Mercurial > dive4elements > gnv-client

annotate gnv-artifacts/src/main/java/de/intevation/gnv/raster/Raster.java @ 819:6925d18580c0

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Added more Javadoc. gnv-artifacts/trunk@905 c6561f87-3c4e-4783-a992-168aeb5c3f6f
author Tim Englich <tim.englich@intevation.de>
date Mon, 12 Apr 2010 13:12:21 +0000
parents d766fe2d917a
children 05bf8534a35a
rev   line source
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1 package de.intevation.gnv.raster;
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2
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3 /**
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4 * A 2D double valued representation of a raster array.
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5 * @author <a href="mailto:sascha.teichmann@intevation.de">Sascha L. Teichmann</a>
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6 */
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7 public class Raster
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8 {
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9 /**
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10 * A kernel can be applied to a raster to fold its values.
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11 */
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12 public static class Kernel {
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13
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14 /**
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15 * The coefficients of the folding matrix.
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16 */
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17 public static final class Coeff {
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18 /**
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19 * i delta index of this coefficient.
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20 */
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21 public int di;
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22 /**
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23 * i delta index of this coefficient.
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24 */
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25 public int dj;
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26 /**
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27 * The weight of this coefficient.
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28 */
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29 public double c;
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30
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31 /**
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32 * Default constructor
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33 */
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34 public Coeff() {
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35 }
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36
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37 /**
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38 * Constructor to set the delta position and the weight of
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39 * the coefficient.
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40 * @param di The i delta index.
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41 * @param dj The j delta index.
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42 * @param c The weight of the index.
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43 */
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44 public Coeff(int di, int dj, double c) {
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45 this.di = di;
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46 this.dj = dj;
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47 this.c = c;
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48 }
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49
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50 /**
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51 * Returns a string representation of this coefficient.
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52 * @return The string representation.
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53 */
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54 @Override
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55 public String toString() {
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56 return String.valueOf(c);
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57 }
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58
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59 } // class Coeff
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60
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61 /**
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62 * The coefficients of the folding matrix.
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63 */
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64 protected Coeff [] coeffs;
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65 /**
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66 * The width of the kernel.
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67 */
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68 protected int width;
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69
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70 /**
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71 * Default constrcutor.
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72 */
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73 public Kernel() {
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74 }
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75
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76 /**
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77 * Constructor for a kernel with a given coefficient matrix
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78 * with a given width.
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79 * @param coeffs The coefficients.
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80 * @param width The width of the kernel.
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81 */
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82 public Kernel(Coeff [] coeffs, int width) {
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83 this.coeffs = coeffs;
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84 this.width = width;
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85 }
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86
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87 /**
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88 * Evaluates the 2D Gauss normal distribution a given x, y
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89 * and a given sigma.
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90 * @param x The x location.
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91 * @param y The y location.
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92 * @param sigma The sigma of the distribution.
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93 * @return The value at point x, y.
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94 */
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95 public static double gauss(double x, double y, double sigma) {
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96 double s2 = sigma*sigma;
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97 return 1.0d/(2.0d*Math.PI*s2)*Math.exp(-(x*x + y*y)/(2.0d*s2));
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98 }
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99
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100 /**
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101 * Creates a Gauss kernel with sigma = 1 and width 5.
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102 * @return The new kernel.
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103 */
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104 public static Kernel createGauss() {
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105 return createGauss(1.0d, 5);
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106 }
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107
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108 /**
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109 * Creates a Gauss kernel with a given sigma and width.
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110 * @param sigma The sigma value
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111 * @param width The width of the kernel.
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112 * @return The new kernel.
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113 */
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114 public static Kernel createGauss(double sigma, int width) {
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115 Coeff [] coeffs = new Coeff[width*width];
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116 double sum = 0d;
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117 for (int j = 0; j < width; ++j) {
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118 int y = -width/2 + j;
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119 for (int i = 0; i < width; ++i) {
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120 int x = -width/2 + i;
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121 double c = gauss(x, y, sigma);
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122 coeffs[j*width + i] = new Coeff(x, y, c);
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123 sum += c;
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124 }
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125 }
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126 sum = 1.0/sum;
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127 for (int i = 0; i < coeffs.length; ++i) {
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128 coeffs[i].c *= sum;
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129 }
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130 return new Kernel(coeffs, width);
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131 }
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132
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133 /**
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134 * Evaluates this Kernel at the raster at raster index i, j.
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135 * @param access The accessor to the raster.
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136 * @param i The i raster index.
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137 * @param j The j raster index.
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138 * @return The folded value at index i, j.
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139 */
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140 public double fold(Access access, int i, int j) {
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141
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142 double s = 0.0d;
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143
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144 double unused = 0d;
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145
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146 for (int k = 0; k < coeffs.length; ++k) {
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147 Coeff coeff = coeffs[k];
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148 double v = access.get(i + coeff.di, j + coeff.dj);
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149 if (Double.isNaN(v)) {
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150 unused += coeff.c;
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151 }
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152 else {
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153 s += v * coeff.c;
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154 }
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155 }
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156
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157 return s*(1.0d - unused);
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158 }
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159
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160 /**
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161 * Returns a string representation of this kernel.
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162 * @return The string representation.
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163 */
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164 @Override
424
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165 public String toString() {
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166 StringBuilder sb = new StringBuilder();
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167
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168 int height = coeffs.length/width;
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169
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170 for (int j = 0; j < height; ++j) {
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171 if (j > 0) {
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172 sb.append(System.getProperty("line.separator"));
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173 }
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174 for (int i = 0; i < width; ++i) {
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175 if (i > 0) {
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176 sb.append("\t");
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177 }
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178 sb.append(coeffs[j*width + i]);
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179 }
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180 }
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181
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182 return sb.toString();
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183 }
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184 } // class Kernel
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185
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186 /**
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187 * Interface of allow special access patterns to the raster,
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188 * especially at the border.
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189 */
424
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190 public interface Access {
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191
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192 /**
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193 * Returns the raster value at a given index point.
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194 * @param i The i index
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195 * @param j The j index
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196 * @return The value of the raster.
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197 */
424
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198 double get(int i, int j);
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199
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200 } // interface Access
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201
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202 /**
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203 * Interface to decouple the lookup which is needed
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204 * to map double values to integers.
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205 */
424
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206 public interface ValueToIndex {
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207
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208 /**
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209 * Returns the corresponding integer to a given value.
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210 * @param value The value to be queried.
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211 * @return The integer value or -1 if no such value was found.
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212 */
424
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213 int toIndex(double value);
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214
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215 } // interface ValueToIndex;
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216
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217 /**
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218 * Brings raster to an integer representation with equal sized bins
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219 * of integer vaules.
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220 */
424
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221 public static class IsoClasses
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222 implements ValueToIndex
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223 {
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224 /**
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225 * Linear scaling factor.
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226 */
424
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227 protected double m;
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228 /**
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229 * Linear offset.
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230 */
424
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231 protected double b;
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232 /**
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233 * Number of classes.
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234 */
424
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235 protected int numClasses;
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236
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237 /**
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238 * Constructor to build a lookup to transform
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239 * an raster into an equals sized bin integer array.
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240 * @param raster The original raster
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241 * @param numClasses The number of classes.
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242 */
424
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243 public IsoClasses(Raster raster, int numClasses) {
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244
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245 this.numClasses = numClasses;
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246
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247 double min = Double.MAX_VALUE;
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248 double max = -Double.MAX_VALUE;
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249
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250 double [] src = raster.raster;
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251
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252 for (int i = 0; i < src.length; ++i) {
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253 double x = src[i];
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254 if (!Double.isNaN(x)) {
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255 if (x < min) min = x;
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256 if (x > max) max = x;
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257 }
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258 }
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259
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260 /* f(min) = 0, f(max) = numClasses - 1
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261
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262 I: 0 = m*min + b
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263 II: numClasses - 1 = m*max + b
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264
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265 II - I:
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266 numClasses - 1 = m*(max - min)
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267
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268 m = (numClasses - 1)/(max - min)
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269 b = m*min
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270 */
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271
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272 if (max == min) {
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273 m = 0;
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274 b = 0;
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275 }
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276 else {
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277 m = (numClasses - 1)/(max - min);
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278 b = m*min;
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279 }
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280 }
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281
801
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282 /**
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283 * Implements the double to integer lookup.
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284 * @param value The value to map.
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285 * @return The mapped value.
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286 */
424
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287 public int toIndex(double value) {
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288 return Double.isNaN(value)
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289 ? -1
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290 : Math.min(Math.max(0, (int)Math.round(m*value + b)), numClasses-1);
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291 }
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292 } // class IsoClasses
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293
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294 /**
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295 * Internal representation of the raster.
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296 */
424
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297 protected double [] raster;
801
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298 /**
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299 * The width of the raster.
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300 */
424
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301 protected int width;
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302
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303 /**
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304 * Default constructor. Creates an 0x0 raster.
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305 */
424
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306 public Raster() {
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307 this(new double[0], 0);
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308 }
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309
801
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310 /**
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311 * Creates a raster with given values and width.
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312 * @param raster
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313 * @param width
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314 */
424
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315 public Raster(double [] raster, int width) {
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316 this.raster = raster;
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317 this.width = width;
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318 }
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319
801
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320 /**
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321 * The width of the raster.
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322 * @return The width.
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323 */
424
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324 public int getWidth() {
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325 return width;
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326 }
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327
801
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328 /**
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329 * The height of the raster.
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330 * @return The height.
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331 */
424
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332 public int getHeight() {
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333 return raster.length / width;
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334 }
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335
801
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336 /**
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337 * The values of the raster.
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338 * @return The values.
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339 */
495
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340 public double [] getValues() {
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341 return raster;
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342 }
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343
801
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344 /**
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345 * Creates an integer representation of this raster using a
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346 * given value to index transformer.
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347 * @param valueToIndex The transformer to map double to integer values.
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348 * @return The new created integer representation.
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349 */
424
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350 public int [] toIndexed(ValueToIndex valueToIndex) {
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351 int [] dst = new int[raster.length];
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352 for (int i = 0; i < raster.length; ++i) {
21fbd254db71 Added support for converting 2D rasters into polygons.
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353 dst[i] = valueToIndex.toIndex(raster[i]);
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354 }
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355 return dst;
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356 }
21fbd254db71 Added support for converting 2D rasters into polygons.
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357
801
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358 /**
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359 * Creates a new raster by applying a kernel to this raster.
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360 * Access to the raster is continuous at the border.
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361 * The original raster is not modified.
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362 * @param kernel The kernel to be applied.
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363 * @return The new raster.
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364 */
424
21fbd254db71 Added support for converting 2D rasters into polygons.
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365 public Raster create(Kernel kernel) {
21fbd254db71 Added support for converting 2D rasters into polygons.
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366 double [] dst = new double[raster.length];
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367 Raster r = new Raster(dst, width);
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368 r.apply(kernel, continueBorder());
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369 return r;
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370 }
21fbd254db71 Added support for converting 2D rasters into polygons.
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371
801
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372 /**
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373 * Creates a new raster by applying a kernel to this raster.
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374 * Access to the raster is given.
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375 * @param kernel The kernel to be applied.
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376 * @param access The access method to the raster.
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377 */
424
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378 public void apply(Kernel kernel, Access access) {
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379 int height = getHeight();
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diff changeset
380 for (int j = 0; j < height; ++j) {
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381 int row = j*width;
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382 for (int i = 0; i < width; ++i) {
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383 raster[row + i] = kernel.fold(access, i, j);
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parents:
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384 }
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parents:
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385 }
21fbd254db71 Added support for converting 2D rasters into polygons.
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parents:
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386 }
21fbd254db71 Added support for converting 2D rasters into polygons.
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387
801
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388 /**
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389 * Returns a continuous access to the raster. Values
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390 * at the border are repeated til infinity if indices
d766fe2d917a More javadoc.
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391 * are accessed outside the defined area.
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392 * @return The accessor.
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393 */
424
21fbd254db71 Added support for converting 2D rasters into polygons.
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parents:
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394 public Access continueBorder() {
21fbd254db71 Added support for converting 2D rasters into polygons.
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parents:
diff changeset
395 return new Access() {
21fbd254db71 Added support for converting 2D rasters into polygons.
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parents:
diff changeset
396 int height = getHeight()-1;
21fbd254db71 Added support for converting 2D rasters into polygons.
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397 public double get(int i, int j) {
21fbd254db71 Added support for converting 2D rasters into polygons.
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parents:
diff changeset
398 if (i < 0) i = 0;
21fbd254db71 Added support for converting 2D rasters into polygons.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
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399 else if (i >= width) i = width-1;
21fbd254db71 Added support for converting 2D rasters into polygons.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
400 if (j < 0) j = 0;
21fbd254db71 Added support for converting 2D rasters into polygons.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
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401 else if (j > height) j = height;
21fbd254db71 Added support for converting 2D rasters into polygons.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
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402 return raster[j*width + i];
21fbd254db71 Added support for converting 2D rasters into polygons.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
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403 }
21fbd254db71 Added support for converting 2D rasters into polygons.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
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404 };
21fbd254db71 Added support for converting 2D rasters into polygons.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
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405 }
21fbd254db71 Added support for converting 2D rasters into polygons.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
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406 }
801
d766fe2d917a More javadoc.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 798
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407 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 :
http://dive4elements.wald.intevation.org