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:
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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){
//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 );
}
});
}
}
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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?
以上就是本文的全部内容,希望对大家的学习有所帮助,也希望大家多多支持服务器之家。
原文链接:https://blog.csdn.net/finethere/article/details/80722746