Mercurial > dive4elements > river

annotate artifacts/src/main/java/org/dive4elements/river/exports/LegendAggregator.java @ 9555:ef5754ba5573

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Implemented legend aggregation based on type of themes. Added theme-editor style configuration for aggregated legend entries. Only configured themes get aggregated.
author gernotbelger
date Tue, 23 Oct 2018 16:26:48 +0200
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children f8308db94634
rev   line source
9555
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1 /** Copyright (C) 2017 by Bundesanstalt für Gewässerkunde
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2 * Software engineering by
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3 * Björnsen Beratende Ingenieure GmbH
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4 * Dr. Schumacher Ingenieurbüro für Wasser und Umwelt
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5 *
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6 * This file is Free Software under the GNU AGPL (>=v3)
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7 * and comes with ABSOLUTELY NO WARRANTY! Check out the
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8 * documentation coming with Dive4Elements River for details.
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9 */
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10 package org.dive4elements.river.exports;
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11
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12 import java.awt.Font;
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13 import java.awt.Paint;
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14 import java.awt.Shape;
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15 import java.awt.Stroke;
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16 import java.util.AbstractMap.SimpleEntry;
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17 import java.util.ArrayList;
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18 import java.util.HashMap;
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19 import java.util.HashSet;
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20 import java.util.IdentityHashMap;
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21 import java.util.Iterator;
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22 import java.util.List;
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23 import java.util.Map;
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24 import java.util.Map.Entry;
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25 import java.util.Set;
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26
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27 import org.dive4elements.artifacts.CallContext;
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28 import org.dive4elements.river.artifacts.context.RiverContext;
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29 import org.dive4elements.river.artifacts.resources.Resources;
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30 import org.dive4elements.river.jfree.StyledSeries;
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31 import org.dive4elements.river.jfree.StyledXYDataset;
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32 import org.dive4elements.river.themes.Theme;
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33 import org.dive4elements.river.themes.ThemeDocument;
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34 import org.dive4elements.river.themes.ThemeFactory;
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35 import org.jfree.chart.LegendItem;
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36 import org.jfree.chart.LegendItemCollection;
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37 import org.jfree.chart.plot.XYPlot;
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38 import org.jfree.data.general.Dataset;
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39 import org.jfree.data.xy.XYSeries;
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40 import org.jfree.data.xy.XYSeriesCollection;
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41 import org.w3c.dom.Document;
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42
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43 /**
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44 * Builds and adds legend entries to the plot.
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45 *
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46 * @author Gernot Belger
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47 */
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48 public class LegendAggregator {
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49
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50 private static final String NULL_THEME_TYPE = ""; //$NON-NLS-1$
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51
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52 private static final String I10N_MERGED = "legend.aggregator.merged"; //$NON-NLS-1$
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53
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54 private final List<Map.Entry<LegendItem, String>> legendItems = new ArrayList<>();
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55
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56 private final Map<String, List<LegendItem>> itemsPerThemeType = new HashMap<>();
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57
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58 private final Font labelFont;
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59
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60 private final int aggregationThreshold;
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61
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62 public LegendAggregator(final int aggregationThreshold, final Font labelFont) {
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63 this.aggregationThreshold = aggregationThreshold;
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64 this.labelFont = labelFont;
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65 }
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66
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67 public void addLegendItem(final String themeType, final LegendItem item) {
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68
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69 item.setLabelFont(this.labelFont);
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70
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71 this.legendItems.add(new SimpleEntry<>(item, themeType));
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72
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73 final List<LegendItem> perThemeType = getItemsPerThemeType(themeType);
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74 perThemeType.add(item);
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75 }
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76
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77 private List<LegendItem> getItemsPerThemeType(final String themeType) {
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78
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79 final String key = themeType == null ? NULL_THEME_TYPE : themeType;
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80
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81 if (!this.itemsPerThemeType.containsKey(key))
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82 this.itemsPerThemeType.put(key, new ArrayList<LegendItem>());
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83
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84 return this.itemsPerThemeType.get(key);
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85 }
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86
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87 /**
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88 * Apply the gathered items to the plot. Use only once.
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89 */
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90 public void apply(final CallContext context, final XYPlot plot) {
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91
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92 final LegendItemCollection aggregatedItems = new LegendItemCollection();
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93
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94 /* marker set for types that are already aggregated */
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95 final Set<String> aggregatedTypes = new HashSet<>();
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96
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97 for (final Entry<LegendItem, String> entry : this.legendItems) {
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98
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99 final LegendItem item = entry.getKey();
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100 final String themeType = entry.getValue();
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101
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102 /* ignore already aggregated items */
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103 if (aggregatedTypes.contains(themeType))
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104 continue;
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105
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106 /* aggregate known types if count over threshold */
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107 final Theme legendTheme = getLegendTheme(context, themeType);
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108
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109 if (legendTheme != null && getItemsPerThemeType(themeType).size() > this.aggregationThreshold) {
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110
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111 final String labelDescription = Resources.getMsg(context.getMeta(), legendTheme.getDescription());
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112 final String labelMerged = Resources.getMsg(context.getMeta(), I10N_MERGED);
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113 final String label = String.format("%s (%s)", labelDescription, labelMerged);
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114
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115 final List<LegendItem> items = findDistinctItems(getItemsPerThemeType(themeType));
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116 /* add items for each distinct shape, only the last one gets the label */
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117 for (final Iterator<LegendItem> iterator = items.iterator(); iterator.hasNext();) {
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118
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119 final LegendItem legendItem = iterator.next();
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120 final String itemLabel = iterator.hasNext() ? "," : label;
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121
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122 /* create and add aggregated item(s) */
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123 final LegendItem aggregatedItem = createAggregatedItem(legendItem, legendTheme, itemLabel);
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124 aggregatedItems.add(aggregatedItem);
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125 }
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126
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127 /* mark as handles */
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128 aggregatedTypes.add(themeType);
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129
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130 } else {
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131 /* simply add normal items */
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132 aggregatedItems.add(item);
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133 }
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134 }
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135
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136 plot.setFixedLegendItems(aggregatedItems);
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137
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138 this.itemsPerThemeType.clear();
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139 this.legendItems.clear();
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140 }
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141
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142 /**
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143 * Extract distinct items, curently only those that are different regarding their shape
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144 */
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145 private List<LegendItem> findDistinctItems(final List<LegendItem> items) {
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146
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147 // HACKY: we hash by unique shape, because we know that the used shapes are cashed in a static cache.
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148 final Map<Shape, LegendItem> shapeMap = new IdentityHashMap<>();
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149
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150 for (final LegendItem item : items) {
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151
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152 final Shape shape = item.isShapeVisible() ? item.getShape() : null;
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153 if (!shapeMap.containsKey(shape))
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154 shapeMap.put(shape, item);
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155 }
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156
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157 return new ArrayList<>(shapeMap.values());
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158 }
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159
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160 private LegendItem createAggregatedItem(final LegendItem item, final Theme legendTheme, final String label) {
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161 /* clone properties from current item */
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162 final String description = item.getDescription();
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163 final String tooltipText = item.getToolTipText();
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164 final String urlText = item.getURLText();
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165 final boolean shapeVisible = item.isShapeVisible();
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166 final Shape shape = item.getShape();
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167 final boolean shapeFilled = item.isShapeFilled();
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168 final Paint fillPaint = item.getFillPaint();
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169 final boolean shapeOutlineVisible = item.isShapeOutlineVisible();
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170 final Paint outlinePaint = item.getOutlinePaint();
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171 final Stroke outlineStroke = item.getOutlineStroke();
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172 final boolean lineVisible = item.isLineVisible();
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173 final Shape line = item.getLine();
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174 final Stroke lineStroke = item.getLineStroke();
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175 final Paint linePaint = item.getLinePaint();
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176 final LegendItem aggregatedItem = new LegendItem(label, description, tooltipText, urlText, shapeVisible, shape, shapeFilled, fillPaint,
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177 shapeOutlineVisible, outlinePaint, outlineStroke, lineVisible, line, lineStroke, linePaint);
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178
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179 aggregatedItem.setDataset(item.getDataset());
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180 aggregatedItem.setDatasetIndex(item.getDatasetIndex());
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181 aggregatedItem.setFillPaintTransformer(item.getFillPaintTransformer());
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182 aggregatedItem.setLabelFont(item.getLabelFont());
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183 aggregatedItem.setLabelPaint(item.getLabelPaint());
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184 aggregatedItem.setSeriesIndex(item.getSeriesIndex());
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185
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186 /* let styled dataset apply specific theme configuration */
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187 applyThemeToLegend(aggregatedItem, legendTheme);
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188
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189 return aggregatedItem;
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190 }
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191
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192 private void applyThemeToLegend(final LegendItem item, final Theme legendTheme) {
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193
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194 final Dataset dataset = item.getDataset();
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195 if (dataset == null)
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196 return;
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197
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198 final Document xml = legendTheme.toXML();
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199 final ThemeDocument themeDocument = new ThemeDocument(xml);
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200
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201 if (dataset instanceof StyledXYDataset) {
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202 final StyledXYDataset styledDataset = (StyledXYDataset) dataset;
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203 styledDataset.applyAggregatedLegendTheme(item, themeDocument);
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204 return;
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205 }
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206
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207 if (dataset instanceof XYSeriesCollection) {
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208
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209 final int seriesIndex = item.getSeriesIndex();
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210
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211 final XYSeriesCollection seriesCollection = (XYSeriesCollection) dataset;
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212 if (seriesIndex >= 0 && seriesIndex < seriesCollection.getSeriesCount()) {
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213 final XYSeries series = seriesCollection.getSeries(seriesIndex);
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214
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215 if (series instanceof StyledSeries) {
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216 ((StyledSeries) series).applyAggregatedLegendTheme(item, themeDocument);
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217 }
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218 }
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219 }
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220 }
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221
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222 private Theme getLegendTheme(final CallContext context, final String themeType) {
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223
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224 final RiverContext flysContext = context instanceof RiverContext ? (RiverContext) context : (RiverContext) context.globalContext();
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225
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226 return ThemeFactory.getLegendTheme(flysContext, themeType);
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227 }
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228 }
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