Examples of org.jfree.chart.renderer.xy.XYStepRenderer

org.jfree.chart.renderer.xy.XYStepRenderer
Line/Step item renderer for an {@link XYPlot}. This class draws lines between data points, only allowing horizontal or vertical lines (steps). The example shown here is generated by the XYStepRendererDemo1.java program included in the JFreeChart demo collection:


    /**
     * Two objects that are equal are required to return the same hashCode. 
     */
    public void testHashcode() {
        XYStepRenderer r1 = new XYStepRenderer();
        XYStepRenderer r2 = new XYStepRenderer();
        assertTrue(r1.equals(r2));
        int h1 = r1.hashCode();
        int h2 = r2.hashCode();
        assertEquals(h1, h2);
    }

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    /**
     * Confirm that cloning works.
     */
    public void testCloning() {
        XYStepRenderer r1 = new XYStepRenderer();
        XYStepRenderer r2 = null;
        try {
            r2 = (XYStepRenderer) r1.clone();
        }
        catch (CloneNotSupportedException e) {
            System.err.println("Failed to clone.");
        }
        assertTrue(r1 != r2);
        assertTrue(r1.getClass() == r2.getClass());
        assertTrue(r1.equals(r2));
    }

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    /**
     * Serialize an instance, restore it, and check for equality.
     */
    public void testSerialization() {


        XYStepRenderer r1 = new XYStepRenderer();
        XYStepRenderer r2 = null;


        try {
            ByteArrayOutputStream buffer = new ByteArrayOutputStream();
            ObjectOutput out = new ObjectOutputStream(buffer);
            out.writeObject(r1);

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            s2.add(15.0, 9.5);
            s2.add(20.0, 3.5);
            dataset.addSeries(s2);
            XYPlot plot = new XYPlot(dataset, 
                    new NumberAxis("X"), new NumberAxis("Y"), 
                    new XYStepRenderer());
            JFreeChart chart = new JFreeChart(plot);
            /* BufferedImage image = */ chart.createBufferedImage(300, 200, 
                    null);
            success = true;
        }

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        XYURLGenerator urlGenerator = null;
        if (urls) {
            urlGenerator = new StandardXYURLGenerator();
        }
        XYItemRenderer renderer 
            = new XYStepRenderer(toolTipGenerator, urlGenerator);


        XYPlot plot = new XYPlot(dataset, xAxis, yAxis, null);
        plot.setRenderer(renderer);
        plot.setOrientation(orientation);
        plot.setDomainCrosshairVisible(false);

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