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:
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
|
//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 ); } }); } } |
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