Mercurial > dive4elements > gnv-client

annotate gnv-artifacts/src/main/java/de/intevation/gnv/jfreechart/CompactXYItems.java @ 1138:2c00570ab3bd

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merged doc
author Thomas Arendsen Hein <thomas@intevation.de>
date Fri, 28 Sep 2012 12:14:02 +0200
parents f953c9a559d8
children
rev   line source
1115
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1 /*
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2 * Copyright (c) 2010 by Intevation GmbH
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3 *
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4 * This program is free software under the LGPL (>=v2.1)
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5 * Read the file LGPL.txt coming with the software for details
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6 * or visit http://www.gnu.org/licenses/ if it does not exist.
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7 */
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8
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9 package de.intevation.gnv.jfreechart;
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10
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11 import java.io.Serializable;
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12
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13 /**
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14 * This class is used to represent geometries (e.g. point, line, polygon). Each
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15 * geometry is made up of multiple xy points stored in a single array. A line
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16 * composed by start- and endpoint is stored in the following order in that
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17 * array: [x1, y1, x2, y2].
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18 *
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19 * @author <a href="mailto:sascha.teichmann@intevation.de">Sascha Teichmann</a>
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20 * @author <a href="mailto:ingo.weinzierl@intevation.de">Ingo Weinzierl</a>
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21 */
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22 public class CompactXYItems
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23 implements Serializable
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24 {
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25 /**
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26 * Array storing the xy items.
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27 */
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28 protected double [] data;
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29
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30 /**
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31 * Constructs a new CompactXYItems object with the given data.
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32 *
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33 * @param data An array with xy values.
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34 */
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35 public CompactXYItems(double [] data) {
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36 this.data = data;
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37 }
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38
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39 /**
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40 * Retrieves the x coordinate of the point with the given index.
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41 *
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42 * @param index Index
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43 * @return X coordinate.
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44 */
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45 public double getX(int index) {
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46 return data[index << 1];
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47 }
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48
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49 /**
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50 * Retrieves the y coordinate of the point with the given index.
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51 *
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52 * @param index Index
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53 * @return Y coordinate.
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54 */
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55 public double getY(int index) {
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56 return data[(index << 1)+1];
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57 }
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58
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59 /**
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60 * Write the tupel of xy-values at a specific index into the given array.
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61 *
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62 * @param index Index used to specify the xy-value.
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63 * @param xy the xy coordinate is written into this array with the following
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64 * order: [x,y]
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65 */
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66 public void get(int index, double [] xy) {
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67 xy[0] = data[index = (index << 1) + 1];
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68 xy[1] = data[index + 1];
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69 }
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70
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71 /**
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72 *
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73 * @return the data array.
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74 */
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75 public double [] getData() {
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76 return data;
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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 data
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82 */
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83 public void setData(double [] data) {
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84 this.data = data;
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85 }
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86
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87 /**
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88 *
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89 * @return the number of data points.
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90 */
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91 public int size() {
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92 return data.length >> 1;
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93 }
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94
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95 /**
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96 * Retrieves the bounding box spaned by the coordinates in the data array.
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97 *
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98 * @param bbox
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99 * @return the calculated bounding box.
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100 */
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101 public double [] calculateBoundingBox(double [] bbox) {
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102 for (int i = 0; i < data.length;) {
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103 double x = data[i++];
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104 double y = data[i++];
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105 if (x < bbox[0]) bbox[0] = x;
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106 if (y < bbox[1]) bbox[1] = y;
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107 if (x > bbox[2]) bbox[2] = x;
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108 if (y > bbox[3]) bbox[3] = y;
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109 }
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110 return bbox;
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111 }
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112
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113 /**
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114 *
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115 * @return the coordinates as string.
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116 */
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117 @Override
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118 public String toString() {
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119 StringBuilder sb = new StringBuilder();
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120 for (int i = 0; i < data.length;) {
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121 if (i > 0) sb.append("; ");
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122 sb.append('(');
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123 sb.append(data[i++]);
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124 sb.append(", ");
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125 sb.append(data[i++]);
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126 sb.append(')');
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127 }
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128 return sb.toString();
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129 }
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130
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131
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132 /**
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133 *
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134 * @return the lowest x value.
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135 */
422
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136 public double getMinX() {
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137 double lower = Double.POSITIVE_INFINITY;
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138
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139 for (int i = 0; i < data.length; i += 2) {
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140 double x = data[i];
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141
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142 if (!Double.isNaN(x)) {
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143 lower = Math.min(lower, x);
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144 }
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145 }
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146
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147 return lower;
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148 }
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149
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150
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151 /**
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152 *
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153 * @return the highest x value.
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154 */
422
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155 public double getMaxX() {
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156 double upper = Double.NEGATIVE_INFINITY;
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157
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158 for (int i = 0; i < data.length; i += 2) {
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159 double x = data[i];
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160
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161 if (!Double.isNaN(x)) {
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162 upper = Math.max(upper, x);
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163 }
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164 }
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165
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166 return upper;
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167 }
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168
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169
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170 /**
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171 *
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172 * @return the lowest y value.
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173 */
422
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174 public double getMinY() {
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175 double lower = Double.POSITIVE_INFINITY;
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176
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177 for (int i = 1; i < data.length; i += 2) {
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178 double y = data[i];
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179
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180 if (!Double.isNaN(y)) {
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181 lower = Math.min(lower, y);
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182 }
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183 }
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184
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185 return lower;
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186 }
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187
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188
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189 /**
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190 *
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191 * @return the highest y value.
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192 */
422
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193 public double getMaxY() {
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194 double upper = Double.NEGATIVE_INFINITY;
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195
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196 for (int i = 1; i < data.length; i += 2) {
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197 double y = data[i];
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198
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199 if (!Double.isNaN(y)) {
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200 upper = Math.max(upper, y);
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201 }
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202 }
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203
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204 return upper;
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205 }
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206 }
836
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207 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf-8 :
http://dive4elements.wald.intevation.org