Implement basic animation

examples/scene/scene.py

@@ -1,4 +1,5 @@
 #!/usr/bin/python
+import math
 
 import pygtk
 pygtk.require('2.0')
@@ -8,10 +9,24 @@ from sugar.scene.Stage import Stage
 from sugar.scene.Group import Group
 from sugar.scene.PixbufActor import PixbufActor
 from sugar.scene.CircleLayout import CircleLayout
+from sugar.scene.Timeline import Timeline
 
-def drawing_area_expose_cb(widget, event, stage):
+def __drawing_area_expose_cb(widget, event, stage):
 	stage.render(widget.window)
 
+def __next_frame_cb(timeline, frame_num, group):
+	angle = math.pi * 2 / timeline.get_n_frames() * frame_num
+	group.get_layout().set_angle(angle)
+	group.do_layout()
+
+	drawing_area.window.invalidate_rect(None, False)
+
+def __completed_cb(timeline, group):
+	group.get_layout().set_angle(0)
+	group.do_layout()
+
+	drawing_area.window.invalidate_rect(None, False)
+
 stage = Stage()
 
 pixbuf = gtk.gdk.pixbuf_new_from_file('background.png')
@@ -26,7 +41,7 @@ while i <= 5:
 	i += 1
 
 layout = CircleLayout(100)
-icons_group.set_layout_manager(layout)
+icons_group.set_layout(layout)
 
 stage.add(icons_group)
 
@@ -34,10 +49,15 @@ window = gtk.Window()
 window.set_default_size(640, 480)
 
 drawing_area = gtk.DrawingArea()
-drawing_area.connect('expose_event', drawing_area_expose_cb, stage)
+drawing_area.connect('expose_event', __drawing_area_expose_cb, stage)
 window.add(drawing_area)
 drawing_area.show()
 
 window.show()
 
+timeline = Timeline(stage, 100)
+timeline.connect('next-frame', __next_frame_cb, icons_group)
+timeline.connect('completed', __completed_cb, icons_group)
+timeline.start()
+
 gtk.main()