80 lines
1.9 KiB
Python
80 lines
1.9 KiB
Python
import math
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import cairo
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import hippo
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_BASE_RADIUS = 65
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_CHILDREN_FACTOR = 1
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_FLAKE_DISTANCE = 6
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class SnowflakeBox(hippo.CanvasBox, hippo.CanvasItem):
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__gtype_name__ = 'SugarSnowflakeBox'
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def __init__(self, **kwargs):
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hippo.CanvasBox.__init__(self, **kwargs)
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self._root = None
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def set_root(self, icon):
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self._root = icon
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def _get_center(self):
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[width, height] = self.get_allocation()
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return [width / 2, height / 2]
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def _get_radius(self):
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return _BASE_RADIUS + _CHILDREN_FACTOR * self._get_n_children()
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def _layout_root(self):
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[width, height] = self._root.get_allocation()
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[cx, cy] = self._get_center()
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x = cx - (width / 2)
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y = cy - (height / 2)
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self.move(self._root, int(x), int(y))
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def _get_n_children(self):
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return len(self.get_children()) - 1
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def _layout_child(self, child, index):
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r = self._get_radius()
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if (self._get_n_children() > 10):
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r += _FLAKE_DISTANCE * (index % 3)
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angle = 2 * math.pi * index / self._get_n_children()
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[width, height] = child.get_allocation()
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[cx, cy] = self._get_center()
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x = cx + math.cos(angle) * r - (width / 2)
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y = cy + math.sin(angle) * r - (height / 2)
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self.move(child, int(x), int(y))
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def do_get_width_request(self):
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hippo.CanvasBox.do_get_width_request(self)
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max_child_size = 0
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for child in self.get_children():
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width = child.get_width_request()
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height = child.get_height_request(width)
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max_child_size = max (max_child_size, width)
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max_child_size = max (max_child_size, height)
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return self._get_radius() * 2 + \
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max_child_size + _FLAKE_DISTANCE * 2
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def do_get_height_request(self, width):
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hippo.CanvasBox.do_get_height_request(self, width)
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return width
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def do_allocate(self, width, height):
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hippo.CanvasBox.do_allocate(self, width, height)
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self._layout_root()
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index = 0
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for child in self.get_children():
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if child != self._root:
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self._layout_child(child, index)
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index += 1
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