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import math
import cairo
class SnowflakeLayout:
_BASE_RADIUS = 65
_CHILDREN_FACTOR = 1
_FLAKE_DISTANCE = 6
def __init__(self):
self._root = None
self._r = 0
def set_root(self, icon):
self._root = icon
def _layout_root(self, box):
[width, height] = self._root.get_allocation()
x = self._cx - (width / 2)
y = self._cy - (height / 2)
box.move(self._root, int(x), int(y))
def _layout_child(self, box, child, index):
r = self._r
if (len(box.get_children()) > 10):
r += SnowflakeLayout._FLAKE_DISTANCE * (index % 3)
angle = 2 * math.pi / len(box.get_children()) * index
[width, height] = child.get_allocation()
x = self._cx + math.cos(angle) * r - (width / 2)
y = self._cy + math.sin(angle) * r - (height / 2)
box.move(child, int(x), int(y))
def get_size(self, box):
max_child_size = 0
for child in box.get_children():
[width, height] = child.get_allocation()
max_child_size = max (max_child_size, width)
max_child_size = max (max_child_size, height)
return self._r * 2 + max_child_size + \
SnowflakeLayout._FLAKE_DISTANCE * 2
def layout(self, box):
self._r = SnowflakeLayout._BASE_RADIUS + \
SnowflakeLayout._CHILDREN_FACTOR * len(box.get_children())
size = self.get_size(box)
self._cx = size / 2
self._cy = size / 2
self._layout_root(box)
index = 0
for child in box.get_children():
self._layout_child(box, child, index)
index += 1
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