Mercurial > dive4elements > river
annotate flys-artifacts/src/main/java/de/intevation/flys/artifacts/geom/VectorUtils.java @ 1799:281b9430c720
Polygon2D: More code to build polygons from curve.
flys-artifacts/trunk@3123 c6561f87-3c4e-4783-a992-168aeb5c3f6f
author | Sascha L. Teichmann <sascha.teichmann@intevation.de> |
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date | Mon, 31 Oct 2011 15:54:02 +0000 |
parents | 5eec623db50a |
children | 6f83d9d434f2 |
rev | line source |
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1797
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Polygon2D: moved 2D vector operation to separate class.
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1 package de.intevation.flys.geom; |
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2 |
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3 import java.awt.geom.Point2D; |
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4 |
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5 public final class VectorUtils |
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6 { |
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7 public static final double EPSILON = 1e-4; |
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8 |
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9 private VectorUtils() { |
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10 } |
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11 |
1799
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Polygon2D: More code to build polygons from curve.
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12 public static final double X(Point2D p) { |
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13 return p.getX(); |
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14 } |
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15 |
1799
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Polygon2D: More code to build polygons from curve.
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16 public static final double Y(Point2D p) { |
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17 return p.getY(); |
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18 } |
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19 |
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20 public static final Point2D sub(Point2D a, Point2D b) { |
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21 return new Point2D.Double(X(a)-X(b), Y(a)-Y(b)); |
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22 } |
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23 |
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24 public static final double dot(Point2D a, Point2D b) { |
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25 return X(a)*X(b) + Y(a)*Y(b); |
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26 } |
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27 |
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28 public static final Point2D add(Point2D a, Point2D b) { |
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29 return new Point2D.Double(X(a)+X(b), Y(a)+Y(b)); |
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30 } |
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31 |
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32 public static final Point2D negate(Point2D a) { |
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33 return new Point2D.Double(-X(a), -Y(a)); |
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34 } |
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35 |
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36 public static final Point2D ortho(Point2D a) { |
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37 return new Point2D.Double(-Y(a), X(a)); |
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38 } |
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Polygon2D: moved 2D vector operation to separate class.
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39 |
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40 public static final Point2D scale(Point2D a, double s) { |
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41 return new Point2D.Double(s*X(a), s*Y(a)); |
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42 } |
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43 |
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44 public static final double lengthSq(Point2D a) { |
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45 double x = X(a); |
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46 double y = Y(a); |
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47 return x*x + y*y; |
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48 } |
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49 |
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50 public static final double length(Point2D a) { |
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51 return Math.sqrt(lengthSq(a)); |
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52 } |
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53 |
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54 public static final Point2D normalize(Point2D a) { |
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55 double length = length(a); |
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56 return length != 0d |
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57 ? scale(a, 1d/length) |
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58 : new Point2D.Double(X(a), Y(a)); |
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59 } |
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60 |
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61 public static final double L1(Point2D a, Point2D b) { |
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62 return Math.abs(X(a)-X(b)) + Math.abs(Y(a)-Y(b)); |
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63 } |
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64 |
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65 public static final boolean collinear(Point2D a, Point2D b, Point2D c) { |
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66 double x1 = X(a); |
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67 double y1 = Y(a); |
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68 double x2 = X(b); |
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69 double y2 = Y(b); |
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70 double x3 = X(c); |
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71 double y3 = Y(c); |
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72 |
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73 return Math.abs((x2-x1)*(y3-y1)-(y2-y1)*(x3-x1)) < EPSILON; |
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74 } |
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75 |
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76 public static boolean epsilonEquals(Point2D a, Point2D b) { |
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77 return Math.abs(X(a)-X(b)) < EPSILON |
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78 && Math.abs(Y(a)-Y(b)) < EPSILON; |
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79 } |
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80 |
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81 } |
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82 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 : |