Mercurial > dive4elements > gnv-client

annotate gnv-artifacts/src/main/java/de/intevation/gnv/raster/Palette.java @ 438:7399bb8f83ea

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
Added manager to handle several levels of palette subdivsions. Added parameter ids to identify the palette associated with a parameter gnv-artifacts/trunk@486 c6561f87-3c4e-4783-a992-168aeb5c3f6f
author Sascha L. Teichmann <sascha.teichmann@intevation.de>
date Mon, 28 Dec 2009 11:50:27 +0000
parents 67091b17462d
children 92b7ccbf6163
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
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114 private Entry buildLookup(Entry [] entries, int lo, int hi) {
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115 if (lo > hi) {
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116 return null;
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117 }
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118 int mid = (lo + hi)/2;
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119 Entry entry = entries[mid];
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120 entry.left = buildLookup(entries, lo, mid-1);
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121 entry.right = buildLookup(entries, mid+1, hi);
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122 return entry;
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123 }
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124
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125 public Palette() {
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126 }
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127
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128 public Palette(Document document) {
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129
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130 NodeList rangeNodes = document.getElementsByTagName("range");
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131
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132 entries = new Entry[rangeNodes.getLength()];
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133 rgbs = new Color[entries.length];
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134
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135 for (int i = 0; i < entries.length; ++i) {
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136 Element rangeElement = (Element)rangeNodes.item(i);
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137 double from = doubleValue(rangeElement.getAttribute("from"));
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138 double to = doubleValue(rangeElement.getAttribute("to"));
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139 Color color = color(rangeElement.getAttribute("rgb"));
426
3a0c0ad113d9 Load palettes from configuration.
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140 String desc = rangeElement.getAttribute("description");
424
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141 if (from > to) { double t = from; from = to; to = t; }
426
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142 entries[i] = new Entry(i, from, to, color, desc);
424
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143 rgbs[i] = color;
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144 }
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145
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146 buildLookup();
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147 }
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148
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149 public Palette(Palette original, int N) {
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150 if (N < 2) {
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151 throw new IllegalArgumentException("N < 2");
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152 }
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153
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154 Entry [] origEntries = original.entries;
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155
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156 int newSize = 0;
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157 for (int i = 0; i < origEntries.length; ++i) {
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158 // cannot split infinity intervals
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159 newSize += origEntries[i].isInfinity() ? 1 : N;
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160 }
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161
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162 entries = new Entry[newSize];
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163 rgbs = new Color[newSize];
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164
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165 for (int i = 0, j = 0; i < origEntries.length; ++i) {
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166 Entry origEntry = origEntries[i];
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167 if (origEntry.isInfinity()) {
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168 // infinity intervals are just copied
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169 Entry nEntry = new Entry(origEntry);
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170 entries[j] = nEntry;
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171 rgbs[j] = nEntry.color;
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172 nEntry.index = j++;
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173 }
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174 else {
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175 // split interval into N parts
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176 double from = origEntry.from;
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177 double to = origEntry.to;
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178 double delta = (to - from)/N;
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179 while (from < to) {
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180 Entry nEntry = new Entry(origEntry);
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181 nEntry.from = from;
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182 nEntry.to = from + delta;
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183 from += delta;
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184 entries[j] = nEntry;
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185 rgbs[j] = nEntry.color;
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186 nEntry.index = j++;
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187 }
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188 } // limited interval
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189 } // for all original entries
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190
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191 buildLookup();
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192 }
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193
424
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194 private static final double doubleValue(String s) {
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195 if (s == null || (s = s.trim()).length() == 0) {
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196 return 0d;
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197 }
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198 if ((s = s.toLowerCase()).startsWith("-inf")) {
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199 return -Double.MAX_VALUE; // XXX: Not using Double.NEGATIVE_INFINITY!
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200 }
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201
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202 if (s.startsWith("inf")) {
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203 return Double.MAX_VALUE; // XXX: Not using Double.NEGATIVE_INFINITY!
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204 }
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205
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206 return Double.parseDouble(s);
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207 }
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208
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209 private static final Color color(String s) {
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210 if (s == null || (s = s.trim()).length() == 0) {
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211 return null;
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212 }
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213 return Color.decode(s);
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214 }
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215
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216
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217 protected void buildLookup() {
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218 Arrays.sort(entries);
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219 lookup = buildLookup(entries, 0, entries.length-1);
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220 }
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221
435
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222 public Palette subdivide(int N) {
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223 return new Palette(this, N);
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224 }
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225
424
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226 public int getSize() {
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227 return rgbs.length;
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228 }
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229
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230 public Color getColor(int index) {
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231 return rgbs[index];
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diff changeset
232 }
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233
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234 public int indexToRGB(int index) {
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235 return rgbs[index].getRGB();
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236 }
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237
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238 public int toIndex(double value) {
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diff changeset
239 return lookup.locate(value);
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diff changeset
240 }
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241
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242 public Entry getEntry(double value) {
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diff changeset
243 return lookup.locateEntry(value);
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244 }
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245
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246 public Entry getEntryByIndex(int index) {
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diff changeset
247 return lookup.findByIndex(index);
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248 }
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249 }
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250 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8:
http://dive4elements.wald.intevation.org