<div class="pleft">     <div class="newsview">      <div class="content">       <div id="blog_text" class="cnt">        <p>原理是jfreechart雷达图+折线</p>        <p>在设置折现图像颜色 以及 设置雷达图像网格数量费解，后来解决。（注释部分）</p>        <p>由于网上jfreechart的资料太多重复，在细节上还比较模糊。希望看到更多的资料分享 ：）</p>        <pre class="brush:java; toolbar: true; auto-links: false;">package meigui;  import java.awt.Color; import java.awt.Dimension; import java.awt.GradientPaint; import java.awt.event.MouseWheelEvent; import java.awt.event.MouseWheelListener;  import javax.swing.JPanel;  import org.jfree.chart.ChartFactory; 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.event.ChartChangeEvent; import org.jfree.chart.event.ChartChangeListener; import org.jfree.chart.plot.PolarPlot; import org.jfree.chart.renderer.DefaultPolarItemRenderer; 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.RectangleInsets; import org.jfree.ui.RefineryUtilities;  public class PolarChartDemo1 extends ApplicationFrame {  public PolarChartDemo1(String s) {    super(s);    JPanel jpanel = createDemoPanel();    jpanel.setPreferredSize(new Dimension(600, 500));    setContentPane(jpanel); }  private static XYDataset createDataset() {    XYSeriesCollection xyseriescollection = new XYSeriesCollection();    XYSeries xyseries = new XYSeries("Series       1 ");    xyseries.add(0.0D, 2D);    xyseries.add(90D, 13D);    xyseries.add(180D, 9D);    xyseries.add(270D, 8D);    xyseriescollection.addSeries(xyseries);    XYSeries xyseries1 = new XYSeries("Series       2 ");    xyseries1.add(90D, -11.199999999999999D);    xyseries1.add(180D, 21.399999999999999D);    xyseries1.add(250D, 17.300000000000001D);    xyseries1.add(355D, 10.9D);    xyseriescollection.addSeries(xyseries1);    return xyseriescollection; }  private static JFreeChart createChart(XYDataset xydataset) {    JFreeChart jfreechart = ChartFactory.createPolarChart(      "Polar       Chart       Demo       1 ", xydataset, true,      false, false);    jfreechart.setBackgroundPaint(Color.white);    PolarPlot polarplot = (PolarPlot) jfreechart.getPlot();    polarplot.setBackgroundPaint(Color.lightGray);    polarplot.addCornerTextItem("Corner       Item       1 ");    polarplot.addCornerTextItem("Corner       Item       2 ");    polarplot.setBackgroundImageAlignment(PolarPlot.MINIMUM_HEIGHT_TO_DRAW);    polarplot.setAngleTickUnit(new NumberTickUnit(45));    // polarplot.setAngleGridlinesVisible(false);     // 设置雷达颜色    GradientPaint gradientpaint3 = new GradientPaint(0.0F, 0.0F,      Color.black, 0.0F, 0.0F, Color.black);    polarplot.setRadiusGridlinePaint(gradientpaint3);//     // 两个四边形颜色    GradientPaint gradientpaint1 = new GradientPaint(0.0F, 0.0F, Color.red,      0.0F, 0.0F, Color.red); //    GradientPaint gradientpaint2 = new GradientPaint(0.0F, 0.0F,      Color.blue, 0.0F, 0.0F, Color.blue); // ���ɫ    // 设置两个四边形颜色    DefaultPolarItemRenderer renderer = new DefaultPolarItemRenderer();    renderer.setSeriesPaint(0, gradientpaint1);    renderer.setSeriesPaint(1, gradientpaint2);    polarplot.setRenderer(renderer);     NumberAxis numberaxis = (NumberAxis) polarplot.getAxis();    numberaxis.setStandardTickUnits(NumberAxis.createIntegerTickUnits());    numberaxis.setAutoRange(true);    numberaxis.setVisible(false);    numberaxis.setTickUnit(new NumberTickUnit(2));// 设置雷达网格数量     return jfreechart; }  public static JPanel createDemoPanel() {    final JFreeChart jfreechart = createChart(createDataset());    ChartPanel chartpanel = new ChartPanel(jfreechart);    // chartpanel.setMouseZoomable(true);// 是否可以鼠标放大    //通过鼠标滚轮放大缩小放大，整体都放大缩小，寻找更好方法ing    chartpanel.addMouseWheelListener(new MouseWheelListener() {      public void mouseWheelMoved(MouseWheelEvent e) {      if (-3 == e.getUnitsToScroll()) {       jfreechart.setPadding(new RectangleInsets(jfreechart         .getPadding().getTop() - 10, jfreechart         .getPadding().getBottom() - 10, jfreechart         .getPadding().getLeft() - 10, jfreechart         .getPadding().getRight() - 10));       System.out.println("向上");      } else if (3 == e.getUnitsToScroll()){       jfreechart.setPadding(new RectangleInsets(jfreechart         .getPadding().getTop() + 10, jfreechart         .getPadding().getBottom() + 10, jfreechart         .getPadding().getLeft() + 10, jfreechart         .getPadding().getRight() + 10));       System.out.println("向下");      }     }     });    return chartpanel; }  public static void main(String args[]) {    PolarChartDemo1 polarchartdemo1 = new PolarChartDemo1(      "Polar       Chart       Demo ");    polarchartdemo1.pack();    RefineryUtilities.centerFrameOnScreen(polarchartdemo1);    polarchartdemo1.setVisible(true); }  }</pre>        <img title="1710500.jpg" border="0" alt="1710500.jpg" src="https://simg.open-open.com/show/7776c4674e6db3245f899f14096f7d19.jpg" width="609" height="530" />         <p align="left">//放大部分另一种写法 - -</p>        <p align="left"> </p>        <pre class="brush:java; toolbar: true; auto-links: false;">  chartpanel.addMouseWheelListener(new MouseWheelListener() {     public void mouseWheelMoved(MouseWheelEvent e) {      if (-3 == e.getUnitsToScroll()) {       chartpanel.zoomInBoth(10, 10);       System.out.println("向上");      } else if (3 == e.getUnitsToScroll()) {       chartpanel.zoomOutBoth(10, 10);       System.out.println("向下");      }     }    });</pre>        <p></p>       </div>      </div>     </div>    </div>