def test_create_line_seg():
line = Line(Point(0, 0), 3 / 4)
length = 10
seg = line.create_line_segment_of_length(length)
assert seg.length == length
points = (Point(4, 3), Point(-4, -3))
assert seg.p1 in points
assert seg.p2 in points
def test_same_line_is_parallel():
line = Line(Point(0, 0), 1)
l2 = Line(Point(1, 100), 0)
l3 = Line(Point(2, -23), math.inf)
assert line.is_parallel_to(line)
assert l2.is_parallel_to(l2)
assert l3.is_parallel_to(l3)
def test_create_line_seg_vert_horr():
line = Line(Point(0, 0), 0)
length = 10
seg = line.create_line_segment_of_length(length)
assert seg.length == length
points = (Point(5, 0), Point(-5, 0))
assert seg.p1 in points
assert seg.p2 in points
line.slope = math.inf
length = 10
seg = line.create_line_segment_of_length(length)
assert seg.length == length
points = (Point(0, 5), Point(0, -5))
assert seg.p1 in points
assert seg.p2 in points
def test_make_perpendicular():
line = Line(Point(0, 0), 0)
perp_point = Point(0, 10)
perp = line.create_line_perpendicular(perp_point)
assert perp.slope == math.inf
assert perp.p == perp_point
line.slope = math.inf
perp_point = Point(10, 0)
perp = line.create_line_perpendicular(perp_point)
assert perp.slope == 0
assert perp.p == perp_point
line.slope = 1
perp_point = Point(-10, 10)
perp = line.create_line_perpendicular(perp_point)
assert perp.slope == -1
assert perp.p == perp_point
def test_creation():
assert Line(Point(0, 0), 1)
assert Line(Point(0, 0), 0)
assert Line(Point(0, 0), -1)
assert Line(Point(0, 0), math.inf)
def test_parallel_creation_has_same_slope():
slope = 100
line = Line(Point(0, 0), slope)
assert line.create_parallel_line(Point(100, 9)).slope == slope
def test_no_intersection():
line = Line(Point(0, 0), 1)
assert line.intersection_point(Line(Point(1, 100), 1)) is None
# Not sure about the behavior of the following case...
assert line.intersection_point(line) is None
def test_simple_intersection():
assert Line(Point(0, 0), 1).intersection_point(Line(Point(0, 0),
2)) == Point(0, 0)
def test_parallel_lines_are_parallel():
line = Line(Point(0, 0), 1)
l2 = Line(Point(1, 100), 1)
assert line.is_parallel_to(l2)
line.slope = math.inf
l2.slope = math.inf
assert line.is_parallel_to(l2)
line.slope = 0
l2.slope = 0
assert line.is_parallel_to(l2)
def test_cant_make_perpendicular_if_co_linear():
line = Line(Point(0, 0), 0)
assert line.create_line_perpendicular(Point(10, 0)) is None
def test_not_parallel_simple():
assert Line(Point(0, 0), 1).is_parallel_to(Line(Point(0, 0), 2)) is False
def test_point_is_not_on():
assert not Line(Point(0, 0), 1).point_is_on(Point(1, 2))
assert not Line(Point(3, 100), 0).point_is_on(Point(0, 0))
assert not Line(Point(1, 30), math.inf).point_is_on(Point(2, 0))
def test_simple_y_intercept():
assert Line(Point(0, 0), 1).y_intercept is 0
def test_point_is_on_true():
assert Line(Point(0, 0), 1).point_is_on(Point(1, 1))
assert Line(Point(3, 100), 0).point_is_on(Point(0, 100))
assert Line(Point(1, 30), math.inf).point_is_on(Point(1, 300))
def test_point_is_on_same_as_point_created():
assert Line(Point(0, 0), 1).point_is_on(Point(0, 0))
assert Line(Point(3, 100), 0).point_is_on(Point(3, 100))
assert Line(Point(1, 30), math.inf).point_is_on(Point(1, 30))
def test_y_intercept_horizontal():
assert Line(Point(1, 0), 0).y_intercept == 0
assert Line(Point(0, 10), 0).y_intercept == 10
def test_y_intercept_vertical():
assert Line(Point(1, 0), math.inf).y_intercept is None
assert Line(Point(0, 0), math.inf).y_intercept == math.inf
def test_y_intercept():
assert Line(Point(2, 2), 1).y_intercept is 0
assert Line(Point(2, 1), 1).y_intercept is -1
