[ Java 代碼範本 ] JFreeChart : Bar Chart - BarChartDemo5

UI Effect

Sample Code

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1. package bar.category  
2.   
3. import java.awt.Color;  
4. import java.awt.Font;  
5.   
6. import javax.swing.JPanel;  
7.   
8. import org.jfree.chart.ChartFactory;  
9. import org.jfree.chart.ChartPanel;  
10. import org.jfree.chart.JFreeChart;  
11. import org.jfree.chart.axis.AxisLocation;  
12. import org.jfree.chart.axis.CategoryAxis;  
13. import org.jfree.chart.axis.NumberAxis;  
14. import org.jfree.chart.labels.StandardCategoryItemLabelGenerator;  
15. import org.jfree.chart.plot.CategoryPlot;  
16. import org.jfree.chart.plot.PlotOrientation;  
17. import org.jfree.chart.renderer.category.BarRenderer;  
18. import org.jfree.chart.title.TextTitle;  
19. import org.jfree.data.category.CategoryDataset;  
20. import org.jfree.data.category.DefaultCategoryDataset;  
21. import org.jfree.ui.ApplicationFrame;  
22. import org.jfree.ui.RefineryUtilities;  
23.   
24. /** 
25. * http://www.jfree.org/jfreechart/BarChartDemo5.java 
26. */  
27. class BarChartDemo5 extends ApplicationFrame{  
28.     /** 
29.      * Creates a new demo instance. 
30.      * 
31.      * @param title  the frame title. 
32.      */  
33.     public BarChartDemo5(String title) {  
34.         super(title);  
35.         JPanel chartPanel = createDemoPanel();  
36.         chartPanel.setPreferredSize(new java.awt.Dimension(700, 500));  
37.         setContentPane(chartPanel);  
38.     }  
39.   
40.     /** 
41.      * Creates a sample dataset. 
42.      * 
43.      * @return A sample dataset. 
44.      */  
45.     private static CategoryDataset createDataset() {  
46.           
47.         // The following data is obtained from:  
48.         //  
49.         // http://www.homeoffice.gov.uk/rds/pdfs2/r188.pdf  
50.         //  
51.         // An arbitrary selection of countries has been included in this  
52.         // dataset, please refer to the original report for the complete  
53.         // set.  
54.         DefaultCategoryDataset dataset = new DefaultCategoryDataset();  
55.         String seriesKey = "Prison Population Rates";  
56.         dataset.addValue(59, seriesKey, "Norway");  
57.         dataset.addValue(69, seriesKey, "Switzerland");  
58.         dataset.addValue(85, seriesKey, "France");  
59.         dataset.addValue(93, seriesKey, "Syria");  
60.         dataset.addValue(96, seriesKey, "Germany");  
61.         dataset.addValue(111, seriesKey, "China");  
62.         dataset.addValue(116, seriesKey, "Australia");  
63.         dataset.addValue(121, seriesKey, "Egypt");  
64.         dataset.addValue(129, seriesKey, "England & Wales");  
65.         dataset.addValue(157, seriesKey, "New Zealand");  
66.         dataset.addValue(205, seriesKey, "Chile");  
67.         dataset.addValue(229, seriesKey, "Iran");  
68.         dataset.addValue(359, seriesKey, "Singapore");  
69.         dataset.addValue(404, seriesKey, "South Africa");  
70.         dataset.addValue(406, seriesKey, "Ukraine");  
71.         dataset.addValue(686, seriesKey, "USA");  
72.         return dataset;  
73.     }  
74.       
75.     /** 
76.      * Creates a chart. 
77.      * 
78.      * @param dataset  the dataset. 
79.      * 
80.      * @return A chart. 
81.      */  
82.     private static JFreeChart createChart(final CategoryDataset dataset) {  
83.         // create the chart...  
84.         JFreeChart chart = ChartFactory.createBarChart(  
85.             "Prison Population Rates - Selected Countries",  // chart title  
86.             "Country",                  // domain axis label  
87.             "Prisoners Per 100,000 National Population",              // range axis label  
88.             dataset,                     // data  
89.             PlotOrientation.HORIZONTAL,  // orientation  
90.             true,                        // include legend  
91.             true,  
92.             false  
93.         );  
94.         chart.addSubtitle(new TextTitle(  
95.                 "Source: http://www.homeoffice.gov.uk/rds/pdfs2/r188.pdf",  
96.                 new Font("Dialog", Font.ITALIC, 10)));  
97.         chart.setBackgroundPaint(Color.white);  
98.         CategoryPlot plot = (CategoryPlot) chart.getPlot();  
99.         plot.setBackgroundPaint(Color.lightGray);  
100.         plot.setRangeGridlinePaint(Color.white);  
101.         plot.setRangeAxisLocation(AxisLocation.BOTTOM_OR_LEFT);  
102.         BarRenderer renderer = (BarRenderer) plot.getRenderer();  
103.         renderer.setBaseItemLabelsVisible(true);  
104.         renderer.setBaseItemLabelGenerator(new StandardCategoryItemLabelGenerator());  
105.         CategoryAxis categoryAxis = plot.getDomainAxis();  
106.         categoryAxis.setCategoryMargin(0.0);  
107.         categoryAxis.setUpperMargin(0.02);  
108.         categoryAxis.setLowerMargin(0.02);  
109.         NumberAxis rangeAxis = (NumberAxis) plot.getRangeAxis();  
110.         rangeAxis.setStandardTickUnits(NumberAxis.createIntegerTickUnits());  
111.         rangeAxis.setUpperMargin(0.10);  
112.   
113.         return chart;  
114.     }  
115.       
116.     /** 
117.      * Creates a panel for the demo (used by SuperDemo.java). 
118.      * 
119.      * @return A panel. 
120.      */  
121.     public static JPanel createDemoPanel() {  
122.         JFreeChart chart = createChart(createDataset());  
123.         return new ChartPanel(chart);  
124.     }  
125.       
126.     /** 
127.      * Starting point for the demonstration application. 
128.      * 
129.      * @param args  ignored. 
130.      */  
131.     public static void main(String[] args) {  
132.   
133.         BarChartDemo5 demo = new BarChartDemo5("Bar Chart Demo 5");  
134.         demo.pack();  
135.         RefineryUtilities.centerFrameOnScreen(demo);  
136.         demo.setVisible(true);  
137.   
138.     }  
139. }