Java 使用 JFreechart (bar, XY) 绘制多重图

draw a multiple plot with JFreechart (bar, XY)

提问by trolologuy

Hello i have to make a program to display power curves, and therefore i need to display three different plots on one window. The different kind of plots are XY (just points), bar, and XY with lines.

您好，我必须制作一个程序来显示功率曲线，因此我需要在一个窗口上显示三个不同的图。不同类型的图是 XY（只是点）、条形图和带线的 XY。

My problem(s) :somehow i can get only two of the charts to get drawn AND i can't change the colors of the single chart correctly.

我的问题：不知何故，我只能绘制两个图表，而且我无法正确更改单个图表的颜色。

EDIT : When i put as comment the declaration of the third chart, the second one finally gets drawn. Is it impossible to draw three charts ?

编辑：当我将第三张图表的声明作为评论时，第二张图表终于被绘制出来。是不是不可能画三个图表？

Any help will be greatly appreciated, thanks ;)

任何帮助将不胜感激，谢谢;)

import org.jfree.chart.ChartPanel;
import org.jfree.chart.JFreeChart;
import org.jfree.chart.axis.NumberAxis;
import org.jfree.chart.axis.NumberTickUnit;
import org.jfree.chart.axis.ValueAxis;
import org.jfree.chart.plot.DatasetRenderingOrder;
import org.jfree.chart.plot.XYPlot;
import org.jfree.chart.renderer.xy.XYBarRenderer;
import org.jfree.chart.renderer.xy.XYItemRenderer;
import org.jfree.chart.renderer.xy.XYLineAndShapeRenderer;
import org.jfree.data.xy.IntervalXYDataset;
import org.jfree.data.xy.XYSeries;
import org.jfree.data.xy.XYSeriesCollection;
import org.jfree.ui.ApplicationFrame;


public class OverlaidPlot extends ApplicationFrame 
{
   final XYSeries series0 = new XYSeries("Graph0");
   final XYSeries series1 = new XYSeries("Graph1");
   final XYSeries series2 = new XYSeries("Graph2");

   public OverlaidXYPlotDemo(final String title) 
    {
       super(title);
       final JFreeChart chart = createOverlaidChart();
       final ChartPanel panel = new ChartPanel(chart, true, true, true, true, true);
       panel.setPreferredSize(new java.awt.Dimension(800, 600));
       setContentPane(panel);
     }
 public void addElem0(double x, double y)
{
    this.series0.add(x, y);
}

public void addElem1(double x, double y)
{
    this.series1.add(x, y);
}

public void addElem2(double x, double y)
{
    this.series2.add(x, y);
}


private JFreeChart createOverlaidChart() 
{
    final NumberAxis domainAxis = new NumberAxis("Speed (m/s)");
    final ValueAxis rangeAxis = new NumberAxis("Power (kw)");

    // create plot ...
    final IntervalXYDataset data0 = createDataset0();
    final XYItemRenderer renderer0 = new XYBarRenderer(0.20);
    // change "new XYBarRenderer(0.20)" to "StandardXYItemRenderer()" if you want to change  type of graph
    final XYPlot plot = new XYPlot(data0, domainAxis, rangeAxis, renderer0);

    // add a second dataset and renderer... 
    final IntervalXYDataset data1 = createDataset1();
    final XYLineAndShapeRenderer renderer1 = new XYLineAndShapeRenderer(false, true); 
    // arguments of new XYLineAndShapeRenderer are to activate or deactivate the display of points or line. Set first argument to true if you want to draw lines between the points for e.g.
    plot.setDataset(1, data1);
    plot.setRenderer(1, renderer1);

    // add a third dataset and renderer... 
    final IntervalXYDataset data2 = createDataset2();
    final XYLineAndShapeRenderer renderer2 = new XYLineAndShapeRenderer(true, true); 
    // arguments of new XYLineAndShapeRenderer are to activate or deactivate the display of points or line. Set first argument to true if you want to draw lines between the points for e.g.
    plot.setDataset(1, data2);
    plot.setRenderer(1, renderer2);

    plot.setDatasetRenderingOrder(DatasetRenderingOrder.FORWARD);
    NumberAxis domain = (NumberAxis) plot.getDomainAxis();/*
    domain.setRange(0.00, 30);*/

    domain.setTickUnit(new NumberTickUnit(0.5));     
    domain.setVerticalTickLabels(true);
    // return a new chart containing the overlaid plot...
    return new JFreeChart("Test", JFreeChart.DEFAULT_TITLE_FONT, plot, true);

}

private IntervalXYDataset createDataset0() 
{
    // create dataset 0...
    final XYSeriesCollection coll0 = new XYSeriesCollection(series0);
    return coll0;
}

private IntervalXYDataset createDataset1() 
{
    // create dataset 1...
    final XYSeriesCollection coll1 = new XYSeriesCollection(series1);
    return coll1;
}

private IntervalXYDataset createDataset2() 
{
    // create dataset 2...
    final XYSeriesCollection coll2 = new XYSeriesCollection(series2);
    return coll2;
}
}

采纳答案by Zebby Dee

You have two datasets at the same index within the plot - make sure you're setting each dataset to a unique index:

您在图中的同一索引处有两个数据集 - 确保将每个数据集设置为唯一索引：

plot.setDataset(2, data2);
plot.setRenderer(2, renderer2);

After changing this, I ran your example with some test data and was able to see all three data sets plotted.

更改此设置后，我使用一些测试数据运行了您的示例，并且能够看到绘制的所有三个数据集。