119 lines
3.0 KiB
Python
119 lines
3.0 KiB
Python
# Copyright (C) 2006, Red Hat, Inc.
|
|
#
|
|
# This library is free software; you can redistribute it and/or
|
|
# modify it under the terms of the GNU Lesser General Public
|
|
# License as published by the Free Software Foundation; either
|
|
# version 2 of the License, or (at your option) any later version.
|
|
#
|
|
# This library is distributed in the hope that it will be useful,
|
|
# but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
|
# Lesser General Public License for more details.
|
|
#
|
|
# You should have received a copy of the GNU Lesser General Public
|
|
# License along with this library; if not, write to the
|
|
# Free Software Foundation, Inc., 59 Temple Place - Suite 330,
|
|
# Boston, MA 02111-1307, USA.
|
|
|
|
import random
|
|
import math
|
|
|
|
import cairo
|
|
import hippo
|
|
|
|
_DISTANCE_THRESHOLD = 120.0
|
|
|
|
class SpreadBox(hippo.CanvasBox, hippo.CanvasItem):
|
|
__gtype_name__ = 'SugarSpreadBox'
|
|
|
|
def __init__(self, **kwargs):
|
|
hippo.CanvasBox.__init__(self, **kwargs)
|
|
|
|
self._items_to_position = []
|
|
self._spread_on_add = False
|
|
self._stable = False
|
|
|
|
def add_item(self, item):
|
|
self._items_to_position.append(item)
|
|
self.append(item, hippo.PACK_FIXED)
|
|
|
|
def remove_item(self, item):
|
|
if self._items_to_position.count(item) > 0:
|
|
self._items_to_position.remove(item)
|
|
self.remove(item)
|
|
|
|
def _get_distance(self, icon1, icon2):
|
|
[icon1_x, icon1_y] = self.get_position(icon1)
|
|
[icon2_x, icon2_y] = self.get_position(icon2)
|
|
|
|
a = icon1_x - icon2_x
|
|
b = icon1_y - icon2_y
|
|
|
|
return math.sqrt(a * a + b * b)
|
|
|
|
def _get_repulsion(self, icon1, icon2):
|
|
[icon1_x, icon1_y] = self.get_position(icon1)
|
|
[icon2_x, icon2_y] = self.get_position(icon2)
|
|
|
|
f_x = icon1_x - icon2_x
|
|
f_y = icon1_y - icon2_y
|
|
|
|
return [f_x, f_y]
|
|
|
|
def _clamp_position(self, icon, x, y):
|
|
x = max(0, x)
|
|
y = max(0, y)
|
|
|
|
[item_w, item_h] = icon.get_request()
|
|
[box_w, box_h] = self.get_allocation()
|
|
|
|
x = min(box_w - item_w, x)
|
|
y = min(box_h - item_h, y)
|
|
|
|
return [x, y]
|
|
|
|
def _spread_icons(self):
|
|
self._stable = True
|
|
|
|
for icon1 in self.get_children():
|
|
vx = 0
|
|
vy = 0
|
|
|
|
for icon2 in self.get_children():
|
|
if icon1 != icon2:
|
|
distance = self._get_distance(icon1, icon2)
|
|
if distance <= _DISTANCE_THRESHOLD:
|
|
self._stable = False
|
|
[f_x, f_y] = self._get_repulsion(icon1, icon2)
|
|
vx += f_x
|
|
vy += f_y
|
|
|
|
if vx != 0 or vy != 0:
|
|
[x, y] = self.get_position(icon1)
|
|
new_x = x + vx
|
|
new_y = y + vy
|
|
|
|
[new_x, new_y] = self._clamp_position(icon1, new_x, new_y)
|
|
|
|
self.move(icon1, new_x, new_y)
|
|
|
|
def do_allocate(self, width, height):
|
|
hippo.CanvasBox.do_allocate(self, width, height)
|
|
|
|
for item in self._items_to_position:
|
|
[item_w, item_h] = item.get_request()
|
|
|
|
x = int(random.random() * width - item_w)
|
|
y = int(random.random() * height - item_h)
|
|
|
|
[x, y] = self._clamp_position(item, x, y)
|
|
self.move(item, x, y)
|
|
|
|
self._items_to_position = []
|
|
|
|
tries = 10
|
|
self._spread_icons()
|
|
while not self._stable and tries > 0:
|
|
self._spread_icons()
|
|
tries -= 1
|