Mercurial > dive4elements > gnv-client

annotate gnv-artifacts/src/main/java/de/intevation/gnv/raster/Palette.java @ 605:e8ebdbc7f1e3

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First step of removing the cache blob. The static part of the describe document will be created by using the input data stored at each state. Some TODOs left (see ChangeLog). gnv-artifacts/trunk@671 c6561f87-3c4e-4783-a992-168aeb5c3f6f
author Ingo Weinzierl <ingo.weinzierl@intevation.de>
date Tue, 09 Feb 2010 14:27:55 +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);
483
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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
92b7ccbf6163 Improved generation of iso lines in vertical cross section.
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diff changeset
205 for (int k = 0; k < N; ++k) {
435
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diff changeset
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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diff changeset
209 from += delta;
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diff changeset
210 entries[j] = nEntry;
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diff changeset
211 rgbs[j] = nEntry.color;
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diff changeset
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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diff changeset
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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diff changeset
222 return def;
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diff changeset
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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diff changeset
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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diff changeset
230 return def;
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diff changeset
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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parents:
diff changeset
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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parents:
diff changeset
239 }
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parents:
diff changeset
240
21fbd254db71 Added support for converting 2D rasters into polygons.
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parents:
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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diff changeset
243 }
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parents:
diff changeset
244
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245 return Double.parseDouble(s);
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parents:
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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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parents:
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253 }
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parents:
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254
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parents:
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255
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256 protected void buildLookup() {
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diff changeset
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