def center_of_3points_arc(point1: 'Vertex', point2: 'Vertex', point3: 'Vertex') -> Vector:
"""
Calc center point of 3 point arc. ConstructionCircle is defined by 3 points on the circle: point1, point2 and point3.
"""
ray1 = ConstructionRay(point1, point2)
ray2 = ConstructionRay(point1, point3)
midpoint1 = lerp(point1, point2)
midpoint2 = lerp(point1, point3)
center_ray1 = ray1.orthogonal(midpoint1)
center_ray2 = ray2.orthogonal(midpoint2)
return center_ray1.intersect(center_ray2)
def test_init_with_angle(self):
point = (10, 10)
ray = ConstructionRay(point, angle=0)
ray_normal = ray.orthogonal(point)
assert ray_normal._is_vertical is True
ray = ConstructionRay(point, angle=-HALF_PI)
assert ray._is_horizontal is False
assert ray._is_vertical is True
def test_ray2d_normal(self):
ray = ConstructionRay((-10, 3), (17, -7))
ortho = ray.orthogonal((3, 3))
point = ray.intersect(ortho)
assert point.isclose(Vector(1.4318, -1.234), abs_tol=1e-4)
def test_ray2d_normal_vertical(self):
ray = ConstructionRay((10, 1), (10, -7)) # vertical line
ortho = ray.orthogonal((3, 3))
point = ray.intersect(ortho)
assert point.isclose(Vector(10, 3))
def test_ray2d_normal_horizontal(self):
ray = ConstructionRay((10, 10), (20, 10)) # horizontal line
ortho = ray.orthogonal((3, 3))
point = ray.intersect(ortho)
assert point.isclose(Vector(3, 10))
def _get_point_on_dimline(point: 'Vertex',
dimray: ConstructionRay) -> Vector:
""" get the measure target point projection on the dimension line """
return dimray.intersect(dimray.orthogonal(point))