LWUIT + J4LChart 之 多種Chart

  本文來自http://blog.csdn.net/hellogv/


本文例子代碼，可以到這裡下載：http://download.csdn.net/source/886261
Lwuit就不必介紹了，至於J4LChart,就不得不介紹一下了。。。。。。 J4LChart，提供了完整的Chart圖表，從餅、線、柱等都一網打盡，並且其使用也比較簡單，Chart的式樣可以從TXT文本中讀取，當然，也可以在代碼裡修改啦，不過，用TXT檔案讀取，可以做成模板那樣，想換就換。。。。。。
下面就貼出J4LChart的使用代碼，也好簡單的：

1. package com.sun.lwuit.uidemo;
2. import com.sun.lwuit.Command;
3. import com.sun.lwuit.Form;
4. import com.sun.lwuit.events.ActionEvent;
5. import com.sun.lwuit.events.ActionListener;
6. import com.java4less.rchart.Chart;
7. import com.java4less.rchart.ChartLoader;
8. import com.java4less.rchart.gc.GraphicsProvider;
9. import com.java4less.rchart.lwuit.ChartViewer;
10. import com.java4less.rchart.util.Formats;
11. import com.sun.lwuit.Display;
12. import com.sun.lwuit.animations.Transition3D;
13. import com.sun.lwuit.geom.Dimension;
14. import com.sun.lwuit.layouts.BorderLayout;
15. import java.util.Date;
18. public class ChartDemo implements ActionListener {
19.     public Form form = new Form("J4LChart");
20.  
21.   Display display;
22.   Command nextExample= new Command("Next");
23.   Command previousExample= new Command("Previous");
24.   ChartViewer chartCanvas;
25.   ChartLoader loader;
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"};
33.   int currentExample=0;
35.   /*
36.    * 初始化Chart,從文本讀取chart圖結構並顯示
37.    */
38.     ChartDemo()
39.     {
40.         GraphicsProvider.setMode(GraphicsProvider.MODE_LWUIT);
42.         form.addCommand(previousExample);//上一個
43.         form.addCommand(nextExample);//下一個
45.         form.setCommandListener(this);
46.         chartCanvas=new ChartViewer();//chart視圖
47.         chartCanvas.setPreferredSize(new Dimension(200,200));//設定大小
48.         loadChartFromFile("/txt/"+examples[currentExample]);//讀取文本，設定chart
49.         form.setLayout(new BorderLayout());
50.         form.addComponent(BorderLayout.CENTER,chartCanvas);
51.         form.refreshTheme();
52.     }
54.   /*
55.    * 在讀取TXT檔案的同時，同時設定Chart裡面的數值
56.    */
57.     private void createRealtimedata(ChartLoader loader) {
59.         java.util.Date now=java.util.Calendar.getInstance().getTime();
60.         loader.setParameter("XAXIS_INITIAL_DATE",Formats.formatDate(now,"dd/MM/yyyy hh:mm:ss"));
61.         //  create random data based on the time
62.         java.util.Calendar cal=java.util.Calendar.getInstance();
63.         String data1="";
64.         String data2="";
65.         for (int i=0;i<9;i++) {
66.                 cal.setTime(new Date(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.         }
73.         loader.setParameter("SERIE_DATA_1",data1);
74.         loader.setParameter("SERIE_DATA_2",data2);
76.      }
77.   /*
78.    * 讀取TXT檔案並設定chart
79.    */
80.     public void loadChartFromFile(String filename) {
81.         ChartLoader cha=new ChartLoader();
82.         cha.loadFromFile(this.getClass().getResourceAsStream(filename),true);//讀取文本
83.         //this.loader=cha;
84.         //********設定Chart數值
85.         //createRealtimedata(cha);
86.         //********設定Chart數值
87.         Chart c=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.     }
94.     public void actionPerformed(ActionEvent arg0) {
95.         if(arg0.getCommand()==nextExample)//讀取上一個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]);
103.             
104.         }
105.         else if(arg0.getCommand()==previousExample)//讀取下一個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]);
114.         }
115.     }
116. }