def test_intersect_polygon_segments_zero_tolerance():
"""Tests that the default tolerance of 0 does not update nearby polygons."""
pts0 = (Point2D(1, 0), Point2D(4, 0), Point2D(4, 1.99), Point2D(1, 1.99))
polygon0 = Polygon2D(pts0)
pts1 = (Point2D(0, 2), Point2D(3, 2), Point2D(3, 4), Point2D(0, 4))
polygon1 = Polygon2D(pts1)
polygon2, polygon3 = Polygon2D._intersect_polygon_segments(
polygon0, polygon1)
assert len(polygon2.segments) == 4 # No new points
assert all([
polygon0.vertices[i] == polygon2.vertices[i]
for i in range(len(polygon0.vertices))
])
assert len(polygon3.segments) == 4 # No new points
assert all([
polygon1.vertices[i] == polygon3.vertices[i]
for i in range(len(polygon1.vertices))
])
def test_intersect_polygon_segments_with_colinear_edges():
"""Tests that the default tolerance of 0 updates polygons which share part of an edge segment."""
pts0 = (Point2D(1, 0), Point2D(4, 0), Point2D(4, 2), Point2D(1, 2))
polygon0 = Polygon2D(pts0)
pts1 = (Point2D(0, 2), Point2D(3, 2), Point2D(3, 4), Point2D(0, 4))
polygon1 = Polygon2D(pts1)
polygon0, polygon1 = Polygon2D._intersect_polygon_segments(
polygon0, polygon1)
# Extra vertex added to polygon0, as expected
assert len(polygon0.segments) == 5
assert polygon0.vertices[3] == Point2D(3, 2)
assert polygon0.segments[2].p2 == Point2D(3, 2)
assert polygon0.segments[3].p1 == Point2D(3, 2)
# Extra vertex added to polygon1, as expected
assert len(polygon1.segments) == 5
assert polygon1.vertices[1] == Point2D(1, 2)
assert polygon1.segments[0].p2 == Point2D(1, 2)
assert polygon1.segments[1].p1 == Point2D(1, 2)
def test_intersect_polygon_segments():
"""Tests that polygons within tolerance distance have vertices updated."""
tolerance = 0.01
pts0 = (Point2D(1, 0), Point2D(4, 0), Point2D(4, 1.99), Point2D(1, 1.99))
polygon0 = Polygon2D(pts0)
pts1 = (Point2D(0, 2), Point2D(3, 2), Point2D(3, 4), Point2D(0, 4))
polygon1 = Polygon2D(pts1)
polygon0, polygon1 = Polygon2D._intersect_polygon_segments(
polygon0, polygon1, tolerance)
# Extra vertex added to polygon0, as expected
assert len(polygon0.segments) == 5
assert polygon0.vertices[3] == Point2D(3, 1.99)
assert polygon0.segments[2].p2 == Point2D(3, 1.99)
assert polygon0.segments[3].p1 == Point2D(3, 1.99)
# Extra vertex added to polygon1, as expected
assert len(polygon1.segments) == 5
assert polygon1.vertices[1] == Point2D(1, 2)
assert polygon1.segments[0].p2 == Point2D(1, 2)
assert polygon1.segments[1].p1 == Point2D(1, 2)
