JFreeChart兑现实时曲线图
发布时间： 2012-10-13 11:38:17 作者： rapoo
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=??????????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(????????catch?(InterruptedException?e)??{???}??????????}?????????????}????????????private?long?randomNum()??????{?????????????System.out.println((Math.random()*return?(long)(Math.random()*????}??}????//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(????????}????????});??????}??}?
????????? 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??)。
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Copy:
http://favey.iteye.com/blog/112244