Mercurial > dive4elements > river

annotate flys-artifacts/src/main/java/de/intevation/flys/artifacts/geom/Polygon2D.java @ 1797:5eec623db50a

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Polygon2D: moved 2D vector operation to separate class. flys-artifacts/trunk@3120 c6561f87-3c4e-4783-a992-168aeb5c3f6f
author Sascha L. Teichmann <sascha.teichmann@intevation.de>
date Mon, 31 Oct 2011 10:03:32 +0000
parents fe7f9264a2ed
children 552888e9c64a
rev   line source
1794
2ad7ba85a2b3 Work in progress: Added polygon to help creating 'Raum/Flaeche' renderers.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
1 package de.intevation.flys.geom;
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2
2ad7ba85a2b3 Work in progress: Added polygon to help creating 'Raum/Flaeche' renderers.
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3 import java.io.Serializable;
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4
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5 import java.awt.Shape;
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6
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7 import java.awt.geom.Path2D;
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8 import java.awt.geom.Point2D;
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9
2ad7ba85a2b3 Work in progress: Added polygon to help creating 'Raum/Flaeche' renderers.
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10 import java.util.ArrayList;
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11 import java.util.List;
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12 import java.util.Arrays;
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13 import java.util.Comparator;
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14 import java.util.Collections;
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15
2ad7ba85a2b3 Work in progress: Added polygon to help creating 'Raum/Flaeche' renderers.
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16 public class Polygon2D
2ad7ba85a2b3 Work in progress: Added polygon to help creating 'Raum/Flaeche' renderers.
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17 implements Serializable
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18 {
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19 private static final double X(Point2D p) {
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20 return p.getX();
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21 }
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22
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23 private static final double Y(Point2D p) {
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24 return p.getY();
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25 }
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26
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27 public static final Comparator<Point2D> POINT_X_CMP =
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28 new Comparator<Point2D>() {
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29 public int compare(Point2D a, Point2D b) {
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30 double d = X(a) - X(b);
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31 if (d < 0d) return -1;
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32 return d > 0d ? + 1 : 0;
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33 }
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34 };
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35
2ad7ba85a2b3 Work in progress: Added polygon to help creating 'Raum/Flaeche' renderers.
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36 public static final Comparator<Point2D []> FIRST_POINT_X =
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37 new Comparator<Point2D []>() {
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38 public int compare(Point2D [] a, Point2D [] b) {
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39 if (a.length == 0) return -1; // should not happen.
2ad7ba85a2b3 Work in progress: Added polygon to help creating 'Raum/Flaeche' renderers.
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40 if (b.length == 0) return +1; // should not happen.
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41 double d = X(a[0]) - Y(b[0]);
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2ad7ba85a2b3 Work in progress: Added polygon to help creating 'Raum/Flaeche' renderers.
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42 if (d < 0d) return -1;
2ad7ba85a2b3 Work in progress: Added polygon to help creating 'Raum/Flaeche' renderers.
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43 return d > 0d ? + 1 : 0;
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44 }
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45 };
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46
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47 protected List<Point2D> points;
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48
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49 public Polygon2D() {
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50 points = new ArrayList<Point2D>();
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51 }
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52
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53 public void add(double x, double y) {
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54 points.add(new Point2D.Double(x, y));
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55 }
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56
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57 public boolean addCheck(Point2D p) {
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58 switch (points.size()) {
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59 case 0:
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60 points.add(p);
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61 return true;
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62 case 1:
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5eec623db50a Polygon2D: moved 2D vector operation to separate class.
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63 if (VectorUtils.epsilonEquals(points.get(0), p)) {
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64 return false;
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65 }
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66 points.add(p);
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67 return true;
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68 default:
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69 int L = points.size()-1;
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70 Point2D last = points.get(L);
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5eec623db50a Polygon2D: moved 2D vector operation to separate class.
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71 if (VectorUtils.epsilonEquals(last, p)) {
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72 return false;
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73 }
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74 Point2D before = points.get(L-1);
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75 if (VectorUtils.collinear(before, last, p)) {
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76 points.set(L, p);
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77 }
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78 else {
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79 points.add(p);
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80 }
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81 return true;
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82 }
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83 }
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84
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85 public void addReversed(List<Point2D> other) {
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86 for (int i = other.size()-1; i >= 0; --i) {
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87 addCheck(other.get(i));
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88 }
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89 }
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90
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91 public double area() {
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92 double area = 0d;
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93
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94 for (int i = 0, N = points.size(); i < N; ++i) {
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95 int j = (i + 1) % N;
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96 Point2D pi = points.get(i);
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97 Point2D pj = points.get(j);
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98 area += X(pi)*Y(pj);
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99 area -= X(pj)*Y(pi);
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100 }
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101
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102 return 0.5d*area;
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103 }
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104
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105 public Shape toShape() {
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106 Path2D.Double path = new Path2D.Double();
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107
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108 int N = points.size();
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109
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110 if (N > 0) {
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111 Point2D p = points.get(0);
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112 path.moveTo(X(p), Y(p));
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113 for (int i = 1; i < N; ++i) {
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114 p = points.get(i);
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diff changeset
115 path.lineTo(X(p), Y(p));
1794
2ad7ba85a2b3 Work in progress: Added polygon to help creating 'Raum/Flaeche' renderers.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
116 }
2ad7ba85a2b3 Work in progress: Added polygon to help creating 'Raum/Flaeche' renderers.
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parents:
diff changeset
117 path.closePath();
2ad7ba85a2b3 Work in progress: Added polygon to help creating 'Raum/Flaeche' renderers.
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parents:
diff changeset
118 }
2ad7ba85a2b3 Work in progress: Added polygon to help creating 'Raum/Flaeche' renderers.
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parents:
diff changeset
119
2ad7ba85a2b3 Work in progress: Added polygon to help creating 'Raum/Flaeche' renderers.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
120 return path;
2ad7ba85a2b3 Work in progress: Added polygon to help creating 'Raum/Flaeche' renderers.
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parents:
diff changeset
121 }
2ad7ba85a2b3 Work in progress: Added polygon to help creating 'Raum/Flaeche' renderers.
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parents:
diff changeset
122
2ad7ba85a2b3 Work in progress: Added polygon to help creating 'Raum/Flaeche' renderers.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
123 protected static List<Point2D []> splitByNaNs(
2ad7ba85a2b3 Work in progress: Added polygon to help creating 'Raum/Flaeche' renderers.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
124 double [] xs,
2ad7ba85a2b3 Work in progress: Added polygon to help creating 'Raum/Flaeche' renderers.
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parents:
diff changeset
125 double [] ys
2ad7ba85a2b3 Work in progress: Added polygon to help creating 'Raum/Flaeche' renderers.
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parents:
diff changeset
126 ) {
2ad7ba85a2b3 Work in progress: Added polygon to help creating 'Raum/Flaeche' renderers.
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parents:
diff changeset
127 List<Point2D []> parts = new ArrayList<Point2D []>();
2ad7ba85a2b3 Work in progress: Added polygon to help creating 'Raum/Flaeche' renderers.
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parents:
diff changeset
128
2ad7ba85a2b3 Work in progress: Added polygon to help creating 'Raum/Flaeche' renderers.
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parents:
diff changeset
129 List<Point2D> tmp = new ArrayList<Point2D>(xs.length);
2ad7ba85a2b3 Work in progress: Added polygon to help creating 'Raum/Flaeche' renderers.
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parents:
diff changeset
130
2ad7ba85a2b3 Work in progress: Added polygon to help creating 'Raum/Flaeche' renderers.
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parents:
diff changeset
131 for (int i = 0; i < xs.length; ++i) {
2ad7ba85a2b3 Work in progress: Added polygon to help creating 'Raum/Flaeche' renderers.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
132 double x = xs[i];
2ad7ba85a2b3 Work in progress: Added polygon to help creating 'Raum/Flaeche' renderers.
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parents:
diff changeset
133 double y = ys[i];
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parents:
diff changeset
134
2ad7ba85a2b3 Work in progress: Added polygon to help creating 'Raum/Flaeche' renderers.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
135 if (Double.isNaN(x) || Double.isNaN(y)) {
2ad7ba85a2b3 Work in progress: Added polygon to help creating 'Raum/Flaeche' renderers.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
136 if (!tmp.isEmpty()) {
2ad7ba85a2b3 Work in progress: Added polygon to help creating 'Raum/Flaeche' renderers.
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parents:
diff changeset
137 Point2D [] part = new Point2D[tmp.size()];
2ad7ba85a2b3 Work in progress: Added polygon to help creating 'Raum/Flaeche' renderers.
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parents:
diff changeset
138 parts.add(tmp.toArray(part));
2ad7ba85a2b3 Work in progress: Added polygon to help creating 'Raum/Flaeche' renderers.
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parents:
diff changeset
139 tmp.clear();
2ad7ba85a2b3 Work in progress: Added polygon to help creating 'Raum/Flaeche' renderers.
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diff changeset
140 }
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parents:
diff changeset
141 }
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parents:
diff changeset
142 else {
2ad7ba85a2b3 Work in progress: Added polygon to help creating 'Raum/Flaeche' renderers.
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parents:
diff changeset
143 tmp.add(new Point2D.Double(x, y));
2ad7ba85a2b3 Work in progress: Added polygon to help creating 'Raum/Flaeche' renderers.
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parents:
diff changeset
144 }
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Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
145 }
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parents:
diff changeset
146
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parents:
diff changeset
147 if (!tmp.isEmpty()) {
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diff changeset
148 Point2D [] part = new Point2D[tmp.size()];
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parents:
diff changeset
149 parts.add(tmp.toArray(part));
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parents:
diff changeset
150 }
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parents:
diff changeset
151
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parents:
diff changeset
152 return parts;
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153 }
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parents:
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154
1795
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parents: 1794
diff changeset
155 protected static boolean removeNoneIntersecting(
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156 List<Point2D []> As,
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parents: 1794
diff changeset
157 List<Point2D []> Bs
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parents: 1794
diff changeset
158 ) {
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parents: 1794
diff changeset
159 OUTER: for (int i = 0; i < As.size();) {
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parents: 1794
diff changeset
160 Point2D [] a = As.get(i);
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parents: 1794
diff changeset
161 int lo = 0, hi = Bs.size()-1;
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parents: 1794
diff changeset
162 while (lo <= hi) {
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Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 1794
diff changeset
163 int mid = (lo + hi) >> 1;
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parents: 1794
diff changeset
164 Point2D [] b = Bs.get(mid);
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parents: 1794
diff changeset
165 if (X(a[0]) > X(b[b.length-1])) lo = mid+1;
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parents: 1794
diff changeset
166 else if (X(a[a.length-1]) < X(b[0])) hi = mid-1;
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parents: 1794
diff changeset
167 else {
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parents: 1794
diff changeset
168 // found: keep
fe7f9264a2ed Interim checkin for polygon calculation.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 1794
diff changeset
169 ++i;
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Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 1794
diff changeset
170 continue OUTER;
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Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 1794
diff changeset
171 }
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parents: 1794
diff changeset
172 }
fe7f9264a2ed Interim checkin for polygon calculation.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 1794
diff changeset
173 // not found: remove
fe7f9264a2ed Interim checkin for polygon calculation.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 1794
diff changeset
174 As.remove(i);
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Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 1794
diff changeset
175 }
fe7f9264a2ed Interim checkin for polygon calculation.
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parents: 1794
diff changeset
176
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parents: 1794
diff changeset
177 return As.isEmpty();
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parents: 1794
diff changeset
178 }
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parents: 1794
diff changeset
179
fe7f9264a2ed Interim checkin for polygon calculation.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 1794
diff changeset
180 protected static void buildPolygons(
fe7f9264a2ed Interim checkin for polygon calculation.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 1794
diff changeset
181 Point2D [] as,
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Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 1794
diff changeset
182 Point2D [] bs,
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Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 1794
diff changeset
183 Point2D [][] rest,
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Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 1794
diff changeset
184 List<Polygon2D> positives,
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parents: 1794
diff changeset
185 List<Polygon2D> negatives
fe7f9264a2ed Interim checkin for polygon calculation.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 1794
diff changeset
186 ) {
fe7f9264a2ed Interim checkin for polygon calculation.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 1794
diff changeset
187 }
fe7f9264a2ed Interim checkin for polygon calculation.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 1794
diff changeset
188
1794
2ad7ba85a2b3 Work in progress: Added polygon to help creating 'Raum/Flaeche' renderers.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
189 public static void createPolygons(
2ad7ba85a2b3 Work in progress: Added polygon to help creating 'Raum/Flaeche' renderers.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
190 double [] xAs, double [] yAs,
2ad7ba85a2b3 Work in progress: Added polygon to help creating 'Raum/Flaeche' renderers.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
191 double [] xBs, double [] yBs,
2ad7ba85a2b3 Work in progress: Added polygon to help creating 'Raum/Flaeche' renderers.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
192 List<Polygon2D> positives,
2ad7ba85a2b3 Work in progress: Added polygon to help creating 'Raum/Flaeche' renderers.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
193 List<Polygon2D> negatives
2ad7ba85a2b3 Work in progress: Added polygon to help creating 'Raum/Flaeche' renderers.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
194 ) {
2ad7ba85a2b3 Work in progress: Added polygon to help creating 'Raum/Flaeche' renderers.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
195 if (xAs.length == 0 || xBs.length == 0) {
2ad7ba85a2b3 Work in progress: Added polygon to help creating 'Raum/Flaeche' renderers.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
196 return;
2ad7ba85a2b3 Work in progress: Added polygon to help creating 'Raum/Flaeche' renderers.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
197 }
2ad7ba85a2b3 Work in progress: Added polygon to help creating 'Raum/Flaeche' renderers.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
198
2ad7ba85a2b3 Work in progress: Added polygon to help creating 'Raum/Flaeche' renderers.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
199 List<Point2D []> splAs = splitByNaNs(xAs, yAs);
2ad7ba85a2b3 Work in progress: Added polygon to help creating 'Raum/Flaeche' renderers.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
200 List<Point2D []> splBs = splitByNaNs(xBs, yBs);
2ad7ba85a2b3 Work in progress: Added polygon to help creating 'Raum/Flaeche' renderers.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
201
2ad7ba85a2b3 Work in progress: Added polygon to help creating 'Raum/Flaeche' renderers.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
202 // They feeded us with NaNs only.
2ad7ba85a2b3 Work in progress: Added polygon to help creating 'Raum/Flaeche' renderers.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
203 if (splAs.isEmpty() || splBs.isEmpty()) {
2ad7ba85a2b3 Work in progress: Added polygon to help creating 'Raum/Flaeche' renderers.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
204 return;
2ad7ba85a2b3 Work in progress: Added polygon to help creating 'Raum/Flaeche' renderers.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
205 }
2ad7ba85a2b3 Work in progress: Added polygon to help creating 'Raum/Flaeche' renderers.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
206
2ad7ba85a2b3 Work in progress: Added polygon to help creating 'Raum/Flaeche' renderers.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
207 // Sort each part by x to ensure that the first
2ad7ba85a2b3 Work in progress: Added polygon to help creating 'Raum/Flaeche' renderers.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
208 // is the smallest.
2ad7ba85a2b3 Work in progress: Added polygon to help creating 'Raum/Flaeche' renderers.
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parents:
diff changeset
209 for (Point2D [] splA: splAs) {
2ad7ba85a2b3 Work in progress: Added polygon to help creating 'Raum/Flaeche' renderers.
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parents:
diff changeset
210 Arrays.sort(splA, POINT_X_CMP);
2ad7ba85a2b3 Work in progress: Added polygon to help creating 'Raum/Flaeche' renderers.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
211 }
2ad7ba85a2b3 Work in progress: Added polygon to help creating 'Raum/Flaeche' renderers.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
212
2ad7ba85a2b3 Work in progress: Added polygon to help creating 'Raum/Flaeche' renderers.
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parents:
diff changeset
213 for (Point2D [] splB: splBs) {
2ad7ba85a2b3 Work in progress: Added polygon to help creating 'Raum/Flaeche' renderers.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
214 Arrays.sort(splB, POINT_X_CMP);
2ad7ba85a2b3 Work in progress: Added polygon to help creating 'Raum/Flaeche' renderers.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
215 }
2ad7ba85a2b3 Work in progress: Added polygon to help creating 'Raum/Flaeche' renderers.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
216
2ad7ba85a2b3 Work in progress: Added polygon to help creating 'Raum/Flaeche' renderers.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
217 // Now sort all parts by there first elements.
2ad7ba85a2b3 Work in progress: Added polygon to help creating 'Raum/Flaeche' renderers.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
218 // Should be good enough to find overlapping regions.
2ad7ba85a2b3 Work in progress: Added polygon to help creating 'Raum/Flaeche' renderers.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
219 Collections.sort(splAs, FIRST_POINT_X);
2ad7ba85a2b3 Work in progress: Added polygon to help creating 'Raum/Flaeche' renderers.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
220 Collections.sort(splBs, FIRST_POINT_X);
2ad7ba85a2b3 Work in progress: Added polygon to help creating 'Raum/Flaeche' renderers.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
221
2ad7ba85a2b3 Work in progress: Added polygon to help creating 'Raum/Flaeche' renderers.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
222 // Check if the two series intersect at all.
2ad7ba85a2b3 Work in progress: Added polygon to help creating 'Raum/Flaeche' renderers.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
223 // If no then there will be no area between them.
2ad7ba85a2b3 Work in progress: Added polygon to help creating 'Raum/Flaeche' renderers.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
224
2ad7ba85a2b3 Work in progress: Added polygon to help creating 'Raum/Flaeche' renderers.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
225 Point2D [] p1 = splAs.get(0);
2ad7ba85a2b3 Work in progress: Added polygon to help creating 'Raum/Flaeche' renderers.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
226 Point2D [] p2 = splBs.get(splBs.size()-1);
2ad7ba85a2b3 Work in progress: Added polygon to help creating 'Raum/Flaeche' renderers.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
227
1795
fe7f9264a2ed Interim checkin for polygon calculation.
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parents: 1794
diff changeset
228 // Sort out the ranges that are not intersecting
fe7f9264a2ed Interim checkin for polygon calculation.
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parents: 1794
diff changeset
229 // the ranges in the other series.
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230 // We are going to merge them anyway
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231 // so this is not strictly required.
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232 // Keep it to recude cases.
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233 if (removeNoneIntersecting(splAs, splBs)
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234 || removeNoneIntersecting(splBs, splAs)
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235 ) {
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236 // They do not intersect at all.
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237 return;
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238 }
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239
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240 // TODO: Intersect/split the two series parts.
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241 }
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242 }
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243 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 :
http://dive4elements.wald.intevation.org