annotate gnv-artifacts/src/main/java/de/intevation/gnv/raster/Palette.java @ 1115:f953c9a559d8

Added license file and license headers. gnv-artifacts/trunk@1260 c6561f87-3c4e-4783-a992-168aeb5c3f6f
author Ingo Weinzierl <ingo.weinzierl@intevation.de>
date Tue, 02 Nov 2010 17:46:55 +0000
parents feae2f9d6c6f
children
rev   line source
1115
f953c9a559d8 Added license file and license headers.
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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.raster;
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10
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11 import de.intevation.gnv.raster.Raster.ValueToIndex;
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12
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13 import java.awt.Color;
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14
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15 import java.util.Arrays;
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16
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17 import org.apache.log4j.Logger;
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18
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19 import org.w3c.dom.Document;
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20 import org.w3c.dom.Element;
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21 import org.w3c.dom.NodeList;
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22
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23 /**
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24 * Lookup mechanism to map double values from a list of
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25 * ranges onto a set of colors and vice versa.
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26 * @author <a href="mailto:sascha.teichmann@intevation.de">Sascha L. Teichmann</a>
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27 */
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28 public class Palette
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29 implements ValueToIndex
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30 {
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31 private static Logger log = Logger.getLogger(Palette.class);
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32
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33 /**
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34 * An entry in the lookup table.
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35 */
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36 public static final class Entry
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37 implements Comparable
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38 {
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39 private Entry left;
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40 private Entry right;
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41
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42 private int index;
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43
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44 private int externalIndex;
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45
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46 private double from;
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47 private double to;
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48
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49 private String description;
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50
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51 private Color color;
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52
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53 /**
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54 * Default constructor
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55 */
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56 public Entry() {
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57 }
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58
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59 /**
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60 * Copy constructor
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61 * @param other The entry to copy.
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62 */
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63 public Entry(Entry other) {
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64 index = other.index;
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65 externalIndex = other.externalIndex;
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66 from = other.from;
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67 to = other.to;
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68 description = other.description;
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69 color = other.color;
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70 }
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71
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72 /**
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73 * Constructor to set the palette index, the exteral index,
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74 * the value range, the color and the description.
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75 * @param index The pallette index
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76 * @param externalIndex The external index
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77 * @param from Start of the interval
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78 * @param to End of the interval
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79 * @param color The color belonging to this interval.
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80 * @param description The description of this range.
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81 */
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82 public Entry(
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83 int index,
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84 int externalIndex,
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85 double from,
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86 double to,
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87 Color color,
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88 String description
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89 ) {
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90 this.index = index;
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91 this.externalIndex = externalIndex;
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92 this.from = from;
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93 this.to = to;
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94 this.color = color;
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95 this.description = description;
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96 }
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97
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98 /**
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99 * Compares two entries by the start point of the interval.
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100 * @param other
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101 * @return -1 if this start point is before other. +1 if this
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102 * start point is after, else 0.
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103 */
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104 public int compareTo(Object other) {
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105 Entry e = (Entry)other;
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106 if (from < e.from) return -1;
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107 if (from > e.from) return +1;
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108 return 0;
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109 }
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110
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111 /**
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112 * The starting point of the interval.
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113 * @return The starting point.
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114 */
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115 public double getFrom() {
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116 return from;
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117 }
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118
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119 /**
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120 * The end point of the interval.
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121 * @return The end point.
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122 */
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123 public double getTo() {
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124 return to;
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125 }
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126
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127 /**
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128 * The color of the entry.
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129 * @return The color.
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130 */
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131 public Color getColor() {
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132 return color;
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133 }
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134
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135 /**
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136 * The external index of this entry. Useful to model
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137 * external joins.
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138 * @return The external index.
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139 */
483
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140 public int getExternalIndex() {
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141 return externalIndex;
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142 }
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143
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144 /**
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145 * Searches for an entry which has a range that contains
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146 * the given value.
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147 * @param value The value to be searched.
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148 * @return The entry containing the value or null if no such
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149 * entry exists.
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150 */
424
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151 public Entry locateEntry(double value) {
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152 Entry current = this;
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153 while (current != null) {
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154 boolean b = value >= current.from;
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155 if (b && value <= current.to) {
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156 return current;
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157 }
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158 current = b
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159 ? current.right
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160 : current.left;
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161 }
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162 return null;
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163 }
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164
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165 /**
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166 * Returns the palette index for a given value.
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167 * @param value The value to search.
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168 * @return The index of the palette entry or -1 if
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169 * no such entry exists.
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170 */
424
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171 public int locate(double value) {
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172 Entry entry = locateEntry(value);
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173 return entry != null
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174 ? entry.index
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175 : -1;
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176 }
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177
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178 /**
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179 * Searches for an interval with a given index.
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180 * @param index The index to be searched.
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181 * @return The entry with the given index or null if no
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182 * such entry exists.
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183 */
424
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184 public Entry findByIndex(int index) {
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185 Entry current = this;
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186 while (current != null) {
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187 if (current.index == index) {
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188 break;
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189 }
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190 current = index < current.index
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191 ? current.left
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192 : current.right;
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193 }
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194 return current;
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195 }
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196
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197 /**
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198 * The description of this entry.
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199 * @return The description.
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200 */
424
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201 public String getDescription() {
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202 return description;
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203 }
435
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204
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205 /**
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206 * Determines if the range of this entry has
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207 * infinitive length.
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208 * @return true if the range of this entry has infinitive
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209 * length else false.
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210 */
435
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211 public boolean isInfinity() {
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212 return from == -Double.MAX_VALUE
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213 || to == Double.MAX_VALUE;
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214 }
424
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215 } // class Entry
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216
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217 /**
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218 * Internal table of the entrys.
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219 */
424
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220 protected Entry [] entries;
803
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221
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222 /**
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223 * Root of the entry tree used to map values to entries.
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224 */
424
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225 protected Entry lookup;
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226
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227 /**
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228 * The list of colors used by this palette.
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229 */
424
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230 protected Color [] rgbs;
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231
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232 private Entry buildLookup(Entry [] entries, int lo, int hi) {
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233 if (lo > hi) {
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234 return null;
21fbd254db71 Added support for converting 2D rasters into polygons.
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235 }
21fbd254db71 Added support for converting 2D rasters into polygons.
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236 int mid = (lo + hi)/2;
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237 Entry entry = entries[mid];
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238 entry.left = buildLookup(entries, lo, mid-1);
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239 entry.right = buildLookup(entries, mid+1, hi);
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240 return entry;
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241 }
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242
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243 /**
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244 * Default constructor.
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245 */
424
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246 public Palette() {
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247 }
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248
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249 /**
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250 * Constructor to create the palette from an XML document.
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251 * @param document The document with palette information.
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252 */
424
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253 public Palette(Document document) {
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254
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255 NodeList rangeNodes = document.getElementsByTagName("range");
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256
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257 entries = new Entry[rangeNodes.getLength()];
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258 rgbs = new Color[entries.length];
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259
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260 for (int i = 0; i < entries.length; ++i) {
21fbd254db71 Added support for converting 2D rasters into polygons.
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261 Element rangeElement = (Element)rangeNodes.item(i);
483
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diff changeset
262 double from = doubleValue(rangeElement.getAttribute("from"));
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diff changeset
263 double to = doubleValue(rangeElement.getAttribute("to"));
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diff changeset
264 int extIndex = intValue(rangeElement.getAttribute("index"), i);
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diff changeset
265 Color color = color(rangeElement.getAttribute("rgb"));
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266 String desc = rangeElement.getAttribute("description");
424
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267 if (from > to) { double t = from; from = to; to = t; }
483
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diff changeset
268 entries[i] = new Entry(i, extIndex, from, to, color, desc);
424
21fbd254db71 Added support for converting 2D rasters into polygons.
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269 rgbs[i] = color;
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270 }
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271
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272 buildLookup();
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273 }
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274
801
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275 /**
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276 * Constructor to split a given palette into a given number of
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277 * equal sized sub entries. Ranges of infinitive length are not
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278 * splitted.
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279 * @param original The source palette.
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280 * @param N The number of chunks to split single ranges into.
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281 */
435
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282 public Palette(Palette original, int N) {
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283 if (N < 2) {
67091b17462d Added code to split palette interval into equal sized parts.
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284 throw new IllegalArgumentException("N < 2");
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285 }
67091b17462d Added code to split palette interval into equal sized parts.
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286
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287 Entry [] origEntries = original.entries;
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288
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289 int newSize = 0;
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290 for (int i = 0; i < origEntries.length; ++i) {
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291 // cannot split infinity intervals
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292 newSize += origEntries[i].isInfinity() ? 1 : N;
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293 }
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294
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295 entries = new Entry[newSize];
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296 rgbs = new Color[newSize];
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297
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298 for (int i = 0, j = 0; i < origEntries.length; ++i) {
67091b17462d Added code to split palette interval into equal sized parts.
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diff changeset
299 Entry origEntry = origEntries[i];
67091b17462d Added code to split palette interval into equal sized parts.
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diff changeset
300 if (origEntry.isInfinity()) {
67091b17462d Added code to split palette interval into equal sized parts.
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301 // infinity intervals are just copied
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diff changeset
302 Entry nEntry = new Entry(origEntry);
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303 entries[j] = nEntry;
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304 rgbs[j] = nEntry.color;
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diff changeset
305 nEntry.index = j++;
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306 }
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307 else {
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308 // split interval into N parts
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diff changeset
309 double from = origEntry.from;
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diff changeset
310 double to = origEntry.to;
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diff changeset
311 double delta = (to - from)/N;
447
92b7ccbf6163 Improved generation of iso lines in vertical cross section.
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parents: 438
diff changeset
312 for (int k = 0; k < N; ++k) {
435
67091b17462d Added code to split palette interval into equal sized parts.
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diff changeset
313 Entry nEntry = new Entry(origEntry);
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diff changeset
314 nEntry.from = from;
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diff changeset
315 nEntry.to = from + delta;
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diff changeset
316 from += delta;
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317 entries[j] = nEntry;
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318 rgbs[j] = nEntry.color;
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diff changeset
319 nEntry.index = j++;
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320 }
67091b17462d Added code to split palette interval into equal sized parts.
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321 } // limited interval
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322 } // for all original entries
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diff changeset
323
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324 buildLookup();
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diff changeset
325 }
67091b17462d Added code to split palette interval into equal sized parts.
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diff changeset
326
483
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diff changeset
327 private static final int intValue(String s, int def) {
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parents: 449
diff changeset
328 if (s == null || (s = s.trim()).length() == 0) {
c8089cd7d777 Added explicit index scheme to palette classes to allow external references.
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diff changeset
329 return def;
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parents: 449
diff changeset
330 }
c8089cd7d777 Added explicit index scheme to palette classes to allow external references.
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diff changeset
331 try {
c8089cd7d777 Added explicit index scheme to palette classes to allow external references.
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diff changeset
332 return Integer.parseInt(s);
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diff changeset
333 }
c8089cd7d777 Added explicit index scheme to palette classes to allow external references.
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diff changeset
334 catch (NumberFormatException nfe) {
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diff changeset
335 log.error(nfe.getLocalizedMessage(), nfe);
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diff changeset
336 }
c8089cd7d777 Added explicit index scheme to palette classes to allow external references.
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diff changeset
337 return def;
c8089cd7d777 Added explicit index scheme to palette classes to allow external references.
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diff changeset
338 }
c8089cd7d777 Added explicit index scheme to palette classes to allow external references.
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diff changeset
339
424
21fbd254db71 Added support for converting 2D rasters into polygons.
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diff changeset
340 private static final double doubleValue(String s) {
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341 if (s == null || (s = s.trim()).length() == 0) {
21fbd254db71 Added support for converting 2D rasters into polygons.
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parents:
diff changeset
342 return 0d;
21fbd254db71 Added support for converting 2D rasters into polygons.
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parents:
diff changeset
343 }
21fbd254db71 Added support for converting 2D rasters into polygons.
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parents:
diff changeset
344 if ((s = s.toLowerCase()).startsWith("-inf")) {
21fbd254db71 Added support for converting 2D rasters into polygons.
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parents:
diff changeset
345 return -Double.MAX_VALUE; // XXX: Not using Double.NEGATIVE_INFINITY!
21fbd254db71 Added support for converting 2D rasters into polygons.
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parents:
diff changeset
346 }
21fbd254db71 Added support for converting 2D rasters into polygons.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
347
21fbd254db71 Added support for converting 2D rasters into polygons.
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parents:
diff changeset
348 if (s.startsWith("inf")) {
21fbd254db71 Added support for converting 2D rasters into polygons.
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diff changeset
349 return Double.MAX_VALUE; // XXX: Not using Double.NEGATIVE_INFINITY!
21fbd254db71 Added support for converting 2D rasters into polygons.
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parents:
diff changeset
350 }
21fbd254db71 Added support for converting 2D rasters into polygons.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
351
21fbd254db71 Added support for converting 2D rasters into polygons.
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parents:
diff changeset
352 return Double.parseDouble(s);
21fbd254db71 Added support for converting 2D rasters into polygons.
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parents:
diff changeset
353 }
21fbd254db71 Added support for converting 2D rasters into polygons.
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diff changeset
354
21fbd254db71 Added support for converting 2D rasters into polygons.
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diff changeset
355 private static final Color color(String s) {
21fbd254db71 Added support for converting 2D rasters into polygons.
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diff changeset
356 if (s == null || (s = s.trim()).length() == 0) {
21fbd254db71 Added support for converting 2D rasters into polygons.
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diff changeset
357 return null;
21fbd254db71 Added support for converting 2D rasters into polygons.
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parents:
diff changeset
358 }
21fbd254db71 Added support for converting 2D rasters into polygons.
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parents:
diff changeset
359 return Color.decode(s);
21fbd254db71 Added support for converting 2D rasters into polygons.
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parents:
diff changeset
360 }
21fbd254db71 Added support for converting 2D rasters into polygons.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
361
21fbd254db71 Added support for converting 2D rasters into polygons.
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parents:
diff changeset
362
801
d766fe2d917a More javadoc.
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parents: 798
diff changeset
363 /**
d766fe2d917a More javadoc.
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parents: 798
diff changeset
364 * Internal method to build the lookup tree.
d766fe2d917a More javadoc.
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parents: 798
diff changeset
365 */
424
21fbd254db71 Added support for converting 2D rasters into polygons.
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diff changeset
366 protected void buildLookup() {
21fbd254db71 Added support for converting 2D rasters into polygons.
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parents:
diff changeset
367 Arrays.sort(entries);
21fbd254db71 Added support for converting 2D rasters into polygons.
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parents:
diff changeset
368 lookup = buildLookup(entries, 0, entries.length-1);
21fbd254db71 Added support for converting 2D rasters into polygons.
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parents:
diff changeset
369 }
21fbd254db71 Added support for converting 2D rasters into polygons.
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diff changeset
370
801
d766fe2d917a More javadoc.
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diff changeset
371 /**
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diff changeset
372 * Creates a new palette which has ranges that are subdivided
d766fe2d917a More javadoc.
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diff changeset
373 * into a given number of sub ranges each.
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diff changeset
374 * @param N The number od sub divisions of each range.
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diff changeset
375 * @return The new created palette.
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parents: 798
diff changeset
376 */
435
67091b17462d Added code to split palette interval into equal sized parts.
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parents: 426
diff changeset
377 public Palette subdivide(int N) {
67091b17462d Added code to split palette interval into equal sized parts.
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parents: 426
diff changeset
378 return new Palette(this, N);
67091b17462d Added code to split palette interval into equal sized parts.
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parents: 426
diff changeset
379 }
67091b17462d Added code to split palette interval into equal sized parts.
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parents: 426
diff changeset
380
801
d766fe2d917a More javadoc.
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diff changeset
381 /**
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parents: 798
diff changeset
382 * Return the number of entries in this palette.
d766fe2d917a More javadoc.
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parents: 798
diff changeset
383 * @return The number of entries.
d766fe2d917a More javadoc.
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parents: 798
diff changeset
384 */
424
21fbd254db71 Added support for converting 2D rasters into polygons.
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parents:
diff changeset
385 public int getSize() {
21fbd254db71 Added support for converting 2D rasters into polygons.
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parents:
diff changeset
386 return rgbs.length;
21fbd254db71 Added support for converting 2D rasters into polygons.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
387 }
21fbd254db71 Added support for converting 2D rasters into polygons.
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parents:
diff changeset
388
801
d766fe2d917a More javadoc.
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parents: 798
diff changeset
389 /**
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parents: 798
diff changeset
390 * Return the color of an entry for a given index.
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parents: 798
diff changeset
391 * @param index The index.
d766fe2d917a More javadoc.
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parents: 798
diff changeset
392 * @return The color.
d766fe2d917a More javadoc.
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parents: 798
diff changeset
393 */
424
21fbd254db71 Added support for converting 2D rasters into polygons.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
394 public Color getColor(int index) {
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395 return rgbs[index];
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396 }
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397
801
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398 /**
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399 * Return the RGB value
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400 * @param index of an entry for a given index.
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401 * @return rgb value
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402 */
424
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403 public int indexToRGB(int index) {
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404 return rgbs[index].getRGB();
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405 }
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406
801
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407 /**
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408 * Searches for the index of an entry which contains the
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409 * given value.
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410 * @param value The value to be searched.
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411 * @return The index of the entry or -1 if no entry is found.
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412 */
424
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413 public int toIndex(double value) {
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414 return lookup.locate(value);
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415 }
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416
801
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417 /**
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418 * Searches for the an entry which contains the given value.
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419 * @param value The value to be searched.
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420 * @return The entry which contains the value or null if
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421 * no such entry is found.
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422 */
424
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423 public Entry getEntry(double value) {
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424 return lookup.locateEntry(value);
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425 }
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426
801
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427 /**
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428 * Searches the entry for a given index.
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429 * @param index The index of the entry.
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430 * @return The entry or null if no such entry is found.
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431 */
424
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432 public Entry getEntryByIndex(int index) {
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433 return lookup.findByIndex(index);
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434 }
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435 }
798
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436 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 :

http://dive4elements.wald.intevation.org