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File:FermatSpiral.png (view source)
Revision as of 19:21, 9 September 2008
, 19:21, 9 September 2008no edit summary
<pre>
def _calculate_position(self, radius, icon_size, index, children_count):
width, height = self.box.get_allocation()
# include an offset (8) to the index
# so that the center of the spiral is left blank
# angle = n * 137.5 degree or 2.4 radians
angle = (index + 8) * 2.4
# radius = constant * sqrt(n)
radius = (_MINIMUM_RADIUS / 5) * math.sqrt(index + 8)
x = radius * math.cos(angle) + (width - icon_size) / 2
y = radius * math.sin(angle) + (height - icon_size -
style.GRID_CELL_SIZE) / 2
return x, y
</pre>