Question

你好我必须制作一个显示功率曲线的程序，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），条和带线的XY。

我的问题：某种程度上我只能得到两张图表而且我无法正确更改单张图表的颜色。

编辑：当我把第三张图表的声明作为评论时，第二张图最终被绘制出来。绘制三张图表是不可能的吗？

非常感谢任何帮助，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;
}
}

Answer 1

您在绘图中的同一索引处有两个数据集 - 请确保将每个数据集设置为唯一索引：

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

更改后，我使用一些测试数据运行了您的示例，并且能够看到所有三个数据集都已绘制。

使用JFreechart（bar，XY）绘制多个绘图

1 个答案: