def test_quadratic_to_cubic_bezier():
r = random.Random(0)
def random_vec() -> Vec3:
return Vec3(r.uniform(-10, 10), r.uniform(-10, 10), r.uniform(-10, 10))
for i in range(1000):
quadratic = Bezier3P((random_vec(), random_vec(), random_vec()))
quadratic_approx = list(quadratic.approximate(10))
cubic = quadratic_to_cubic_bezier(quadratic)
cubic_approx = list(cubic.approximate(10))
assert len(quadratic_approx) == len(cubic_approx)
for p1, p2 in zip(quadratic_approx, cubic_approx):
assert p1.isclose(p2)
def test_curve3_to(self):
bez3 = Bezier3P([(0, 0), (2, 1), (4, 0)])
p = path.Path()
p.curve3_to(bez3.control_points[2], bez3.control_points[1])
qpath = path.to_qpainter_path([p])
# Qt converts quadratic bezier curves unto cubic bezier curves
assert qpath.elementCount() == 4
bez4 = quadratic_to_cubic_bezier(bez3)
q1 = qpath.elementAt(1)
assert q1.isCurveTo() # start of cure
assert q1.x, q1.y == bez4.control_points[1]
q2 = qpath.elementAt(2)
assert q2.type == 3 # curve data element
assert q2.x, q2.y == bez4.control_points[2]
q3 = qpath.elementAt(3)
assert q3.type == 3 # curve data element
assert q3.x, q3.y == bez4.control_points[2]