Dibujamos en el interior del widget.

1 files changed, 18 insertions, 0 deletions

diff --git a/cake.py b/cake.py
index 8abf1dc..8e2b967 100755
--- a/cake.py
+++ b/cake.py
@@ -1,5 +1,6 @@
 #!/usr/bin/env python
 # -*- encoding: utf8 -*-
+import math
 import gtk
 
 
@@ -10,9 +11,26 @@ class Cake(gtk.DrawingArea):
 
 
     def expose(self, widget, event):
+        context = widget.window.cairo_create()
+        # set a clip region for the expose event
+        context.rectangle(event.area.x, event.area.y, event.area.width, event.area.height)
+        context.clip()
+        self.draw(context)
         return False
 
 
+    def draw(self, context):
+        rect = self.get_allocation()
+        x = rect.x + rect.width / 2
+        y = rect.y + rect.height / 2
+        radius = min(rect.width / 2, rect.height / 2) - 5
+        context.arc(x, y, radius, 0, 2 * math.pi)
+        context.set_source_rgb(1, 1, 1)
+        context.fill_preserve()
+        context.set_source_rgb(0, 0, 0)
+        context.stroke()
+
+
 def main():
     window = gtk.Window()
     cake = Cake()