def __init__(self, x, y, sides, length, color=None):
assert sides >= 3, "Number of sides must be greater than or equal to 3"
assert length > 0, "Length of sides must be greater than 0 "
self._vertices = []
self._sides = sides
self._side_length = length
self.side_angle = (2 * PI) / self.sides
self.radius = self.side_length * sin(.5 * (PI - self.side_angle)) / \
sin(self.side_angle)
for i in range(self.sides):
self.vertices.append((int(round(x + self.radius * cos(
self.side_angle * i))), int(round(y + self.radius * sin(self.side_angle * i)))))
(xs, ys) = zip(*self.vertices)
super(RegPolygon, self).__init__(xs, ys, len(self.vertices), color=color)
def _get_sideLength(self, l):
assert l > 0, "Length of sides must be greater than 0"
self._sideLength = l
self.radius = self._sideLength * sin(0.5 * (PI - self.sideAngle)) / sin(self.sideAngle)
