Mercurial > dive4elements > gnv-client

annotate gnv-artifacts/src/main/java/de/intevation/gnv/raster/Palette.java @ 447:92b7ccbf6163

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Improved generation of iso lines in vertical cross section. gnv-artifacts/trunk@495 c6561f87-3c4e-4783-a992-168aeb5c3f6f
author Sascha L. Teichmann <sascha.teichmann@intevation.de>
date Fri, 01 Jan 2010 21:52:41 +0000
parents 7399bb8f83ea
children 3cb2bea50456
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 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 double from;
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32 private double to;
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33
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34 private String description;
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35
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36 private Color color;
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37
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38 public Entry() {
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39 }
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40
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41 public Entry(Entry other) {
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42 index = other.index;
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43 from = other.from;
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44 to = other.to;
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45 description = other.description;
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46 color = other.color;
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47 }
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48
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49 public Entry(
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50 int index,
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51 double from,
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52 double to,
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53 Color color,
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54 String description
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55 ) {
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56 this.index = index;
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57 this.from = from;
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58 this.to = to;
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59 this.color = color;
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60 this.description = description;
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61 }
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62
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63 public int compareTo(Object other) {
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64 Entry e = (Entry)other;
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65 if (from < e.from) return -1;
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66 if (from > e.from) return +1;
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67 return 0;
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68 }
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69
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70 public Entry locateEntry(double value) {
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71 Entry current = this;
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72 while (current != null) {
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73 boolean b = value >= current.from;
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74 if (b && value <= current.to) {
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75 return current;
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76 }
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77 current = b
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78 ? current.right
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79 : current.left;
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80 }
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81 return null;
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82 }
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83
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84 public int locate(double value) {
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85 Entry entry = locateEntry(value);
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86 return entry != null
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87 ? entry.index
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88 : -1;
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89 }
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90
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91 public Entry findByIndex(int index) {
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92 Entry current = this;
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93 while (current != null) {
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94 if (current.index == index) {
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95 break;
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96 }
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97 current = index < current.index
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98 ? current.left
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99 : current.right;
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100 }
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101 return current;
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102 }
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103
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104 public String getDescription() {
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105 return description;
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106 }
435
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107
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108 public boolean isInfinity() {
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109 return from == -Double.MAX_VALUE
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110 || to == Double.MAX_VALUE;
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111 }
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112 } // class Entry
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113
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114 protected Entry [] entries;
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115 protected Entry lookup;
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116 protected Color [] rgbs;
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117
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118 private Entry buildLookup(Entry [] entries, int lo, int hi) {
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119 if (lo > hi) {
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120 return null;
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121 }
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122 int mid = (lo + hi)/2;
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123 Entry entry = entries[mid];
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124 entry.left = buildLookup(entries, lo, mid-1);
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125 entry.right = buildLookup(entries, mid+1, hi);
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126 return entry;
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127 }
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128
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129 public Palette() {
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130 }
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131
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132 public Palette(Document document) {
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133
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134 NodeList rangeNodes = document.getElementsByTagName("range");
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135
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136 entries = new Entry[rangeNodes.getLength()];
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137 rgbs = new Color[entries.length];
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138
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139 for (int i = 0; i < entries.length; ++i) {
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140 Element rangeElement = (Element)rangeNodes.item(i);
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141 double from = doubleValue(rangeElement.getAttribute("from"));
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142 double to = doubleValue(rangeElement.getAttribute("to"));
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143 Color color = color(rangeElement.getAttribute("rgb"));
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3a0c0ad113d9 Load palettes from configuration.
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144 String desc = rangeElement.getAttribute("description");
424
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145 if (from > to) { double t = from; from = to; to = t; }
426
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146 entries[i] = new Entry(i, from, to, color, desc);
424
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147 rgbs[i] = color;
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148 }
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149
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150 buildLookup();
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151 }
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152
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153 public Palette(Palette original, int N) {
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154 if (N < 2) {
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155 throw new IllegalArgumentException("N < 2");
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156 }
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157
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158 Entry [] origEntries = original.entries;
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159
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160 int newSize = 0;
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161 for (int i = 0; i < origEntries.length; ++i) {
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162 // cannot split infinity intervals
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163 newSize += origEntries[i].isInfinity() ? 1 : N;
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164 }
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165
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166 entries = new Entry[newSize];
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167 rgbs = new Color[newSize];
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168
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169 for (int i = 0, j = 0; i < origEntries.length; ++i) {
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170 Entry origEntry = origEntries[i];
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171 if (origEntry.isInfinity()) {
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172 // infinity intervals are just copied
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173 Entry nEntry = new Entry(origEntry);
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174 entries[j] = nEntry;
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175 rgbs[j] = nEntry.color;
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176 nEntry.index = j++;
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177 }
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178 else {
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179 // split interval into N parts
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180 double from = origEntry.from;
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181 double to = origEntry.to;
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182 double delta = (to - from)/N;
447
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183 for (int k = 0; k < N; ++k) {
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184 Entry nEntry = new Entry(origEntry);
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185 nEntry.from = from;
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186 nEntry.to = from + delta;
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187 from += delta;
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188 entries[j] = nEntry;
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189 rgbs[j] = nEntry.color;
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190 nEntry.index = j++;
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191 }
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192 } // limited interval
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193 } // for all original entries
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194
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195 buildLookup();
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196 }
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197
424
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198 private static final double doubleValue(String s) {
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199 if (s == null || (s = s.trim()).length() == 0) {
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200 return 0d;
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201 }
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202 if ((s = s.toLowerCase()).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 if (s.startsWith("inf")) {
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207 return Double.MAX_VALUE; // XXX: Not using Double.NEGATIVE_INFINITY!
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208 }
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209
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210 return Double.parseDouble(s);
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211 }
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212
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213 private static final Color color(String s) {
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214 if (s == null || (s = s.trim()).length() == 0) {
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215 return null;
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216 }
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217 return Color.decode(s);
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218 }
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219
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220
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221 protected void buildLookup() {
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222 Arrays.sort(entries);
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223 lookup = buildLookup(entries, 0, entries.length-1);
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224 }
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225
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226 public Palette subdivide(int N) {
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227 return new Palette(this, N);
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228 }
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229
424
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230 public int getSize() {
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231 return rgbs.length;
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232 }
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233
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234 public Color getColor(int index) {
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235 return rgbs[index];
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236 }
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237
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238 public int indexToRGB(int index) {
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239 return rgbs[index].getRGB();
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240 }
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241
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242 public int toIndex(double value) {
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243 return lookup.locate(value);
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244 }
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245
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246 public Entry getEntry(double value) {
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247 return lookup.locateEntry(value);
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248 }
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249
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250 public Entry getEntryByIndex(int index) {
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251 return lookup.findByIndex(index);
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252 }
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253 }
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254 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8:
http://dive4elements.wald.intevation.org