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# 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.
from array import array
from random import random
import hippo
_X_TILES = 120
_NUM_TRIALS = 100
class _Grid(object):
def __init__(self, x_tiles, y_tiles, cell_size):
self._array = array('B')
self.x_tiles = x_tiles
self.y_tiles = y_tiles
self.cell_size = cell_size
for i in range(self.y_tiles * self.x_tiles):
self._array.append(0)
def __getitem__(self, (row, col)):
return self._array[col + row * self.x_tiles]
def __setitem__(self, (row, col), value):
self._array[col + row * self.x_tiles] = value
def compute_weight_at(self, x, y, width, height):
weight = 0
for i in range(x, x + width):
for j in range(y, y + height):
weight += self[j, i]
return weight
def add_weight_at(self, x, y, width, height):
for i in range(x, x + width):
for j in range(y, y + height):
self[j, i] += 1
def remove_weight_at(self, x, y, width, height):
for i in range(x, x + width):
for j in range(y, y + height):
self[j, i] -= 1
class SpreadBox(hippo.CanvasBox, hippo.CanvasItem):
__gtype_name__ = 'SugarSpreadBox'
def __init__(self, **kwargs):
hippo.CanvasBox.__init__(self, **kwargs)
self._grid = None
self._center = None
self._width = -1
self._height = -1
def set_center_item(self, item):
if self._center:
self.remove(self._center)
self.append(item, hippo.PACK_FIXED)
self._center = item
self._layout_center()
def add_item(self, item):
self.append(item, hippo.PACK_FIXED)
self._layout_item(item)
def remove_item(self, item):
self.remove(item)
def _layout_item(self, item):
if not self._grid:
return
trials = _NUM_TRIALS
placed = False
while trials > 0 and not placed:
[width, height] = item.get_allocation()
cell_size = self._grid.cell_size
w = int(width / cell_size)
h = int(height / cell_size)
x = int(random() * (self._grid.x_tiles - w))
y = int(random() * (self._grid.y_tiles - h))
weight = self._grid.compute_weight_at(x, y, w, h)
if weight == 0:
self._grid.add_weight_at(x, y, w, h)
self.set_position(item, cell_size * x, cell_size * y)
placed = True
trials -= 1
def _layout(self):
for item in self.get_children():
if item != self._center:
self._layout_item(item)
def _layout_center(self):
if not self._center or not self._grid:
return
[width, height] = self._center.get_allocation()
x = (self._width - width) / 2
y = (self._height - height) / 2
self.set_position(self._center, x, y)
def do_allocate(self, width, height, origin_changed):
hippo.CanvasBox.do_allocate(self, width, height, origin_changed)
if width != self._width or height != self._height:
cell_size = width / _X_TILES
y_tiles = height / cell_size
self._grid = _Grid(_X_TILES, y_tiles, cell_size)
self._width = width
self._height = height
self._layout()
self._layout_center()
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