Mercurial > dive4elements > gnv-client
annotate gnv-artifacts/src/main/java/de/intevation/gnv/raster/Raster.java @ 778:9a828e5a2390
Removed trailing whitespace
gnv-artifacts/trunk@851 c6561f87-3c4e-4783-a992-168aeb5c3f6f
author | Sascha L. Teichmann <sascha.teichmann@intevation.de> |
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date | Mon, 29 Mar 2010 07:58:51 +0000 |
parents | 6e8364e766fa |
children | c4156275c1e1 |
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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 |
495
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195 public double [] getValues() { |
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196 return raster; |
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197 } |
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198 |
424
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199 public int [] toIndexed(ValueToIndex valueToIndex) { |
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200 int [] dst = new int[raster.length]; |
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201 for (int i = 0; i < raster.length; ++i) { |
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202 dst[i] = valueToIndex.toIndex(raster[i]); |
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203 } |
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204 return dst; |
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205 } |
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206 |
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207 public Raster create(Kernel kernel) { |
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208 double [] dst = new double[raster.length]; |
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209 Raster r = new Raster(dst, width); |
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210 r.apply(kernel, continueBorder()); |
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211 return r; |
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212 } |
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213 |
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214 public void apply(Kernel kernel, Access access) { |
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215 int height = getHeight(); |
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216 for (int j = 0; j < height; ++j) { |
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217 int row = j*width; |
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218 for (int i = 0; i < width; ++i) { |
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219 raster[row + i] = kernel.fold(access, i, j); |
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220 } |
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221 } |
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222 } |
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223 |
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224 public Access continueBorder() { |
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225 return new Access() { |
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226 int height = getHeight()-1; |
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227 public double get(int i, int j) { |
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228 if (i < 0) i = 0; |
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229 else if (i >= width) i = width-1; |
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230 if (j < 0) j = 0; |
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231 else if (j > height) j = height; |
21fbd254db71
Added support for converting 2D rasters into polygons.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff
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232 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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changeset
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233 } |
21fbd254db71
Added support for converting 2D rasters into polygons.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff
changeset
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234 }; |
21fbd254db71
Added support for converting 2D rasters into polygons.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff
changeset
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235 } |
21fbd254db71
Added support for converting 2D rasters into polygons.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff
changeset
|
236 } |
21fbd254db71
Added support for converting 2D rasters into polygons.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff
changeset
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237 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8: |