def test_ccw_returns_zero_when_points_are_collinear(self):
# Act.
expected_ccw_value = sign(np.cross(self.p1_to_p2, self.p1_to_p3))
actual_ccw_value = sign(geom.ccw(self.p1, self.p2, self.p3))
# Assert.
self.assertEqual(expected_ccw_value, actual_ccw_value)
def test_ccw_returns_negative_value_when_angle_formed_has_negative_orientation(
self):
# Act.
expected_sign = sign(np.cross(self.p1_to_p4, self.p1_to_p2))
actual_sign = sign(geom.ccw(self.p4, self.p1, self.p2))
# Assert.
self.assertEqual(expected_sign, actual_sign)
def mouse_over(self, x, y):
from geometry import ccw
# to check if cursor is pointing at one of the switch-buttons,
# we just test if cursor position is inside polygon, by checking if
# all segments are in counter-clockwise order to cursor position:
for j, element in enumerate(self.points):
for i, point in enumerate(element):
if i == len(element) - 1:
edge = (point, element[0], (x, y))
else:
edge = (point, element[i + 1], (x, y))
if ccw(edge):
break
else:
self.active_button = j
return True
self.active_button = None
return False
def contains_wn(self, point):
size = len(self.vertices)
if size == 0:
return False
s = 0.0
for i in range(0, size - 1):
v1 = self.vertices[i].p
if point == v1:
return True
v2 = self.vertices[i + 1].p
if point == v2:
return True
if ccw(point, v1, v2):
s += angle(v1, point, v2)
else:
s -= angle(v1, point, v2)
s = s.real
print(s)
print(fabs(fabs(s) - 2 * PI))
return fabs(fabs(s) - 2 * PI) < EPS