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import pytest
from sdl2.ext import algorithms as alg
def test_cohensutherland():
# Test a simple diagonal intersection
ret = alg.cohensutherland(1, 2, 2, 1, 0, 0, 4, 4)
assert ret == (1, 1, 2, 2)
# Test handling of swapped top/bottom values
ret = alg.cohensutherland(1, 1, 2, 2, 0, 0, 4, 4)
assert ret == (1, 1, 2, 2)
# Test partial intersection
ret = alg.cohensutherland(1, 1, 2, 2, 1.5, 0, 1.5, 1.5)
assert ret == (1.5, 1, 1.5, 1.5)
# Test non-intersecting line
ret = alg.cohensutherland(1, 2, 2, 1, 0, 0, 0, 4)
assert ret == (None, None, None, None)
def test_liangbarsky():
# Test a simple diagonal intersection
ret = alg.liangbarsky(1, 2, 2, 1, 0, 0, 4, 4)
assert ret == (1, 1, 2, 2)
# Test handling of swapped top/bottom values
ret = alg.liangbarsky(1, 1, 2, 2, 0, 0, 4, 4)
assert ret == (1, 1, 2, 2)
# Test partial intersection
ret = alg.liangbarsky(1, 1, 2, 2, 1.5, 0, 1.5, 1.5)
assert ret == (1.5, 1, 1.5, 1.5)
# Test non-intersecting line
ret = alg.liangbarsky(1, 2, 2, 1, 0, 0, 0, 4)
assert ret == (None, None, None, None)
def test_clipline():
# Test a simple diagonal intersection w/ default method
ret = alg.clipline(1, 2, 2, 1, 0, 0, 4, 4)
assert ret == (1, 1, 2, 2)
# Test a simple diagonal intersection w/ Liang-Barsky
ret = alg.clipline(1, 2, 2, 1, 0, 0, 4, 4, method='liangbarsky')
assert ret == (1, 1, 2, 2)
# Test a simple diagonal intersection w/ Cohen-Sutherland
ret = alg.clipline(1, 2, 2, 1, 0, 0, 4, 4, method='cohensutherland')
assert ret == (1, 1, 2, 2)
# Test exception with unknown clipping method
with pytest.raises(ValueError):
alg.clipline(1, 2, 2, 1, 0, 0, 4, 4, method='cohenlebowski')
def test_point_on_line():
line = [(1, 1), (3, 3)]
assert alg.point_on_line(line[0], line[1], (2, 2))
assert alg.point_on_line(line[0], line[1], (3, 3))
assert alg.point_on_line(line[1], line[0], (2, 2))
assert not alg.point_on_line(line[0], line[1], (3, 4))
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