97 lines
2.1 KiB
Python
97 lines
2.1 KiB
Python
import random
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import math
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import cairo
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import hippo
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_DISTANCE_THRESHOLD = 120.0
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class SpreadBox(hippo.CanvasBox, hippo.CanvasItem):
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__gtype_name__ = 'SugarSpreadBox'
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def __init__(self, **kwargs):
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hippo.CanvasBox.__init__(self, **kwargs)
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self._items_to_position = []
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self._spread_on_add = False
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self._stable = False
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def add(self, item):
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self._items_to_position.append(item)
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self.append(item, hippo.PACK_FIXED)
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def _get_distance(self, icon1, icon2):
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[icon1_x, icon1_y] = self.get_position(icon1)
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[icon2_x, icon2_y] = self.get_position(icon2)
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a = icon1_x - icon2_x
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b = icon1_y - icon2_y
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return math.sqrt(a * a + b * b)
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def _get_repulsion(self, icon1, icon2):
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[icon1_x, icon1_y] = self.get_position(icon1)
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[icon2_x, icon2_y] = self.get_position(icon2)
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f_x = icon1_x - icon2_x
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f_y = icon1_y - icon2_y
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return [f_x, f_y]
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def _clamp_position(self, icon, x, y):
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x = max(0, x)
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y = max(0, y)
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[item_w, item_h] = icon.get_request()
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[box_w, box_h] = self.get_allocation()
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x = min(box_w - item_w, x)
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y = min(box_h - item_h, y)
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return [x, y]
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def _spread_icons(self):
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self._stable = True
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for icon1 in self.get_children():
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vx = 0
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vy = 0
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for icon2 in self.get_children():
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if icon1 != icon2:
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distance = self._get_distance(icon1, icon2)
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if distance <= _DISTANCE_THRESHOLD:
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self._stable = False
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[f_x, f_y] = self._get_repulsion(icon1, icon2)
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vx += f_x
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vy += f_y
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if vx != 0 or vy != 0:
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[x, y] = self.get_position(icon1)
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new_x = x + vx
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new_y = y + vy
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[new_x, new_y] = self._clamp_position(icon1, new_x, new_y)
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self.move(icon1, new_x, new_y)
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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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for item in self._items_to_position:
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[item_w, item_h] = item.get_request()
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x = int(random.random() * width - item_w)
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y = int(random.random() * height - item_h)
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[x, y] = self._clamp_position(item, x, y)
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self.move(item, x, y)
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self._items_to_position = []
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tries = 10
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self._spread_icons()
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while not self._stable and tries > 0:
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self._spread_icons()
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tries -= 1
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