我的目标是使用JFreeChart XY散点图显示一些数据,以便在按下jButton时显示绘图,并且还可以单击绘图上的数据点并查看有关它们的一些其他信息。在推送jButton之后,从外部数据文件导入数据点并创建散点图。绘图按预期工作,但绘图不会对鼠标点击做出反应。
我试图将ChartMouseListener添加到包含散点图的图表面板中,但它似乎没有记录鼠标点击或对点击没有反应。
这是代码的一部分:
ChartPanel chapa = new ChartPanel(scatterchart);
chapa.addChartMouseListener(new ChartMouseListener(){
@Override
public void chartMouseClicked(ChartMouseEvent event){
ChartEntity entity = event.getEntity();
if (entity != null && entity instanceof XYItemEntity) {
XYItemEntity ent = (XYItemEntity) entity;
int serindex = ent.getSeriesIndex();
int itemindex = ent.getItem();
JOptionPane.showMessageDialog(null, serindex);
System.out.println(serindex);
}
}
@Override
public void chartMouseMoved(ChartMouseEvent cme) {}
});
jPanel2.setLayout(new java.awt.BorderLayout());
jPanel2.add(chapa, BorderLayout.CENTER);
jPanel2.validate();
在该部分上方创建散点图。所有代码都位于jButtonActionPerformed方法内,并由try和catch块包围(用于捕获处理图表数据所必需的BiffException,IOException和SQLException)。
单击散点图上的数据点时,应显示一个消息窗口,其中包含包含该数据点的XY系列索引,该索引也应由System.out.println传递,但实际上在单击数据时没有任何反应点。代码有什么问题?谢谢你的帮助。
我设法找到了解决方案。代码没问题,有一个更简单的错误 - 程序包含许多生成散点图的jButton,但不是每个jButton都创建一个带有chartMouseListener的图表。在运行程序时,一个这样的jButton被推送而不是正确的,因此散点图没有对点击作出反应,因为它只是没有chartMouseListener ...
在寻找解决方案并尝试不同的选项时,我编写了一个更简单的代码(只有一个jButton和一个jPanel)具有相同的想法。它会创建一个简单的散点图并打印出所单击数据点的x坐标。我在这里发布,也许它可以作为某人的一个例子(复制并保存为“graphclick”):
import java.awt.BorderLayout;
import javax.swing.JOptionPane;
import org.jfree.chart.ChartFactory;
import org.jfree.chart.ChartMouseEvent;
import org.jfree.chart.ChartMouseListener;
import org.jfree.chart.ChartPanel;
import org.jfree.chart.JFreeChart;
import org.jfree.chart.axis.ValueAxis;
import org.jfree.chart.entity.ChartEntity;
import org.jfree.chart.entity.XYItemEntity;
import org.jfree.chart.plot.XYPlot;
import org.jfree.data.xy.XYSeries;
import org.jfree.data.xy.XYSeriesCollection;
public class graphclick extends javax.swing.JFrame {
public graphclick() {
initComponents();
}
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, 0, Short.MAX_VALUE)
);
jPanel1Layout.setVerticalGroup(
jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGap(0, 421, 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.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
.addContainerGap())
.addGroup(layout.createSequentialGroup()
.addGap(365, 365, 365)
.addComponent(jButton1)
.addContainerGap(383, Short.MAX_VALUE))
);
layout.setVerticalGroup(
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)
.addGap(18, 18, 18)
.addComponent(jButton1)
.addContainerGap(59, Short.MAX_VALUE))
);
pack();
}
// HERE IS THE MAIN ACTION TAKING PLACE
private void jButton1ActionPerformed(java.awt.event.ActionEvent evt) {
XYSeriesCollection impser = new XYSeriesCollection();
try {
XYSeries series1 = new XYSeries("Series1");
series1.add(1.0, 2.0);
series1.add(2.0, 2.5);
series1.add(3.0, 2.0);
impser.addSeries(series1);
JFreeChart scatterchart = ChartFactory.createScatterPlot("", "X", "Y", impser);
XYPlot xyplot = scatterchart.getXYPlot();
ValueAxis domainAxis = xyplot.getDomainAxis(); // x-axis
ValueAxis rangeAxis = xyplot.getRangeAxis();
domainAxis.setRange(0.0, impser.getDomainUpperBound(false) + 1.0);
rangeAxis.setRange(0.0, impser.getRangeUpperBound(true) + 1.0);
jPanel1.removeAll();
ChartPanel chapa = new ChartPanel(scatterchart);
chapa.addChartMouseListener(new ChartMouseListener(){
@Override
public void chartMouseClicked(ChartMouseEvent event){
ChartEntity entity = event.getEntity();
if (entity != null && entity instanceof XYItemEntity) {
XYItemEntity ent = (XYItemEntity) entity;
int sindex = ent.getSeriesIndex();
int iindex = ent.getItem();
XYSeries ser = impser.getSeries(sindex);
System.out.println(impser.getX(sindex, iindex));
}
}
@Override
public void chartMouseMoved(ChartMouseEvent cme) {}
});
jPanel1.setLayout(new java.awt.BorderLayout());
jPanel1.add(chapa, BorderLayout.CENTER);
jPanel1.validate();
} catch (Exception e) {
JOptionPane.showMessageDialog(null, "Error: " + e.getMessage());
}
}
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(graphclick.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (InstantiationException ex) {
java.util.logging.Logger.getLogger(graphclick.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (IllegalAccessException ex) {
java.util.logging.Logger.getLogger(graphclick.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (javax.swing.UnsupportedLookAndFeelException ex) {
java.util.logging.Logger.getLogger(graphclick.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 graphclick().setVisible(true);
}
});
}
private javax.swing.JButton jButton1;
private javax.swing.JPanel jPanel1;
}