Mercurial > dive4elements > gnv-client

annotate gnv-artifacts/src/main/java/de/intevation/gnv/raster/Palette.java @ 626:61f688a69a55

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Split up export modes from output modes. gnv-artifacts/trunk@700 c6561f87-3c4e-4783-a992-168aeb5c3f6f
author Ingo Weinzierl <ingo.weinzierl@intevation.de>
date Tue, 23 Feb 2010 11:47:08 +0000
parents c8089cd7d777
children 9a828e5a2390
rev   line source
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1 package de.intevation.gnv.raster;
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2
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3 import org.w3c.dom.Document;
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4 import org.w3c.dom.Element;
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5 import org.w3c.dom.NodeList;
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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 java.awt.Color;
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11 import org.apache.log4j.Logger;
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12
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13 import de.intevation.gnv.raster.Raster.ValueToIndex;
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14
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15 /**
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16 * @author Sascha L. Teichmann (sascha.teichmann@intevation.de)
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17 */
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18 public class Palette
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19 implements ValueToIndex
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20 {
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21 private static Logger log = Logger.getLogger(Palette.class);
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22
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23 public static final class Entry
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24 implements Comparable
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25 {
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26 private Entry left;
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27 private Entry right;
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28
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29 private int index;
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30
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31 private int externalIndex;
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32
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33 private double from;
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34 private double to;
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35
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36 private String description;
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37
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38 private Color color;
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39
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40 public Entry() {
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41 }
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42
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43 public Entry(Entry other) {
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44 index = other.index;
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45 externalIndex = other.externalIndex;
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46 from = other.from;
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47 to = other.to;
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48 description = other.description;
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49 color = other.color;
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50 }
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51
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52 public Entry(
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53 int index,
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54 int externalIndex,
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55 double from,
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56 double to,
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57 Color color,
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58 String description
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59 ) {
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60 this.index = index;
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61 this.externalIndex = externalIndex;
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62 this.from = from;
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63 this.to = to;
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64 this.color = color;
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65 this.description = description;
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66 }
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67
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68 public int compareTo(Object other) {
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69 Entry e = (Entry)other;
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70 if (from < e.from) return -1;
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71 if (from > e.from) return +1;
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72 return 0;
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73 }
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74
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75 public double getFrom() {
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76 return from;
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77 }
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78
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79 public double getTo() {
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80 return to;
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81 }
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82
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83 public Color getColor() {
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84 return color;
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85 }
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86
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87 public int getExternalIndex() {
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88 return externalIndex;
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89 }
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90
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91 public Entry locateEntry(double value) {
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92 Entry current = this;
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93 while (current != null) {
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94 boolean b = value >= current.from;
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95 if (b && value <= current.to) {
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96 return current;
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97 }
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98 current = b
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99 ? current.right
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100 : current.left;
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101 }
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102 return null;
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103 }
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104
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105 public int locate(double value) {
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106 Entry entry = locateEntry(value);
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107 return entry != null
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108 ? entry.index
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109 : -1;
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110 }
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111
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112 public Entry findByIndex(int index) {
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113 Entry current = this;
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114 while (current != null) {
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115 if (current.index == index) {
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116 break;
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117 }
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118 current = index < current.index
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119 ? current.left
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120 : current.right;
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121 }
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122 return current;
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123 }
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124
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125 public String getDescription() {
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126 return description;
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127 }
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128
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129 public boolean isInfinity() {
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130 return from == -Double.MAX_VALUE
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131 || to == Double.MAX_VALUE;
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132 }
424
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133 } // class Entry
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134
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135 protected Entry [] entries;
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136 protected Entry lookup;
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137 protected Color [] rgbs;
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138
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139 private Entry buildLookup(Entry [] entries, int lo, int hi) {
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140 if (lo > hi) {
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141 return null;
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142 }
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143 int mid = (lo + hi)/2;
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144 Entry entry = entries[mid];
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145 entry.left = buildLookup(entries, lo, mid-1);
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146 entry.right = buildLookup(entries, mid+1, hi);
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147 return entry;
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148 }
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149
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150 public Palette() {
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151 }
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152
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153 public Palette(Document document) {
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154
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155 NodeList rangeNodes = document.getElementsByTagName("range");
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156
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157 entries = new Entry[rangeNodes.getLength()];
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158 rgbs = new Color[entries.length];
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159
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160 for (int i = 0; i < entries.length; ++i) {
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161 Element rangeElement = (Element)rangeNodes.item(i);
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162 double from = doubleValue(rangeElement.getAttribute("from"));
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163 double to = doubleValue(rangeElement.getAttribute("to"));
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164 int extIndex = intValue(rangeElement.getAttribute("index"), i);
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165 Color color = color(rangeElement.getAttribute("rgb"));
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166 String desc = rangeElement.getAttribute("description");
424
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167 if (from > to) { double t = from; from = to; to = t; }
483
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168 entries[i] = new Entry(i, extIndex, from, to, color, desc);
424
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169 rgbs[i] = color;
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170 }
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171
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172 buildLookup();
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173 }
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174
435
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175 public Palette(Palette original, int N) {
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176 if (N < 2) {
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177 throw new IllegalArgumentException("N < 2");
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178 }
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179
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180 Entry [] origEntries = original.entries;
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181
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182 int newSize = 0;
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183 for (int i = 0; i < origEntries.length; ++i) {
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184 // cannot split infinity intervals
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185 newSize += origEntries[i].isInfinity() ? 1 : N;
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186 }
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187
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188 entries = new Entry[newSize];
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189 rgbs = new Color[newSize];
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190
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191 for (int i = 0, j = 0; i < origEntries.length; ++i) {
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192 Entry origEntry = origEntries[i];
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193 if (origEntry.isInfinity()) {
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194 // infinity intervals are just copied
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195 Entry nEntry = new Entry(origEntry);
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196 entries[j] = nEntry;
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197 rgbs[j] = nEntry.color;
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198 nEntry.index = j++;
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199 }
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200 else {
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201 // split interval into N parts
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202 double from = origEntry.from;
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203 double to = origEntry.to;
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204 double delta = (to - from)/N;
447
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205 for (int k = 0; k < N; ++k) {
435
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206 Entry nEntry = new Entry(origEntry);
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207 nEntry.from = from;
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208 nEntry.to = from + delta;
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209 from += delta;
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210 entries[j] = nEntry;
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211 rgbs[j] = nEntry.color;
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212 nEntry.index = j++;
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213 }
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214 } // limited interval
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215 } // for all original entries
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216
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217 buildLookup();
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218 }
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219
483
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diff changeset
220 private static final int intValue(String s, int def) {
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diff changeset
221 if (s == null || (s = s.trim()).length() == 0) {
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222 return def;
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223 }
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diff changeset
224 try {
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diff changeset
225 return Integer.parseInt(s);
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226 }
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227 catch (NumberFormatException nfe) {
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diff changeset
228 log.error(nfe.getLocalizedMessage(), nfe);
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229 }
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230 return def;
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231 }
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diff changeset
232
424
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233 private static final double doubleValue(String s) {
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234 if (s == null || (s = s.trim()).length() == 0) {
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235 return 0d;
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236 }
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diff changeset
237 if ((s = s.toLowerCase()).startsWith("-inf")) {
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diff changeset
238 return -Double.MAX_VALUE; // XXX: Not using Double.NEGATIVE_INFINITY!
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diff changeset
239 }
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diff changeset
240
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diff changeset
241 if (s.startsWith("inf")) {
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242 return Double.MAX_VALUE; // XXX: Not using Double.NEGATIVE_INFINITY!
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243 }
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244
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245 return Double.parseDouble(s);
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246 }
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247
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248 private static final Color color(String s) {
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249 if (s == null || (s = s.trim()).length() == 0) {
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250 return null;
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251 }
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252 return Color.decode(s);
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253 }
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254
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255
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256 protected void buildLookup() {
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257 Arrays.sort(entries);
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diff changeset
258 lookup = buildLookup(entries, 0, entries.length-1);
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259 }
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260
435
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261 public Palette subdivide(int N) {
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262 return new Palette(this, N);
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263 }
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264
424
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265 public int getSize() {
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266 return rgbs.length;
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267 }
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268
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269 public Color getColor(int index) {
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270 return rgbs[index];
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271 }
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272
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273 public int indexToRGB(int index) {
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274 return rgbs[index].getRGB();
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275 }
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276
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277 public int toIndex(double value) {
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278 return lookup.locate(value);
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279 }
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280
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281 public Entry getEntry(double value) {
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282 return lookup.locateEntry(value);
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283 }
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284
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285 public Entry getEntryByIndex(int index) {
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286 return lookup.findByIndex(index);
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287 }
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288 }
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289 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8:
http://dive4elements.wald.intevation.org