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:
//RealTimeChart.java importorg.jfree.chart.ChartFactory; importorg.jfree.chart.ChartPanel; importorg.jfree.chart.JFreeChart; importorg.jfree.chart.axis.ValueAxis; importorg.jfree.chart.plot.XYPlot; importorg.jfree.data.time.Millisecond; importorg.jfree.data.time.TimeSeries; importorg.jfree.data.time.TimeSeriesCollection; publicclassRealTimeChartextendsChartPanelimplementsRunnable { privatestaticTimeSeriestimeSeries; privatelongvalue=0; publicRealTimeChart(StringchartContent,Stringtitle,StringyaxisName) { super(createChart(chartContent,title,yaxisName)); } privatestaticJFreeChartcreateChart(StringchartContent,Stringtitle,StringyaxisName){ //创建时序图对象 timeSeries=newTimeSeries(chartContent,Millisecond.class); TimeSeriesCollectiontimeseriescollection=newTimeSeriesCollection(timeSeries); JFreeChartjfreechart=ChartFactory.createTimeSeriesChart(title,"时间(秒)",yaxisName,timeseriescollection,true,true,false); XYPlotxyplot=jfreechart.getXYPlot(); //纵坐标设定 ValueAxisvalueaxis=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); returnjfreechart; } publicvoidrun() { while(true) { try { timeSeries.add(newMillisecond(),randomNum()); Thread.sleep(300); } catch(InterruptedExceptione){} } } privatelongrandomNum() { System.out.println((Math.random()*20+80)); return(long)(Math.random()*20+80); } } //Test.java importjava.awt.BorderLayout; importjava.awt.event.WindowAdapter; importjava.awt.event.WindowEvent; importjavax.swing.JFrame; publicclassTest { /** *@paramargs */ publicstaticvoidmain(String[]args) { JFrameframe=newJFrame("TestChart"); RealTimeChartrtcp=newRealTimeChart("RandomData","随机数","数值"); frame.getContentPane().add(rtcp,newBorderLayout().CENTER); frame.pack(); frame.setVisible(true); (newThread(rtcp)).start(); frame.addWindowListener(newWindowAdapter() { publicvoidwindowClosing(WindowEventwindowevent) { 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?
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