Mercurial > dive4elements > gnv-client
annotate gnv-artifacts/src/main/java/de/intevation/gnv/raster/Palette.java @ 447:92b7ccbf6163
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> |
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date | Fri, 01 Jan 2010 21:52:41 +0000 |
parents | 7399bb8f83ea |
children | 3cb2bea50456 |
rev | line source |
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424
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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 |
447
92b7ccbf6163
Improved generation of iso lines in vertical cross section.
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11 import org.apache.log4j.Logger; |
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12 |
424
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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 |
424
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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 |
435
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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 |
424
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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 } |
424
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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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144 String desc = rangeElement.getAttribute("description"); |
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145 if (from > to) { double t = from; from = to; to = t; } |
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146 entries[i] = new Entry(i, from, to, color, desc); |
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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; |
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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: |