Mercurial > dive4elements > river

annotate flys-artifacts/src/main/java/de/intevation/flys/artifacts/geom/Lines.java @ 2650:a6fa128e4654

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Add method to calculate length of water lines. flys-artifacts/trunk@4311 c6561f87-3c4e-4783-a992-168aeb5c3f6f
author Sascha L. Teichmann <sascha.teichmann@intevation.de>
date Thu, 26 Apr 2012 13:38:56 +0000
parents a7def20539fb
children 9d2a06c3a134
rev   line source
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1 package de.intevation.flys.geom;
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2
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3 import java.util.ArrayList;
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4 import java.util.List;
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5 import java.util.Iterator;
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6
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7 import java.awt.geom.Point2D;
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8 import java.awt.geom.Line2D;
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9
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10 import de.intevation.flys.artifacts.math.Linear;
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11
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12 import org.apache.log4j.Logger;
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13
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14 import gnu.trove.TDoubleArrayList;
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15
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16 public class Lines
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17 {
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18 private static Logger log = Logger.getLogger(Lines.class);
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19
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20 public static final double EPSILON = 1e-4;
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21
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22 public static enum Mode { UNDEF, WET, DRY };
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23
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24 protected Lines() {
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25 }
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26
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27 public static double length(List<Line2D> lines) {
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28 double sum = 0d;
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29 for (Line2D line: lines) {
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30 double xDiff = line.getX1() - line.getX2();
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31 double yDiff = line.getY1() - line.getY2();
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32 sum += Math.sqrt(xDiff*xDiff + yDiff*yDiff);
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33 }
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34 return sum;
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35 }
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36
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37 public static List<Line2D> fillWater(List<Point2D> points, double waterLevel) {
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38
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39 boolean debug = log.isDebugEnabled();
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40
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41 if (debug) {
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42 log.debug("fillWater");
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43 log.debug("----------------------------");
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44 }
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45
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46 List<Line2D> result = new ArrayList();
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47
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48 int N = points.size();
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49
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50 if (N == 0) {
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51 return result;
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52 }
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53
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54 if (N == 1) {
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55 Point2D p = points.get(0);
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56 // Only generate point if over water
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57 if (waterLevel > p.getY()) {
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58 result.add(new Line2D.Double(
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59 p.getX(), waterLevel,
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60 p.getX(), waterLevel));
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61 }
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62 return result;
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63 }
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64
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65 double minX = Double.MAX_VALUE;
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66 double minY = Double.MAX_VALUE;
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67 double maxX = -Double.MAX_VALUE;
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68 double maxY = -Double.MAX_VALUE;
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69
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70 // To ensure for sequences of equals x's that
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71 // the original index order is preserved.
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72 for (Point2D p: points) {
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73 double x = p.getX(), y = p.getY();
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74 if (x < minX) minX = x;
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75 if (x > maxX) maxX = x;
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76 if (y < minY) minY = y;
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77 if (y > maxY) maxY = y;
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78 }
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79
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80 if (minY > waterLevel) { // profile completely over water level
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81 log.debug("complete over water");
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82 return result;
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83 }
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84
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85 if (waterLevel > maxY) { // water floods profile
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86 log.debug("complete under water");
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87 result.add(new Line2D.Double(minX, waterLevel, maxX, waterLevel));
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88 return result;
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89 }
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90
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91 Mode mode = Mode.UNDEF;
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92
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93 double startX = minX;
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94
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95 for (int i = 1; i < N; ++i) {
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96 Point2D p1 = points.get(i-1);
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97 Point2D p2 = points.get(i);
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98
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99 if (p1.getY() < waterLevel && p2.getY() < waterLevel) {
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100 // completely under water
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101 if (debug) {
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102 log.debug("under water: " + p1 + " " + p2);
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103 }
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104 if (mode != Mode.WET) {
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105 startX = p1.getX();
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106 mode = Mode.WET;
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107 }
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108 continue;
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109 }
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110
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111 if (p1.getY() > waterLevel && p2.getY() > waterLevel) {
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112 if (debug) {
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113 log.debug("over water: " + p1 + " " + p2);
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114 }
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115 // completely over water
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116 if (mode == Mode.WET) {
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117 log.debug("over/wet");
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118 result.add(new Line2D.Double(
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119 startX, waterLevel,
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120 p1.getX(), waterLevel));
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121 }
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122 mode = Mode.DRY;
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123 continue;
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124 }
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125
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126 if (Math.abs(p1.getX() - p2.getX()) < EPSILON) {
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127 // vertical line
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128 switch (mode) {
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129 case WET:
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130 log.debug("vertical/wet");
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diff changeset
131 mode = Mode.DRY;
34136924661b Generate water level lines for given cross section.
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parents:
diff changeset
132 result.add(new Line2D.Double(
34136924661b Generate water level lines for given cross section.
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parents:
diff changeset
133 startX, waterLevel,
34136924661b Generate water level lines for given cross section.
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parents:
diff changeset
134 p1.getX(), waterLevel));
34136924661b Generate water level lines for given cross section.
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parents:
diff changeset
135 break;
34136924661b Generate water level lines for given cross section.
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parents:
diff changeset
136 case DRY:
938
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137 log.debug("vertical/dry");
933
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138 mode = Mode.WET;
34136924661b Generate water level lines for given cross section.
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parents:
diff changeset
139 startX = p2.getX();
34136924661b Generate water level lines for given cross section.
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parents:
diff changeset
140 break;
34136924661b Generate water level lines for given cross section.
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parents:
diff changeset
141 default: // UNDEF
938
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diff changeset
142 log.debug("vertical/undef");
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parents:
diff changeset
143 if (p2.getY() < waterLevel) {
34136924661b Generate water level lines for given cross section.
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diff changeset
144 mode = Mode.WET;
34136924661b Generate water level lines for given cross section.
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parents:
diff changeset
145 startX = p2.getX();
34136924661b Generate water level lines for given cross section.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
146 }
34136924661b Generate water level lines for given cross section.
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parents:
diff changeset
147 else {
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parents:
diff changeset
148 mode = Mode.DRY;
34136924661b Generate water level lines for given cross section.
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parents:
diff changeset
149 }
34136924661b Generate water level lines for given cross section.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
150 }
34136924661b Generate water level lines for given cross section.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
151 continue;
34136924661b Generate water level lines for given cross section.
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parents:
diff changeset
152 }
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153
938
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154 // check if waterlevel directly hits the vertices;
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155
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diff changeset
156 boolean p1W = Math.abs(waterLevel - p1.getY()) < EPSILON;
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diff changeset
157 boolean p2W = Math.abs(waterLevel - p2.getY()) < EPSILON;
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158
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diff changeset
159 if (p1W || p2W) {
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diff changeset
160 if (debug) {
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diff changeset
161 log.debug("water hits vertex: " + p1 + " " + p2 + " " + mode);
bd3683453928 Debugged the water fill algorithm.
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parents: 934
diff changeset
162 }
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diff changeset
163 if (p1W && p2W) { // parallel to water -> dry
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diff changeset
164 log.debug("water hits both vertices");
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diff changeset
165 if (mode == Mode.WET) {
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parents: 934
diff changeset
166 result.add(new Line2D.Double(
bd3683453928 Debugged the water fill algorithm.
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parents: 934
diff changeset
167 startX, waterLevel,
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parents: 934
diff changeset
168 p1.getX(), waterLevel));
bd3683453928 Debugged the water fill algorithm.
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parents: 934
diff changeset
169 }
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diff changeset
170 mode = Mode.DRY;
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parents: 934
diff changeset
171 }
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parents: 934
diff changeset
172 else if (p1W) { // p1 == waterlevel
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diff changeset
173 log.debug("water hits first vertex");
bd3683453928 Debugged the water fill algorithm.
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parents: 934
diff changeset
174 if (p2.getY() > waterLevel) { // --> dry
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parents: 934
diff changeset
175 if (mode == Mode.WET) {
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parents: 934
diff changeset
176 result.add(new Line2D.Double(
bd3683453928 Debugged the water fill algorithm.
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diff changeset
177 startX, waterLevel,
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parents: 934
diff changeset
178 p1.getX(), waterLevel));
bd3683453928 Debugged the water fill algorithm.
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parents: 934
diff changeset
179 }
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diff changeset
180 mode = Mode.DRY;
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diff changeset
181 }
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diff changeset
182 else { // --> wet
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Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 934
diff changeset
183 if (mode != Mode.WET) {
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Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 934
diff changeset
184 startX = p1.getX();
bd3683453928 Debugged the water fill algorithm.
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diff changeset
185 mode = Mode.WET;
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diff changeset
186 }
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Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 934
diff changeset
187 }
bd3683453928 Debugged the water fill algorithm.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 934
diff changeset
188 }
bd3683453928 Debugged the water fill algorithm.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 934
diff changeset
189 else { // p2 == waterlevel
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diff changeset
190 log.debug("water hits second vertex");
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parents: 934
diff changeset
191 if (p1.getY() > waterLevel) { // --> wet
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parents: 934
diff changeset
192 if (mode != Mode.WET) {
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Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 934
diff changeset
193 startX = p2.getX();
bd3683453928 Debugged the water fill algorithm.
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parents: 934
diff changeset
194 mode = Mode.WET;
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Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 934
diff changeset
195 }
bd3683453928 Debugged the water fill algorithm.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 934
diff changeset
196 }
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diff changeset
197 else { // --> dry
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parents: 934
diff changeset
198 if (mode == Mode.WET) {
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diff changeset
199 result.add(new Line2D.Double(
bd3683453928 Debugged the water fill algorithm.
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parents: 934
diff changeset
200 startX, waterLevel,
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parents: 934
diff changeset
201 p2.getX(), waterLevel));
bd3683453928 Debugged the water fill algorithm.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 934
diff changeset
202 }
bd3683453928 Debugged the water fill algorithm.
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parents: 934
diff changeset
203 mode = Mode.DRY;
bd3683453928 Debugged the water fill algorithm.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 934
diff changeset
204 }
bd3683453928 Debugged the water fill algorithm.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 934
diff changeset
205 }
bd3683453928 Debugged the water fill algorithm.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 934
diff changeset
206 if (debug) {
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Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 934
diff changeset
207 log.debug("mode is now: " + mode);
bd3683453928 Debugged the water fill algorithm.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 934
diff changeset
208 }
bd3683453928 Debugged the water fill algorithm.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 934
diff changeset
209 continue;
bd3683453928 Debugged the water fill algorithm.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 934
diff changeset
210 }
bd3683453928 Debugged the water fill algorithm.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 934
diff changeset
211
933
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parents:
diff changeset
212 // intersection case
34136924661b Generate water level lines for given cross section.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
213 double x = Linear.linear(
34136924661b Generate water level lines for given cross section.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
214 waterLevel,
938
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diff changeset
215 p1.getY(), p2.getY(),
bd3683453928 Debugged the water fill algorithm.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 934
diff changeset
216 p1.getX(), p2.getX());
bd3683453928 Debugged the water fill algorithm.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 934
diff changeset
217
bd3683453928 Debugged the water fill algorithm.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 934
diff changeset
218 if (debug) {
bd3683453928 Debugged the water fill algorithm.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 934
diff changeset
219 log.debug("intersection p1:" + p1);
bd3683453928 Debugged the water fill algorithm.
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parents: 934
diff changeset
220 log.debug("intersection p2:" + p2);
bd3683453928 Debugged the water fill algorithm.
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parents: 934
diff changeset
221 log.debug("intersection at x: " + x);
bd3683453928 Debugged the water fill algorithm.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 934
diff changeset
222 }
933
34136924661b Generate water level lines for given cross section.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
223
34136924661b Generate water level lines for given cross section.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
224 switch (mode) {
34136924661b Generate water level lines for given cross section.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
225 case WET:
938
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parents: 934
diff changeset
226 log.debug("intersect/wet");
933
34136924661b Generate water level lines for given cross section.
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parents:
diff changeset
227 mode = Mode.DRY;
34136924661b Generate water level lines for given cross section.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
228 result.add(new Line2D.Double(
34136924661b Generate water level lines for given cross section.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
229 startX, waterLevel,
34136924661b Generate water level lines for given cross section.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
230 x, waterLevel));
34136924661b Generate water level lines for given cross section.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
231 break;
34136924661b Generate water level lines for given cross section.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
232
34136924661b Generate water level lines for given cross section.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
233 case DRY:
938
bd3683453928 Debugged the water fill algorithm.
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parents: 934
diff changeset
234 log.debug("intersect/dry");
933
34136924661b Generate water level lines for given cross section.
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parents:
diff changeset
235 mode = Mode.WET;
34136924661b Generate water level lines for given cross section.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
236 startX = x;
34136924661b Generate water level lines for given cross section.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
237 break;
34136924661b Generate water level lines for given cross section.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
238
34136924661b Generate water level lines for given cross section.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
239 default: // UNDEF
938
bd3683453928 Debugged the water fill algorithm.
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diff changeset
240 log.debug("intersect/undef");
933
34136924661b Generate water level lines for given cross section.
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parents:
diff changeset
241 if (p2.getY() > waterLevel) {
938
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parents: 934
diff changeset
242 log.debug("intersect/undef/over");
933
34136924661b Generate water level lines for given cross section.
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parents:
diff changeset
243 mode = Mode.DRY;
34136924661b Generate water level lines for given cross section.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
244 result.add(new Line2D.Double(
34136924661b Generate water level lines for given cross section.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
245 p1.getX(), waterLevel,
34136924661b Generate water level lines for given cross section.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
246 x, waterLevel));
34136924661b Generate water level lines for given cross section.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
247 }
34136924661b Generate water level lines for given cross section.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
248 else {
34136924661b Generate water level lines for given cross section.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
249 mode = Mode.WET;
34136924661b Generate water level lines for given cross section.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
250 startX = x;
34136924661b Generate water level lines for given cross section.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
251 }
34136924661b Generate water level lines for given cross section.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
252 } // switch mode
934
d0f3fea20f01 Fixed corner case.
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parents: 933
diff changeset
253 } // for all points p[i] and p[i-1]
933
34136924661b Generate water level lines for given cross section.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
254
34136924661b Generate water level lines for given cross section.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
255 if (mode == Mode.WET) {
34136924661b Generate water level lines for given cross section.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
256 result.add(new Line2D.Double(
34136924661b Generate water level lines for given cross section.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
257 startX, waterLevel,
34136924661b Generate water level lines for given cross section.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
258 maxX, waterLevel));
34136924661b Generate water level lines for given cross section.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
259 }
34136924661b Generate water level lines for given cross section.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
260
34136924661b Generate water level lines for given cross section.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
261 return result;
34136924661b Generate water level lines for given cross section.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
262 }
1651
a7def20539fb flys/issue317: Removed dependency from cross section demo app.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 938
diff changeset
263
a7def20539fb flys/issue317: Removed dependency from cross section demo app.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 938
diff changeset
264 public static double [][] createWaterLines(
a7def20539fb flys/issue317: Removed dependency from cross section demo app.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 938
diff changeset
265 List<Point2D> points,
a7def20539fb flys/issue317: Removed dependency from cross section demo app.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 938
diff changeset
266 double waterlevel
a7def20539fb flys/issue317: Removed dependency from cross section demo app.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 938
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267 ) {
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268 List<Line2D> lines = fillWater(points, waterlevel);
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269
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270 TDoubleArrayList lxs = new TDoubleArrayList();
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271 TDoubleArrayList lys = new TDoubleArrayList();
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272
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273 for (Iterator<Line2D> iter = lines.iterator(); iter.hasNext();) {
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274 Line2D l = iter.next();
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275 Point2D p1 = l.getP1();
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276 Point2D p2 = l.getP2();
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277 lxs.add(p1.getX());
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278 lys.add(p1.getY());
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279 lxs.add(p2.getX());
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280 lys.add(p2.getY());
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281 if (iter.hasNext()) {
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282 lxs.add(Double.NaN);
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283 lys.add(Double.NaN);
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284 }
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285 }
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286
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287 return new double [][] { lxs.toNativeArray(), lys.toNativeArray() };
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288 }
933
34136924661b Generate water level lines for given cross section.
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289 }
34136924661b Generate water level lines for given cross section.
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290 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 :
http://dive4elements.wald.intevation.org