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