Mercurial > dive4elements > gnv-client

annotate gnv-artifacts/src/main/java/de/intevation/gnv/raster/Palette.java @ 801:d766fe2d917a

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More javadoc. gnv-artifacts/trunk@883 c6561f87-3c4e-4783-a992-168aeb5c3f6f
author Sascha L. Teichmann <sascha.teichmann@intevation.de>
date Tue, 06 Apr 2010 16:53:43 +0000
parents 6cff63d0c434
children feae2f9d6c6f
rev   line source
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1 package de.intevation.gnv.raster;
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2
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3 import de.intevation.gnv.raster.Raster.ValueToIndex;
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4
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5 import java.awt.Color;
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6
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7 import java.util.Arrays;
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8
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9 import org.apache.log4j.Logger;
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11 import org.w3c.dom.Document;
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12 import org.w3c.dom.Element;
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13 import org.w3c.dom.NodeList;
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14
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15 /**
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16 * Lookup mechanism to map double values from a list of
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17 * ranges onto a set of colors and vice versa.
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18 * @author <a href="mailto:sascha.teichmann@intevation.de">Sascha L. Teichmann</a>
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19 */
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20 public class Palette
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21 implements ValueToIndex
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22 {
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23 private static Logger log = Logger.getLogger(Palette.class);
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24
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25 /**
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26 * An entry in the lookup table.
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27 */
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28 public static final class Entry
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29 implements Comparable
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30 {
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31 private Entry left;
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32 private Entry right;
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33
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34 private int index;
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35
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36 private int externalIndex;
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37
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38 private double from;
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39 private double to;
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40
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41 private String description;
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42
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43 private Color color;
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44
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45 /**
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46 * Default constructor
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47 */
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48 public Entry() {
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49 }
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50
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51 /**
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52 * Copy constructor
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53 * @param other The entry to copy.
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54 */
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55 public Entry(Entry other) {
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56 index = other.index;
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57 externalIndex = other.externalIndex;
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58 from = other.from;
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59 to = other.to;
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60 description = other.description;
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61 color = other.color;
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62 }
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63
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64 /**
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65 * Constructor to set the palette index, the exteral index,
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66 * the value range, the color and the description.
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67 * @param index The pallette index
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68 * @param externalIndex The external index
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69 * @param from Start of the interval
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70 * @param to End of the interval
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71 * @param color The color belonging to this interval.
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72 * @param description The description of this range.
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73 */
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74 public Entry(
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75 int index,
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76 int externalIndex,
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77 double from,
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78 double to,
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79 Color color,
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80 String description
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81 ) {
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82 this.index = index;
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83 this.externalIndex = externalIndex;
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84 this.from = from;
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85 this.to = to;
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86 this.color = color;
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87 this.description = description;
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88 }
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89
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90 /**
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91 * Compares two entries by the start point of the interval.
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92 * @param other
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93 * @return -1 if this start point is before other. +1 if this
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94 * start point is after, else 0.
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95 */
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96 public int compareTo(Object other) {
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97 Entry e = (Entry)other;
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98 if (from < e.from) return -1;
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99 if (from > e.from) return +1;
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100 return 0;
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101 }
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102
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103 /**
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104 * The starting point of the interval.
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105 * @return The starting point.
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106 */
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107 public double getFrom() {
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108 return from;
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109 }
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110
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111 /**
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112 * The end point of the interval.
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113 * @return The end point.
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114 */
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115 public double getTo() {
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116 return to;
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117 }
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118
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119 /**
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120 * The color of the entry.
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121 * @return The color.
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122 */
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123 public Color getColor() {
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124 return color;
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125 }
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126
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127 /**
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128 * The external index of this entry. Useful to model
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129 * external joins.
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130 * @return The external index.
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131 */
483
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132 public int getExternalIndex() {
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133 return externalIndex;
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134 }
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135
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136 /**
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137 * Searches for an entry which has a range that contains
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138 * the given value.
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139 * @param value The value to be searched.
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140 * @return The entry containing the value or null if no such
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141 * entry exists.
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142 */
424
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143 public Entry locateEntry(double value) {
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144 Entry current = this;
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145 while (current != null) {
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146 boolean b = value >= current.from;
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147 if (b && value <= current.to) {
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148 return current;
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149 }
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150 current = b
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151 ? current.right
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152 : current.left;
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153 }
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154 return null;
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155 }
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156
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157 /**
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158 * Returns the palette index for a given value.
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159 * @param value The value to search.
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160 * @return The index of the palette entry or -1 if
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161 * no such entry exists.
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162 */
424
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163 public int locate(double value) {
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164 Entry entry = locateEntry(value);
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165 return entry != null
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166 ? entry.index
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167 : -1;
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168 }
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169
801
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170 /**
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171 * Searches for an interval with a given index.
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172 * @param index The index to be searched.
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173 * @return The entry with the given index or null if no
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174 * such entry exists.
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175 */
424
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176 public Entry findByIndex(int index) {
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177 Entry current = this;
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178 while (current != null) {
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179 if (current.index == index) {
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180 break;
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181 }
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182 current = index < current.index
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183 ? current.left
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184 : current.right;
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185 }
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186 return current;
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187 }
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188
801
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189 /**
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190 * The description of this entry.
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191 * @return The description.
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192 */
424
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193 public String getDescription() {
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194 return description;
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195 }
435
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196
801
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197 /**
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198 * Determines if the range of this entry has
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199 * infinitive length.
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200 * @return true if the range of this entry has infinitive
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201 * length else false.
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202 */
435
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203 public boolean isInfinity() {
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204 return from == -Double.MAX_VALUE
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205 || to == Double.MAX_VALUE;
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206 }
424
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207 } // class Entry
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208
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209 /**
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210 * Internal table of the entrys.
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211 */
424
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212 protected Entry [] entries;
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213
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214 /**
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215 * Root of the entry tree used to map values to entries.
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216 */
424
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217 protected Entry lookup;
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218
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219 /**
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220 * The list of colors used by this palette.
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221 */
424
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222 protected Color [] rgbs;
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223
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224 private Entry buildLookup(Entry [] entries, int lo, int hi) {
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225 if (lo > hi) {
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226 return null;
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227 }
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228 int mid = (lo + hi)/2;
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229 Entry entry = entries[mid];
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230 entry.left = buildLookup(entries, lo, mid-1);
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231 entry.right = buildLookup(entries, mid+1, hi);
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232 return entry;
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233 }
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234
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235 /**
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236 * Default constructor.
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237 */
424
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238 public Palette() {
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239 }
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240
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241 /**
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242 * Constructor to create the palette from an XML document.
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243 * @param document The document with palette information.
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244 */
424
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245 public Palette(Document document) {
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246
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247 NodeList rangeNodes = document.getElementsByTagName("range");
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248
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249 entries = new Entry[rangeNodes.getLength()];
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250 rgbs = new Color[entries.length];
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251
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252 for (int i = 0; i < entries.length; ++i) {
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253 Element rangeElement = (Element)rangeNodes.item(i);
483
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diff changeset
254 double from = doubleValue(rangeElement.getAttribute("from"));
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255 double to = doubleValue(rangeElement.getAttribute("to"));
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256 int extIndex = intValue(rangeElement.getAttribute("index"), i);
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257 Color color = color(rangeElement.getAttribute("rgb"));
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258 String desc = rangeElement.getAttribute("description");
424
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259 if (from > to) { double t = from; from = to; to = t; }
483
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260 entries[i] = new Entry(i, extIndex, from, to, color, desc);
424
21fbd254db71 Added support for converting 2D rasters into polygons.
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261 rgbs[i] = color;
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262 }
21fbd254db71 Added support for converting 2D rasters into polygons.
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263
21fbd254db71 Added support for converting 2D rasters into polygons.
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264 buildLookup();
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265 }
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266
801
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267 /**
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268 * Constructor to split a given palette into a given number of
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269 * equal sized sub entries. Ranges of infinitive length are not
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270 * splitted.
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271 * @param original The source palette.
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272 * @param N The number of chunks to split single ranges into.
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273 */
435
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274 public Palette(Palette original, int N) {
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275 if (N < 2) {
67091b17462d Added code to split palette interval into equal sized parts.
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276 throw new IllegalArgumentException("N < 2");
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277 }
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278
67091b17462d Added code to split palette interval into equal sized parts.
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279 Entry [] origEntries = original.entries;
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280
67091b17462d Added code to split palette interval into equal sized parts.
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281 int newSize = 0;
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282 for (int i = 0; i < origEntries.length; ++i) {
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283 // cannot split infinity intervals
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284 newSize += origEntries[i].isInfinity() ? 1 : N;
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285 }
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286
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287 entries = new Entry[newSize];
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288 rgbs = new Color[newSize];
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289
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290 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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291 Entry origEntry = origEntries[i];
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diff changeset
292 if (origEntry.isInfinity()) {
67091b17462d Added code to split palette interval into equal sized parts.
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293 // infinity intervals are just copied
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294 Entry nEntry = new Entry(origEntry);
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295 entries[j] = nEntry;
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296 rgbs[j] = nEntry.color;
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297 nEntry.index = j++;
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298 }
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299 else {
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300 // split interval into N parts
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301 double from = origEntry.from;
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302 double to = origEntry.to;
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303 double delta = (to - from)/N;
447
92b7ccbf6163 Improved generation of iso lines in vertical cross section.
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parents: 438
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304 for (int k = 0; k < N; ++k) {
435
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diff changeset
305 Entry nEntry = new Entry(origEntry);
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diff changeset
306 nEntry.from = from;
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diff changeset
307 nEntry.to = from + delta;
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308 from += delta;
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309 entries[j] = nEntry;
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310 rgbs[j] = nEntry.color;
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diff changeset
311 nEntry.index = j++;
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312 }
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313 } // limited interval
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314 } // for all original entries
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315
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316 buildLookup();
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317 }
67091b17462d Added code to split palette interval into equal sized parts.
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diff changeset
318
483
c8089cd7d777 Added explicit index scheme to palette classes to allow external references.
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diff changeset
319 private static final int intValue(String s, int def) {
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parents: 449
diff changeset
320 if (s == null || (s = s.trim()).length() == 0) {
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parents: 449
diff changeset
321 return def;
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parents: 449
diff changeset
322 }
c8089cd7d777 Added explicit index scheme to palette classes to allow external references.
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parents: 449
diff changeset
323 try {
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diff changeset
324 return Integer.parseInt(s);
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diff changeset
325 }
c8089cd7d777 Added explicit index scheme to palette classes to allow external references.
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diff changeset
326 catch (NumberFormatException nfe) {
c8089cd7d777 Added explicit index scheme to palette classes to allow external references.
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parents: 449
diff changeset
327 log.error(nfe.getLocalizedMessage(), nfe);
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diff changeset
328 }
c8089cd7d777 Added explicit index scheme to palette classes to allow external references.
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parents: 449
diff changeset
329 return def;
c8089cd7d777 Added explicit index scheme to palette classes to allow external references.
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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
424
21fbd254db71 Added support for converting 2D rasters into polygons.
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332 private static final double doubleValue(String s) {
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333 if (s == null || (s = s.trim()).length() == 0) {
21fbd254db71 Added support for converting 2D rasters into polygons.
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parents:
diff changeset
334 return 0d;
21fbd254db71 Added support for converting 2D rasters into polygons.
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parents:
diff changeset
335 }
21fbd254db71 Added support for converting 2D rasters into polygons.
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parents:
diff changeset
336 if ((s = s.toLowerCase()).startsWith("-inf")) {
21fbd254db71 Added support for converting 2D rasters into polygons.
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parents:
diff changeset
337 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
338 }
21fbd254db71 Added support for converting 2D rasters into polygons.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
339
21fbd254db71 Added support for converting 2D rasters into polygons.
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parents:
diff changeset
340 if (s.startsWith("inf")) {
21fbd254db71 Added support for converting 2D rasters into polygons.
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parents:
diff changeset
341 return Double.MAX_VALUE; // XXX: Not using Double.NEGATIVE_INFINITY!
21fbd254db71 Added support for converting 2D rasters into polygons.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
342 }
21fbd254db71 Added support for converting 2D rasters into polygons.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
343
21fbd254db71 Added support for converting 2D rasters into polygons.
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diff changeset
344 return Double.parseDouble(s);
21fbd254db71 Added support for converting 2D rasters into polygons.
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parents:
diff changeset
345 }
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.
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diff changeset
347 private static final Color color(String s) {
21fbd254db71 Added support for converting 2D rasters into polygons.
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348 if (s == null || (s = s.trim()).length() == 0) {
21fbd254db71 Added support for converting 2D rasters into polygons.
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parents:
diff changeset
349 return null;
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.
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parents:
diff changeset
351 return Color.decode(s);
21fbd254db71 Added support for converting 2D rasters into polygons.
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parents:
diff changeset
352 }
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
801
d766fe2d917a More javadoc.
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parents: 798
diff changeset
355 /**
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parents: 798
diff changeset
356 * Internal method to build the lookup tree.
d766fe2d917a More javadoc.
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parents: 798
diff changeset
357 */
424
21fbd254db71 Added support for converting 2D rasters into polygons.
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parents:
diff changeset
358 protected void buildLookup() {
21fbd254db71 Added support for converting 2D rasters into polygons.
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parents:
diff changeset
359 Arrays.sort(entries);
21fbd254db71 Added support for converting 2D rasters into polygons.
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parents:
diff changeset
360 lookup = buildLookup(entries, 0, entries.length-1);
21fbd254db71 Added support for converting 2D rasters into polygons.
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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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diff changeset
363 /**
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diff changeset
364 * Creates a new palette which has ranges that are subdivided
d766fe2d917a More javadoc.
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parents: 798
diff changeset
365 * into a given number of sub ranges each.
d766fe2d917a More javadoc.
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diff changeset
366 * @param N The number od sub divisions of each range.
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diff changeset
367 * @return The new created palette.
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parents: 798
diff changeset
368 */
435
67091b17462d Added code to split palette interval into equal sized parts.
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parents: 426
diff changeset
369 public Palette subdivide(int N) {
67091b17462d Added code to split palette interval into equal sized parts.
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parents: 426
diff changeset
370 return new Palette(this, N);
67091b17462d Added code to split palette interval into equal sized parts.
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parents: 426
diff changeset
371 }
67091b17462d Added code to split palette interval into equal sized parts.
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parents: 426
diff changeset
372
801
d766fe2d917a More javadoc.
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diff changeset
373 /**
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parents: 798
diff changeset
374 * Return the number of entries in this palette.
d766fe2d917a More javadoc.
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parents: 798
diff changeset
375 * @return The number of entries.
d766fe2d917a More javadoc.
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parents: 798
diff changeset
376 */
424
21fbd254db71 Added support for converting 2D rasters into polygons.
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parents:
diff changeset
377 public int getSize() {
21fbd254db71 Added support for converting 2D rasters into polygons.
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parents:
diff changeset
378 return rgbs.length;
21fbd254db71 Added support for converting 2D rasters into polygons.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
379 }
21fbd254db71 Added support for converting 2D rasters into polygons.
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parents:
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 color of an entry for a given index.
d766fe2d917a More javadoc.
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parents: 798
diff changeset
383 * @param index The index.
d766fe2d917a More javadoc.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 798
diff changeset
384 * @return The color.
d766fe2d917a More javadoc.
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parents: 798
diff changeset
385 */
424
21fbd254db71 Added support for converting 2D rasters into polygons.
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parents:
diff changeset
386 public Color getColor(int index) {
21fbd254db71 Added support for converting 2D rasters into polygons.
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parents:
diff changeset
387 return rgbs[index];
21fbd254db71 Added support for converting 2D rasters into polygons.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
388 }
21fbd254db71 Added support for converting 2D rasters into polygons.
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parents:
diff changeset
389
801
d766fe2d917a More javadoc.
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parents: 798
diff changeset
390 /**
d766fe2d917a More javadoc.
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parents: 798
diff changeset
391 * Return the RGB value
d766fe2d917a More javadoc.
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parents: 798
diff changeset
392 * @param index of an entry for a given index.
d766fe2d917a More javadoc.
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parents: 798
diff changeset
393 * @return rgb value
d766fe2d917a More javadoc.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 798
diff changeset
394 */
424
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395 public int indexToRGB(int index) {
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396 return rgbs[index].getRGB();
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397 }
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398
801
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399 /**
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400 * Searches for the index of an entry which contains the
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401 * given value.
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402 * @param value The value to be searched.
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403 * @return The index of the entry or -1 if no entry is found.
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404 */
424
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405 public int toIndex(double value) {
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406 return lookup.locate(value);
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407 }
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408
801
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409 /**
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410 * Searches for the an entry which contains the given value.
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411 * @param value The value to be searched.
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412 * @return The entry which contains the value or null if
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413 * no such entry is found.
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414 */
424
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415 public Entry getEntry(double value) {
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416 return lookup.locateEntry(value);
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417 }
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418
801
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419 /**
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420 * Searches the entry for a given index.
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421 * @param index The index of the entry.
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422 * @return The entry or null if no such entry is found.
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423 */
424
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424 public Entry getEntryByIndex(int index) {
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425 return lookup.findByIndex(index);
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426 }
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427 }
798
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428 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 :
http://dive4elements.wald.intevation.org