def transform(self, m: Matrix44) -> "Arc":
"""Transform ARC entity by transformation matrix `m` inplace.
Raises ``NonUniformScalingError()`` for non uniform scaling.
"""
ocs = OCSTransform(self.dxf.extrusion, m)
super()._transform(ocs)
s: float = self.dxf.start_angle
e: float = self.dxf.end_angle
if not math.isclose(arc_angle_span_deg(s, e), 360.0):
(
self.dxf.start_angle,
self.dxf.end_angle,
) = ocs.transform_ccw_arc_angles_deg(s, e)
self.post_transform(m)
return self
def test_reflections(self, s, e, rotation, sx, sy):
m = Matrix44.chain(
Matrix44.scale(sx, sy, 1),
Matrix44.z_rotate(rotation),
)
expected_start = m.transform(Vec3.from_deg_angle(s))
expected_end = m.transform(Vec3.from_deg_angle(e))
expected_angle_span = arc_angle_span_deg(s, e)
ocs = OCSTransform(Z_AXIS, m)
new_s, new_e = ocs.transform_ccw_arc_angles_deg(s, e)
wcs_start = ocs.new_ocs.to_wcs(Vec3.from_deg_angle(new_s))
wcs_end = ocs.new_ocs.to_wcs(Vec3.from_deg_angle(new_e))
assert arc_angle_span_deg(new_s, new_e) == pytest.approx(
expected_angle_span
)
assert wcs_start.isclose(expected_start)
assert wcs_end.isclose(expected_end)
def test_rotation(self, s, e, rotation):
ocs = OCSTransform(Z_AXIS, Matrix44.z_rotate(math.radians(rotation)))
new_angles = normalize_angles(*ocs.transform_ccw_arc_angles_deg(s, e))
assert new_angles == pytest.approx(
normalize_angles(s + rotation, e + rotation)
)
def test_no_transformation(self, s, e):
ocs = OCSTransform(Z_AXIS, Matrix44())
assert ocs.transform_ccw_arc_angles_deg(s, e) == pytest.approx([s, e])
