demos/GaussianBlurDemo.vala

   1 /*
   2     Copyright 2009 by Hans Baier
   3     License: LGPLv2+
   4 */
   5
   6 using Gtk;
   7
   8 namespace Prolooks {
   9
  10     public class GaussianBlurDemo : DrawingArea {
  11
  12         public GaussianBlurDemo () {
  13             // Set favored widget size
  14             set_size_request (100, 100);
  15                         draw.connect(on_draw);
  16         }
  17
  18         /* Widget is asked to draw itself */
  19                 public bool on_draw (Cairo.Context cr) {
  20                         Gtk.Allocation allocation;
  21                         get_allocation(out allocation);
  22
  23                         SimpleKnobImageSource knob = new SimpleKnobImageSource();
  24
  25                         double knob_width  = knob.get_knob_width ();
  26                         double knob_height = knob.get_knob_height ();
  27
  28                         Cairo.ImageSurface surface = new Cairo.ImageSurface (Cairo.Format.ARGB32, (int) knob_width, (int) knob_height);
  29                         Cairo.Context knobcr = new Cairo.Context (surface);
  30                         knobcr.set_source_rgba (1, 1, 1, 0.0);
  31                         knobcr.paint ();
  32                         knob.paint_knob (knobcr, KnobMode.BIPOLAR, 0, knob.get_line_width(), knob.get_radius(), knob_width / 2, knob_height / 2);
  33
  34                         cr.set_source_rgb (0, 0, 0);
  35
  36 //                      Gdk.Pixbuf pixbuf = cairo_image_surface_to_pixbuf (surface);
  37 //                      draw_pixbuf_with_shadow (cr, pixbuf, allocation.width/2 - knob_width/2, allocation.height/2 - knob_height/2, knob_width, knob_height, 0, 3);
  38                         draw_image_surface_with_shadow (cr, surface, allocation.width/2 - knob_width/2, allocation.height/2 - knob_height/2, knob_width, knob_height, 0, 3);
  39
  40             return false;
  41         }
  42     }
  43
  44     static int main (string[] args) {
  45         Gtk.init (ref args);
  46         var window = new Window (WindowType.TOPLEVEL);
  47
  48         var gaussianBlurDemo = new GaussianBlurDemo();
  49
  50         window.add (gaussianBlurDemo);
  51         window.destroy.connect(Gtk.main_quit);
  52         window.show_all ();
  53         Gtk.main ();
  54         return 0;
  55     }
  56 } // namespace Prolooks