最近要用到實時曲線圖，在網(wǎng)上大概找了一下，有兩種實現(xiàn)方式，一種就是jfreechart的官方實例memoryusagedemo.java.通過一個實現(xiàn)java.swing.timer的內(nèi)部類，在其監(jiān)聽器中將實時數(shù)據(jù)添加進timeseries，由于timer是會實時執(zhí)行的，所以這個方法倒是沒有什么問題，可以參考代碼。
另一種方式就是將實時類實現(xiàn)runnable接口，在其run()方法中，通過無限循環(huán)將實時數(shù)據(jù)添加進timeseries，下面是較簡單的實現(xiàn)代碼：
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//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){ //創(chuàng)建時序圖對象 timeseries = new timeseries(chartcontent,millisecond.class); timeseriescollection timeseriescollection = new timeseriescollection(timeseries); jfreechart jfreechart = chartfactory.createtimeserieschart(title,"時間(秒)",yaxisname,timeseriescollection,true,true,false); xyplot xyplot = jfreechart.getxyplot(); //縱坐標設(shè)定 valueaxis valueaxis = xyplot.getdomainaxis(); //自動設(shè)置數(shù)據(jù)軸數(shù)據(jù)范圍 valueaxis.setautorange(true); //數(shù)據(jù)軸固定數(shù)據(jù)范圍 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","隨機數(shù)","數(shù)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); } }); } } |
這兩中方法都有一個問題，就是每實現(xiàn)一個圖就要重新寫一次，因為實時數(shù)據(jù)無法通過參數(shù)傳進來，在想有沒有可能通過setxxx()方式傳進實時數(shù)據(jù)，那樣的話就可以將實時曲線繪制類封裝起來，而只需傳遞些參數(shù)即可，或者誰有更好的辦法？
以上就是本文的全部內(nèi)容，希望對大家的學習有所幫助，也希望大家多多支持服務器之家。
原文鏈接：https://blog.csdn.net/finethere/article/details/80722746
