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import math
from sugar.scene.LayoutManager import LayoutManager
class CircleLayout(LayoutManager):
def __init__(self, radius):
LayoutManager.__init__(self)
self._radius = radius
self._angle = 0
def set_angle(self, angle):
self._angle = angle
def layout_group(self, group):
step = 2 * math.pi / len(group.get_actors())
angle = self._angle
for actor in group.get_actors():
self._update_position(actor, angle)
angle += step
def _update_position(self, actor, angle):
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))
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