def contains(self, p):
"""Returns True if p is inside self."""
if self.isConvex():
# If convex, use CCW-esque algorithm
inside = False
p1 = self.points[0]
for i in range(self.n + 1):
p2 = self.points[i % self.n]
if p.y > min(p1.y, p2.y):
if p.y <= max(p1.y, p2.y):
if p.x <= max(p1.x, p2.x):
if p1.y != p2.y:
xints = (p.y - p1.y) * \
(p2.x - p1.x) / (p2.y - p1.y) + p1.x
if p1.x == p2.x or p.x <= xints:
inside = not inside
p1 = p2
return inside
else:
# If concave, must triangulate and check individual triangles
triangles = spatial.triangulatePolygon(self)
for triangle in triangles:
if triangle.contains(p):
return True
return False
def contains(self, p):
"""Returns True if p is inside self."""
if self.isConvex():
# If convex, use CCW-esque algorithm
inside = False
p1 = self.points[0]
for i in range(self.n + 1):
p2 = self.points[i % self.n]
if p.y > min(p1.y, p2.y):
if p.y <= max(p1.y, p2.y):
if p.x <= max(p1.x, p2.x):
if p1.y != p2.y:
xints = (p.y - p1.y) * \
(p2.x - p1.x) / (p2.y - p1.y) + p1.x
if p1.x == p2.x or p.x <= xints:
inside = not inside
p1 = p2
return inside
else:
# If concave, must triangulate and check individual triangles
triangles = spatial.triangulatePolygon(self)
for triangle in triangles:
if triangle.contains(p):
return True
return False
def smartInteriorPoint(self):
"""Returns a random interior point via triangulation."""
triangles = spatial.triangulatePolygon(self)
areas = [t.area() for t in triangles]
total = sum(areas)
probabilities = [area / total for area in areas]
# Sample triangle according to area
r = random()
count = 0
for (triangle, prob) in zip(triangles, probabilities):
count += prob
if count >= r:
return triangle.interiorPoint()
def smartInteriorPoint(self):
"""Returns a random interior point via triangulation."""
triangles = spatial.triangulatePolygon(self)
areas = [t.area() for t in triangles]
total = sum(areas)
probabilities = [area / total for area in areas]
# Sample triangle according to area
r = random()
count = 0
for (triangle, prob) in zip(triangles, probabilities):
count += prob
if count >= r:
return triangle.interiorPoint()
def area(self):
"""Returns the area of the polygon."""
triangles = spatial.triangulatePolygon(self)
areas = [t.area() for t in triangles]
return sum(areas)
def area(self):
"""Returns the area of the polygon."""
triangles = spatial.triangulatePolygon(self)
areas = [t.area() for t in triangles]
return sum(areas)
