单击按钮时不显示JFreeChart
我在面板中看不到此代码的输出，但在控制台点（X，Y）出现。 我搜索越来越多，没有。
这是UI类：
/* * To change this license header, choose License Headers in Project Properties. * To change this template file, choose Tools | Templates * and open the template in the editor. */ package com.dspTasks.UI; import dsp.ReadFile; import java.awt.BorderLayout; import java.io.FileNotFoundException; import java.util.ArrayList; import java.util.logging.Level; import java.util.logging.Logger; import javax.swing.JPanel; import org.jfree.*; import org.jfree.chart.ChartFactory; import org.jfree.chart.ChartPanel; import org.jfree.chart.JFreeChart; import org.jfree.chart.plot.PlotOrientation; import org.jfree.data.xy.XYDataset; import org.jfree.data.xy.XYSeries; import org.jfree.data.xy.XYSeriesCollection; /** * * @author fathy */ public class out extends javax.swing.JFrame { /** * Creates new form out */ public out() { initComponents(); this.setVisible(true); } /** * This method is called from within the constructor to initialize the form. * WARNING: Do NOT modify this code. The content of this method is always * regenerated by the Form Editor. */ @SuppressWarnings("unchecked") // private void initComponents() { jPanel1 = new javax.swing.JPanel(); jLabel1 = new javax.swing.JLabel(); jTextField1 = new javax.swing.JTextField(); loadSignal1 = new javax.swing.JButton(); run = new javax.swing.JButton(); setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE); jLabel1.setFont(new java.awt.Font("Tahoma", 1, 18)); // NOI18N jLabel1.setText("path"); jTextField1.setToolTipText("file path"); jTextField1.setName("path"); // NOI18N loadSignal1.setText("load signal1"); run.setText("run"); run.addActionListener(new java.awt.event.ActionListener() { public void actionPerformed(java.awt.event.ActionEvent evt) { runActionPerformed(evt); } }); javax.swing.GroupLayout jPanel1Layout = new javax.swing.GroupLayout(jPanel1); jPanel1.setLayout(jPanel1Layout); jPanel1Layout.setHorizontalGroup( jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING) .addGroup(jPanel1Layout.createSequentialGroup() .addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING) .addGroup(jPanel1Layout.createSequentialGroup() .addGap(391, 391, 391) .addComponent(run)) .addGroup(jPanel1Layout.createSequentialGroup() .addGap(213, 213, 213) .addComponent(loadSignal1)) .addGroup(jPanel1Layout.createSequentialGroup() .addGap(23, 23, 23) .addComponent(jLabel1, javax.swing.GroupLayout.PREFERRED_SIZE, 94, javax.swing.GroupLayout.PREFERRED_SIZE) .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED) .addComponent(jTextField1, javax.swing.GroupLayout.PREFERRED_SIZE, 399, javax.swing.GroupLayout.PREFERRED_SIZE))) .addContainerGap(392, Short.MAX_VALUE)) ); jPanel1Layout.setVerticalGroup( jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING) .addGroup(jPanel1Layout.createSequentialGroup() .addContainerGap() .addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE) .addComponent(jLabel1, javax.swing.GroupLayout.PREFERRED_SIZE, 29, javax.swing.GroupLayout.PREFERRED_SIZE) .addComponent(jTextField1, javax.swing.GroupLayout.PREFERRED_SIZE, 29, javax.swing.GroupLayout.PREFERRED_SIZE)) .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.UNRELATED) .addComponent(loadSignal1) .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED, 360, Short.MAX_VALUE) .addComponent(run)) ); 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.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE) .addContainerGap()) ); layout.setVerticalGroup( layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING) .addGroup(layout.createSequentialGroup() .addContainerGap() .addComponent(jPanel1, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE) .addContainerGap()) ); pack(); }// private void runActionPerformed(java.awt.event.ActionEvent evt) { try { JPanel chartPanel=createChartPanel(); this.add(chartPanel,BorderLayout.CENTER); } catch (FileNotFoundException ex) { System.err.println(ex); } } private JPanel createChartPanel() throws FileNotFoundException{ String chartTitle="signal chart"; String XLabel="Voltage(V)"; String YLabel = "Time(T)"; XYDataset dataset=createDataSet(); JFreeChart chart= ChartFactory.createXYLineChart(YLabel, YLabel, YLabel, dataset); return new ChartPanel(chart); } private XYDataset createDataSet() throws FileNotFoundException{ XYSeriesCollection dataset=new XYSeriesCollection(); XYSeries signal1=new XYSeries("signal1"); //XYSeries signal2= new XYSeries("signal2"); ArrayList dataSignal=ReadFile.readFile(); for(int i=0;i<dataSignal.size();i++){ signal1.add(i+1, (Double) dataSignal.get(i)); } dataset.addSeries(signal1); for(int i=0;i<2000;i++){ System.out.println(signal1.getDataItem(i)); } return dataset; } /** * @param args the command line arguments */ public static void main(String args[]) { /* Set the Nimbus look and feel */ // /* If Nimbus (introduced in Java SE 6) is not available, stay with the default look and feel. * For details see http://download.oracle.com/javase/tutorial/uiswing/lookandfeel/plaf.html */ 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(out.class.getName()).log(java.util.logging.Level.SEVERE, null, ex); } catch (InstantiationException ex) { java.util.logging.Logger.getLogger(out.class.getName()).log(java.util.logging.Level.SEVERE, null, ex); } catch (IllegalAccessException ex) { java.util.logging.Logger.getLogger(out.class.getName()).log(java.util.logging.Level.SEVERE, null, ex); } catch (javax.swing.UnsupportedLookAndFeelException ex) { java.util.logging.Logger.getLogger(out.class.getName()).log(java.util.logging.Level.SEVERE, null, ex); } // /* Create and display the form */ java.awt.EventQueue.invokeLater(new Runnable() { public void run() { new out().setVisible(true); } }); } // Variables declaration - do not modify private javax.swing.JLabel jLabel1; private javax.swing.JPanel jPanel1; private javax.swing.JTextField jTextField1; private javax.swing.JButton loadSignal1; private javax.swing.JButton run; // End of variables declaration }
类从信号文件读取数据，其中包括一些双数字，如下所示：
4 3.99950652992664 3.99802624146293 3.99555949984788 3.99210691371309 3.98766933493251 3.98224785841232 3.97584382182072 3.96845880525791 3.96009463086623 3.95075336238055 3.94043730461910 3.92914900291476 3.91689124248706 3.90366704775499 3.88947968159071 3.87433264451452 3.85822967383119 3.84117474270777 3.82317205919332 3.80422606518061
读取文件：
package dsp; import java.io.File; import java.io.FileNotFoundException; import java.util.ArrayList; import java.util.Scanner; /* * To change this license header, choose License Headers in Project Properties. * To change this template file, choose Tools | Templates * and open the template in the editor. */ /** * * @author fathy */ public class ReadFile { public static ArrayList readFile() throws FileNotFoundException{ ArrayList signalData= new ArrayList(); Scanner input = new Scanner(new File("signal1")); while(input.hasNext()){ signalData.add(input.nextDouble()); } return signalData; } }
您只需更新图表数据集中的相关系列，而不是替换操作处理程序中的图表。 为了使下面的示例自包含，我替换了readFile()并将返回类型更改为List 。
我不明白我犯了什么错误？
您尝试add()新的ChartPanel “会使组件层次结构无效。如果已经显示了容器，则必须在此后validation层次结构以显示添加的组件。” 下面显示的方法消除了这种需要。
import java.awt.BorderLayout; import java.awt.EventQueue; import java.awt.FlowLayout; import java.awt.event.ActionEvent; import java.util.List; import java.util.Random; import java.util.stream.Collectors; import java.util.stream.Stream; import javax.swing.AbstractAction; 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.data.xy.XYSeries; import org.jfree.data.xy.XYSeriesCollection; /** * @see http://stackoverflow.com/a/37020264/230513 */ public class Test { private final XYSeries signal = new XYSeries("signal"); private final XYSeriesCollection dataset = new XYSeriesCollection(signal); private void display() { JFrame f = new JFrame("Test"); f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); JFreeChart chart = ChartFactory.createXYLineChart( "Signal chart", "Time(T)", "Voltage(V)", dataset); f.add(new ChartPanel(chart)); JPanel p = new JPanel(new FlowLayout(FlowLayout.RIGHT)); p.add(new JButton(new AbstractAction("Load signal") { @Override public void actionPerformed(ActionEvent e) { signal.clear(); List list = ReadFile.readFile(); int i = 0; for (Double d : list) { signal.add(i++, d); } } })); f.add(p, BorderLayout.SOUTH); f.pack(); f.setLocationRelativeTo(null); f.setVisible(true); } private static class ReadFile { private static final Random R = new Random(); public static List readFile() { List list = Stream.iterate(4.0, x -> x - (R.nextDouble() / 42)) .limit(42).collect(Collectors.toList()); return list; } } public static void main(String[] args) { EventQueue.invokeLater(new Test()::display); } }
this.revalidate(); //is your solution.
单击按钮后，它会更新框架。 因此，使图表显示为更新框架。