def get_angle(self, index):
index %= len(self.points)
cur_p = self.points[index]
prev_p = self.points[(index - 1) % len(self.points)]
next_p = self.points[(index + 1) % len(self.points)]
angle = Edge.angle_points(prev_p, cur_p, next_p)
if next_p.classify(prev_p, cur_p) is symbols.left:
angle = (math.pi * 2.0) - angle
return angle
def test_angles(self):
p2 = Point(1, 2)
p1 = p2 + Point(4, 4)
p3 = p2 + Point(-3, 3)
self.assertAlmostEqual(Edge.angle_points(p1, p2, p3), math.pi / 2, delta=eps)