// check independence
p1.addAnnotation(new CategoryLineAnnotation("C1", 1.0, "C2", 2.0,
Color.red, new BasicStroke(1.0f)));
assertFalse(p1.equals(p2));
p2.addAnnotation(new CategoryLineAnnotation("C1", 1.0, "C2", 2.0,
Color.red, new BasicStroke(1.0f)));
assertTrue(p1.equals(p2));
p1.addDomainMarker(new CategoryMarker("C1"), Layer.FOREGROUND);
assertFalse(p1.equals(p2));