Java tutorial
package org.jfree.chart.demo; import java.awt.Color; import java.awt.Dimension; import javax.swing.JPanel; import org.jfree.chart.ChartPanel; import org.jfree.chart.JFreeChart; import org.jfree.chart.axis.DateAxis; import org.jfree.chart.axis.NumberAxis; import org.jfree.chart.axis.SymbolAxis; import org.jfree.chart.plot.PiePlot; import org.jfree.chart.plot.PlotOrientation; import org.jfree.chart.plot.XYPlot; import org.jfree.chart.renderer.LookupPaintScale; import org.jfree.chart.renderer.xy.XYBlockRenderer; import org.jfree.chart.title.PaintScaleLegend; import org.jfree.data.time.Day; import org.jfree.data.time.RegularTimePeriod; import org.jfree.data.xy.DefaultXYZDataset; import org.jfree.data.xy.XYZDataset; import org.jfree.ui.ApplicationFrame; import org.jfree.ui.RectangleAnchor; import org.jfree.ui.RectangleEdge; import org.jfree.ui.RectangleInsets; import org.jfree.ui.RefineryUtilities; public class XYBlockChartDemo2 extends ApplicationFrame { private static final long serialVersionUID = 1L; public XYBlockChartDemo2(String s) { super(s); JPanel jpanel = createDemoPanel(); jpanel.setPreferredSize(new Dimension(500, 270)); setContentPane(jpanel); } private static JFreeChart createChart(XYZDataset xyzdataset) { DateAxis dateaxis = new DateAxis("Date"); dateaxis.setLowerMargin(0.0D); dateaxis.setUpperMargin(0.0D); dateaxis.setInverted(true); NumberAxis numberaxis = new NumberAxis("Hour"); numberaxis.setUpperMargin(0.0D); numberaxis.setStandardTickUnits(NumberAxis.createIntegerTickUnits()); XYBlockRenderer xyblockrenderer = new XYBlockRenderer(); xyblockrenderer.setBlockWidth(86400000D); xyblockrenderer.setBlockAnchor(RectangleAnchor.BOTTOM_LEFT); LookupPaintScale lookuppaintscale = new LookupPaintScale(0.5D, 4.5D, Color.white); lookuppaintscale.add(0.5D, Color.red); lookuppaintscale.add(1.5D, Color.green); lookuppaintscale.add(2.5D, Color.blue); lookuppaintscale.add(3.5D, Color.yellow); xyblockrenderer.setPaintScale(lookuppaintscale); XYPlot xyplot = new XYPlot(xyzdataset, dateaxis, numberaxis, xyblockrenderer); xyplot.setOrientation(PlotOrientation.HORIZONTAL); xyplot.setBackgroundPaint(Color.lightGray); xyplot.setRangeGridlinePaint(Color.white); xyplot.setAxisOffset(new RectangleInsets(5D, 5D, 5D, 5D)); JFreeChart jfreechart = new JFreeChart("XYBlockChartDemo2", xyplot); jfreechart.removeLegend(); jfreechart.setBackgroundPaint(Color.white); SymbolAxis symbolaxis = new SymbolAxis(null, new String[] { "", "Unavailable", "Free", "Group 1", "Group 2" }); symbolaxis.setRange(0.5D, 4.5D); symbolaxis.setPlot(new PiePlot()); symbolaxis.setGridBandsVisible(false); PaintScaleLegend paintscalelegend = new PaintScaleLegend(lookuppaintscale, symbolaxis); paintscalelegend.setMargin(new RectangleInsets(3D, 10D, 3D, 10D)); paintscalelegend.setPosition(RectangleEdge.BOTTOM); paintscalelegend.setAxisOffset(5D); jfreechart.addSubtitle(paintscalelegend); return jfreechart; } private static XYZDataset createDataset() { double ad[] = new double[2400]; double ad1[] = new double[2400]; double ad2[] = new double[2400]; Object obj = new Day(); for (int i = 0; i < 100; i++) { double d = 1.0D; for (int j = 0; j < 24; j++) { if (Math.random() < 0.10000000000000001D) d = Math.random() * 4D; ad[i * 24 + j] = ((RegularTimePeriod) (obj)).getFirstMillisecond(); ad1[i * 24 + j] = j; ad2[i * 24 + j] = d; } obj = ((RegularTimePeriod) (obj)).next(); } DefaultXYZDataset defaultxyzdataset = new DefaultXYZDataset(); defaultxyzdataset.addSeries("Series 1", new double[][] { ad, ad1, ad2 }); return defaultxyzdataset; } public static JPanel createDemoPanel() { return new ChartPanel(createChart(createDataset())); } public static void main(String args[]) { XYBlockChartDemo2 xyblockchartdemo2 = new XYBlockChartDemo2("Block Chart Demo 2"); xyblockchartdemo2.pack(); RefineryUtilities.centerFrameOnScreen(xyblockchartdemo2); xyblockchartdemo2.setVisible(true); } }