Mercurial > dive4elements > river

annotate flys-artifacts/src/main/java/de/intevation/flys/exports/LegendProcessor.java @ 4282:8b4988815974

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Added marker for Ws and Qs in Historical Discharge WQ charts. Therefore, the XYChartGenerator got two new methods addDomainMarker(Marker, boolean) and addValueMarker(Marker, boolean). The boolean parameters determine, if the marker should be visible or not. This is analogous to addAxisSeries(XYSeries, int, boolean).
author Ingo Weinzierl <ingo.weinzierl@intevation.de>
date Mon, 29 Oct 2012 05:59:27 +0100
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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075f1ba25758 issue654
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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 }
05c84d65988a Extracted legenditemaggregation from xychartgenerator.
Felix Wolfsteller <felix.wolfsteller@intevation.de>
parents:
diff changeset
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:
diff changeset
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:
diff changeset
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:
diff changeset
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