def test_mesh2d_init_from_polygon_triangulated_incorrect():
"""Test the initalization of Mesh2D from_polygon_triangulated."""
verts = (Point2D(0, 0), Point2D(2, 0), Point2D(2, 1), Point2D(1, 1),
Point2D(1, 2), Point2D(2, 0))
polygon = Polygon2D(verts)
with pytest.raises(ValueError):
Mesh2D.from_polygon_triangulated(polygon)
def test_mesh2d_init_from_polygon_triangulated_concave():
"""Test Mesh2D from_polygon_triangulated with a concave polygon."""
verts = (Point2D(0, 0), Point2D(2, 0), Point2D(2, 1), Point2D(1, 1),
Point2D(1, 2), Point2D(0, 2))
polygon = Polygon2D(verts)
mesh_1 = Mesh2D.from_polygon_triangulated(polygon)
mesh_2 = Mesh2D.from_polygon_triangulated(polygon, False)
assert len(mesh_1.vertices) == 6
assert len(mesh_2.vertices) == 12
assert len(mesh_1.faces) == len(mesh_2.faces) == 4
assert mesh_1.area == mesh_2.area == 3
assert mesh_1.min == mesh_2.min == Point2D(0, 0)
assert mesh_1.max == mesh_2.max == Point2D(2, 2)
assert mesh_1.center == mesh_2.center == Point2D(1, 1)
assert mesh_1.centroid.x == mesh_2.centroid.x == pytest.approx(0.8333, rel=1e-2)
assert mesh_1.centroid.y == mesh_2.centroid.y == pytest.approx(0.8333, rel=1e-2)
assert len(mesh_1.face_areas) == len(mesh_2.face_areas) == 4
assert len(mesh_1.face_centroids) == len(mesh_2.face_centroids) == 4
def test_mesh2d_init_from_polygon_triangulated_colinear():
"""Test Mesh2D from_polygon_triangulated with some colinear vertices."""
verts = (Point2D(0, 0), Point2D(0, 2), Point2D(2, 2), Point2D(4, 0), Point2D(2, 0))
polygon = Polygon2D(verts)
mesh = Mesh2D.from_polygon_triangulated(polygon)
assert len(mesh.vertices) == 5
assert len(mesh.faces) == 3
assert mesh.area == 6
assert mesh.min == Point2D(0, 0)
assert mesh.max == Point2D(4, 2)
assert mesh.center == Point2D(2, 1)
assert mesh.centroid.x == pytest.approx(1.56, rel=1e-2)
assert mesh.centroid.y == pytest.approx(0.89, rel=1e-2)
def test_mesh2d_init_from_polygon_triangulated():
"""Test the initalization of Mesh2D from_polygon_triangulated."""
verts = (Point2D(0, 0), Point2D(0, 2), Point2D(2, 2), Point2D(4, 0))
polygon = Polygon2D(verts)
mesh = Mesh2D.from_polygon_triangulated(polygon)
assert len(mesh.vertices) == 4
assert len(mesh.faces) == 2
assert mesh.area == 6
assert mesh.min == Point2D(0, 0)
assert mesh.max == Point2D(4, 2)
assert mesh.center == Point2D(2, 1)
assert mesh.centroid.x == pytest.approx(1.56, rel=1e-2)
assert mesh.centroid.y == pytest.approx(0.89, rel=1e-2)
assert len(mesh.face_areas) == 2
assert mesh.face_areas[0] == 2
assert mesh.face_areas[1] == 4
assert len(mesh.face_centroids) == 2
assert mesh._is_color_by_face is False
assert mesh.colors is None
