Mercurial > dive4elements > river
comparison backend/src/main/java/org/dive4elements/river/importer/XY.java @ 7730:e1b831fe435a slt-simplify-cross-sections
Merged default into slt-simplify-cross-sections branch and updated package and class names.
| author | Tom Gottfried <tom@intevation.de> |
|---|---|
| date | Mon, 20 Jan 2014 14:04:20 +0100 |
| parents | flys-backend/src/main/java/de/intevation/flys/importer/XY.java@7bbee0cfc171 flys-backend/src/main/java/de/intevation/flys/importer/XY.java@4c3ccf2b0304 |
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| 5084:ca45dd039b54 | 7730:e1b831fe435a |
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| 1 /* Copyright (C) 2011, 2012, 2013 by Bundesanstalt für Gewässerkunde | |
| 2 * Software engineering by Intevation GmbH | |
| 3 * | |
| 4 * This file is Free Software under the GNU AGPL (>=v3) | |
| 5 * and comes with ABSOLUTELY NO WARRANTY! Check out the | |
| 6 * documentation coming with Dive4Elements River for details. | |
| 7 */ | |
| 8 | |
| 9 package org.dive4elements.river.importer; | |
| 10 | |
| 11 | |
| 12 /** Two doubles and an int index. */ | |
| 13 public class XY | |
| 14 implements Comparable<XY> | |
| 15 { | |
| 16 public static final double X_EPSILON = 1e-4; | |
| 17 | |
| 18 protected double x; | |
| 19 protected double y; | |
| 20 protected int index; | |
| 21 | |
| 22 public XY() { | |
| 23 } | |
| 24 | |
| 25 public XY(XY other) { | |
| 26 this(other.x, other.y, other.index); | |
| 27 } | |
| 28 | |
| 29 public XY(double x, double y, int index) { | |
| 30 this.x = x; | |
| 31 this.y = y; | |
| 32 this.index = index; | |
| 33 } | |
| 34 | |
| 35 @Override | |
| 36 public int compareTo(XY other) { | |
| 37 if (x + X_EPSILON < other.x) return -1; | |
| 38 if (x > other.x + X_EPSILON) return +1; | |
| 39 if (index < other.index) return -1; | |
| 40 if (index > other.index) return +1; | |
| 41 return 0; | |
| 42 } | |
| 43 | |
| 44 public double getX() { | |
| 45 return x; | |
| 46 } | |
| 47 | |
| 48 public void setX(double x) { | |
| 49 this.x = x; | |
| 50 } | |
| 51 | |
| 52 public double getY() { | |
| 53 return y; | |
| 54 } | |
| 55 | |
| 56 public void setY(double y) { | |
| 57 this.y = y; | |
| 58 } | |
| 59 | |
| 60 public int getIndex() { | |
| 61 return index; | |
| 62 } | |
| 63 | |
| 64 public void setIndex(int index) { | |
| 65 this.index = index; | |
| 66 } | |
| 67 | |
| 68 public double dot(double ox, double oy) { | |
| 69 return x*ox + y*oy; | |
| 70 } | |
| 71 | |
| 72 public double dot(XY other) { | |
| 73 return dot(other.x, other.y); | |
| 74 } | |
| 75 | |
| 76 public XY sub(XY other) { | |
| 77 x -= other.x; | |
| 78 y -= other.y; | |
| 79 return this; | |
| 80 } | |
| 81 | |
| 82 public XY ortho() { | |
| 83 double z = x; | |
| 84 x = y; | |
| 85 y = -z; | |
| 86 return this; | |
| 87 } | |
| 88 | |
| 89 public XY normalize() { | |
| 90 double len = dot(this); | |
| 91 | |
| 92 if (len > 1e-6) { | |
| 93 len = 1d/Math.sqrt(len); | |
| 94 x *= len; | |
| 95 y *= len; | |
| 96 } | |
| 97 | |
| 98 return this; | |
| 99 } | |
| 100 | |
| 101 // x*nx + y*ny + d = 0 <=> d = -x*nx -y*ny | |
| 102 public double lineOffset(XY p) { | |
| 103 return -x*p.x -y*p.y; | |
| 104 } | |
| 105 } | |
| 106 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 : |