Mercurial > dive4elements > gnv-client

annotate gnv-artifacts/src/main/java/de/intevation/gnv/math/LinearToMap.java @ 1062:58b4a07db856

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Cach improvement: remove the cached elements of each visited state that is visited while stepping back to a previous state. gnv-artifacts/trunk@1147 c6561f87-3c4e-4783-a992-168aeb5c3f6f
author Ingo Weinzierl <ingo.weinzierl@intevation.de>
date Wed, 02 Jun 2010 09:52:39 +0000
parents bb7afd783321
children f953c9a559d8
rev   line source
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1 package de.intevation.gnv.math;
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2
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3 import com.vividsolutions.jts.geom.Coordinate;
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4
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5 import java.util.Iterator;
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6 import java.util.List;
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7 import java.util.NoSuchElementException;
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8
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9 /**
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10 * Given a list of line segments instances of this class are able
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11 * to span a metric system between a start and an end point
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12 * represented as scalar values to 2D coordinate on the
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13 * course of the segments.
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14 *
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15 * @author <a href="mailto:sascha.teichmann@intevation.de">Sascha L. Teichmann</a>
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16 */
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17 public class LinearToMap
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18 {
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19 /**
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20 * Represents a segment of the line string.
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21 */
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22 public static final class Range {
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23 private Range next;
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24
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25 private double from;
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26 private double to;
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27 private double b;
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28
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29 private Coordinate p1;
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30 private Coordinate p2;
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31
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32 private Interpolator interpolator;
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34 /**
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35 * Default constructor.
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36 */
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37 public Range() {
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38 }
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40 /**
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41 * Constructor to create a segment that maps
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42 * a coordinate pair to two scalar values.
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43 * Interpolations inside this segment are done with
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44 * a given interpolator.
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45 * @param from Start point of the segment.
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46 * @param to End point of the segment.
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47 * @param interpolator The interpolator.
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48 * @param p1 The scalar value mapped to the start point.
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49 * @param p2 The scalar value mappend to the end point.
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50 */
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51 public Range(
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52 double from,
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53 double to,
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54 Interpolator interpolator,
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55 Coordinate p1,
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56 Coordinate p2
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57 ) {
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58 this.from = from;
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59 this.to = to;
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60 this.interpolator = interpolator;
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61 this.p1 = p1;
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62 this.p2 = p2;
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63
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64 b = from == to
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65 ? 0d
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66 : 1.0d/(to - from);
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67 }
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68
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69 /**
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70 * Interpolated a coordinate on the segment given a scalar value
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71 * between the start and end point of the range.
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72 * @param x The scalar value.
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73 * @param v The interpolated value is stored here.
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74 */
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75 public void eval(double x, Coordinate v) {
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76 interpolator.interpolate((x - from)*b, v);
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77 }
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78
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79 /**
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80 * Checks if a given value is inside this segment.
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81 * @param x The value to test
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82 * @return true if inside, else false.
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83 */
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84 public boolean inside(double x) {
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85 return x >= from && x <= to;
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86 }
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88 /**
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89 * Returns the start point of this segment.
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90 * @return The start point.
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91 */
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92 public Coordinate startPoint() {
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93 return p1;
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94 }
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96 /**
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97 * Return the end point of this segment.
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98 * @return The end point.
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99 */
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100 public Coordinate endPoint() {
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101 return p2;
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102 }
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103 } // class Range
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104
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105 /**
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106 * The head of the internal range list.
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107 */
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108 protected Range head;
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109
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110 /**
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111 * The last accessed segment. Used to accelerate
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112 * the access of the right segment.
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113 */
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114 protected Range last;
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115
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116 /**
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117 * Default constructor.
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118 */
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119 public LinearToMap() {
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120 }
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121
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122 /**
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123 * Constructor to create a LinearToMap that maps
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124 * given scalar values to coordinates of a given
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125 * list of line segments.
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126 * @param path The list of line segments.
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127 * @param from The start value mapped to the start point
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128 * of the first line segment.
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129 * @param to The end value mapped to the end point of
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130 * the last line segment.
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131 * @param metrics The metric used to span the 2D space.
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132 */
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133 public LinearToMap(
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134 List<? extends Coordinate> path,
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135 double from,
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136 double to,
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137 Metrics metrics
360
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138 ) {
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139 double diagramLength = Math.abs(to - from);
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140
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141 double worldLength = length(path, metrics);
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142
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143 double rangeStart = from;
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144
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145 Range last = null;
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146
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147 for (int i = 1, N = path.size(); i < N; ++i) {
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148 Coordinate p1 = path.get(i-1);
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149 Coordinate p2 = path.get(i);
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150 double segmentLength = metrics.distance(p1, p2);
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151
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152 double relativeLength = segmentLength / worldLength;
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153
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154 double rangeLength = diagramLength * relativeLength;
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155
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156 double rangeEnd = rangeStart + rangeLength;
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157
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158 Range range = new Range(
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159 rangeStart, rangeEnd,
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160 metrics.getInterpolator(p1, p2),
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161 p1, p2);
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162
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163 if (last == null) {
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164 last = head = range;
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165 }
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166 else {
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167 last.next = range;
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168 last = range;
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169 }
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170 rangeStart = rangeEnd;
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171 }
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172 }
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173
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174 /**
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175 * Returns a segment on which a given value is found.
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176 * @param diagramX The value.
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177 * @return The segment or null if no matching segment was found.
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178 */
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179 protected Range locateRange(double diagramX) {
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180
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181 if (last != null && last.inside(diagramX)) {
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182 return last;
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183 }
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184
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185 Range current = head;
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186 while (current != null) {
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187 if (current.inside(diagramX)) {
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188 return last = current;
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189 }
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190 current = current.next;
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191 }
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192
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193 return null;
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194 }
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195
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196 /**
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197 * Interpolates a coordinate at a given scalar position.
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198 * @param diagramX The scalar position.
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199 * @param v The interpolated coordinate is stored here.
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200 * @return true if the scalar position is inside the
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201 * spanned range of the line string, else false.
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202 */
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203 public boolean locate(double diagramX, Coordinate v) {
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204 Range range = locateRange(diagramX);
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205 if (range == null) {
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206 return false;
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207 }
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208 range.eval(diagramX, v);
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209 return true;
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210 }
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211
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212 /**
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213 * Returns the length of a given line string using
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214 * a given metric.
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215 * @param path The line string.
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216 * @param metrics The used metric.
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217 * @return The length of the line string.
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218 */
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219 public static double length(
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220 List<? extends Coordinate> path,
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221 Metrics metrics
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222 ) {
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223 double sum = 0d;
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224 for (int i = path.size()-1; i >= 1; --i) {
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225 Coordinate p1 = path.get(i);
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226 Coordinate p2 = path.get(i-1);
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227 sum += metrics.distance(p1, p2);
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228 }
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229 return sum;
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230 }
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231
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232 /**
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233 * Return the number of segments in this map.
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234 * @return the number of segments.
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235 */
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236 public int numRanges() {
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237 int count = 0;
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238 Range current = head;
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239 while (current != null) {
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240 ++count;
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241 current = current.next;
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242 }
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243 return count;
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244 }
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245
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246 /**
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247 * Returns an iterator over all segments of this map.
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248 * @return The iterator.
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249 */
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250 public Iterator ranges() {
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251 return new Iterator() {
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252
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253 Range current = head;
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254
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255 public boolean hasNext() {
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256 return current != null;
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257 }
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258
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259 public Object next() {
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260 if (!hasNext()) {
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261 throw new NoSuchElementException();
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262 }
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263 Range x = current;
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264 current = current.next;
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265 return x;
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266 }
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267
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268 public void remove() {
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269 throw new UnsupportedOperationException();
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270 }
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271 };
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272 }
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273 }
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274 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 :
http://dive4elements.wald.intevation.org