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# Copyright (c) 2021-2024, Manfred Moitzi
# License: MIT License
from __future__ import annotations
import pytest
from ezdxf.math import Vec2, BoundingBox2d
from ezdxf.math.clipping import (
ConvexClippingPolygon2d,
ClippingRect2d,
Clipping,
)
from ezdxf.render.forms import circle
class TestClipSingleLineAtConvexBoundary:
@pytest.fixture(scope="class", params=["polygon", "rect"])
def clipper(self, request):
if request.param == "polygon":
return ConvexClippingPolygon2d(Vec2.list([(0, 0), (2, 0), (2, 2), (0, 2)]))
else:
return ClippingRect2d(Vec2(0, 0), Vec2(2, 2))
def test_no_clipping(self, clipper):
assert len(clipper.clip_line(Vec2(-1, 3), Vec2(3, 3))) == 0 # above
assert len(clipper.clip_line(Vec2(-1, -1), Vec2(3, -1))) == 0 # below
assert len(clipper.clip_line(Vec2(-1, 0), Vec2(-1, 2))) == 0 # left
assert len(clipper.clip_line(Vec2(3, 0), Vec2(3, 2))) == 0 # right
def test_regular_clip_inside_outside(self, clipper: Clipping):
s, e = clipper.clip_line(Vec2(1, 1), Vec2(3, 1))[0]
assert s.isclose((1, 1))
assert e.isclose((2, 1))
def test_regular_clip_outside_inside(self, clipper: Clipping):
s, e = clipper.clip_line(Vec2(3, 1), Vec2(1, 1))[0]
assert s.isclose((2, 1))
assert e.isclose((1, 1))
def test_crossing_horizontal_left_to_right(self, clipper: Clipping):
s, e = clipper.clip_line(Vec2(-1, 1), Vec2(3, 1))[0]
assert s.isclose((0, 1))
assert e.isclose((2, 1))
def test_crossing_horizontal_right_to_left(self, clipper: Clipping):
s, e = clipper.clip_line(Vec2(3, 1), Vec2(-1, 1))[0]
assert s.isclose((2, 1))
assert e.isclose((0, 1))
def test_crossing_vertical(self, clipper: Clipping):
s, e = clipper.clip_line(Vec2(1, -1), Vec2(1, 3))[0]
assert s.isclose((1, 0))
assert e.isclose((1, 2))
def test_crossing_diagonal(self, clipper: Clipping):
s, e = clipper.clip_line(Vec2(-1, 0), Vec2(2, 3))[0]
assert s.isclose((0, 1))
assert e.isclose((1, 2))
def test_crossing_diagonal_edge_to_edge(self, clipper: Clipping):
s, e = clipper.clip_line(Vec2(0, 0), Vec2(2, 2))[0]
assert s.isclose((0, 0))
assert e.isclose((2, 2))
@pytest.mark.parametrize("y", [0, 2], ids=["bottom", "top"])
def test_colinear_horizontal_edge(self, clipper: Clipping, y: int):
s, e = clipper.clip_line(Vec2(-1, y), Vec2(3, y))[0]
assert s.isclose((0, y))
assert e.isclose((2, y))
@pytest.mark.parametrize("x", [0, 2], ids=["left", "right"])
def test_colinear_vertical_edge(self, clipper: Clipping, x: int):
s, e = clipper.clip_line(Vec2(x, -1), Vec2(x, 3))[0]
assert s.isclose((x, 0))
assert e.isclose((x, 2))
class TestClipPolylineAtConvexBoundary:
@pytest.fixture(scope="class", params=["polygon", "rect"])
def clipper(self, request):
if request.param == "polygon":
return ConvexClippingPolygon2d(Vec2.list([(0, 0), (8, 0), (8, 2), (0, 2)]))
else:
return ClippingRect2d(Vec2(0, 0), Vec2(8, 2))
def test_crossing_zigzag(self, clipper: Clipping):
p0, p1 = clipper.clip_polyline(Vec2.list([(0, -1), (4, 3), (8, -1)]))
assert p0[0].isclose((1, 0))
assert p0[1].isclose((3, 2))
assert p1[0].isclose((5, 2))
assert p1[1].isclose((7, 0))
def test_closed_rectangle(self):
# 9 ...+--f...
# 8 .d-x==x-c.
# 7 .|.|..|.|.
# 6 .|.|..|.|.
# 5 .|.|..|.|.
# 4 .|.|..|.|.
# 3 .|.|..|.|.
# 2 .|.|..|.|.
# 1 .a-x==x-b.
# 0 ...e--+...
# 0123456789
# a b c d a
rect = Vec2.list([(1, 1), (8, 1), (8, 8), (1, 8), (1, 1)])
# e f
clipper = ClippingRect2d(Vec2(3, 0), Vec2(6, 9))
result = clipper.clip_polyline(rect)
assert len(result) == 2
bbox = BoundingBox2d(result[0])
assert bbox.extmin.isclose((3, 1))
assert bbox.extmax.isclose((6, 1))
bbox = BoundingBox2d(result[1])
assert bbox.extmin.isclose((3, 8))
assert bbox.extmax.isclose((6, 8))
class TestClipPolygonAtConvexBoundary:
@pytest.fixture(scope="class", params=["polygon", "rect"])
def clipper(self, request):
if request.param == "polygon":
return ConvexClippingPolygon2d(
Vec2.list([(-1, -1), (1, -1), (1, 1), (-1, 1)])
)
else:
return ClippingRect2d(Vec2(-1, -1), Vec2(1, 1))
@pytest.fixture
def rect(self):
return Vec2.list([(-1, -1), (1, -1), (1, 1), (-1, 1)])
@pytest.fixture
def overlapping(self): # overlapping
return Vec2.list([(0, 0), (2, 0), (2, 2), (0, 2)])
@pytest.fixture
def inside(self): # complete inside
return Vec2.list([(0, 0), (0.5, 0), (0.5, 0.5), (0, 0.5)])
@pytest.fixture
def outside(self): # complete outside
return Vec2.list([(1, 1), (2, 1), (2, 2), (1, 2)])
def test_subject_do_overlap_clipping_rect(
self, clipper: Clipping, overlapping: list[Vec2]
):
result = clipper.clip_polygon(overlapping)[0]
assert len(result) == 4
assert Vec2(0, 0) in result
assert Vec2(1, 0) in result
assert Vec2(1, 1) in result
assert Vec2(0, 1) in result
def test_subject_is_inside_rect(self, clipper: Clipping, inside: list[Vec2]):
result = clipper.clip_polygon(inside)[0]
assert len(result) == 4
for v in inside:
assert any(r.isclose(v) for r in result) is True
def test_clockwise_oriented_clipping_rect(
self, rect: list[Vec2], inside: list[Vec2]
):
rect.reverse()
clipper = ConvexClippingPolygon2d(rect)
result = clipper.clip_polygon(inside)[0]
assert len(result) == 4
for v in inside:
assert any(r.isclose(v) for r in result) is True
def test_subject_is_outside_rect(self, clipper: Clipping, outside: list[Vec2]):
result = clipper.clip_polygon(outside)[0]
assert len(result) == 0
def test_circle_outside_rect(self, clipper: Clipping, rect: list[Vec2]):
c = Vec2.list(circle(16, 3))
result = clipper.clip_polygon(c)[0]
assert len(result) == 4
for v in rect:
assert any(r.isclose(v) for r in result) is True
def test_circle_inside_rect(self, clipper: Clipping):
c = Vec2.list(circle(16, 0.7))
result = clipper.clip_polygon(c)[0]
assert len(result) == 16
for v in c:
assert any(r.isclose(v) for r in result) is True
def test_rect_outside_circle(self, rect: list[Vec2]):
c = Vec2.list(circle(16, 0.7))
clipper = ConvexClippingPolygon2d(c)
result = clipper.clip_polygon(rect)[0]
assert len(result) == 16
for v in c:
assert any(r.isclose(v) for r in result) is True
def test_rect_inside_circle(self, rect: list[Vec2]):
c = Vec2.list(circle(16, 3))
clipper = ConvexClippingPolygon2d(c)
result = clipper.clip_polygon(rect)[0]
assert len(result) == 4
for v in rect:
assert any(r.isclose(v) for r in result) is True
def test_imprecisions_in_edge_intersection():
clipper = ConvexClippingPolygon2d(
[
Vec2(8.000000000000455, 9.000000000000165),
Vec2(15.000000000000887, 9.000000000000165),
Vec2(15.000000000000887, 11.000000000000834),
Vec2(8.000000000000455, 11.000000000000834),
]
)
polygon = [
Vec2(8.000000000000435, 9.000000000000169),
Vec2(15.000000000000874, 9.000000000000169),
Vec2(15.000000000000895, 11.00000000000084),
Vec2(8.000000000000464, 11.00000000000084),
Vec2(8.000000000000435, 9.000000000000377),
Vec2(8.000000000000435, 9.000000000000169),
]
result = clipper.clip_polygon(polygon)
assert len(result) > 0
if __name__ == "__main__":
pytest.main([__file__])
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