77 lines
1.7 KiB
Python
77 lines
1.7 KiB
Python
import random
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import math
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import cairo
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class SpreadLayout:
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DISTANCE_THRESHOLD = 120.0
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def __init__(self):
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pass
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def _get_distance(self, icon1, icon2):
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[icon1_x, icon1_y] = self._constraints[icon1]
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[icon2_x, icon2_y] = self._constraints[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._constraints[icon1]
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[icon2_x, icon2_y] = self._constraints[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 _spread_icons(self):
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self._stable = True
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for icon1 in self._icons:
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vx = 0
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vy = 0
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[x, y] = self._constraints[icon1]
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for icon2 in self._icons:
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if icon1 != icon2:
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distance = self._get_distance(icon1, icon2)
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if distance <= IconLayout.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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new_x = x + vx
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new_y = y + vy
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new_x = max(self._x1, new_x)
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new_y = max(self._y1, new_y)
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[width, height] = icon1.get_size_request()
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new_x = min(self._x2 - width, new_x)
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new_y = min(self._y2 - height, new_y)
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self._constraints[icon1] = [new_x, new_y]
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matrix = cairo.Matrix(1, 0, 0, 1, 0, 0)
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matrix.translate(new_x - (width / 2), new_y - (height / 2))
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icon1.set_transform(matrix)
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def update(self):
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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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def layout(self, box):
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[width, height] = box.get_allocation()
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for item in box.get_children():
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x = int(random.random() * width)
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y = int(random.random() * height)
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box.move(item, x, y)
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