a2 = new XYDrawableAnnotation(11.0, 20.0, 100.0, 200.0,
                new TestDrawable());
        assertTrue(a1.equals(a2));

        a1 = new XYDrawableAnnotation(11.0, 22.0, 100.0, 200.0,
                new TestDrawable());
        assertFalse(a1.equals(a2));