jfreechart之旅 Combined Charts

biaoflying

  
Introduction
  JFreeChart supports combined charts via several plot classes that can manage any number of subplots:
• CombinedDomainCategoryPlot / CombinedRangeCategoryPlot;• CombinedDomainXYPlot / CombinedRangeXYPlot;
               
               
               
Combined Domain Category Plot
  A combined domain category plot is a plot that displays two or more subplots (instances of CategoryPlot)
that share a common domain axis. Each subplot maintains its own range axis.
  Refer to 1.bmp
  
Constructing the Chart
  The key step is the creation of a CombinedDomainCategoryPlot instance, to which subplots are added:
  CategoryAxis domainAxis = new CategoryAxis("Category");  CombinedDomainCategoryPlot plot = new
    CombinedDomainCategoryPlot(domainAxis);    plot.add(subplot1, 2);    plot.add(subplot2, 1);  JFreeChart result = new JFreeChart(    "Combined Domain Category Plot Demo",    new Font("SansSerif", Font.BOLD, 12),    plot,    true  );
  Notice how subplot1 has been added with a weight of 2 (the second argument in the add() method, while subplot2 has been added with a weight of 1. This controls the amount of space allocated to each plot.  The subplots are regular CategoryPlot instances that have had their domain axis set to null.
  CategoryDataset dataset1 = createDataset1();  NumberAxis rangeAxis1 = new NumberAxis("Value");  rangeAxis1.setStandardTickUnits(
    NumberAxis.createIntegerTickUnits());  LineAndShapeRenderer renderer1 = new LineAndShapeRenderer();  renderer1.setBaseToolTipGenerator(new   
    StandardCategoryToolTipGenerator());  CategoryPlot subplot1 = new CategoryPlot(dataset1, null,
    rangeAxis1, renderer1);  subplot1.setDomainGridlinesVisible(true);  
  CategoryDataset dataset2 = createDataset2();  NumberAxis rangeAxis2 = new NumberAxis("Value");  rangeAxis2.setStandardTickUnits(
    NumberAxis.createIntegerTickUnits());  BarRenderer renderer2 = new BarRenderer();  renderer2.setBaseToolTipGenerator(new   
    StandardCategoryToolTipGenerator());  CategoryPlot subplot2 = new CategoryPlot(dataset2, null,
    rangeAxis2, renderer2);  subplot2.setDomainGridlinesVisible(true);
Combined Range Category Plot
  A combined range category plot is a plot that displays two or more subplots (instances of CategoryPlot) that share a common range axis. Each subplot maintains its own domain axis.
  Refer to 2.bmp
Constructing the Chart
  The key step is the creation of a CombinedRangeCategoryPlot instance, to which subplots   
are added:
  ValueAxis rangeAxis = new NumberAxis("Value");
  CombinedRangeCategoryPlot plot = new   
    CombinedRangeCategoryPlot(rangeAxis);
    plot.add(subplot1, 3);
    plot.add(subplot2, 2);
  JFreeChart result = new JFreeChart(
    "Combined Range Category Plot Demo",
    new Font("SansSerif", Font.BOLD, 12),
    plot,
    true
  );
  The subplots are regular CategoryPlot instances that have had their range axis set to null.
  CategoryDataset dataset1 = createDataset1();
  CategoryAxis domainAxis1 = new CategoryAxis("Class 1");
  domainAxis1.setCategoryLabelPositions(
    CategoryLabelPositions.UP 45);
  domainAxis1.setMaxCategoryLabelWidthRatio(5.0f);
  LineAndShapeRenderer renderer1 = new LineAndShapeRenderer();
  renderer1.setBaseToolTipGenerator(new   
    StandardCategoryToolTipGenerator());
  CategoryPlot subplot1 = new CategoryPlot(dataset1,   
    domainAxis1, null, renderer1);
  subplot1.setDomainGridlinesVisible(true);
  
  CategoryDataset dataset2 = createDataset2();
  CategoryAxis domainAxis2 = new CategoryAxis("Class 2");
  domainAxis2.setCategoryLabelPositions(
    CategoryLabelPositions.UP 45);
  domainAxis2.setMaxCategoryLabelWidthRatio(5.0f);
  BarRenderer renderer2 = new BarRenderer();
  renderer2.setBaseToolTipGenerator(new   
    StandardCategoryToolTipGenerator());
  CategoryPlot subplot2 = new CategoryPlot(dataset2,   
    domainAxis2, null, renderer2);
  subplot2.setDomainGridlinesVisible(true);
Combined Domain XY Plot
  A combined domain XY plot is a plot that displays two or more subplots (instances of XYPlot) thatshare a common domain axis. Each subplot maintains its own range axis.
  Refer to 3.bmp.
  The key step is the creation of a CombinedDomainXYPlot instance, to which subplots are added:
  CombinedDomainXYPlot plot = new       CombinedDomainXYPlot(new NumberAxis("Domain"));  plot.setGap(10.0);
  plot.add(subplot1, 1);
  plot.add(subplot2, 1);
  plot.setOrientation(PlotOrientation.VERTICAL);
  return new JFreeChart(
    "CombinedDomainXYPlot Demo",
    JFreeChart.DEFAULT TITLE FONT, plot, true
  );
  The subplots are regular XYPlot instances that have had their domain axis set to null.
  XYDataset data1 = createDataset1();  XYItemRenderer renderer1 = new
    StandardXYItemRenderer();  NumberAxis rangeAxis1 = new NumberAxis("Range 1");  XYPlot subplot1 = new XYPlot(data1, null, rangeAxis1,   
    renderer1);  subplot1.setRangeAxisLocation(
    AxisLocation.BOTTOM OR LEFT);  XYTextAnnotation annotation = new   
    XYTextAnnotation("Hello!", 50.0, 10000.0);  annotation.setFont(new Font("SansSerif", Font.PLAIN,
    9));  annotation.setRotationAngle(Math.PI / 4.0);  subplot1.addAnnotation(annotation);
  // create subplot 2...  XYDataset data2 = createDataset2();  XYItemRenderer renderer2 = new
    StandardXYItemRenderer();  NumberAxis rangeAxis2 = new NumberAxis("Range 2");  rangeAxis2.setAutoRangeIncludesZero(false);  XYPlot subplot2 = new XYPlot(data2, null, rangeAxis2,
    renderer2);  subplot2.setRangeAxisLocation(
    AxisLocation.TOP OR LEFT);
Combined Range XY Plot
  A combined range XY plot is a plot that displays two or more subplots (instances of XYPlot) that share a common range axis. Each subplot maintains its own domain axis.
  Refer to 4.bmp
  // create the plot...
  CombinedRangeXYPlot plot = new CombinedRangeXYPlot(new      NumberAxis("Value"));  plot.add(subplot1, 1);  plot.add(subplot2, 1);  return new JFreeChart(  "Combined (Range) XY Plot",  JFreeChart.DEFAULT TITLE FONT, plot, true  );
  
  // create subplot 1...
  IntervalXYDataset data1 = createDataset1();
  XYItemRenderer renderer1 = new XYBarRenderer(0.20);
  renderer1.setToolTipGenerator(
    new StandardXYToolTipGenerator(
      new SimpleDateFormat("d-MMM-yyyy"), new   
        DecimalFormat("0,000.0")
     )
  );
  XYPlot subplot1 = new XYPlot(data1, new   
    DateAxis("Date"), null, renderer1);
  // create subplot 2...
  XYDataset data2 = createDataset2();
  XYItemRenderer renderer2 = new   
    StandardXYItemRenderer();
  renderer2.setToolTipGenerator(
    new StandardXYToolTipGenerator(
      new SimpleDateFormat("d-MMM-yyyy"), new         
        DecimalFormat("0,000.0")
      )
);
  XYPlot subplot2 = new XYPlot(data2, new
    DateAxis("Date"), null, renderer2);

       
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本文来自ChinaUnix博客，如果查看原文请点：http://blog.chinaunix.net/u2/63463/showart_518460.html