static void Main ()
65 	{
66 		Surface s = new ImageSurface (Format.ARGB32, 500, 500);
67 		Cairo.Context g = new Cairo.Context (s);
68 
69 		draw (g, 500, 500);
70 
71 		s.WriteToPng ("arcneg.png");
72 	}
73 }
74