Difference between revisions of "File:FermatSpiral.png"
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+ | <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> |
Latest revision as of 19:21, 9 September 2008
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
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current | 19:16, 9 September 2008 | 600 × 450 (45 KB) | Walter (talk | contribs) |
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