Java tutorial
package org.jfree.chart.demo; import java.awt.Dimension; import javax.swing.JPanel; import org.jfree.chart.ChartFactory; import org.jfree.chart.ChartPanel; import org.jfree.chart.JFreeChart; import org.jfree.chart.labels.StandardXYToolTipGenerator; import org.jfree.chart.plot.PlotOrientation; import org.jfree.chart.plot.XYPlot; import org.jfree.chart.renderer.xy.XYStepAreaRenderer; import org.jfree.data.xy.XYDataset; import org.jfree.data.xy.XYSeries; import org.jfree.data.xy.XYSeriesCollection; import org.jfree.ui.ApplicationFrame; import org.jfree.ui.RefineryUtilities; public class XYStepAreaRendererDemo1 extends ApplicationFrame { private static final long serialVersionUID = 1L; public XYStepAreaRendererDemo1(String s) { super(s); JPanel jpanel = createDemoPanel(); jpanel.setPreferredSize(new Dimension(500, 300)); setContentPane(jpanel); } private static JFreeChart createChart(XYDataset xydataset) { JFreeChart jfreechart = ChartFactory.createXYLineChart("XYStepAreaRenderer Demo 1", "X", "Y", xydataset, PlotOrientation.VERTICAL, true, true, false); XYPlot xyplot = (XYPlot) jfreechart.getPlot(); XYStepAreaRenderer xysteparearenderer = new XYStepAreaRenderer(2); xysteparearenderer.setBaseToolTipGenerator(new StandardXYToolTipGenerator()); xysteparearenderer.setDefaultEntityRadius(6); xyplot.setRenderer(xysteparearenderer); return jfreechart; } private static XYDataset createDataset() { XYSeries xyseries = new XYSeries("Series 1"); xyseries.add(1.0D, 3D); xyseries.add(2D, 4D); xyseries.add(3D, 2D); xyseries.add(6D, 3D); XYSeries xyseries1 = new XYSeries("Series 2"); xyseries1.add(1.0D, 7D); xyseries1.add(2D, 6D); xyseries1.add(3D, 9D); xyseries1.add(4D, 5D); xyseries1.add(6D, 4D); XYSeriesCollection xyseriescollection = new XYSeriesCollection(); xyseriescollection.addSeries(xyseries); xyseriescollection.addSeries(xyseries1); return xyseriescollection; } public static JPanel createDemoPanel() { JFreeChart jfreechart = createChart(createDataset()); return new ChartPanel(jfreechart); } public static void main(String args[]) { XYStepAreaRendererDemo1 xysteparearendererdemo1 = new XYStepAreaRendererDemo1("XYStepAreaRenderer Demo 1"); xysteparearendererdemo1.pack(); RefineryUtilities.centerFrameOnScreen(xysteparearendererdemo1); xysteparearendererdemo1.setVisible(true); } }