Some work on the donut...

shell/HomeWindow.py

@@ -2,6 +2,15 @@ import gtk
 import goocanvas
 
 from sugar.canvas.IconItem import IconItem
+from sugar.canvas.DonutItem import DonutItem
+
+class TasksItem(DonutItem):
+	def __init__(self):
+		DonutItem.__init__(self, 200)
+		self.add_piece(30)
+		self.add_piece(30)
+		self.add_piece(30)
+		self.add_piece(10)
 
 class ActivityItem(IconItem):
 	def __init__(self, activity):
@@ -57,6 +66,10 @@ class Model(goocanvas.CanvasModelSimple):
 		activity_bar.translate(50, 860)
 		root.add_child(activity_bar)
 
+		tasks = TasksItem()
+		tasks.translate(600, 450)
+		root.add_child(tasks)
+
 class HomeWindow(gtk.Window):
 	def __init__(self, shell):
 		gtk.Window.__init__(self)

sugar/canvas/DonutItem.py

@@ -0,0 +1,49 @@
+import math
+
+import goocanvas
+
+class PieceItem(goocanvas.Path):
+	def __init__(self, angle_start, angle_end, **kwargs):
+		goocanvas.Path.__init__(self, **kwargs)
+		self._angle_start = angle_start
+		self._angle_end = angle_end
+
+	def construct(self):
+		r = self.get_parent().get_radius()
+
+		data = 'M0,0 '
+
+		dx = r * math.cos(self._angle_start)
+		dy = - r * math.sin(self._angle_start)
+
+		data += 'l%f,%f ' % (dx, dy)
+
+		dx = r * math.cos(self._angle_end)
+		dy = - r * math.sin(self._angle_end)
+
+		data += 'A%f,%f 0 0,0 %f,%f ' % (r, r, dx, dy)
+
+		data += 'z'
+
+		print data
+
+		self.set_property('data', data)
+
+class DonutItem(goocanvas.Group):
+	def __init__(self, radius, **kwargs):
+		goocanvas.Group.__init__(self, **kwargs)
+		self._radius = radius
+		self._angle_start = 0
+
+	def add_piece(self, perc):
+		angle_end = self._angle_start + perc * 2 * math.pi / 100
+		piece_item = PieceItem(self._angle_start, angle_end)
+		self._angle_start = angle_end
+
+		# FIXME can't override set_parent on the
+		# PieceItem and there is no signal.
+		self.add_child(piece_item)
+		piece_item.construct()
+
+	def get_radius(self):
+		return self._radius