Mercurial > dive4elements > gnv-client

annotate gnv-artifacts/src/main/java/de/intevation/gnv/math/LinearToMap.java @ 773:5fb1ea68e19c

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Avoid danger to get a NullPointerException if no time to live is served by CallContext. gnv-artifacts/trunk@832 c6561f87-3c4e-4783-a992-168aeb5c3f6f
author Ingo Weinzierl <ingo.weinzierl@intevation.de>
date Fri, 26 Mar 2010 09:55:28 +0000
parents aec85d00d82c
children 9a828e5a2390
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.List;
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6 import java.util.Iterator;
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7 import java.util.NoSuchElementException;
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8
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9 /**
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10 * @author Sascha L. Teichmann
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11 */
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12 public class LinearToMap
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13 {
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14 public static final class Range {
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15 private Range next;
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16
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17 private double from;
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18 private double to;
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19 private double b;
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20
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21 private Coordinate p1;
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22 private Coordinate p2;
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23
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24 private Interpolator interpolator;
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25
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26 public Range() {
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27 }
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28
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29 public Range(
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30 double from,
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31 double to,
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32 Interpolator interpolator,
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33 Coordinate p1,
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34 Coordinate p2
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35 ) {
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36 this.from = from;
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37 this.to = to;
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38 this.interpolator = interpolator;
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39 this.p1 = p1;
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40 this.p2 = p2;
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41
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42 b = from == to
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43 ? 0d
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44 : 1.0d/(to - from);
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45 }
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46
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47 public void eval(double x, Coordinate v) {
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48 interpolator.interpolate((x - from)*b, v);
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49 }
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50
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51 public boolean inside(double x) {
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52 return x >= from && x <= to;
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53 }
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54
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55 public Coordinate startPoint() {
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56 return p1;
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57 }
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58
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59 public Coordinate endPoint() {
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60 return p2;
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61 }
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62 } // class Range
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63
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64 protected Range head;
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65 protected Range last;
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66
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67 public LinearToMap() {
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68 }
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69
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70 public LinearToMap(
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71 List<? extends Coordinate> path,
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72 double from,
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73 double to,
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74 Metrics metrics
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75 ) {
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76 double diagramLength = Math.abs(to - from);
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77
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78 double worldLength = length(path, metrics);
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79
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80 double rangeStart = from;
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81
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82 Range last = null;
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83
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84 for (int i = 1, N = path.size(); i < N; ++i) {
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85 Coordinate p1 = path.get(i-1);
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86 Coordinate p2 = path.get(i);
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87 double segmentLength = metrics.distance(p1, p2);
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88
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89 double relativeLength = segmentLength / worldLength;
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90
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91 double rangeLength = diagramLength * relativeLength;
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92
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93 double rangeEnd = rangeStart + rangeLength;
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94
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95 Range range = new Range(
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96 rangeStart, rangeEnd,
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97 metrics.getInterpolator(p1, p2),
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98 p1, p2);
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99
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100 if (last == null) {
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101 last = head = range;
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102 }
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103 else {
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104 last.next = range;
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105 last = range;
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106 }
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107 rangeStart = rangeEnd;
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108 }
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109 }
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110
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111 protected Range locateRange(double diagramX) {
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112
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113 if (last != null && last.inside(diagramX)) {
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114 return last;
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115 }
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116
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117 Range current = head;
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118 while (current != null) {
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119 if (current.inside(diagramX)) {
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120 return last = current;
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121 }
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122 current = current.next;
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123 }
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124
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125 return null;
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126 }
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127
361
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128 public boolean locate(double diagramX, Coordinate v) {
360
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129 Range range = locateRange(diagramX);
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130 if (range == null) {
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131 return false;
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132 }
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133 range.eval(diagramX, v);
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134 return true;
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135 }
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136
361
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137 public static double length(
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138 List<? extends Coordinate> path,
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139 Metrics metrics
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140 ) {
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141 double sum = 0d;
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142 for (int i = path.size()-1; i >= 1; --i) {
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143 Coordinate p1 = path.get(i);
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144 Coordinate p2 = path.get(i-1);
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145 sum += metrics.distance(p1, p2);
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146 }
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147 return sum;
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148 }
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149
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150 public int numRanges() {
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151 int count = 0;
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152 Range current = head;
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153 while (current != null) {
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154 ++count;
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155 current = current.next;
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156 }
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157 return count;
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158 }
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159
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160 public Iterator ranges() {
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161 return new Iterator() {
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162
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163 Range current = head;
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164
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165 public boolean hasNext() {
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166 return current != null;
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167 }
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168
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169 public Object next() {
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170 if (!hasNext()) {
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171 throw new NoSuchElementException();
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172 }
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173 Range x = current;
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174 current = current.next;
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175 return x;
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176 }
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177
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178 public void remove() {
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179 throw new UnsupportedOperationException();
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180 }
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181 };
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182 }
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183 }
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184 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8:
http://dive4elements.wald.intevation.org