def test_multiple_segments(self):
p = Path()
p.curve4_to((4, 0), (1, 2), (3, 2))
p.line_to((6, 0))
p.curve3_to((8, 0), (7, 1))
result = list(to_bsplines_and_vertices(p))
assert len(result) == 3, "expected three segments"
def test_approximate_curves():
path = Path()
path.curve3_to((2, 0), (1, 1))
path.curve4_to((3, 0), (2, 1), (3, 1))
vertices = list(path.approximate(20))
assert len(vertices) == 41
assert vertices[0] == (0, 0)
assert vertices[-1] == (3, 0)
def test_one_path_curve3_to(self):
path = Path()
path.curve3_to((2, 0), (1, 1))
result = transform_paths([path], Matrix44())
path0 = result[0]
assert path0[0].type == Command.CURVE3_TO
assert len(path0[0]) == 2
assert path0.start == (0, 0)
assert path0.end == (2, 0)
def test_one_quadratic_bezier(self):
p = Path()
p.curve3_to((4, 0), (2, 2))
result = list(to_bsplines_and_vertices(p))
assert len(result) == 1, "expected one B-spline"
cpnts = result[0].control_points
# A quadratic bezier should be converted to cubic bezier curve, which
# has a precise cubic B-spline representation.
assert len(cpnts) == 4, "expected 4 control vertices"
assert cpnts[0] == (0, 0)
assert cpnts[3] == (4, 0)
def test_one_path_multiple_command(self):
path = Path()
path.line_to((1, 0))
path.curve3_to((2, 0), (2.5, 1))
path.curve4_to((3, 0), (2, 1), (3, 1))
result = transform_paths([path], Matrix44())
path0 = result[0]
assert path0[0].type == Command.LINE_TO
assert path0[1].type == Command.CURVE3_TO
assert path0[2].type == Command.CURVE4_TO
assert path0.start == (0, 0)
assert path0.end == (3, 0)
def test_two_paths_multiple_commands(self):
path_a = Path()
path_a.line_to((1, 0))
path_a.curve3_to((2, 0), (2.5, 1))
path_a.curve4_to((3, 0), (2, 1), (3, 1))
path_b = path_a.transform(Matrix44.translate(4, 0, 0))
result = transform_paths([path_a, path_b], Matrix44())
path0 = result[0]
assert path0[0].type == Command.LINE_TO
assert path0[1].type == Command.CURVE3_TO
assert path0[2].type == Command.CURVE4_TO
assert path0.start == (0, 0)
assert path0.end == (3, 0)
path1 = result[1]
assert path1[0].type == Command.LINE_TO
assert path1[1].type == Command.CURVE3_TO
assert path1[2].type == Command.CURVE4_TO
assert path1.start == (4, 0)
assert path1.end == (7, 0)
def test_reversing_one_curve3():
p = Path()
p.curve3_to((3, 0), (1.5, 1))
p2 = list(p.reversed().control_vertices())
assert p2 == [(3, 0), (1.5, 1), (0, 0)]
def p1():
path = Path()
path.line_to((2, 0))
path.curve4_to((4, 0), (2, 1), (4, 1)) # end, ctrl1, ctrl2
path.curve3_to((6, 0), (5, -1)) # end, ctrl
return path
def test_curve3_to():
path = Path()
path.curve3_to((10, 0), (5, 5))
assert path[0] == ((10, 0), (5, 5))
assert path.end == (10, 0)
def quadratic(self):
p = Path()
p.curve3_to((2, 0), (1, 1))
return p
