Small improvements

examples/scene/scene.py

@@ -15,7 +15,7 @@ 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
+	angle = math.pi * 2 * frame_num / timeline.get_n_frames()
 	group.get_layout().set_angle(angle)
 	group.do_layout()
 
@@ -55,7 +55,7 @@ drawing_area.show()
 
 window.show()
 
-timeline = Timeline(stage, 100)
+timeline = Timeline(stage, 300)
 timeline.connect('next-frame', __next_frame_cb, icons_group)
 timeline.connect('completed', __completed_cb, icons_group)
 timeline.start()

sugar/scene/CircleLayout.py

@@ -3,10 +3,10 @@ import math
 from sugar.scene.LayoutManager import LayoutManager
 
 class CircleLayout(LayoutManager):
-	def __init__(self, radium):
+	def __init__(self, radius):
 		LayoutManager.__init__(self)
 
-		self._radium = radium
+		self._radius = radius
 		self._angle = 0
 
 	def set_angle(self, angle):
@@ -20,6 +20,6 @@ class CircleLayout(LayoutManager):
 			angle += step
 
 	def _update_position(self, actor, angle):
-		x = math.cos(angle) * self._radium + self._radium
-		y = math.sin(angle) * self._radium + self._radium
-		actor.set_position(int(x), int(y))
+		x = math.cos(angle) * self._radius + self._radius
+		y = math.sin(angle) * self._radius + self._radius
+		actor.set_position(int(x + 0.5), int(y + 0.5))