def label_face(face, _attribute_, _font_, label_text, base_pts, labels, wire_frame):
"""Generate labels for a face or sub-face and add it to a list."""
face_prop = get_attr_nested(face, _attribute_)
# get a base plane and text height for the text label
cent_pt = face.geometry.center # base point for the text
base_plane = Plane(face.normal, cent_pt)
if base_plane.y.z < 0: # base plane pointing downwards; rotate it
base_plane = base_plane.rotate(base_plane.n, math.pi, base_plane.o)
if _txt_height_ is None: # auto-calculate default text height
txt_len = len(face_prop) if len(face_prop) > 10 else 10
largest_dim = max((face.geometry.max.x - face.geometry.min.x),
(face.geometry.max.y - face.geometry.min.y))
txt_h = largest_dim / (txt_len * 2)
else:
txt_h = _txt_height_
# move base plane origin a little to avoid overlaps of adjacent labels
if base_plane.n.x != 0:
m_vec = base_plane.y if base_plane.n.x < 0 else -base_plane.y
else:
m_vec = base_plane.y if base_plane.n.z < 0 else -base_plane.y
base_plane = base_plane.move(m_vec * txt_h)
# create the text label
label = text_objects(face_prop, base_plane, txt_h, font=_font_,
horizontal_alignment=1, vertical_alignment=3)
# append everything to the lists
label_text.append(face_prop)
base_pts.append(from_plane(base_plane))
labels.append(label)
wire_frame.extend(from_face3d_to_wireframe(face.geometry))
def test_move():
"""Test the Plane move method."""
pt = Point3D(2, 0, 2)
vec = Vector3D(0, 2, 0)
plane = Plane(vec, pt)
vec_1 = Vector3D(2, 2, 2)
new_plane = plane.move(vec_1)
assert new_plane.o == Point3D(4, 2, 4)
assert new_plane.n == Vector3D(0, 1, 0)
assert new_plane.x == plane.x
assert new_plane.y == plane.y
assert new_plane.k == 2
def test_linesegment3d_mutability():
"""Test the immutability of Plane objects."""
pt = Point3D(2, 0, 0)
vec = Vector3D(0, 2, 0)
plane = Plane(vec, pt)
assert isinstance(plane, Plane)
with pytest.raises(AttributeError):
plane.o.x = 3
with pytest.raises(AttributeError):
plane.n.x = 3
with pytest.raises(AttributeError):
plane.o = Point3D(0, 0, 0)
with pytest.raises(AttributeError):
plane.n = Vector3D(2, 2, 0)
# ensure operations that yield new objects are ok
plane_move = plane.move(Vector3D(-2, 0, 0))
assert plane_move.o == Point3D(0, 0, 0)