Mercurial > dive4elements > river

annotate flys-artifacts/src/main/java/de/intevation/flys/exports/LegendProcessor.java @ 4242:448cbd8708d5

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
Added new classes for the last commit.
author Ingo Weinzierl <ingo.weinzierl@intevation.de>
date Wed, 24 Oct 2012 14:44:12 +0200
parents 3dc26ec2558d
children
rev   line source
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05c84d65988a Extracted legenditemaggregation from xychartgenerator.
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1 package de.intevation.flys.exports;
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2
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3 import java.awt.geom.Line2D;
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4 import java.util.ArrayList;
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5 import java.util.HashMap;
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6 import java.util.Iterator;
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7 import java.util.LinkedHashMap;
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8 import java.util.List;
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9
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10 import org.jfree.chart.LegendItem;
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11 import org.jfree.chart.LegendItemCollection;
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12 import org.jfree.chart.plot.XYPlot;
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13
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14
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15 /** Class to process Plots legends. */
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16 public abstract class LegendProcessor {
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17
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18 /** (Empty) shape for aggregated Legend Items. */
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19 private static final Line2D.Double SPACE = new Line2D.Double(0,0,0,0);
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20
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21
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22 /** Prevent instantiations. */
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23 private LegendProcessor() {
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24 }
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25
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26
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27 /**
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28 * Create a hash from a legenditem.
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29 * This hash can then be used to merge legend items labels.
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30 * @return hash for given legenditem to identify mergeables.
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31 */
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32 protected static String legendItemHash(LegendItem li) {
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33 // TODO Do proper implementation. Ensure that only mergable sets are created.
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34 // getFillPaint()
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35 // getFillPaintTransformer()
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36 // getLabel()
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37 // getLine()
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38 // getLinePaint()
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39 // getLineStroke()
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40 // getOutminePaint()
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41 // getOutlineStroke()
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42 // Shape getShape()
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43 // String getToolTipText()
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44 // String getURLText()
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45 // boolean isLineVisible()
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46 // boolean isShapeFilled()
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47 // boolean isShapeOutlineVisible()
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48 // boolean isShapeVisible()
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49 String hash = li.getLinePaint().toString();
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50 // XXX: DEAD CODE // String label = li.getLabel();
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51 /*if (label.startsWith("W (") || label.startsWith("W(")) {
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52 hash += "-W-";
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53 }
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54 else if (label.startsWith("Q(") || label.startsWith("Q (")) {
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55 hash += "-Q-";
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56 }*/
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57
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58 // WQ.java holds example of using regex Matcher/Pattern.
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59
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60 return hash;
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61 }
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62
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63
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64 /**
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65 * Create new legend entries, dependent on settings.
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66 * @param plot The plot for which to modify the legend.
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67 * @param threshold How many items are needed for aggregation to
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68 * be triggered?
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69 */
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70 public static void aggregateLegendEntries(XYPlot plot, int threshold) {
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71 LegendItemCollection old = plot.getLegendItems();
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72 // Find "similar" entries if aggregation is enabled.
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73
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74 int maxListSize = 0;
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75 int AGGR_THRESHOLD = threshold;
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76
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77 if (AGGR_THRESHOLD > old.getItemCount() || AGGR_THRESHOLD <= 0){
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78 return;
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79 }
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80
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81 HashMap<String, List<LegendItem>> entries = new LinkedHashMap<String, List<LegendItem>>();
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82 for (Iterator<LegendItem> i = old.iterator(); i.hasNext();) {
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83 LegendItem item = i.next();
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84 String hash = legendItemHash(item);
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85 List<LegendItem> itemList = entries.get(hash);
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86 if (itemList == null) {
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87 itemList = new ArrayList<LegendItem>();
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88 entries.put(hash, itemList);
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89 }
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90 itemList.add(item);
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91
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92 if (itemList.size() > maxListSize) {
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93 maxListSize = itemList.size();
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94 }
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95 }
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96
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97 if (maxListSize < AGGR_THRESHOLD) {
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98 // No need to do anything.
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99 return;
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100 }
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101
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102 // Run over collected entries, merge their names and create new
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103 // entry if needed.
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104 LegendItemCollection newLegend = new LegendItemCollection();
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105 for (List<LegendItem> itemList: entries.values()) {
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106 if (itemList.size() >= AGGR_THRESHOLD) {
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107 // Now do merging.
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108 // XXX: DEAD CODE // LegendItem item = itemList.get(0);
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109 // Unfortunately we cannot clone and just setDescription, as this
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110 // method was added in JFreeChart 1.0.14 (we are at .13).
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111
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112 // Remove the shapes of all but the first items,
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113 // to prevent "overfill" of legenditemblock.
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114 for (int i = 0; i < itemList.size(); i++) {
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115 if (i != 0) {
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116 LegendItem litem = itemList.get(i);
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117
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118 // Make shape and line really small.
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119 LegendItem merged = new LegendItem(
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120 "," + litem.getLabel(), litem.getDescription(), litem.getToolTipText(),
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121 litem.getURLText(), false, SPACE,
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122 false, litem.getFillPaint(), false,
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123 litem.getOutlinePaint(), litem.getOutlineStroke(), false,
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124 SPACE, litem.getLineStroke(), litem.getLinePaint());
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125 newLegend.add(merged);
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126 }
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127 else {
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128 newLegend.add(itemList.get(i));
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129 }
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130 }
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131 }
05c84d65988a Extracted legenditemaggregation from xychartgenerator.
Felix Wolfsteller <felix.wolfsteller@intevation.de>
parents:
diff changeset
132 else {
05c84d65988a Extracted legenditemaggregation from xychartgenerator.
Felix Wolfsteller <felix.wolfsteller@intevation.de>
parents:
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133 // Do not merge entries.
05c84d65988a Extracted legenditemaggregation from xychartgenerator.
Felix Wolfsteller <felix.wolfsteller@intevation.de>
parents:
diff changeset
134 for (LegendItem li: itemList) {
05c84d65988a Extracted legenditemaggregation from xychartgenerator.
Felix Wolfsteller <felix.wolfsteller@intevation.de>
parents:
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135 newLegend.add(li);
05c84d65988a Extracted legenditemaggregation from xychartgenerator.
Felix Wolfsteller <felix.wolfsteller@intevation.de>
parents:
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136 }
05c84d65988a Extracted legenditemaggregation from xychartgenerator.
Felix Wolfsteller <felix.wolfsteller@intevation.de>
parents:
diff changeset
137 }
05c84d65988a Extracted legenditemaggregation from xychartgenerator.
Felix Wolfsteller <felix.wolfsteller@intevation.de>
parents:
diff changeset
138 }
05c84d65988a Extracted legenditemaggregation from xychartgenerator.
Felix Wolfsteller <felix.wolfsteller@intevation.de>
parents:
diff changeset
139
05c84d65988a Extracted legenditemaggregation from xychartgenerator.
Felix Wolfsteller <felix.wolfsteller@intevation.de>
parents:
diff changeset
140 plot.setFixedLegendItems (newLegend);
05c84d65988a Extracted legenditemaggregation from xychartgenerator.
Felix Wolfsteller <felix.wolfsteller@intevation.de>
parents:
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141 }
05c84d65988a Extracted legenditemaggregation from xychartgenerator.
Felix Wolfsteller <felix.wolfsteller@intevation.de>
parents:
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142 }
05c84d65988a Extracted legenditemaggregation from xychartgenerator.
Felix Wolfsteller <felix.wolfsteller@intevation.de>
parents:
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143 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 :
http://dive4elements.wald.intevation.org