plot1.setShadowXOffset(4.4);
        assertFalse(plot1.equals(plot2));
        plot2.setShadowXOffset(4.4);
        assertTrue(plot1.equals(plot2));

        // shadowYOffset
        plot1.setShadowYOffset(4.4);
        assertFalse(plot1.equals(plot2));
        plot2.setShadowYOffset(4.4);
        assertTrue(plot1.equals(plot2));

        // labelFont
        plot1.setLabelFont(new Font("Serif", Font.PLAIN, 18));
        assertFalse(plot1.equals(plot2));
        plot2.setLabelFont(new Font("Serif", Font.PLAIN, 18));
        assertTrue(plot1.equals(plot2));
       
        // labelPaint
        plot1.setLabelPaint(new GradientPaint(1.0f, 2.0f, Color.darkGray, 
                3.0f, 4.0f, Color.white));
        assertFalse(plot1.equals(plot2));
        plot2.setLabelPaint(new GradientPaint(1.0f, 2.0f, Color.darkGray, 
                3.0f, 4.0f, Color.white));
        assertTrue(plot1.equals(plot2));
       
        // labelBackgroundPaint
        plot1.setLabelBackgroundPaint(new GradientPaint(1.0f, 2.0f, Color.red, 
                3.0f, 4.0f, Color.white));
        assertFalse(plot1.equals(plot2));
        plot2.setLabelBackgroundPaint(new GradientPaint(1.0f, 2.0f, Color.red, 
                3.0f, 4.0f, Color.white));
        assertTrue(plot1.equals(plot2));
        
        // labelOutlinePaint
        plot1.setLabelOutlinePaint(new GradientPaint(1.0f, 2.0f, Color.blue, 
                3.0f, 4.0f, Color.white));
        assertFalse(plot1.equals(plot2));
        plot2.setLabelOutlinePaint(new GradientPaint(1.0f, 2.0f, Color.blue, 
                3.0f, 4.0f, Color.white));
        assertTrue(plot1.equals(plot2));
        
        // labelOutlineStroke
        Stroke s = new BasicStroke(1.1f);
        plot1.setLabelOutlineStroke(s);
        assertFalse(plot1.equals(plot2));
        plot2.setLabelOutlineStroke(s);
        assertTrue(plot1.equals(plot2));
        
        // labelShadowPaint
        plot1.setLabelShadowPaint(new GradientPaint(1.0f, 2.0f, Color.yellow, 
                3.0f, 4.0f, Color.white));
        assertFalse(plot1.equals(plot2));
        plot2.setLabelShadowPaint(new GradientPaint(1.0f, 2.0f, Color.yellow, 
                3.0f, 4.0f, Color.white));
        assertTrue(plot1.equals(plot2));
        
        // explodePercentages
        plot1.setExplodePercent(3, 0.33);
        assertFalse(plot1.equals(plot2));
        plot2.setExplodePercent(3, 0.33);
        assertTrue(plot1.equals(plot2));
        
        // labelGenerator
        plot1.setLabelGenerator(new StandardPieSectionLabelGenerator("{2}{1}{0}"));
        assertFalse(plot1.equals(plot2));
        plot2.setLabelGenerator(new StandardPieSectionLabelGenerator("{2}{1}{0}"));
        assertTrue(plot1.equals(plot2));
       
        // labelFont
        Font f = new Font("SansSerif", Font.PLAIN, 20);
        plot1.setLabelFont(f);
        assertFalse(plot1.equals(plot2));
        plot2.setLabelFont(f);
        assertTrue(plot1.equals(plot2));
        
        // labelPaint
        plot1.setLabelPaint(new GradientPaint(1.0f, 2.0f, Color.magenta, 
                3.0f, 4.0f, Color.white));
        assertFalse(plot1.equals(plot2));
        plot2.setLabelPaint(new GradientPaint(1.0f, 2.0f, Color.magenta, 
                3.0f, 4.0f, Color.white));
        assertTrue(plot1.equals(plot2));
        
        // maximumLabelWidth
        plot1.setMaximumLabelWidth(0.33);
        assertFalse(plot1.equals(plot2));
        plot2.setMaximumLabelWidth(0.33);
        assertTrue(plot1.equals(plot2));
        
        // labelGap
        plot1.setLabelGap(0.11);
        assertFalse(plot1.equals(plot2));
        plot2.setLabelGap(0.11);
        assertTrue(plot1.equals(plot2));
        
        // links visible
        plot1.setLabelLinksVisible(false);
        assertFalse(plot1.equals(plot2));
        plot2.setLabelLinksVisible(false);
        assertTrue(plot1.equals(plot2));
        
        // linkMargin
        plot1.setLabelLinkMargin(0.11);
        assertFalse(plot1.equals(plot2));
        plot2.setLabelLinkMargin(0.11);
        assertTrue(plot1.equals(plot2));

        // labelLinkPaint
        plot1.setLabelLinkPaint(new GradientPaint(1.0f, 2.0f, Color.magenta, 
                3.0f, 4.0f, Color.white));
        assertFalse(plot1.equals(plot2));
        plot2.setLabelLinkPaint(new GradientPaint(1.0f, 2.0f, Color.magenta, 
                3.0f, 4.0f, Color.white));
        assertTrue(plot1.equals(plot2));
       
        // labelLinkStroke
        plot1.setLabelLinkStroke(new BasicStroke(1.0f));
        assertFalse(plot1.equals(plot2));
        plot2.setLabelLinkStroke(new BasicStroke(1.0f));
        assertTrue(plot1.equals(plot2));
       
        // toolTipGenerator
        plot1.setToolTipGenerator(
            new StandardPieToolTipGenerator("{2}{1}{0}")
        );
        assertFalse(plot1.equals(plot2));
        plot2.setToolTipGenerator(
            new StandardPieToolTipGenerator("{2}{1}{0}")
        );
        assertTrue(plot1.equals(plot2));
        
        // urlGenerator
        plot1.setURLGenerator(new StandardPieURLGenerator("xx"));
        assertFalse(plot1.equals(plot2));
        plot2.setURLGenerator(new StandardPieURLGenerator("xx"));
        assertTrue(plot1.equals(plot2));
        
        // minimumArcAngleToDraw
        plot1.setMinimumArcAngleToDraw(1.0);
        assertFalse(plot1.equals(plot2));
        plot2.setMinimumArcAngleToDraw(1.0);  
        assertTrue(plot1.equals(plot2));
        
        // legendItemShape
        plot1.setLegendItemShape(new Rectangle2D.Double(1.0, 2.0, 3.0, 4.0));
        assertFalse(plot1.equals(plot2));
        plot2.setLegendItemShape(new Rectangle2D.Double(1.0, 2.0, 3.0, 4.0));
        assertTrue(plot1.equals(plot2));
        
    }

    /**
     * Some basic checks for the clone() method.
     */
    public void testCloning() {
        PiePlot p1 = new PiePlot();
        PiePlot p2 = null;
        try {
            p2 = (PiePlot) p1.clone();
        }
        catch (CloneNotSupportedException e) {
            e.printStackTrace();
            System.err.println("Failed to clone.");
        }
        assertTrue(p1 != p2);
        assertTrue(p1.getClass() == p2.getClass());
        assertTrue(p1.equals(p2));
    }

    /**
     * Serialize an instance, restore it, and check for equality.
     */
    public void testSerialization() {
        PiePlot p1 = new PiePlot(null);
        PiePlot p2 = null;
        try {
            ByteArrayOutputStream buffer = new ByteArrayOutputStream();
            ObjectOutput out = new ObjectOutputStream(buffer);
            out.writeObject(p1);
            out.close();

            ObjectInput in = new ObjectInputStream(
                new ByteArrayInputStream(buffer.toByteArray())
            );
            p2 = (PiePlot) in.readObject();
            in.close();
        }
        catch (Exception e) {
            e.printStackTrace();
        }
        assertEquals(p1, p2);
    }

    /**
     * Some checks for the getLegendItems() method.
     */
    public void testGetLegendItems() {
        DefaultPieDataset dataset = new DefaultPieDataset();
        dataset.setValue("Item 1", 1.0);
        dataset.setValue("Item 2", 2.0);
        dataset.setValue("Item 3", 0.0);
        dataset.setValue("Item 4", null);
       
        PiePlot plot = new PiePlot(dataset);
        plot.setIgnoreNullValues(false);
        plot.setIgnoreZeroValues(false);
        LegendItemCollection items = plot.getLegendItems();
        assertEquals(4, items.getItemCount());
        
        // check that null items are ignored if requested
        plot.setIgnoreNullValues(true);
        items = plot.getLegendItems();
        assertEquals(3, items.getItemCount());
        
        // check that zero items are ignored if requested
        plot.setIgnoreZeroValues(true);
        items = plot.getLegendItems();
        assertEquals(2, items.getItemCount());
        
        // check that negative items are always ignored
        dataset.setValue("Item 5", -1.0);
        items = plot.getLegendItems();
        assertEquals(2, items.getItemCount());        
    }
    
}