Mercurial > dive4elements > gnv-client

annotate gnv-artifacts/src/main/java/de/intevation/gnv/jfreechart/PolygonRenderer.java @ 814:9d427dd2a96a

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Added Javadoc in statistic package. gnv-artifacts/trunk@898 c6561f87-3c4e-4783-a992-168aeb5c3f6f
author Ingo Weinzierl <ingo.weinzierl@intevation.de>
date Fri, 09 Apr 2010 14:34:45 +0000
parents feae2f9d6c6f
children 22c18083225e
rev   line source
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1 package de.intevation.gnv.jfreechart;
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2
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3 import java.awt.BasicStroke;
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4 import java.awt.Color;
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5 import java.awt.Font;
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6 import java.awt.FontMetrics;
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7 import java.awt.Graphics2D;
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8 import java.awt.Paint;
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9 import java.awt.Shape;
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10
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11 import java.awt.geom.GeneralPath;
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13 import java.awt.geom.Rectangle2D.Double;
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15 import java.awt.geom.Rectangle2D;
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17 import java.util.ArrayList;
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18
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19 import org.apache.log4j.Logger;
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21 import org.jfree.chart.axis.ValueAxis;
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22
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23 import org.jfree.data.Range;
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24
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25 import org.jfree.text.TextUtilities;
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26
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27 import org.jfree.ui.RectangleEdge;
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28
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29 /**
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30 * This renderer is used to draw polygons into a Graphics object.
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31 *
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32 * @author <a href="mailto:ingo.weinzierl@intevation.de">Ingo Weinzierl</a>
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33 * @author <a href="mailto:sascha.teichmann@intevation.de">Sascha L. Teichmann</a>
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34 */
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35 public class PolygonRenderer
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36 {
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37 private static Logger log = Logger.getLogger(
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38 PolygonRenderer.class);
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39
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40 /**
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41 * This interfaces describes a single method to retrieve a Paint object
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42 * for a given index.
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43 */
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44 public interface PaintLookup {
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45
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46 /**
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47 *
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48 * @param index Index.
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49 * @return Paint
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50 */
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51 Paint getPaint(int index);
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52
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53 } // interface PaintLookup
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54
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55 /**
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56 * This class is used to generate labels for a given series.
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57 */
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58 public static class DefaultLabelGenerator
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59 implements PolygonSeriesLabelGenerator
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60 {
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61 /**
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62 * Construts an empty DefaultLabelGenerator.
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63 */
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64 public DefaultLabelGenerator() {
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65 }
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66
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67 /**
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68 *
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69 * @param series A PolygonSeries.
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70 * @return The label of series.
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71 */
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72 public String generateLabel(PolygonSeries series) {
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73 Object label = series.getAttribute("label");
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74 return label != null
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75 ? toString(label)
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76 : null;
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77 }
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78
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79 /**
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80 *
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81 * @param label Object
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82 * @return String representaton of label.
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83 */
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84 protected String toString(Object label) {
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85 return label.toString();
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86 }
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87 } // class DefaultLabelGenerator
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88
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89 /**
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90 * Constructor.
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91 */
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92 public static final PolygonSeriesLabelGenerator
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93 DEFAULT_LABEL_GENERATOR_INSTANCE = new DefaultLabelGenerator();
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94
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95 /**
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96 *
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97 */
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98 protected PaintLookup lookup;
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99 /**
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100 *
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101 */
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102 protected PolygonSeriesLabelGenerator labelGenerator;
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103
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104 /**
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105 *
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106 * @param lookup
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107 */
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108 public PolygonRenderer(PaintLookup lookup) {
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109 this(lookup, null);
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110 }
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111
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112 /**
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113 *
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114 * @param lookup
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115 * @param labelGenerator
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116 */
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117 public PolygonRenderer(
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118 PaintLookup lookup,
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119 PolygonSeriesLabelGenerator labelGenerator
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120 ) {
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121 this.lookup = lookup;
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122 this.labelGenerator = labelGenerator;
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123 }
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124
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125 /**
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126 * This method draws polygons of each series in <code>dataset</code> into
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127 * the given graphics object. If a polygon has no attribute 'fill', we
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128 * expect that it is a line, otherwise the polygon is filled.
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129 *
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130 * @param graphics
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131 * @param plot
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132 * @param area
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133 * @param dataset
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134 */
450
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135 public void drawPolygons(
422
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136 Graphics2D graphics,
451
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137 PolygonPlot plot,
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138 Rectangle2D area,
422
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139 PolygonDataset dataset
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140 ) {
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141 int seriesCount = dataset.getSeriesCount();
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142 for (int i = 0; i < seriesCount; i++) {
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143 PolygonSeries series = dataset.getSeries(i);
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144 Integer colorIdx = (Integer)series.getAttribute("fill");
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145
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146 if (colorIdx != null) {
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147 Paint paint = lookup.getPaint(colorIdx.intValue());
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148 graphics.setPaint(paint != null ? paint : Color.black);
451
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149 graphics.fill(constructShape(plot, area, series, true));
422
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150 }
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151 else {
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152 Number lineWidth = (Number)series.getAttribute("line.width");
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153 BasicStroke stroke = new BasicStroke(
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154 lineWidth != null ? lineWidth.floatValue() : 1f);
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155 graphics.setStroke(stroke);
422
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156 graphics.setPaint(Color.black);
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157 graphics.draw(constructShape(plot, area, series, false));
422
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158 }
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159 }
450
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160 }
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161
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162 /**
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163 * Draw labels at each item of a series in the given dataset. If the series
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164 * has no label attritue, no label is drawn.
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165 *
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166 * @param graphics
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167 * @param plot
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168 * @param area
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169 * @param dataset
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170 */
450
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171 public void drawLabels(
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172 final Graphics2D graphics,
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173 final PolygonPlot plot,
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174 final Rectangle2D area,
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175 PolygonDataset dataset
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176 ) {
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177 if (labelGenerator == null) {
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178 return;
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179 }
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180
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181 final ArrayList<Rectangle2D> bboxes = new ArrayList<Rectangle2D>();
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182
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183 Font font = graphics.getFont();
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184 font = font.deriveFont(Font.PLAIN, Math.max(8, font.getSize()-3));
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185 graphics.setFont(font);
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186 FontMetrics metrics = graphics.getFontMetrics(font);
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187
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188 for (int i = dataset.getSeriesCount()-1; i >= 0; --i) {
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189 PolygonSeries series = dataset.getSeries(i);
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190
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191 String label = labelGenerator.generateLabel(series);
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192 if (label == null) {
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193 continue;
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194 }
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195
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196 final Rectangle2D box = TextUtilities.getTextBounds(
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197 label, graphics, metrics);
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198
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199 for (int j = series.getItemCount()-1; j >= 0; --j) {
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200 final CompactXYItems ring = series.getItem(j);
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201 LevelOrderIndices loi = new LevelOrderIndices(ring.size()-1);
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202 Rectangle2D r = (Rectangle2D)loi.visit(
778
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203 new LevelOrderIndices.Visitor()
450
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204 {
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205 ValueAxis da = plot.getDomainAxis();
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206 ValueAxis ra = plot.getRangeAxis();
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207 RectangleEdge de = plot.getDomainAxisEdge();
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208 RectangleEdge re = plot.getRangeAxisEdge();
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209 Rectangle2D.Double r = new Rectangle2D.Double(
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diff changeset
210 0d, 0d, box.getWidth(), box.getHeight());
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diff changeset
211
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diff changeset
212 public Object visit(int index) {
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213 r.x = da.valueToJava2D(ring.getX(index), area, de)
450
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214 - 0.5*box.getWidth();
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diff changeset
215 r.y = ra.valueToJava2D(ring.getY(index), area, re)
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216 + 0.5*box.getHeight();
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parents: 447
diff changeset
217
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218 for (Rectangle2D b: bboxes) {
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diff changeset
219 if (b.intersects(r)) {
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diff changeset
220 return null;
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diff changeset
221 }
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diff changeset
222 }
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parents: 447
diff changeset
223 return r;
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parents: 447
diff changeset
224 }
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parents: 447
diff changeset
225 });
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diff changeset
226
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diff changeset
227 if (r != null) {
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diff changeset
228 bboxes.add(r);
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diff changeset
229 graphics.drawString(
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diff changeset
230 label, (float)r.getX(), (float)r.getY());
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diff changeset
231 }
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232 } // for all items in series
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233 } // for all series
422
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parents:
diff changeset
234 }
f426f55d4f7a Added Ingo Weinzierl's special JFreeChart classes.
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parents:
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235
795
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parents: 780
diff changeset
236 /**
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parents: 780
diff changeset
237 * Creates a shape made up of the CompactXYItems object stored in the given
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Ingo Weinzierl <ingo.weinzierl@intevation.de>
parents: 780
diff changeset
238 * series.
cdade5005cba Added javadoc in jfreechart package.
Ingo Weinzierl <ingo.weinzierl@intevation.de>
parents: 780
diff changeset
239 *
cdade5005cba Added javadoc in jfreechart package.
Ingo Weinzierl <ingo.weinzierl@intevation.de>
parents: 780
diff changeset
240 * @param plot The plot.
cdade5005cba Added javadoc in jfreechart package.
Ingo Weinzierl <ingo.weinzierl@intevation.de>
parents: 780
diff changeset
241 * @param area The boundary.
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Ingo Weinzierl <ingo.weinzierl@intevation.de>
parents: 780
diff changeset
242 * @param series The series storing the items.
cdade5005cba Added javadoc in jfreechart package.
Ingo Weinzierl <ingo.weinzierl@intevation.de>
parents: 780
diff changeset
243 * @param close Specifies if the polygon should be closed or not.
cdade5005cba Added javadoc in jfreechart package.
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parents: 780
diff changeset
244 * @return
cdade5005cba Added javadoc in jfreechart package.
Ingo Weinzierl <ingo.weinzierl@intevation.de>
parents: 780
diff changeset
245 */
451
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parents: 450
diff changeset
246 protected Shape constructShape(
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parents: 450
diff changeset
247 PolygonPlot plot,
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parents: 450
diff changeset
248 Rectangle2D area,
778
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parents: 451
diff changeset
249 PolygonSeries series,
451
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parents: 450
diff changeset
250 boolean close
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parents: 450
diff changeset
251 ) {
bc5901bb4525 Use JFreeCharts ValueAxis.valueToJava2D() to transform data values
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parents: 450
diff changeset
252 ValueAxis da = plot.getDomainAxis();
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parents: 450
diff changeset
253 ValueAxis ra = plot.getRangeAxis();
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parents: 450
diff changeset
254 RectangleEdge de = plot.getDomainAxisEdge();
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parents: 450
diff changeset
255 RectangleEdge re = plot.getRangeAxisEdge();
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parents: 450
diff changeset
256
422
f426f55d4f7a Added Ingo Weinzierl's special JFreeChart classes.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
257 CompactXYItems [] rings = series.getRings();
451
bc5901bb4525 Use JFreeCharts ValueAxis.valueToJava2D() to transform data values
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258 GeneralPath path = new GeneralPath();
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259
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260 for (int i = 0; i < rings.length; ++i) {
451
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261
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262 CompactXYItems ring = rings[i];
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263
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264 double [] data = ring.getData();
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265
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266 if (data.length >= 2) {
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267 path.moveTo(
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268 (float)da.valueToJava2D(data[0], area, de),
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269 (float)ra.valueToJava2D(data[1], area, re));
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270 }
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271 for (int j = 2; j < data.length;) {
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272 path.lineTo(
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273 (float)da.valueToJava2D(data[j++], area, de),
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274 (float)ra.valueToJava2D(data[j++], area, re));
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275 }
437
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276 if (close) {
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277 path.closePath();
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278 }
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279 }
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280 return path;
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281 }
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282
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283 /**
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284 * Retrieves the bounding box of a dataset.
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285 *
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286 * @param dataset
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287 * @return
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288 */
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289 public Rectangle2D getBoundingBox(PolygonDataset dataset) {
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290 Rectangle2D bbox = null;
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291
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292 for (int i = 0, N = dataset.getSeriesCount(); i < N; i++) {
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293 Range domain = dataset.getSeries(i).getDomainBounds();
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294 Range range = dataset.getSeries(i).getRangeBounds();
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295
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296 double x = domain.getLowerBound();
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297 double y = range.getLowerBound();
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298 double w = Math.abs(domain.getUpperBound() - x);
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299 double h = Math.abs(range.getUpperBound() - y);
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300
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301 if (bbox == null) {
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302 bbox = new Rectangle2D.Double(x, y, w, h);
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303 }
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304 else {
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305 bbox.add(new Rectangle2D.Double(x, y, w, h));
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306 }
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307 }
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308
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309 return bbox;
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310 }
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311
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312 /**
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313 *
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314 * @param series
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315 * @return the bounds of a series.
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316 */
422
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317 public Rectangle2D getBounds(PolygonSeries series) {
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318
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319 Range domain = series.getDomainBounds();
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320 Range range = series.getRangeBounds();
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321
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322 return new Rectangle2D.Double(
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323 domain.getLowerBound(), range.getLowerBound(),
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324 domain.getUpperBound(), range.getUpperBound()
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325 );
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326 }
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327 }
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328 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf-8 :
http://dive4elements.wald.intevation.org