plot1.setDrawingSupplier(new DefaultDrawingSupplier(
                new Paint[] {Color.blue}, new Paint[] {Color.red}, 
                new Stroke[] {new BasicStroke(1.1f)}, 
                new Stroke[] {new BasicStroke(9.9f)}, 
                new Shape[] {new Rectangle(1, 2, 3, 4)}));
        assertFalse(plot1.equals(plot2));