def isIntersected(line1, line2):
vector1 = Point.getVector(line2.startPoint, line1.startPoint)
vector2 = Point.getVector(line2.startPoint, line1.endPoint)
vector3 = Point.getVector(line2.startPoint, line2.endPoint)
if Point.crossProduct(vector1, vector3) * Point.crossProduct(vector2, vector3) > 0:
return False
vector1 = Point.getVector(line1.startPoint, line2.startPoint)
vector2 = Point.getVector(line1.startPoint, line2.endPoint)
vector3 = Point.getVector(line1.startPoint, line1.endPoint)
if Point.crossProduct(vector1, vector3) * Point.crossProduct(vector2, vector3) > 0:
return False
return True
