Mercurial > dive4elements > gnv-client

annotate gnv-artifacts/src/main/java/de/intevation/gnv/raster/Palette.java @ 435:67091b17462d

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Added code to split palette interval into equal sized parts. gnv-artifacts/trunk@483 c6561f87-3c4e-4783-a992-168aeb5c3f6f
author Sascha L. Teichmann <sascha.teichmann@intevation.de>
date Fri, 25 Dec 2009 12:00:14 +0000
parents 3a0c0ad113d9
children 7399bb8f83ea
rev   line source
424
21fbd254db71 Added support for converting 2D rasters into polygons.
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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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10
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11 import de.intevation.gnv.raster.Raster.ValueToIndex;
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12
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13 /**
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14 * @author Sascha L. Teichmann (sascha.teichmann@intevation.de)
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15 */
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16 public class Palette
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17 implements ValueToIndex
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18 {
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19 public static final class Entry
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20 implements Comparable
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21 {
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22 private Entry left;
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23 private Entry right;
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24
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25 private int index;
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26
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27 private double from;
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28 private double to;
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29
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30 private String description;
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31
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32 private Color color;
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33
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34 public Entry() {
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35 }
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36
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37 public Entry(Entry other) {
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38 index = other.index;
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39 from = other.from;
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40 to = other.to;
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41 description = other.description;
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42 color = other.color;
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43 }
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44
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45 public Entry(
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46 int index,
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47 double from,
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48 double to,
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49 Color color,
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50 String description
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51 ) {
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52 this.index = index;
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53 this.from = from;
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54 this.to = to;
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55 this.color = color;
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56 this.description = description;
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57 }
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58
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59 public int compareTo(Object other) {
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60 Entry e = (Entry)other;
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61 if (from < e.from) return -1;
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62 if (from > e.from) return +1;
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63 return 0;
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64 }
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65
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66 public Entry locateEntry(double value) {
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67 Entry current = this;
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68 while (current != null) {
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69 boolean b = value >= current.from;
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70 if (b && value <= current.to) {
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71 return current;
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72 }
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73 current = b
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74 ? current.right
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75 : current.left;
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76 }
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77 return null;
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78 }
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79
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80 public int locate(double value) {
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81 Entry entry = locateEntry(value);
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82 return entry != null
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83 ? entry.index
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84 : -1;
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85 }
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86
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87 public Entry findByIndex(int index) {
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88 Entry current = this;
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89 while (current != null) {
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90 if (current.index == index) {
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91 break;
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92 }
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93 current = index < current.index
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94 ? current.left
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95 : current.right;
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96 }
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97 return current;
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98 }
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99
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100 public String getDescription() {
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101 return description;
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102 }
435
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103
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104 public boolean isInfinity() {
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105 return from == -Double.MAX_VALUE
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106 || to == Double.MAX_VALUE;
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107 }
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108 } // class Entry
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109
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110 protected Entry [] entries;
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111 protected Entry lookup;
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112 protected Color [] rgbs;
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113 protected String description;
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114
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115 private Entry buildLookup(Entry [] entries, int lo, int hi) {
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116 if (lo > hi) {
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117 return null;
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118 }
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119 int mid = (lo + hi)/2;
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120 Entry entry = entries[mid];
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121 entry.left = buildLookup(entries, lo, mid-1);
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122 entry.right = buildLookup(entries, mid+1, hi);
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123 return entry;
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124 }
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125
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126 public Palette() {
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127 }
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128
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129 public Palette(Document document) {
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130 this(document, null);
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131 }
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132
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133 public Palette(Document document, String description) {
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134
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135 this.description = description;
424
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136
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137 NodeList rangeNodes = document.getElementsByTagName("range");
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138
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139 entries = new Entry[rangeNodes.getLength()];
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140 rgbs = new Color[entries.length];
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141
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142 for (int i = 0; i < entries.length; ++i) {
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143 Element rangeElement = (Element)rangeNodes.item(i);
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144 double from = doubleValue(rangeElement.getAttribute("from"));
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145 double to = doubleValue(rangeElement.getAttribute("to"));
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146 Color color = color(rangeElement.getAttribute("rgb"));
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147 String desc = rangeElement.getAttribute("description");
424
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148 if (from > to) { double t = from; from = to; to = t; }
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149 entries[i] = new Entry(i, from, to, color, desc);
424
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150 rgbs[i] = color;
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151 }
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152
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153 buildLookup();
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154 }
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155
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156 public Palette(Palette original, int N) {
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157 if (N < 2) {
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158 throw new IllegalArgumentException("N < 2");
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159 }
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160
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161 Entry [] origEntries = original.entries;
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162
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163 int newSize = 0;
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164 for (int i = 0; i < origEntries.length; ++i) {
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165 // cannot split infinity intervals
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166 newSize += origEntries[i].isInfinity() ? 1 : N;
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167 }
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168
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169 entries = new Entry[newSize];
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170 rgbs = new Color[newSize];
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171
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172 for (int i = 0, j = 0; i < origEntries.length; ++i) {
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173 Entry origEntry = origEntries[i];
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174 if (origEntry.isInfinity()) {
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175 // infinity intervals are just copied
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176 Entry nEntry = new Entry(origEntry);
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177 entries[j] = nEntry;
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178 rgbs[j] = nEntry.color;
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179 nEntry.index = j++;
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180 }
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181 else {
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182 // split interval into N parts
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183 double from = origEntry.from;
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184 double to = origEntry.to;
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185 double delta = (to - from)/N;
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186 while (from < to) {
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187 Entry nEntry = new Entry(origEntry);
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188 nEntry.from = from;
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189 nEntry.to = from + delta;
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190 from += delta;
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191 entries[j] = nEntry;
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192 rgbs[j] = nEntry.color;
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193 nEntry.index = j++;
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194 }
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195 } // limited interval
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196 } // for all original entries
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197
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198 buildLookup();
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199 }
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200
424
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201 private static final double doubleValue(String s) {
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202 if (s == null || (s = s.trim()).length() == 0) {
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203 return 0d;
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204 }
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205 if ((s = s.toLowerCase()).startsWith("-inf")) {
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206 return -Double.MAX_VALUE; // XXX: Not using Double.NEGATIVE_INFINITY!
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207 }
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208
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209 if (s.startsWith("inf")) {
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210 return Double.MAX_VALUE; // XXX: Not using Double.NEGATIVE_INFINITY!
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211 }
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212
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213 return Double.parseDouble(s);
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214 }
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215
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216 private static final Color color(String s) {
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217 if (s == null || (s = s.trim()).length() == 0) {
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218 return null;
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219 }
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220 return Color.decode(s);
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221 }
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222
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223
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224 protected void buildLookup() {
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225 Arrays.sort(entries);
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226 lookup = buildLookup(entries, 0, entries.length-1);
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227 }
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228
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229 public Palette subdivide(int N) {
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230 return new Palette(this, N);
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231 }
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232
426
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233 public String getDescription() {
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234 return description;
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235 }
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236
424
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237 public int getSize() {
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238 return rgbs.length;
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239 }
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240
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241 public Color getColor(int index) {
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242 return rgbs[index];
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243 }
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244
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245 public int indexToRGB(int index) {
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246 return rgbs[index].getRGB();
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247 }
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248
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249 public int toIndex(double value) {
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250 return lookup.locate(value);
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251 }
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252
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253 public Entry getEntry(double value) {
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254 return lookup.locateEntry(value);
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255 }
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256
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257 public Entry getEntryByIndex(int index) {
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258 return lookup.findByIndex(index);
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259 }
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260 }
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261 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8:
http://dive4elements.wald.intevation.org