def test_closed_square_inside():
vertices = [(0, 0), (5, 0), (5, 5), (0, 5)]
result = list(offset_vertices_2d(vertices, 1, closed=True))
assert result[0] == (1, 1)
assert result[1] == (4, 1)
assert result[2] == (4, 4)
assert result[3] == (1, 4)
def test_closed_shape_with_collinear_last_segment():
vertices = [(0, 0), (5, 0), (5, 5), (-5, 5), (-5, 0)]
result = list(offset_vertices_2d(vertices, 1, closed=True))
assert len(result) == len(vertices)
assert result[0] == (0, 1)
assert result[1] == (4, 1)
assert result[2] == (4, 4)
assert result[3] == (-4, 4)
assert result[4] == (-4, 1)
def test_3_horiz_collinear_vertices_closed():
vertices = [(1, 2), (5, 2), (9, 2)]
result = list(offset_vertices_2d(vertices, 1, closed=True))
assert len(result) == len(vertices)+2 # get 2 extra vertices
# but the first vertex, would be expected as last vertex
assert result[0] == (1, 1)
assert result[1] == (1, 3)
assert result[2] == (5, 3)
# closing segment: (9, 2) -> (1, 2)
assert result[3] == (9, 3)
assert result[4] == (9, 1)
def test_0_offset():
vertices = [(1, 2, 3), (5, 2, 3)]
result = list(offset_vertices_2d(vertices, 0))
assert result[0] == (1, 2)
assert result[1] == (5, 2)
def test_closed_triangle_inside():
vertices = [(0, 0), (5, 0), (2.5, 5)]
result = list(offset_vertices_2d(vertices, 1, closed=True))
assert result[0].isclose(Vec2((1.618, 1)), abs_tol=PRECISION)
assert result[1].isclose(Vec2((3.382, 1)), abs_tol=PRECISION)
assert result[2].isclose(Vec2((2.5, 2.7639)), abs_tol=PRECISION)
def test_3_vertices():
vertices = [(0, 0), (300, 150), (450, 50)]
result = list(offset_vertices_2d(vertices, 10))
assert result[0].isclose(Vec2((-4.4721, 8.9443)), abs_tol=PRECISION)
assert result[1].isclose(Vec2((300.7184, 161.5396)), abs_tol=PRECISION)
assert result[2].isclose(Vec2((455.547, 58.3205)), abs_tol=PRECISION)
def test_3_vert_collinear_vertices():
vertices = [(1, 2), (1, 5), (1, 9)]
result = list(offset_vertices_2d(vertices, 1))
assert result[0] == (0, 2)
assert result[1] == (0, 5)
assert result[2] == (0, 9)
def test_3_horiz_collinear_vertices():
vertices = [(1, 2), (5, 2), (9, 2)]
result = list(offset_vertices_2d(vertices, 1))
assert result[0] == (1, 3)
assert result[1] == (5, 3)
assert result[2] == (9, 3)
def test_2_vert_vertices_right_offset():
vertices = [(1, 2), (1, 5)]
result = list(offset_vertices_2d(vertices, -1))
assert result[0] == (2, 2)
assert result[1] == (2, 5)
def test_2_vert_vertices_left_offset():
vertices = [(1, 2), (1, 5)]
result = list(offset_vertices_2d(vertices, 1))
assert result[0] == (0, 2)
assert result[1] == (0, 5)
def test_2_horiz_vertices_right_offset():
vertices = [(1, 2), (5, 2)]
result = list(offset_vertices_2d(vertices, -1))
assert result[0] == (1, 1)
assert result[1] == (5, 1)
