jFreechart Punkte verschwinden, wenn Sie auf

Question

klicken

Ich habe eine Java 6/Swing-Anwendung (ja, ich weiß, aber das ist die Voraussetzung) und ich muss einige polare Plots zeigen. Alles funktioniert so gut, aber wenn ich auf den Plot klicke, verschwinden die Punkte, auch wenn ich das Fenster herumbewege. ich mit NetBeans arbeiten, hier ist ein Dummy-Code, der das gleiche Problem verwendet

Die Bibliotheken verursacht sind

• jfreechart-1.0.19.jar
• jcommon-1.0.23.jar

NewJFrame.java

import org.jfree.data.xy.XYSeries; 
import org.jfree.data.xy.XYSeriesCollection; 


public class NewJFrame extends javax.swing.JFrame { 


    private PlotHandler plotHandler; 

    public NewJFrame() { 
     initComponents(); 
     plotHandler = new PlotHandler(jPanel1, "blub", 1); 
    } 


    @SuppressWarnings("unchecked") 
    // <editor-fold defaultstate="collapsed" desc="Generated Code">       
    private void initComponents() { 

     jPanel1 = new javax.swing.JPanel(); 
     jButton1 = new javax.swing.JButton(); 

     setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE); 

     javax.swing.GroupLayout jPanel1Layout = new javax.swing.GroupLayout(jPanel1); 
     jPanel1.setLayout(jPanel1Layout); 
     jPanel1Layout.setHorizontalGroup(
      jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING) 
      .addGap(0, 504, Short.MAX_VALUE) 
     ); 
     jPanel1Layout.setVerticalGroup(
      jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING) 
      .addGap(0, 409, Short.MAX_VALUE) 
     ); 

     jButton1.setText("jButton1"); 
     jButton1.addActionListener(new java.awt.event.ActionListener() { 
      public void actionPerformed(java.awt.event.ActionEvent evt) { 
       jButton1ActionPerformed(evt); 
      } 
     }); 

     javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane()); 
     getContentPane().setLayout(layout); 
     layout.setHorizontalGroup(
      layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING) 
      .addGroup(layout.createSequentialGroup() 
       .addContainerGap() 
       .addComponent(jPanel1, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE) 
       .addContainerGap(36, Short.MAX_VALUE)) 
      .addGroup(javax.swing.GroupLayout.Alignment.TRAILING, layout.createSequentialGroup() 
       .addContainerGap(javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE) 
       .addComponent(jButton1) 
       .addGap(217, 217, 217)) 
     ); 
     layout.setVerticalGroup(
      layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING) 
      .addGroup(layout.createSequentialGroup() 
       .addComponent(jPanel1, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE) 
       .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE) 
       .addComponent(jButton1) 
       .addContainerGap()) 
     ); 

     pack(); 
    }// </editor-fold>       

    private void jButton1ActionPerformed(java.awt.event.ActionEvent evt) {           
     XYSeriesCollection data; 
     XYSeries series;//("Bearing"+getBearingIndex(i)); 
     data = new XYSeriesCollection(); 
     series = new XYSeries("Bearings"); 
     series.add(Math.random()*180/Math.PI, 
      Math.random()); 
     data.addSeries(series); 
     plotHandler.plotData(data); 
    }           

    /** 
    * @param args the command line arguments 
    */ 
    public static void main(String args[]) { 
     try { 
      for (javax.swing.UIManager.LookAndFeelInfo info : javax.swing.UIManager.getInstalledLookAndFeels()) { 
       if ("Nimbus".equals(info.getName())) { 
        javax.swing.UIManager.setLookAndFeel(info.getClassName()); 
        break; 
       } 
      } 
     } catch (ClassNotFoundException ex) { 
      java.util.logging.Logger.getLogger(NewJFrame.class.getName()).log(java.util.logging.Level.SEVERE, null, ex); 
     } catch (InstantiationException ex) { 
      java.util.logging.Logger.getLogger(NewJFrame.class.getName()).log(java.util.logging.Level.SEVERE, null, ex); 
     } catch (IllegalAccessException ex) { 
      java.util.logging.Logger.getLogger(NewJFrame.class.getName()).log(java.util.logging.Level.SEVERE, null, ex); 
     } catch (javax.swing.UnsupportedLookAndFeelException ex) { 
      java.util.logging.Logger.getLogger(NewJFrame.class.getName()).log(java.util.logging.Level.SEVERE, null, ex); 
     } 
     //</editor-fold> 

     /* Create and display the form */ 
     java.awt.EventQueue.invokeLater(new Runnable() { 
      public void run() { 
       new NewJFrame().setVisible(true); 
      } 
     }); 
    } 

    // Variables declaration - do not modify      
    private javax.swing.JButton jButton1; 
    private javax.swing.JPanel jPanel1; 
    // End of variables declaration     
} 

PlotHandler.java

import java.awt.BorderLayout; 
import javax.swing.JPanel; 
import org.jfree.data.xy.XYSeriesCollection; 

public class PlotHandler { 
    private final JPanel jPanel; 
    private final String plane; 
    private double range; 


    public PlotHandler(JPanel jPanel, String plane, double range) { 
     this.jPanel = jPanel; 
     this.plane = plane; 
     this.range = range; 

     // initialize plot 
     this.jPanel.setLayout(new java.awt.BorderLayout()); 
     this.jPanel.add(PolarPlotHandler.emptyPolarChart(range), BorderLayout.CENTER); 
     this.jPanel.validate(); 
    } 

    public void plotData(XYSeriesCollection data) { 
     jPanel.setLayout(new java.awt.BorderLayout()); 

     jPanel.add(PolarPlotHandler.createPolarChart(data, range), BorderLayout.CENTER); 
     jPanel.validate();   
    } 
} 

PolarPlotHandler.java

import java.awt.Color; 
import org.jfree.chart.ChartFactory; 
import org.jfree.chart.ChartPanel; 
import org.jfree.chart.JFreeChart; 
import org.jfree.chart.PolarChartPanel; 
import org.jfree.chart.axis.NumberAxis; 
import org.jfree.chart.axis.NumberTickUnit; 
import org.jfree.chart.plot.PolarPlot; 
import org.jfree.chart.renderer.DefaultPolarItemRenderer; 
import org.jfree.data.xy.XYDataset; 
import org.jfree.data.xy.XYSeriesCollection; 

public final class PolarPlotHandler { 

    private PolarPlotHandler() { } 

    public static ChartPanel createPolarChart(XYSeriesCollection data, double range) { 
     final XYDataset dataset = data; 
     range = 200; 
     range = Math.ceil(range/10)*10; 
     range = Math.max(1, range); 
     final JFreeChart chart = createChart(dataset, range/1000000); 
     if(data.getSeriesCount()<=1 && data.getSeries(0).getItemCount()>0) 
      chart.removeLegend(); 
     else { 

     } 
     ChartPanel chartPanel = new PolarChartPanel(chart); 
     chartPanel.setDomainZoomable(false); 
     chartPanel.setRangeZoomable(false); 

     return chartPanel; 
    } 
    private static JFreeChart createChart(final XYDataset dataset, double range) { 
     final JFreeChart chart = ChartFactory.createPolarChart(
       "", dataset, true, true, false 
     ); 
     final PolarPlot plot = (PolarPlot) chart.getPlot(); 
     // get Axis 
     plot.setAngleOffset(0); 
     plot.setCounterClockwise(true); 
     plot.getAxis().setTickLabelsVisible(false); 
     plot.setAngleTickUnit(new NumberTickUnit(45)); 
     ((NumberAxis)plot.getAxis()).setTickUnit(new NumberTickUnit(range)); 
     // find the maximum range 
     plot.getAxis().setRange(0, 2.0); 
     plot.getAxis().setVisible(true); 
     plot.setBackgroundAlpha(0.0f); 
     plot.setAngleGridlinePaint(Color.black); 
     plot.setRadiusGridlinePaint(Color.black); 
     final DefaultPolarItemRenderer renderer = (DefaultPolarItemRenderer) plot.getRenderer(); 
     renderer.setSeriesFilled(2, false); 
     return chart; 
    } 
public static ChartPanel emptyPolarChart() { 
    return emptyPolarChart(200.0); 
} 

public static ChartPanel emptyPolarChart(double range) { 
    final JFreeChart chart = createChart(new XYSeriesCollection(), range/1000000); 
    chart.removeLegend(); 
    ChartPanel chartPanel = new PolarChartPanel(chart); 
    return chartPanel; 
} 
} 

Answer 1

Es sieht aus wie Sie eine PolarPlot durch Ersetzen des gesamten zu aktualisieren sind versucht, umschließt ChartPanel. Aktualisieren Sie stattdessen die Reihe des Datasets, und das Horchdiagramm wird sich daraufhin selbst aktualisieren. Im folgenden Beispiel löscht der Handler der Schaltfläche die XYSeries der Datenmenge und fügt bei jedem Klick auf die Schaltfläche einen neuen zufälligen Punkt hinzu.

@Override 
public void actionPerformed(ActionEvent e) { 
    series.clear(); 
    series.add(r.nextDouble() * 360, r.nextDouble()); 
} 

import java.awt.BorderLayout; 
import java.awt.Color; 
import java.awt.Dimension; 
import java.awt.EventQueue; 
import java.awt.FlowLayout; 
import java.awt.event.ActionEvent; 
import java.awt.event.ActionListener; 
import java.util.Random; 
import javax.swing.JButton; 
import javax.swing.JFrame; 
import javax.swing.JPanel; 
import org.jfree.chart.ChartFactory; 
import org.jfree.chart.ChartPanel; 
import org.jfree.chart.JFreeChart; 
import org.jfree.chart.plot.PolarPlot; 
import org.jfree.data.xy.XYDataset; 
import org.jfree.data.xy.XYSeries; 
import org.jfree.data.xy.XYSeriesCollection; 

/** @see http://stackoverflow.com/a/36846122/230513 */ 
public class Test { 

    private final XYSeries series = new XYSeries("Series"); 
    private final XYDataset dataset = new XYSeriesCollection(series); 

    public Test() { 
     JFrame f = new JFrame(); 
     f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); 
     JFreeChart chart = ChartFactory.createPolarChart(
      "Title", dataset, true, true, false); 
     final PolarPlot plot = (PolarPlot) chart.getPlot(); 
     plot.setBackgroundPaint(Color.white); 
     plot.getAxis().setRange(0, 1); 
     plot.getAxis().setTickLabelsVisible(false); 
     plot.setAngleGridlinePaint(Color.black); 
     plot.setRadiusGridlinePaint(Color.black); 
     plot.setRadiusMinorGridlinesVisible(false); 
     ChartPanel chartPanel = new ChartPanel(chart) { 
      @Override 
      public Dimension getPreferredSize() { 
       return new Dimension(640, 480); 
      } 
     }; 

     JButton button = new JButton("Button"); 
     button.addActionListener(new ActionListener() { 
      Random r = new Random(); 

      @Override 
      public void actionPerformed(ActionEvent e) { 
       series.clear(); 
       series.add(r.nextDouble() * 360, r.nextDouble()); 
      } 
     }); 
     JPanel control = new JPanel(new FlowLayout(FlowLayout.RIGHT)); 
     control.add(button); 

     f.add(chartPanel, BorderLayout.CENTER); 
     f.add(control, BorderLayout.SOUTH); 
     f.pack(); 
     f.setLocationRelativeTo(null); 
     f.setVisible(true); 
    } 

    public static void main(String args[]) { 
     EventQueue.invokeLater(new Runnable() { 
      public void run() { 
       Test t = new Test(); 
      } 
     }); 
    } 
}