JFreeChart实时折线图

package com.cityinforport.demo; import java.awt.BorderLayout; import java.awt.event.WindowAdapter; import java.awt.event.WindowEvent; import javax.swing.JFrame; 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,"time(minutes)",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); } public static void main(String[] args) { JFrame frame=new JFrame("Test Chart"); RealTimeChart rtcp=new RealTimeChart("Random Data","Random","value"); 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); } }); } }