Mercurial > dive4elements > gnv-client

annotate gnv-artifacts/src/main/java/de/intevation/gnv/math/LinearToMap.java @ 1129:ccfa07b88476

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merged geo-backend
author Thomas Arendsen Hein <thomas@intevation.de>
date Fri, 28 Sep 2012 12:14:01 +0200
parents f953c9a559d8
children
rev   line source
1115
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Ingo Weinzierl <ingo.weinzierl@intevation.de>
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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
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13 import java.util.Iterator;
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14 import java.util.List;
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15 import java.util.NoSuchElementException;
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16
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17 /**
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18 * Given a list of line segments instances of this class are able
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19 * to span a metric system between a start and an end point
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20 * represented as scalar values to 2D coordinate on the
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21 * course of the segments.
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22 *
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23 * @author <a href="mailto:sascha.teichmann@intevation.de">Sascha L. Teichmann</a>
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24 */
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25 public class LinearToMap
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26 {
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27 /**
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28 * Represents a segment of the line string.
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29 */
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30 public static final class Range {
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31 private Range next;
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32
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33 private double from;
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34 private double to;
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35 private double b;
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36
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37 private Coordinate p1;
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38 private Coordinate p2;
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39
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40 private Interpolator interpolator;
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41
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42 /**
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43 * Default constructor.
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44 */
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45 public Range() {
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46 }
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47
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48 /**
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49 * Constructor to create a segment that maps
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50 * a coordinate pair to two scalar values.
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51 * Interpolations inside this segment are done with
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52 * a given interpolator.
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53 * @param from Start point of the segment.
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54 * @param to End point of the segment.
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55 * @param interpolator The interpolator.
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56 * @param p1 The scalar value mapped to the start point.
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57 * @param p2 The scalar value mappend to the end point.
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58 */
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59 public Range(
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60 double from,
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61 double to,
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62 Interpolator interpolator,
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63 Coordinate p1,
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64 Coordinate p2
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65 ) {
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66 this.from = from;
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67 this.to = to;
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68 this.interpolator = interpolator;
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69 this.p1 = p1;
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70 this.p2 = p2;
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71
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72 b = from == to
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73 ? 0d
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74 : 1.0d/(to - from);
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75 }
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76
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77 /**
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78 * Interpolated a coordinate on the segment given a scalar value
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79 * between the start and end point of the range.
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80 * @param x The scalar value.
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81 * @param v The interpolated value is stored here.
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82 */
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83 public void eval(double x, Coordinate v) {
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84 interpolator.interpolate((x - from)*b, v);
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85 }
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86
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87 /**
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88 * Checks if a given value is inside this segment.
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89 * @param x The value to test
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90 * @return true if inside, else false.
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91 */
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92 public boolean inside(double x) {
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93 return x >= from && x <= to;
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94 }
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95
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96 /**
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97 * Returns the start point of this segment.
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98 * @return The start point.
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99 */
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100 public Coordinate startPoint() {
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101 return p1;
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102 }
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103
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104 /**
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105 * Return the end point of this segment.
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106 * @return The end point.
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107 */
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108 public Coordinate endPoint() {
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109 return p2;
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110 }
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111 } // class Range
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112
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113 /**
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114 * The head of the internal range list.
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115 */
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116 protected Range head;
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117
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118 /**
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119 * The last accessed segment. Used to accelerate
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120 * the access of the right segment.
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121 */
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122 protected Range last;
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123
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124 /**
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125 * Default constructor.
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126 */
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127 public LinearToMap() {
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128 }
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129
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130 /**
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131 * Constructor to create a LinearToMap that maps
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132 * given scalar values to coordinates of a given
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133 * list of line segments.
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134 * @param path The list of line segments.
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135 * @param from The start value mapped to the start point
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136 * of the first line segment.
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137 * @param to The end value mapped to the end point of
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138 * the last line segment.
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139 * @param metrics The metric used to span the 2D space.
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140 */
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141 public LinearToMap(
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142 List<? extends Coordinate> path,
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143 double from,
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144 double to,
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145 Metrics metrics
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146 ) {
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147 double diagramLength = Math.abs(to - from);
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148
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149 double worldLength = length(path, metrics);
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150
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151 double rangeStart = from;
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152
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153 Range last = null;
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154
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155 for (int i = 1, N = path.size(); i < N; ++i) {
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156 Coordinate p1 = path.get(i-1);
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157 Coordinate p2 = path.get(i);
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158 double segmentLength = metrics.distance(p1, p2);
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159
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160 double relativeLength = segmentLength / worldLength;
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161
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162 double rangeLength = diagramLength * relativeLength;
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163
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164 double rangeEnd = rangeStart + rangeLength;
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165
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166 Range range = new Range(
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167 rangeStart, rangeEnd,
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168 metrics.getInterpolator(p1, p2),
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169 p1, p2);
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170
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171 if (last == null) {
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172 last = head = range;
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173 }
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174 else {
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175 last.next = range;
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176 last = range;
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177 }
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178 rangeStart = rangeEnd;
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179 }
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180 }
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181
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182 /**
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183 * Returns a segment on which a given value is found.
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184 * @param diagramX The value.
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185 * @return The segment or null if no matching segment was found.
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186 */
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187 protected Range locateRange(double diagramX) {
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188
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189 if (last != null && last.inside(diagramX)) {
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190 return last;
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191 }
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192
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193 Range current = head;
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194 while (current != null) {
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195 if (current.inside(diagramX)) {
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196 return last = current;
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197 }
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198 current = current.next;
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199 }
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200
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201 return null;
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202 }
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203
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204 /**
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205 * Interpolates a coordinate at a given scalar position.
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206 * @param diagramX The scalar position.
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207 * @param v The interpolated coordinate is stored here.
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208 * @return true if the scalar position is inside the
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209 * spanned range of the line string, else false.
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210 */
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211 public boolean locate(double diagramX, Coordinate v) {
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212 Range range = locateRange(diagramX);
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213 if (range == null) {
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214 return false;
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215 }
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216 range.eval(diagramX, v);
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217 return true;
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218 }
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219
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220 /**
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221 * Returns the length of a given line string using
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222 * a given metric.
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223 * @param path The line string.
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224 * @param metrics The used metric.
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225 * @return The length of the line string.
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226 */
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227 public static double length(
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228 List<? extends Coordinate> path,
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229 Metrics metrics
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230 ) {
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231 double sum = 0d;
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232 for (int i = path.size()-1; i >= 1; --i) {
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233 Coordinate p1 = path.get(i);
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234 Coordinate p2 = path.get(i-1);
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235 sum += metrics.distance(p1, p2);
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236 }
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237 return sum;
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238 }
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239
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240 /**
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241 * Return the number of segments in this map.
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242 * @return the number of segments.
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243 */
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244 public int numRanges() {
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245 int count = 0;
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246 Range current = head;
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247 while (current != null) {
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248 ++count;
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249 current = current.next;
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250 }
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251 return count;
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252 }
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253
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254 /**
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255 * Returns an iterator over all segments of this map.
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256 * @return The iterator.
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257 */
360
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258 public Iterator ranges() {
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259 return new Iterator() {
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260
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261 Range current = head;
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262
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263 public boolean hasNext() {
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264 return current != null;
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265 }
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266
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267 public Object next() {
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268 if (!hasNext()) {
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269 throw new NoSuchElementException();
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270 }
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271 Range x = current;
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272 current = current.next;
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273 return x;
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274 }
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275
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276 public void remove() {
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277 throw new UnsupportedOperationException();
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278 }
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279 };
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280 }
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281 }
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282 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 :
http://dive4elements.wald.intevation.org