Mercurial > dive4elements > gnv-client
annotate gnv-artifacts/src/main/java/de/intevation/gnv/math/Point2d.java @ 1113:e7efbded1367
Summarized changes for RELEASE 1.1
gnv-artifacts/trunk@1251 c6561f87-3c4e-4783-a992-168aeb5c3f6f
author | Ingo Weinzierl <ingo.weinzierl@intevation.de> |
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date | Wed, 30 Jun 2010 12:26:04 +0000 |
parents | 6cff63d0c434 |
children | f953c9a559d8 |
rev | line source |
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361
aec85d00d82c
Added code to do 2D interpolations along a digitied track on the map.
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parents:
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1 package de.intevation.gnv.math; |
aec85d00d82c
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2 |
593
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Added experimental support for extrapolation in "Horizontalschnitte"
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3 import com.vividsolutions.jts.geom.Coordinate; |
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4 import com.vividsolutions.jts.geom.Envelope; |
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5 |
361
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6 import java.util.Comparator; |
aec85d00d82c
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7 |
593
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Added experimental support for extrapolation in "Horizontalschnitte"
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8 import org.apache.log4j.Logger; |
361
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9 |
aec85d00d82c
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parents:
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10 /** |
798
6cff63d0c434
Fixed vim modeline. Added some Javadoc.
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parents:
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11 * Point which besides the x, y, z coodinates has an index i, j pair |
6cff63d0c434
Fixed vim modeline. Added some Javadoc.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
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12 * to model neighborhood. |
6cff63d0c434
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parents:
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13 * @author <a href="mailto:sascha.teichmann@intevation.de">Sascha L. Teichmann</a> |
361
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14 */ |
aec85d00d82c
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15 public class Point2d |
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16 extends Coordinate |
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17 { |
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18 private static Logger log = Logger.getLogger(Point2d.class); |
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19 |
798
6cff63d0c434
Fixed vim modeline. Added some Javadoc.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
780
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20 /** |
6cff63d0c434
Fixed vim modeline. Added some Javadoc.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
780
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21 * Numerical tolerance epsilon: {@value} |
6cff63d0c434
Fixed vim modeline. Added some Javadoc.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
780
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22 */ |
365
f66088a43ecc
Added horizontal crossprofile charts to chart pallet. Fixed some bugs before interpolation.
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23 public static final double EPSILON = 1e-3d; |
361
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24 |
798
6cff63d0c434
Fixed vim modeline. Added some Javadoc.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
780
diff
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25 /** |
6cff63d0c434
Fixed vim modeline. Added some Javadoc.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
780
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26 * Compares two Point2ds by their x coordinates |
6cff63d0c434
Fixed vim modeline. Added some Javadoc.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
780
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27 */ |
361
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28 public static final Comparator X_COMPARATOR = new Comparator() { |
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29 public int compare(Object a, Object b) { |
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30 double xa = ((Coordinate)a).x; |
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31 double xb = ((Coordinate)b).x; |
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32 if (xa < xb) return -1; |
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33 if (xa > xb) return +1; |
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34 return 0; |
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35 } |
aec85d00d82c
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36 }; |
aec85d00d82c
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parents:
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37 |
798
6cff63d0c434
Fixed vim modeline. Added some Javadoc.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
780
diff
changeset
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38 /** |
6cff63d0c434
Fixed vim modeline. Added some Javadoc.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
780
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39 * Compares two Point2ds by their y coordinates. |
6cff63d0c434
Fixed vim modeline. Added some Javadoc.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
780
diff
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40 */ |
361
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41 public static final Comparator Y_COMPARATOR = new Comparator() { |
aec85d00d82c
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42 public int compare(Object a, Object b) { |
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43 double ya = ((Coordinate)a).y; |
aec85d00d82c
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44 double yb = ((Coordinate)b).y; |
aec85d00d82c
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45 if (ya < yb) return -1; |
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46 if (ya > yb) return +1; |
aec85d00d82c
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47 return 0; |
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48 } |
aec85d00d82c
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49 }; |
aec85d00d82c
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parents:
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50 |
798
6cff63d0c434
Fixed vim modeline. Added some Javadoc.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
780
diff
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51 /** |
6cff63d0c434
Fixed vim modeline. Added some Javadoc.
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parents:
780
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52 * The i index of this Point2d. |
6cff63d0c434
Fixed vim modeline. Added some Javadoc.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
780
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53 */ |
361
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54 public int i; |
798
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parents:
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55 /** |
6cff63d0c434
Fixed vim modeline. Added some Javadoc.
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parents:
780
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56 * The j index of this Point2d. |
6cff63d0c434
Fixed vim modeline. Added some Javadoc.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
780
diff
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57 */ |
361
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58 public int j; |
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59 |
798
6cff63d0c434
Fixed vim modeline. Added some Javadoc.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
780
diff
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60 /** |
6cff63d0c434
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parents:
780
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61 * Default constructor. |
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parents:
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62 */ |
361
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63 public Point2d() { |
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64 } |
aec85d00d82c
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parents:
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65 |
798
6cff63d0c434
Fixed vim modeline. Added some Javadoc.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
780
diff
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66 /** |
6cff63d0c434
Fixed vim modeline. Added some Javadoc.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
780
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67 * Constructor setting x and y coordinate. |
6cff63d0c434
Fixed vim modeline. Added some Javadoc.
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parents:
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68 * @param x The x coordinate. |
6cff63d0c434
Fixed vim modeline. Added some Javadoc.
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parents:
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69 * @param y The y coordinate. |
6cff63d0c434
Fixed vim modeline. Added some Javadoc.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
780
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70 */ |
593
b248531fa20b
Added experimental support for extrapolation in "Horizontalschnitte"
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
431
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71 public Point2d(double x, double y) { |
b248531fa20b
Added experimental support for extrapolation in "Horizontalschnitte"
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parents:
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72 super(x, y); |
b248531fa20b
Added experimental support for extrapolation in "Horizontalschnitte"
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parents:
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73 } |
b248531fa20b
Added experimental support for extrapolation in "Horizontalschnitte"
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
431
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74 |
798
6cff63d0c434
Fixed vim modeline. Added some Javadoc.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
780
diff
changeset
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75 /** |
6cff63d0c434
Fixed vim modeline. Added some Javadoc.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
780
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76 * Constructor setting x, y and i, j. |
6cff63d0c434
Fixed vim modeline. Added some Javadoc.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
780
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77 * @param x The x coordinate. |
6cff63d0c434
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Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
780
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78 * @param y The y coordinate. |
6cff63d0c434
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parents:
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79 * @param i The i index. |
6cff63d0c434
Fixed vim modeline. Added some Javadoc.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
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80 * @param j The j index. |
6cff63d0c434
Fixed vim modeline. Added some Javadoc.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
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81 */ |
431
422275fc9927
Refactored the XYColumn and Point2d code a bit to be more reusable in 3D.
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82 public Point2d(double x, double y, int i, int j) { |
422275fc9927
Refactored the XYColumn and Point2d code a bit to be more reusable in 3D.
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83 super(x, y); |
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84 this.i = i; |
422275fc9927
Refactored the XYColumn and Point2d code a bit to be more reusable in 3D.
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85 this.j = j; |
422275fc9927
Refactored the XYColumn and Point2d code a bit to be more reusable in 3D.
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parents:
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86 } |
422275fc9927
Refactored the XYColumn and Point2d code a bit to be more reusable in 3D.
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parents:
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87 |
798
6cff63d0c434
Fixed vim modeline. Added some Javadoc.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
780
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88 /** |
6cff63d0c434
Fixed vim modeline. Added some Javadoc.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
780
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89 * Constructor setting x, y, z and i, j. |
6cff63d0c434
Fixed vim modeline. Added some Javadoc.
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parents:
780
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90 * @param x The x coordinate. |
6cff63d0c434
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parents:
780
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91 * @param y The y coordinate. |
6cff63d0c434
Fixed vim modeline. Added some Javadoc.
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parents:
780
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92 * @param z The z coordinate. |
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Fixed vim modeline. Added some Javadoc.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
780
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93 * @param i The i index. |
6cff63d0c434
Fixed vim modeline. Added some Javadoc.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
780
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94 * @param j The j index. |
6cff63d0c434
Fixed vim modeline. Added some Javadoc.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
780
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95 */ |
361
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96 public Point2d(double x, double y, double z, int i, int j) { |
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97 super(x, y, z); |
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98 this.i = i; |
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99 this.j = j; |
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100 } |
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101 |
798
6cff63d0c434
Fixed vim modeline. Added some Javadoc.
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parents:
780
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102 /** |
6cff63d0c434
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parents:
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103 * Calculates the L1 distance to another Point2d. |
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104 * @param other The other Point2d. |
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105 * @return The L1 distance. |
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106 */ |
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107 public double L1(Point2d other) { |
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108 return L1Comparator.L1(this, other); |
361
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109 } |
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110 |
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111 /** |
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112 * Creates an envelope around this Point2d with |
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113 * the numerical tolerance of {@link #EPSILON}. |
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114 * @return The envelope. |
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115 */ |
361
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116 public Envelope envelope() { |
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117 return envelope(EPSILON); |
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118 } |
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119 |
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120 /** |
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121 *Creates an envelope around this Point2d with |
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122 * a given tolerance. |
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123 * @param epsilon The tolerance in all directions. |
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124 * @return The envelope. |
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125 */ |
361
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126 public Envelope envelope(double epsilon) { |
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127 return new Envelope( |
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128 x-epsilon, x+epsilon, |
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129 y-epsilon, y+epsilon); |
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130 } |
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131 |
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132 /** |
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133 * Given this and another Point2d it looks if there is |
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134 * a gap between the in points in i index direction. |
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135 * @param other The other Point2d. |
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136 * @return true if there is is a gap, else false. |
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137 */ |
361
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138 public boolean hasIGap(Point2d other) { |
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139 return Math.abs(i - other.i) > 1; |
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140 } |
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141 |
798
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142 /** |
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143 * Given this and another Point2d it looks if there is |
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144 * a gap between the in points in j index direction. |
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145 * @param other The other Point2d. |
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146 * @return true if there is is a gap, else false. |
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147 */ |
361
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148 public boolean hasJGap(Point2d other) { |
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149 return Math.abs(j - other.j) > 1; |
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150 } |
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151 |
798
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152 /** |
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153 * Given this and another Point2d a new Point2d is |
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154 * created via {@link #newPoint() }. The x, y coordinate |
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155 * of the new point is on the line of this and the other |
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156 * given point at a given scaling point. |
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157 * @param t The scaling factor. |
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158 * @param other The other point. |
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159 * @return The new Point2d. |
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160 */ |
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161 public Point2d extrapolate(double t, Point2d other) { |
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162 if (other == null) { |
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163 return null; |
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164 } |
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165 Point2d p = newPoint(); |
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166 p.x = t*(other.x - x) + x; |
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167 p.y = t*(other.y - y) + y; |
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168 return p; |
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169 } |
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170 |
798
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171 /** |
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172 * Creates a new Point2d or an instance of a subclass. |
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173 * Override this in subclasses. |
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174 * @return The new Point2d. |
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175 */ |
593
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176 public Point2d newPoint() { |
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177 return new Point2d(0d, 0d); |
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178 } |
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179 |
798
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180 /** |
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181 * Creates a new Point2d or an instance of a subclass |
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182 * at a given coordinate. |
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183 * Override this in subclasses. |
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184 * @param x The x coordinate. |
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185 * @param y The y coordinate. |
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186 * @return The new point. |
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187 */ |
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188 public Point2d newPoint(double x, double y) { |
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189 return new Point2d(x, y); |
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190 } |
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191 |
798
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192 /** |
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193 * Sets the z value to the inverse distance weighting (IDW) value |
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194 * of the z values of a set of given points. |
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195 * @param ps The points from wich the z values are taken |
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196 * to calculate the IDW. |
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197 */ |
593
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198 public void inverseDistanceWeighting(Point2d [] ps) { |
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199 |
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200 double sum = 0d; |
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201 |
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202 double [] d = new double[ps.length]; |
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203 |
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204 for (int i = 0; i < ps.length; ++i) { |
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205 Point2d p = ps[i]; |
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206 if (p != null) { |
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207 double di = distance(p); |
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208 if (di < 1e-5d) { z = p.z; return; } |
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209 di = 1d/di; |
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210 d[i] = di; |
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211 sum += di; |
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212 } |
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213 } |
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214 |
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215 if (sum == 0d) { |
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216 return; |
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217 } |
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218 |
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219 double v = 0d; |
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220 |
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221 for (int i = 0; i < ps.length; ++i) { |
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222 Point2d p = ps[i]; |
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223 if (p != null) { |
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224 v += p.z*d[i]; |
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225 } |
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226 } |
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227 z = v/sum; |
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228 } |
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229 |
798
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230 /** |
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231 * Creates a new point via {@link #newPoint() } with the |
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232 * x,y coordinates of the center of a given set of |
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233 * coordinates. |
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234 * @param ps The points from which the x,y coordinates are |
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235 * taken to calculate the center. |
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236 * @return The new center point. |
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237 */ |
593
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238 public static Point2d average(Point2d [] ps) { |
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239 |
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240 Point2d p = null; |
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241 int count = 0; |
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242 |
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243 for (int i = 0; i < ps.length; ++i) { |
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244 Point2d t = ps[i]; |
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245 if (t != null) { |
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246 ++count; |
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247 if (p == null) { |
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248 p = t.newPoint(t.x, t.y); |
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249 } |
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250 else { |
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251 p.x += t.x; |
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252 p.y += t.y; |
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253 } |
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254 } |
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255 } |
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256 |
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257 if (p != null) { |
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258 double s = 1d/count; |
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259 p.x *= s; |
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260 p.y *= s; |
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261 } |
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262 |
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263 return p; |
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264 } |
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265 |
798
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266 /** |
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267 * Checks if this Point2d is near to at least one point |
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268 * out of a given set of points. Near is defined by an |
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269 * euclidian distance small than {@link #EPSILON}. |
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270 * @param ps The set of points to be tested. |
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271 * @return true if this Point2d is near to one of the given |
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272 * points, else false. |
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273 */ |
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274 public boolean near(Point2d [] ps) { |
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275 |
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276 for (int i = 0; i < ps.length; ++i) { |
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277 Point2d p = ps[i]; |
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278 if (p != null && distance(p) > EPSILON) { |
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279 return false; |
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280 } |
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281 } |
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282 |
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283 return true; |
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284 } |
361
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285 } |
798
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286 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 : |