Mercurial > dive4elements > gnv-client

annotate gnv-artifacts/src/main/java/de/intevation/gnv/raster/Raster.java @ 483:c8089cd7d777

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Added explicit index scheme to palette classes to allow external references. gnv-artifacts/trunk@558 c6561f87-3c4e-4783-a992-168aeb5c3f6f
author Sascha L. Teichmann <sascha.teichmann@intevation.de>
date Mon, 18 Jan 2010 10:56:41 +0000
parents 21fbd254db71
children 6e8364e766fa
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 /**
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4 * @author Sascha L. Teichmann (sascha.teichmann@intevation.de)
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5 */
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6 public class Raster
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7 {
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8 public static class Kernel {
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9
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10 public static final class Coeff {
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11 public int di;
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12 public int dj;
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13 public double c;
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14
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15 public Coeff() {
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16 }
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17
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18 public Coeff(int di, int dj, double c) {
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19 this.di = di;
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20 this.dj = dj;
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21 this.c = c;
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22 }
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23
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24 public String toString() {
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25 return String.valueOf(c);
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26 }
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27
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28 } // class Coeff
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29
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30 protected Coeff [] coeffs;
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31 protected int width;
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32
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33 public Kernel() {
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34 }
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35
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36 public Kernel(Coeff [] coeffs, int width) {
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37 this.coeffs = coeffs;
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38 this.width = width;
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39 }
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40
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41 public static double gauss(double x, double y, double sigma) {
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42 double s2 = sigma*sigma;
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43 return 1.0d/(2.0d*Math.PI*s2)*Math.exp(-(x*x + y*y)/(2.0d*s2));
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44 }
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45
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46 public static Kernel createGauss() {
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47 return createGauss(1.0d, 5);
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48 }
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49
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50 public static Kernel createGauss(double sigma, int width) {
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51 Coeff [] coeffs = new Coeff[width*width];
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52 double sum = 0d;
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53 for (int j = 0; j < width; ++j) {
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54 int y = -width/2 + j;
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55 for (int i = 0; i < width; ++i) {
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56 int x = -width/2 + i;
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57 double c = gauss(x, y, sigma);
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58 coeffs[j*width + i] = new Coeff(x, y, c);
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59 sum += c;
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60 }
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61 }
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62 sum = 1.0/sum;
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63 for (int i = 0; i < coeffs.length; ++i) {
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64 coeffs[i].c *= sum;
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65 }
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66 return new Kernel(coeffs, width);
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67 }
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68
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69 public double fold(Access access, int i, int j) {
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70
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71 double s = 0.0d;
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72
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73 double unused = 0d;
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74
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75 for (int k = 0; k < coeffs.length; ++k) {
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76 Coeff coeff = coeffs[k];
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77 double v = access.get(i + coeff.di, j + coeff.dj);
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78 if (Double.isNaN(v)) {
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79 unused += coeff.c;
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80 }
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81 else {
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82 s += v * coeff.c;
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83 }
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84 }
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85
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86 return s*(1.0d - unused);
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87 }
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88
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89 public String toString() {
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90 StringBuilder sb = new StringBuilder();
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91
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92 int height = coeffs.length/width;
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93
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94 for (int j = 0; j < height; ++j) {
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95 if (j > 0) {
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96 sb.append(System.getProperty("line.separator"));
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97 }
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98 for (int i = 0; i < width; ++i) {
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99 if (i > 0) {
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100 sb.append("\t");
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101 }
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102 sb.append(coeffs[j*width + i]);
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103 }
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104 }
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105
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106 return sb.toString();
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107 }
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108 } // class Kernel
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109
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110 public interface Access {
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111
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112 double get(int i, int j);
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113
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114 } // interface Access
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115
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116 public interface ValueToIndex {
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117
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118 int toIndex(double value);
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119
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120 } // interface ValueToIndex;
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121
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122 public static class IsoClasses
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123 implements ValueToIndex
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124 {
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125 protected double m;
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126 protected double b;
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127 protected int numClasses;
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128
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129 public IsoClasses(Raster raster, int numClasses) {
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130
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131 this.numClasses = numClasses;
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132
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133 double min = Double.MAX_VALUE;
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134 double max = -Double.MAX_VALUE;
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135
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136 double [] src = raster.raster;
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137
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138 for (int i = 0; i < src.length; ++i) {
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139 double x = src[i];
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140 if (!Double.isNaN(x)) {
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141 if (x < min) min = x;
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142 if (x > max) max = x;
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143 }
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144 }
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145
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146 /* f(min) = 0, f(max) = numClasses - 1
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147
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148 I: 0 = m*min + b
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149 II: numClasses - 1 = m*max + b
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150
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151 II - I:
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152 numClasses - 1 = m*(max - min)
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153
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154 m = (numClasses - 1)/(max - min)
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155 b = m*min
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156 */
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157
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158 if (max == min) {
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159 m = 0;
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160 b = 0;
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161 }
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162 else {
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163 m = (numClasses - 1)/(max - min);
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164 b = m*min;
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165 }
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166 }
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167
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168 public int toIndex(double value) {
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169 return Double.isNaN(value)
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170 ? -1
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171 : Math.min(Math.max(0, (int)Math.round(m*value + b)), numClasses-1);
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172 }
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173 } // class IsoClasses
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174
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175 protected double [] raster;
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176 protected int width;
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177
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178 public Raster() {
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179 this(new double[0], 0);
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180 }
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181
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182 public Raster(double [] raster, int width) {
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183 this.raster = raster;
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184 this.width = width;
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185 }
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186
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187 public int getWidth() {
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188 return width;
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189 }
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190
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191 public int getHeight() {
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192 return raster.length / width;
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193 }
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194
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195 public int [] toIndexed(ValueToIndex valueToIndex) {
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196 int [] dst = new int[raster.length];
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197 for (int i = 0; i < raster.length; ++i) {
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198 dst[i] = valueToIndex.toIndex(raster[i]);
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199 }
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200 return dst;
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201 }
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202
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203 public Raster create(Kernel kernel) {
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204 double [] dst = new double[raster.length];
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205 Raster r = new Raster(dst, width);
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206 r.apply(kernel, continueBorder());
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207 return r;
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208 }
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209
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210 public void apply(Kernel kernel, Access access) {
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211 int height = getHeight();
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212 for (int j = 0; j < height; ++j) {
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213 int row = j*width;
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214 for (int i = 0; i < width; ++i) {
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215 raster[row + i] = kernel.fold(access, i, j);
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216 }
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217 }
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218 }
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219
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220 public Access continueBorder() {
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221 return new Access() {
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222 int height = getHeight()-1;
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223 public double get(int i, int j) {
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224 if (i < 0) i = 0;
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225 else if (i >= width) i = width-1;
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226 if (j < 0) j = 0;
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227 else if (j > height) j = height;
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228 return raster[j*width + i];
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229 }
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230 };
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231 }
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232 }
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233 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8:
http://dive4elements.wald.intevation.org