cairo.example source code

1 module cairo.example;
2 
3 import cairo;
4 import std.getopt, std.stdio, core.runtime;
5 version(GTK)
6     import cairo.examples.gtk;
7 
8 
9 alias DrawFunction = void function(Context ctx);
10 
11 enum Output
12 {
13     _auto,
14     gtk,
15     png
16 }
17 
18 void runExample(DrawFunction draw)
19 {
20     auto args = Runtime.args;
21 
22     Output output = Output._auto;
23     getopt(
24         args,
25         "output",  &output);
26 
27     final switch(output)
28     {
29         case Output._auto:
30             version(GTK)
31                 gtkRunExample(draw);
32             else static if(CAIRO_HAS_PNG_FUNCTIONS)
33                 pngRunExample(draw);
34             else
35                 writeln("No useable backend compiled in");
36             break;
37         case Output.gtk:
38             version(GTK)
39                 gtkRunExample(draw);
40             else
41                 writeln("GTK support not compiled in");
42             break;
43         case Output.png:
44             static if(CAIRO_HAS_PNG_FUNCTIONS)
45                 pngRunExample(draw);
46             else
47                 writeln("PNG support not compiled in");
48             break;
49     }
50 }
51 
52 static if(CAIRO_HAS_PNG_FUNCTIONS)
53 {
54     void pngRunExample(DrawFunction draw)
55     {
56         auto surface = new ImageSurface(Format.CAIRO_FORMAT_ARGB32, 400, 400);
57         auto context = Context(surface);
58         draw(context);
59         surface.writeToPNG("example.png");
60         surface.dispose();
61         writeln("Wrote result to example.png");
62     }
63 }