Mercurial > dive4elements > gnv-client

annotate gnv-artifacts/src/main/java/de/intevation/gnv/raster/Palette.java @ 424:21fbd254db71

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Added support for converting 2D rasters into polygons. gnv-artifacts/trunk@472 c6561f87-3c4e-4783-a992-168aeb5c3f6f
author Sascha L. Teichmann <sascha.teichmann@intevation.de>
date Mon, 21 Dec 2009 18:00:54 +0000
parents
children 3a0c0ad113d9
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(
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38 int index,
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39 double from,
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40 double to,
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41 Color color,
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42 String description
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43 ) {
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44 this.index = index;
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45 this.from = from;
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46 this.to = to;
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47 this.color = color;
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48 this.description = description;
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49 }
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50
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51 public int compareTo(Object other) {
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52 Entry e = (Entry)other;
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53 if (from < e.from) return -1;
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54 if (from > e.from) return +1;
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55 return 0;
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56 }
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57
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58 public Entry locateEntry(double value) {
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59 Entry current = this;
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60 while (current != null) {
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61 boolean b = value >= current.from;
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62 if (b && value <= current.to) {
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63 return current;
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64 }
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65 current = b
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66 ? current.right
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67 : current.left;
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68 }
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69 return null;
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70 }
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71
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72 public int locate(double value) {
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73 Entry entry = locateEntry(value);
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74 return entry != null
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75 ? entry.index
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76 : -1;
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77 }
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78
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79 public Entry findByIndex(int index) {
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80 Entry current = this;
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81 while (current != null) {
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82 if (current.index == index) {
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83 break;
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84 }
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85 current = index < current.index
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86 ? current.left
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87 : current.right;
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88 }
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89 return current;
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90 }
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91
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92 public String getDescription() {
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93 return description;
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94 }
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95 } // class Entry
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96
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97 protected Entry [] entries;
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98 protected Entry lookup;
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99 protected Color [] rgbs;
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100
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101 private Entry buildLookup(Entry [] entries, int lo, int hi) {
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102 if (lo > hi) {
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103 return null;
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104 }
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105 int mid = (lo + hi)/2;
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106 Entry entry = entries[mid];
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107 entry.left = buildLookup(entries, lo, mid-1);
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108 entry.right = buildLookup(entries, mid+1, hi);
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109 return entry;
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110 }
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111
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112 public Palette() {
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113 }
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114
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115 public Palette(Document document) {
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116
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117 NodeList rangeNodes = document.getElementsByTagName("range");
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118
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119 entries = new Entry[rangeNodes.getLength()];
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120 rgbs = new Color[entries.length];
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121
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122 for (int i = 0; i < entries.length; ++i) {
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123 Element rangeElement = (Element)rangeNodes.item(i);
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124 double from = doubleValue(rangeElement.getAttribute("from"));
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125 double to = doubleValue(rangeElement.getAttribute("to"));
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126 Color color = color(rangeElement.getAttribute("rgb"));
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127 String description = rangeElement.getAttribute("description");
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128 if (from > to) { double t = from; from = to; to = t; }
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129 entries[i] = new Entry(i, from, to, color, description);
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130 rgbs[i] = color;
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131 }
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132
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133 buildLookup();
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134 }
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135
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136 private static final double doubleValue(String s) {
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137 if (s == null || (s = s.trim()).length() == 0) {
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138 return 0d;
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139 }
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140 if ((s = s.toLowerCase()).startsWith("-inf")) {
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141 return -Double.MAX_VALUE; // XXX: Not using Double.NEGATIVE_INFINITY!
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142 }
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143
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144 if (s.startsWith("inf")) {
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145 return Double.MAX_VALUE; // XXX: Not using Double.NEGATIVE_INFINITY!
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146 }
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147
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148 return Double.parseDouble(s);
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149 }
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150
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151 private static final Color color(String s) {
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152 if (s == null || (s = s.trim()).length() == 0) {
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153 return null;
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154 }
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155 return Color.decode(s);
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156 }
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157
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158
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159 protected void buildLookup() {
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160 Arrays.sort(entries);
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161 lookup = buildLookup(entries, 0, entries.length-1);
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162 }
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163
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164 public int getSize() {
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165 return rgbs.length;
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166 }
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167
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168 public Color getColor(int index) {
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169 return rgbs[index];
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170 }
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171
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172 public int indexToRGB(int index) {
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173 return rgbs[index].getRGB();
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174 }
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175
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176 public int toIndex(double value) {
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177 return lookup.locate(value);
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178 }
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179
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180 public Entry getEntry(double value) {
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181 return lookup.locateEntry(value);
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182 }
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183
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184 public Entry getEntryByIndex(int index) {
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185 return lookup.findByIndex(index);
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186 }
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187 }
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188 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8:
http://dive4elements.wald.intevation.org