Mercurial > dive4elements > gnv-client

annotate gnv-artifacts/src/main/java/de/intevation/gnv/math/Point2d.java @ 1115:f953c9a559d8

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Added license file and license headers. gnv-artifacts/trunk@1260 c6561f87-3c4e-4783-a992-168aeb5c3f6f
author Ingo Weinzierl <ingo.weinzierl@intevation.de>
date Tue, 02 Nov 2010 17:46:55 +0000
parents 6cff63d0c434
children
rev   line source
1115
f953c9a559d8 Added license file and license headers.
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1 /*
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2 * Copyright (c) 2010 by Intevation GmbH
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3 *
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4 * This program is free software under the LGPL (>=v2.1)
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5 * Read the file LGPL.txt coming with the software for details
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6 * or visit http://www.gnu.org/licenses/ if it does not exist.
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7 */
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8
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9 package de.intevation.gnv.math;
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10
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11 import com.vividsolutions.jts.geom.Coordinate;
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12 import com.vividsolutions.jts.geom.Envelope;
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13
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14 import java.util.Comparator;
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15
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16 import org.apache.log4j.Logger;
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17
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18 /**
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19 * Point which besides the x, y, z coodinates has an index i, j pair
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20 * to model neighborhood.
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21 * @author <a href="mailto:sascha.teichmann@intevation.de">Sascha L. Teichmann</a>
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22 */
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23 public class Point2d
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24 extends Coordinate
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25 {
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26 private static Logger log = Logger.getLogger(Point2d.class);
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27
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28 /**
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29 * Numerical tolerance epsilon: {@value}
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30 */
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31 public static final double EPSILON = 1e-3d;
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32
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33 /**
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34 * Compares two Point2ds by their x coordinates
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35 */
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36 public static final Comparator X_COMPARATOR = new Comparator() {
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37 public int compare(Object a, Object b) {
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38 double xa = ((Coordinate)a).x;
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39 double xb = ((Coordinate)b).x;
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40 if (xa < xb) return -1;
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41 if (xa > xb) return +1;
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42 return 0;
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43 }
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44 };
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45
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46 /**
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47 * Compares two Point2ds by their y coordinates.
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48 */
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49 public static final Comparator Y_COMPARATOR = new Comparator() {
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50 public int compare(Object a, Object b) {
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51 double ya = ((Coordinate)a).y;
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52 double yb = ((Coordinate)b).y;
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53 if (ya < yb) return -1;
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54 if (ya > yb) return +1;
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55 return 0;
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56 }
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57 };
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58
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59 /**
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60 * The i index of this Point2d.
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61 */
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62 public int i;
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63 /**
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64 * The j index of this Point2d.
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65 */
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66 public int j;
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67
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68 /**
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69 * Default constructor.
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70 */
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71 public Point2d() {
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72 }
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73
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74 /**
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75 * Constructor setting x and y coordinate.
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76 * @param x The x coordinate.
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77 * @param y The y coordinate.
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78 */
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79 public Point2d(double x, double y) {
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80 super(x, y);
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81 }
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82
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83 /**
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84 * Constructor setting x, y and i, j.
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85 * @param x The x coordinate.
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86 * @param y The y coordinate.
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87 * @param i The i index.
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88 * @param j The j index.
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89 */
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90 public Point2d(double x, double y, int i, int j) {
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91 super(x, y);
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92 this.i = i;
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93 this.j = j;
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94 }
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95
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96 /**
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97 * Constructor setting x, y, z and i, j.
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98 * @param x The x coordinate.
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99 * @param y The y coordinate.
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100 * @param z The z coordinate.
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101 * @param i The i index.
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102 * @param j The j index.
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103 */
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104 public Point2d(double x, double y, double z, int i, int j) {
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105 super(x, y, z);
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106 this.i = i;
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107 this.j = j;
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108 }
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109
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110 /**
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111 * Calculates the L1 distance to another Point2d.
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112 * @param other The other Point2d.
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113 * @return The L1 distance.
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114 */
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115 public double L1(Point2d other) {
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116 return L1Comparator.L1(this, other);
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117 }
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118
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119 /**
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120 * Creates an envelope around this Point2d with
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121 * the numerical tolerance of {@link #EPSILON}.
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122 * @return The envelope.
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123 */
361
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124 public Envelope envelope() {
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125 return envelope(EPSILON);
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126 }
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127
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128 /**
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129 *Creates an envelope around this Point2d with
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130 * a given tolerance.
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131 * @param epsilon The tolerance in all directions.
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132 * @return The envelope.
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133 */
361
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134 public Envelope envelope(double epsilon) {
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135 return new Envelope(
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136 x-epsilon, x+epsilon,
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137 y-epsilon, y+epsilon);
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138 }
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139
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140 /**
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141 * Given this and another Point2d it looks if there is
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142 * a gap between the in points in i index direction.
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143 * @param other The other Point2d.
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144 * @return true if there is is a gap, else false.
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145 */
361
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146 public boolean hasIGap(Point2d other) {
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147 return Math.abs(i - other.i) > 1;
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148 }
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149
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150 /**
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151 * Given this and another Point2d it looks if there is
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152 * a gap between the in points in j index direction.
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153 * @param other The other Point2d.
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154 * @return true if there is is a gap, else false.
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155 */
361
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156 public boolean hasJGap(Point2d other) {
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157 return Math.abs(j - other.j) > 1;
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158 }
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159
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160 /**
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161 * Given this and another Point2d a new Point2d is
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162 * created via {@link #newPoint() }. The x, y coordinate
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163 * of the new point is on the line of this and the other
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164 * given point at a given scaling point.
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165 * @param t The scaling factor.
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166 * @param other The other point.
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167 * @return The new Point2d.
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168 */
593
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169 public Point2d extrapolate(double t, Point2d other) {
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170 if (other == null) {
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171 return null;
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172 }
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173 Point2d p = newPoint();
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174 p.x = t*(other.x - x) + x;
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175 p.y = t*(other.y - y) + y;
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176 return p;
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177 }
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178
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179 /**
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180 * Creates a new Point2d or an instance of a subclass.
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181 * Override this in subclasses.
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182 * @return The new Point2d.
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183 */
593
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184 public Point2d newPoint() {
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185 return new Point2d(0d, 0d);
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186 }
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187
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188 /**
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189 * Creates a new Point2d or an instance of a subclass
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190 * at a given coordinate.
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191 * Override this in subclasses.
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192 * @param x The x coordinate.
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193 * @param y The y coordinate.
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194 * @return The new point.
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195 */
593
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196 public Point2d newPoint(double x, double y) {
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197 return new Point2d(x, y);
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198 }
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199
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200 /**
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201 * Sets the z value to the inverse distance weighting (IDW) value
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202 * of the z values of a set of given points.
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203 * @param ps The points from wich the z values are taken
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204 * to calculate the IDW.
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205 */
593
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206 public void inverseDistanceWeighting(Point2d [] ps) {
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207
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208 double sum = 0d;
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209
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210 double [] d = new double[ps.length];
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211
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212 for (int i = 0; i < ps.length; ++i) {
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213 Point2d p = ps[i];
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214 if (p != null) {
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215 double di = distance(p);
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216 if (di < 1e-5d) { z = p.z; return; }
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217 di = 1d/di;
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218 d[i] = di;
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219 sum += di;
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220 }
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221 }
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222
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223 if (sum == 0d) {
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224 return;
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225 }
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226
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227 double v = 0d;
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228
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229 for (int i = 0; i < ps.length; ++i) {
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230 Point2d p = ps[i];
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231 if (p != null) {
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232 v += p.z*d[i];
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233 }
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234 }
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235 z = v/sum;
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236 }
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237
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238 /**
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239 * Creates a new point via {@link #newPoint() } with the
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240 * x,y coordinates of the center of a given set of
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241 * coordinates.
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242 * @param ps The points from which the x,y coordinates are
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243 * taken to calculate the center.
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244 * @return The new center point.
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245 */
593
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246 public static Point2d average(Point2d [] ps) {
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247
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248 Point2d p = null;
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249 int count = 0;
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250
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251 for (int i = 0; i < ps.length; ++i) {
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252 Point2d t = ps[i];
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253 if (t != null) {
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254 ++count;
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255 if (p == null) {
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256 p = t.newPoint(t.x, t.y);
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257 }
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258 else {
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259 p.x += t.x;
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260 p.y += t.y;
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261 }
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262 }
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263 }
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264
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265 if (p != null) {
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266 double s = 1d/count;
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267 p.x *= s;
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268 p.y *= s;
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269 }
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270
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271 return p;
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272 }
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273
798
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274 /**
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275 * Checks if this Point2d is near to at least one point
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276 * out of a given set of points. Near is defined by an
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277 * euclidian distance small than {@link #EPSILON}.
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278 * @param ps The set of points to be tested.
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279 * @return true if this Point2d is near to one of the given
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280 * points, else false.
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281 */
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282 public boolean near(Point2d [] ps) {
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283
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284 for (int i = 0; i < ps.length; ++i) {
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285 Point2d p = ps[i];
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286 if (p != null && distance(p) > EPSILON) {
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287 return false;
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288 }
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289 }
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290
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291 return true;
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292 }
361
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293 }
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294 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 :
http://dive4elements.wald.intevation.org