def test_arcball_1(self):
ball = t.Arcball()
ball = t.Arcball(initial=np.identity(4))
ball.place([320, 320], 320)
ball.down([500, 250])
ball.drag([475, 275])
R = ball.matrix()
assert_allclose(np.sum(R), 3.90583455, atol=_ATOL)
def test_arcball_2(self):
ball = t.Arcball(initial=[1, 0, 0, 0])
ball.place([320, 320], 320)
ball.setaxes([1, 1, 0], [-1, 1, 0])
ball.setconstrain(True)
ball.down([400, 200])
ball.drag([200, 400])
R = ball.matrix()
assert_allclose(np.sum(R), 0.2055924)