Mercurial > dive4elements > gnv-client

annotate gnv-artifacts/src/main/java/de/intevation/gnv/raster/Palette.java @ 468:7ba4c7222265

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Added ij-Index determination for horizontal-cross-sections. gnv-artifacts/trunk@531 c6561f87-3c4e-4783-a992-168aeb5c3f6f
author Tim Englich <tim.englich@intevation.de>
date Tue, 12 Jan 2010 11:34:25 +0000
parents c7ca2fce041f
children c8089cd7d777
rev   line source
424
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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 double getFrom() {
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71 return from;
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72 }
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73
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74 public double getTo() {
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75 return to;
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76 }
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77
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78 public Color getColor() {
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79 return color;
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80 }
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81
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82 public Entry locateEntry(double value) {
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83 Entry current = this;
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84 while (current != null) {
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85 boolean b = value >= current.from;
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86 if (b && value <= current.to) {
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87 return current;
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88 }
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89 current = b
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90 ? current.right
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91 : current.left;
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92 }
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93 return null;
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94 }
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95
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96 public int locate(double value) {
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97 Entry entry = locateEntry(value);
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98 return entry != null
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99 ? entry.index
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100 : -1;
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101 }
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102
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103 public Entry findByIndex(int index) {
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104 Entry current = this;
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105 while (current != null) {
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106 if (current.index == index) {
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107 break;
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108 }
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109 current = index < current.index
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110 ? current.left
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111 : current.right;
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112 }
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113 return current;
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114 }
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115
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116 public String getDescription() {
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117 return description;
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118 }
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119
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120 public boolean isInfinity() {
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121 return from == -Double.MAX_VALUE
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122 || to == Double.MAX_VALUE;
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123 }
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124 } // class Entry
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125
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126 protected Entry [] entries;
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127 protected Entry lookup;
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128 protected Color [] rgbs;
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129
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130 private Entry buildLookup(Entry [] entries, int lo, int hi) {
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131 if (lo > hi) {
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132 return null;
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133 }
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134 int mid = (lo + hi)/2;
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135 Entry entry = entries[mid];
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136 entry.left = buildLookup(entries, lo, mid-1);
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137 entry.right = buildLookup(entries, mid+1, hi);
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138 return entry;
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139 }
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140
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141 public Palette() {
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142 }
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143
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144 public Palette(Document document) {
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145
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146 NodeList rangeNodes = document.getElementsByTagName("range");
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147
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148 entries = new Entry[rangeNodes.getLength()];
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149 rgbs = new Color[entries.length];
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150
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151 for (int i = 0; i < entries.length; ++i) {
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152 Element rangeElement = (Element)rangeNodes.item(i);
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153 double from = doubleValue(rangeElement.getAttribute("from"));
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154 double to = doubleValue(rangeElement.getAttribute("to"));
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155 Color color = color(rangeElement.getAttribute("rgb"));
426
3a0c0ad113d9 Load palettes from configuration.
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156 String desc = rangeElement.getAttribute("description");
424
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157 if (from > to) { double t = from; from = to; to = t; }
426
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158 entries[i] = new Entry(i, from, to, color, desc);
424
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159 rgbs[i] = color;
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160 }
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161
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162 buildLookup();
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163 }
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164
435
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165 public Palette(Palette original, int N) {
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166 if (N < 2) {
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167 throw new IllegalArgumentException("N < 2");
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168 }
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169
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170 Entry [] origEntries = original.entries;
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171
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172 int newSize = 0;
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173 for (int i = 0; i < origEntries.length; ++i) {
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174 // cannot split infinity intervals
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175 newSize += origEntries[i].isInfinity() ? 1 : N;
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176 }
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177
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178 entries = new Entry[newSize];
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179 rgbs = new Color[newSize];
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180
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181 for (int i = 0, j = 0; i < origEntries.length; ++i) {
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182 Entry origEntry = origEntries[i];
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183 if (origEntry.isInfinity()) {
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184 // infinity intervals are just copied
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185 Entry nEntry = new Entry(origEntry);
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186 entries[j] = nEntry;
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187 rgbs[j] = nEntry.color;
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188 nEntry.index = j++;
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189 }
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190 else {
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191 // split interval into N parts
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192 double from = origEntry.from;
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193 double to = origEntry.to;
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194 double delta = (to - from)/N;
447
92b7ccbf6163 Improved generation of iso lines in vertical cross section.
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195 for (int k = 0; k < N; ++k) {
435
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196 Entry nEntry = new Entry(origEntry);
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197 nEntry.from = from;
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198 nEntry.to = from + delta;
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199 from += delta;
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200 entries[j] = nEntry;
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201 rgbs[j] = nEntry.color;
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202 nEntry.index = j++;
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203 }
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204 } // limited interval
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205 } // for all original entries
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206
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207 buildLookup();
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208 }
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209
424
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210 private static final double doubleValue(String s) {
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211 if (s == null || (s = s.trim()).length() == 0) {
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212 return 0d;
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213 }
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214 if ((s = s.toLowerCase()).startsWith("-inf")) {
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diff changeset
215 return -Double.MAX_VALUE; // XXX: Not using Double.NEGATIVE_INFINITY!
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216 }
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217
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218 if (s.startsWith("inf")) {
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219 return Double.MAX_VALUE; // XXX: Not using Double.NEGATIVE_INFINITY!
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220 }
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221
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222 return Double.parseDouble(s);
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223 }
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224
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225 private static final Color color(String s) {
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226 if (s == null || (s = s.trim()).length() == 0) {
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227 return null;
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228 }
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229 return Color.decode(s);
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230 }
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231
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232
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233 protected void buildLookup() {
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234 Arrays.sort(entries);
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diff changeset
235 lookup = buildLookup(entries, 0, entries.length-1);
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236 }
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237
435
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diff changeset
238 public Palette subdivide(int N) {
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diff changeset
239 return new Palette(this, N);
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diff changeset
240 }
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diff changeset
241
424
21fbd254db71 Added support for converting 2D rasters into polygons.
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242 public int getSize() {
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243 return rgbs.length;
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diff changeset
244 }
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245
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246 public Color getColor(int index) {
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247 return rgbs[index];
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diff changeset
248 }
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249
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250 public int indexToRGB(int index) {
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diff changeset
251 return rgbs[index].getRGB();
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diff changeset
252 }
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253
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254 public int toIndex(double value) {
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diff changeset
255 return lookup.locate(value);
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parents:
diff changeset
256 }
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257
21fbd254db71 Added support for converting 2D rasters into polygons.
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diff changeset
258 public Entry getEntry(double value) {
21fbd254db71 Added support for converting 2D rasters into polygons.
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diff changeset
259 return lookup.locateEntry(value);
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diff changeset
260 }
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diff changeset
261
21fbd254db71 Added support for converting 2D rasters into polygons.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
262 public Entry getEntryByIndex(int index) {
21fbd254db71 Added support for converting 2D rasters into polygons.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
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263 return lookup.findByIndex(index);
21fbd254db71 Added support for converting 2D rasters into polygons.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
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264 }
21fbd254db71 Added support for converting 2D rasters into polygons.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
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265 }
21fbd254db71 Added support for converting 2D rasters into polygons.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
266 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8:
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