JFreeChart实现实时曲线图

最近要用到实时曲线图，在网上大概找了一下，有两种实现方式，一种就是JFreeChart的官方实例MemoryUsageDemo.java.通过一个实现java.Swing.Timer的内部类，在其监听器中将实时数据添加进TimeSeries，由于Timer是会实时执行的，所以这个方法倒是没有什么问题，可以参考代码。
      另一种方式就是将实时类实现Runnable接口，在其run()方法中，通过无限循环将实时数据添加进TimeSeries，下面是较简单的实现代码：

java 代码

 //RealTimeChart .java
 import org.jfree.chart.ChartFactory;
 import org.jfree.chart.ChartPanel;
 import org.jfree.chart.JFreeChart;
 import org.jfree.chart.axis.ValueAxis;
 import org.jfree.chart.plot.XYPlot;
 import org.jfree.data.time.Millisecond;
 import org.jfree.data.time.TimeSeries;
 import org.jfree.data.time.TimeSeriesCollection;

 public class RealTimeChart extends ChartPanel implements Runnable
 {
     private static TimeSeries timeSeries;
     private long value=0;

     public RealTimeChart(String chartContent,String title,String yaxisName)
     {
         super(createChart(chartContent,title,yaxisName));
     }

     private static JFreeChart createChart(String chartContent,String title,String yaxisName){
         //创建时序图对象
         timeSeries = new TimeSeries(chartContent,Millisecond.class);
         TimeSeriesCollection timeseriescollection = new TimeSeriesCollection(timeSeries);
         JFreeChart jfreechart = ChartFactory.createTimeSeriesChart(title,"时间(秒)",yaxisName,timeseriescollection,true,true,false);
         XYPlot xyplot = jfreechart.getXYPlot();
         //纵坐标设定
         ValueAxis valueaxis = xyplot.getDomainAxis();
         //自动设置数据轴数据范围
         valueaxis.setAutoRange(true);
         //数据轴固定数据范围 30s
         valueaxis.setFixedAutoRange(30000D);

         valueaxis = xyplot.getRangeAxis();
         //valueaxis.setRange(0.0D,200D);

         return jfreechart;
       }

     public void run()
     {
         while(true)
         {
         try
         {
             timeSeries.add(new Millisecond(), randomNum());
             Thread.sleep(300);
         }
         catch (InterruptedException e)  {   }
         }
     }

     private long randomNum()
     {
         System.out.println((Math.random()*20+80));
         return (long)(Math.random()*20+80);
     }
 }

 //Test.java
 import java.awt.BorderLayout;
 import java.awt.event.WindowAdapter;
 import java.awt.event.WindowEvent;
 import javax.swing.JFrame;

 public class Test
 {

     /**
      * @param args
      */
     public static void main(String[] args)
     {
     JFrame frame=new JFrame("Test Chart");
     RealTimeChart rtcp=new RealTimeChart("Random Data","随机数","数值");
     frame.getContentPane().add(rtcp,new BorderLayout().CENTER);
     frame.pack();
     frame.setVisible(true);
     (new Thread(rtcp)).start();
     frame.addWindowListener(new WindowAdapter()
     {
         public void windowClosing(WindowEvent windowevent)
         {
             System.exit(0);
         }

     });
     }
 }

          这两中方法都有一个问题，就是每实现一个图就要重新写一次，因为实时数据无法通过参数传进来，在想有没有可能通过setXXX()方式传进实时数据，那样的话就可以将实时曲线绘制类封装起来，而只需传递些参数即可(或者谁有更好的办法??)。

 

Copy:

http://favey.iteye.com/blog/112244