realtimechart.java

jfreechart 柱状图 均值图 和值图 实例

package zyyt.youTian;
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);   
    }   
}