133 lines
3.8 KiB
Python
133 lines
3.8 KiB
Python
# Copyright (C) 2006, Red Hat, Inc.
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#
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# This library is free software; you can redistribute it and/or
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# modify it under the terms of the GNU Lesser General Public
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# License as published by the Free Software Foundation; either
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# version 2 of the License, or (at your option) any later version.
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#
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# This library is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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# Lesser General Public License for more details.
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#
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# You should have received a copy of the GNU Lesser General Public
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# License along with this library; if not, write to the
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# Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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# Boston, MA 02111-1307, USA.
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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 = 10.0
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_FORCE_CONSTANT = 0.1
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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._stable = False
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def add_item(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 remove_item(self, item):
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if self._items_to_position.count(item) > 0:
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self._items_to_position.remove(item)
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self.remove(item)
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def _get_item_radius(self, item):
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[width, height] = item.get_request()
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return math.sqrt(width ** 2 + height ** 2) / 2
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def _get_item_center(self, item):
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[width, height] = item.get_request()
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[x, y] = self.get_position(item)
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c_x = int(x + float(width) / 2.0)
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c_y = int(y + float(height) / 2.0)
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return [c_x, c_y]
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def _get_repulsion(self, icon1, icon2):
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[c1_x, c1_y] = self._get_item_center(icon1)
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[c2_x, c2_y] = self._get_item_center(icon2)
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a = c2_x - c1_x
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b = c2_y - c1_y
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r1 = self._get_item_radius(icon1)
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r2 = self._get_item_radius(icon2)
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distance = math.sqrt(a ** 2 + b ** 2) - r1 - r2
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if distance < _DISTANCE_THRESHOLD:
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f_x = int(math.ceil(-_FORCE_CONSTANT * float(a)))
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f_y = int(math.ceil(-_FORCE_CONSTANT * float(b)))
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else:
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f_x = 0
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f_y = 0
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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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[f_x, f_y] = self._get_repulsion(icon1, icon2)
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if f_x != 0 or f_y != 0:
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self._stable = False
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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 = 20
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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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