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Java > Open Source Codes > de > laures > cewolf > cpp > RotatedAxisLabels


1 package de.laures.cewolf.cpp;
2
3 import java.util.Map JavaDoc;
4
5 import org.jfree.chart.JFreeChart;
6 import org.jfree.chart.axis.CategoryAxis;
7 import org.jfree.chart.axis.CategoryLabelPositions;
8 import org.jfree.chart.plot.CategoryPlot;
9 import org.jfree.data.category.CategoryDataset;
10
11 import de.laures.cewolf.ChartPostProcessor;
12
13 /**
14 * A cewolf post-processor for rotating and/or removing the labels on the X-Axis
15 * parameters:
16 * rotate_at: make the labels vertical
17 * skip_at: print only some of the labels (so they don't overlap)
18 * remove_at: don't print any labels
19 *
20 * Usage:
21 * <chart:chartpostprocessor id="labelRotation">
22 * <chart:param name="rotate_at" value='<%= new Integer(10) %>'/>
23 * <chart:param name="skip_at" value='<%= new Integer(50) %>'/>
24 * <chart:param name="remove_at" value='<%= new Integer(100) %>'/>
25 * </chart:chartpostprocessor>
26 *
27 *
28 * @author Rich Unger
29 */
30
31 public class RotatedAxisLabels implements ChartPostProcessor {
32     
33 public void processChart(Object JavaDoc chart, Map JavaDoc params) {
34         CategoryPlot plot = (CategoryPlot) ((JFreeChart) chart).getPlot();
35
36         CategoryAxis axis = plot.getDomainAxis();
37
38         Number JavaDoc rotateThreshold = (Number JavaDoc) params.get("rotate_at");
39         Number JavaDoc skipThreshold = (Number JavaDoc) params.get("skip_at");
40         Number JavaDoc removeThreshold = (Number JavaDoc) params.get("remove_at");
41
42         CategoryDataset dataset = plot.getDataset();
43         int iCategoryCount = dataset.getRowCount();
44
45         if (rotateThreshold != null)
46     {
47       if (iCategoryCount >= rotateThreshold.intValue())
48       {
49         axis.setCategoryLabelPositions(CategoryLabelPositions.UP_90);
50       }
51       else
52       {
53         axis.setCategoryLabelPositions(CategoryLabelPositions.STANDARD);
54       }
55
56     }
57     
58         if (skipThreshold != null)
59     {
60       //this method does nothing in jfreechart .9.18
61 //axis.setSkipCategoryLabelsToFit(iCategoryCount >= skipThreshold.intValue());
62 }
63         
64     if (removeThreshold != null)
65     {
66             axis.setTickLabelsVisible(iCategoryCount < removeThreshold.intValue());
67         }
68     }
69     
70 }
71
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