public class Scratchpad {

    @Test
    void noU() {
        Assertions.assertTrue(equalVector(new Vector(-0.5, -0.5, -0.5), getCenter(new Vector(-1, -1, -1))));
        Assertions.assertTrue(equalVector(new Vector(10.5, 10.5, 10.5), getCenter(new Vector(10, 10, 10))));
    }

    @Test
    void yesMe() {
        Assertions.assertTrue(equalVector(new Vector(-0.5, -0.5, -0.5), getBlockCenter(new Vector(-1, -1, -1))));
        Assertions.assertTrue(equalVector(new Vector(10.5, 10.5, 10.5), getBlockCenter(new Vector(10, 10, 10))));
    }

    public Vector getBlockCenter(Vector loc) {
        final Vector vec = new Vector(0.5, 0.5, 0.5);
        return loc.toBlockVector().add(vec);
    }

    boolean equalVector(Vector a, Vector b) {
        assert a.getX() == b.getX();
        assert a.getY() == b.getY();
        assert a.getZ() == b.getZ();
        return true;
    }


    public Vector getCenter(Vector loc) {
        double x = loc.getX();
        double y = loc.getY();
        double z = loc.getZ();
        if (x < 0 && z >= 0) {
            x = x + 0.5D;
            z = z + 0.5D;
        } else if (x >= 0 && z < 0) {
            x = x - 0.5D;
            z = z - 0.5D;
        } else {
            if (x < 0) {
                x = x - 0.5D;
            } else {
                x = x + 0.5D;
            }
            if (z < 0) {
                z = z - 0.5D;
            } else {
                z = z + 0.5D;
            }
        }
        return new Vector(x, y, z);
    }
}