如何在单独GUI上的面板中插入JFreeChart图表？

Question

我想使用JFreeChart在GUI中的特定面板中放置一个图表。我有2个java文件（一个是GUI，另一个是创建图形），如果可能的话，希望保持这种方式。

在主GUI中，我有一个名为PanelGraph的面板：

    JPanel panelGraph = new JPanel();
    panelGraph.setBounds(220, 64, 329, 250);
    panelMain.add(panelGraph); //it is inside the main panel
    panelGraph.setLayout(null);

    Button btnGetGraph = new JButton("Draw Graph");
    btnGetGraph.addActionListener(new ActionListener() {
        public void actionPerformed(ActionEvent arg0) {

            XYLineChart_AWT.runGraph("Cenas", "Titulo", "XLABEL", "YLABEL", panelGraph);

        }
    });
    btnGetGraph.setFont(new Font("Tahoma", Font.BOLD, 13));
    btnGetGraph.setBounds(323, 327, 128, 34);
    panelMain.add(btnGetGraph);

如下所示，是创建图的java文件：

  public class XYLineChart_AWT extends JFrame {
  public XYLineChart_AWT( String applicationTitle, String chartTitle, String xLabel, String yLabel, JPanel panel) {

  JFreeChart xylineChart = ChartFactory.createXYLineChart(
     chartTitle ,
     xLabel ,
     yLabel ,
     createDataset() ,
     PlotOrientation.VERTICAL ,
     true , false , false);

  ChartPanel chartPanel = new ChartPanel( xylineChart );
  chartPanel.setPreferredSize( panel.getSize() );


  final XYPlot plot = xylineChart.getXYPlot( );
  plot.setBackgroundPaint(new Color(240, 240, 240));
  XYLineAndShapeRenderer renderer = new XYLineAndShapeRenderer(true,false);
  renderer.setSeriesPaint( 0 , Color.BLACK );
  renderer.setSeriesStroke( 0 , new BasicStroke( 4.0f ) );
  plot.setRenderer( renderer );
  setContentPane(chartPanel);
  panel.add(chartPanel);
  }

private XYDataset createDataset( ){

  final XYSeries seno = new XYSeries ("Sin");
  for(double i=0;i<=1440;i++){
      double temp=Math.sin(i*((2*Math.PI)/640) + Math.PI) + 1;
      seno.add(i/60, temp);
  }


  final XYSeriesCollection dataset = new XYSeriesCollection( );          
  dataset.addSeries(seno);
  return dataset;
}

public static void runGraph(String appTitle, String chartTitle, String xLabel, String yLabel, JPanel panel) {
  XYLineChart_AWT chart = new XYLineChart_AWT(appTitle, chartTitle, xLabel, yLabel, panel);

  chart.pack();
  chart.setVisible(true);
  panel.setVisible(true);

 }
}

这将创建图形并将其放入指定的面板（我通过runGraph（）方法发送）。但是，它创建了第二个JFrame（我知道我创建了chart.setvisible（true），我可以将其设置为false），我不希望在我发送的面板之外创建这个JFrame。

有没有什么方法可以实现这一点，而不创建额外的JFrame？

Answer 1

不是使用XylineChartaWT构造函数实例化ChartPanel，而是将rungraph()作为一个工厂方法，返回JFreeChart用于主GUI的ChartPanel。使用图表面板方法setchart()，它将自动更新面板。要更改图表面板的默认大小，重写getPreferredSize()，如下所示。

import java.awt.BasicStroke;
import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.EventQueue;
import java.awt.event.ActionEvent;
import javax.swing.AbstractAction;
import javax.swing.JButton;
import javax.swing.JFrame;
import org.jfree.chart.ChartFactory;
import org.jfree.chart.ChartPanel;
import org.jfree.chart.JFreeChart;
import org.jfree.chart.plot.PlotOrientation;
import org.jfree.chart.plot.XYPlot;
import org.jfree.chart.renderer.xy.XYLineAndShapeRenderer;
import org.jfree.data.xy.XYDataset;
import org.jfree.data.xy.XYSeries;
import org.jfree.data.xy.XYSeriesCollection;

/**
 * @see https://stackoverflow.com/a/36757609/230513
 */
public class Test {

    private void display() {
        JFrame f = new JFrame("Test");
        f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        final ChartPanel chartPanel = new ChartPanel(null);
        f.add(chartPanel);
        f.add(new JButton(new AbstractAction("Draw Graph") {
            @Override
            public void actionPerformed(ActionEvent e) {
                chartPanel.setChart(
                    new XYLineChartAWT().runGraph("Title", "X", "Y"));
            }
        }), BorderLayout.SOUTH);
        f.pack();
        f.setLocationRelativeTo(null);
        f.setVisible(true);
    }

    public static void main(String[] args) {
        EventQueue.invokeLater(new Test()::display);
    }
}

public class XYLineChartAWT {

    public JFreeChart runGraph(String chartTitle, String xLabel, String yLabel) {
        JFreeChart xylineChart = ChartFactory.createXYLineChart(
            chartTitle,
            xLabel,
            yLabel,
            createDataset(),
            PlotOrientation.VERTICAL,
            true, false, false);
        final XYPlot plot = xylineChart.getXYPlot();
        plot.setBackgroundPaint(new Color(240, 240, 240));
        XYLineAndShapeRenderer renderer = new XYLineAndShapeRenderer(true, false);
        renderer.setSeriesPaint(0, Color.BLACK);
        renderer.setSeriesStroke(0, new BasicStroke(4.0f));
        plot.setRenderer(renderer);
        return xylineChart;
    }

    private XYDataset createDataset() {
        final XYSeries seno = new XYSeries("Sin");
        for (double i = 0; i <= 1440; i++) {
            double temp = Math.sin(i * ((2 * Math.PI) / 640) + Math.PI) + 1;
            seno.add(i / 60, temp);
        }
        final XYSeriesCollection dataset = new XYSeriesCollection();
        dataset.addSeries(seno);
        return dataset;
    }
}