LWUIT + J4LChart 之 多种Chart

本文来自http://blog.csdn.net/hellogv/


本文例子代码，可以到这里下载：http://download.csdn.net/source/886261
Lwuit就不必介绍了，至于J4LChart,就不得不介绍一下了。。。。。。 J4LChart，提供了完整的Chart图表，从饼、线、柱等都一网打尽，并且其使用也比较简单，Chart的式样可以从TXT文本中读取，当然，也可以在代码里修改啦，不过，用TXT文件读取，可以做成模板那样，想换就换。。。。。。
下面就贴出J4LChart的使用代码，也好简单的：

1. packagecom.sun.lwuit.uidemo;
2. importcom.sun.lwuit.Command;
3. importcom.sun.lwuit.Form;
4. importcom.sun.lwuit.events.ActionEvent;
5. importcom.sun.lwuit.events.ActionListener;
6. importcom.java4less.rchart.Chart;
7. importcom.java4less.rchart.ChartLoader;
8. importcom.java4less.rchart.gc.GraphicsProvider;
9. importcom.java4less.rchart.lwuit.ChartViewer;
10. importcom.java4less.rchart.util.Formats;
11. importcom.sun.lwuit.Display;
12. importcom.sun.lwuit.animations.Transition3D;
13. importcom.sun.lwuit.geom.Dimension;
14. importcom.sun.lwuit.layouts.BorderLayout;
15. importjava.util.Date;
16. 
    
17. 
    
18. publicclassChartDemoimplementsActionListener{
19. publicFormform=newForm("J4LChart");
21. Displaydisplay;
22. CommandnextExample=newCommand("Next");
23. CommandpreviousExample=newCommand("Previous");
24. ChartViewerchartCanvas;
25. ChartLoaderloader;
26. 
    
27. String[]examples={"areaChart.txt","areaCurves.txt","axisOnTop.txt","barChart3D.txt","barChart3D.txt","barChart.txt",
28. "barImages.txt","bubbleChart.txt","candleStick.txt","combined2Positions.txt","combinedChart.txt","event.txt","linechart3D.txt",
29. "linechart.txt","linechartClipping.txt","linechartNULLS.txt","MultiAxis.txt","MultiCharts.txt","patternFilling.txt",
30. "piechart3D.txt","PieDrillDown.txt","radarChart.txt","realtime.txt","scatterChart.txt","stackedBar.txt","StackedMultiAxis.txt",
31. "subpie1.txt","subpie2.txt","subpie3.txt","targetZones.txt"};
32. 
    
33. intcurrentExample=0;
34. 
    
35. /*
36. *初始化Chart,从文本读取chart图结构并显示
37. */
38. ChartDemo()
39. {
40. GraphicsProvider.setMode(GraphicsProvider.MODE_LWUIT);
41. 
    
42. form.addCommand(previousExample);//上一个
43. form.addCommand(nextExample);//下一个
44. 
    
45. form.setCommandListener(this);
46. chartCanvas=newChartViewer();//chart视图
47. chartCanvas.setPreferredSize(newDimension(200,200));//设置大小
48. loadChartFromFile("/txt/"+examples[currentExample]);//读取文本，设置chart
49. form.setLayout(newBorderLayout());
50. form.addComponent(BorderLayout.CENTER,chartCanvas);
51. form.refreshTheme();
52. }
53. 
    
54. /*
55. *在读取TXT文件的同时，同时设置Chart里面的数值
56. */
57. privatevoidcreateRealtimedata(ChartLoaderloader){
58. 
    
59. java.util.Datenow=java.util.Calendar.getInstance().getTime();
60. loader.setParameter("XAXIS_INITIAL_DATE",Formats.formatDate(now,"dd/MM/yyyyhh:mm:ss"));
61. //createrandomdatabasedonthetime
62. java.util.Calendarcal=java.util.Calendar.getInstance();
63. Stringdata1="";
64. Stringdata2="";
65. for(inti=0;i<9;i++){
66. cal.setTime(newDate(cal.getTime().getTime()-2000));
67. if(data1.length()>0)data1="|"+data1;
68. data1=""+cal.get(java.util.Calendar.SECOND)+data1;
69. if(data2.length()>0)data2="|"+data2;
70. data2=""+(cal.get(java.util.Calendar.SECOND)/6)+data2;
71. }
72. 
    
73. loader.setParameter("SERIE_DATA_1",data1);
74. loader.setParameter("SERIE_DATA_2",data2);
75. 
    
76. }
77. /*
78. *读取TXT文件并设置chart
79. */
80. publicvoidloadChartFromFile(Stringfilename){
81. ChartLoadercha=newChartLoader();
82. cha.loadFromFile(this.getClass().getResourceAsStream(filename),true);//读取文本
83. //this.loader=cha;
84. //********设置Chart数值
85. //createRealtimedata(cha);
86. //********设置Chart数值
87. Chartc=cha.build(false,false);//建立chart
88. chartCanvas.setChart(c);
89. chartCanvas.getChart().setSize(chartCanvas.getWidth(),chartCanvas.getHeight());
90. chartCanvas.repaintChart();
91. form.setTitle(filename);
92. }
93. 
    
94. publicvoidactionPerformed(ActionEventarg0){
95. if(arg0.getCommand()==nextExample)//读取上一个chart(TXT文本)
96. {
97. chartCanvas.getChart().stopUpdater();
98. currentExample++;
99. if(currentExample>=examples.length-1)
100. currentExample=0;
101. form.replace(chartCanvas,chartCanvas,Transition3D.createRotation(500,true));
102. loadChartFromFile("/txt/"+examples[currentExample]);
104. }
105. elseif(arg0.getCommand()==previousExample)//读取下一个chart(TXT文本)
106. {
107. chartCanvas.getChart().stopUpdater();
108. currentExample--;
109. if(currentExample<=0)
110. currentExample=examples.length-1;
111. form.replace(chartCanvas,chartCanvas,Transition3D.createRotation(500,false));
112. loadChartFromFile("/txt/"+examples[currentExample]);
113. 
     
114. }
115. }
116. }