teichmann@5844: /* Copyright (C) 2011, 2012, 2013 by Bundesanstalt für Gewässerkunde
teichmann@5844:  * Software engineering by Intevation GmbH
teichmann@5844:  *
teichmann@5992:  * This file is Free Software under the GNU AGPL (>=v3)
teichmann@5844:  * and comes with ABSOLUTELY NO WARRANTY! Check out the
teichmann@5992:  * documentation coming with Dive4Elements River for details.
teichmann@5844:  */
teichmann@5844: 
teichmann@5829: package org.dive4elements.river.importer;
sascha@1204: 
felix@4707: 
felix@4707: /** Two doubles and an int index. */
sascha@1204: public class XY
sascha@1204: implements   Comparable<XY>
sascha@1204: {
sascha@1204:     public static final double X_EPSILON = 1e-4;
sascha@1204: 
sascha@1204:     protected double x;
sascha@1204:     protected double y;
sascha@1204:     protected int    index;
sascha@1204: 
sascha@1204:     public XY() {
sascha@1204:     }
sascha@1204: 
teichmann@5083:     public XY(XY other) {
teichmann@5083:         this(other.x, other.y, other.index);
teichmann@5083:     }
teichmann@5083: 
sascha@1204:     public XY(double x, double y, int index) {
sascha@1204:         this.x     = x;
sascha@1204:         this.y     = y;
sascha@1204:         this.index = index;
sascha@1204:     }
sascha@1204: 
sascha@1204:     @Override
sascha@1204:     public int compareTo(XY other) {
sascha@1204:         if (x + X_EPSILON < other.x) return -1;
sascha@1204:         if (x > other.x + X_EPSILON) return +1;
sascha@1204:         if (index < other.index)     return -1;
sascha@1204:         if (index > other.index)     return +1;
sascha@1204:         return 0;
sascha@1204:     }
sascha@1204: 
sascha@1204:     public double getX() {
sascha@1204:         return x;
sascha@1204:     }
sascha@1204: 
sascha@1204:     public void setX(double x) {
sascha@1204:         this.x = x;
sascha@1204:     }
sascha@1204: 
sascha@1204:     public double getY() {
sascha@1204:         return y;
sascha@1204:     }
sascha@1204: 
sascha@1204:     public void setY(double y) {
sascha@1204:         this.y = y;
sascha@1204:     }
sascha@1204: 
sascha@1204:     public int getIndex() {
sascha@1204:         return index;
sascha@1204:     }
sascha@1204: 
sascha@1204:     public void setIndex(int index) {
sascha@1204:         this.index = index;
sascha@1204:     }
teichmann@5083: 
teichmann@5083:     public double dot(double ox, double oy) {
teichmann@5083:         return x*ox + y*oy;
teichmann@5083:     }
teichmann@5083: 
teichmann@5083:     public double dot(XY other) {
teichmann@5083:         return dot(other.x, other.y);
teichmann@5083:     }
teichmann@5083: 
teichmann@5083:     public XY sub(XY other) {
teichmann@5083:         x -= other.x;
teichmann@5083:         y -= other.y;
teichmann@5083:         return this;
teichmann@5083:     }
teichmann@5083: 
teichmann@5083:     public XY ortho() {
teichmann@5083:         double z = x;
teichmann@5083:         x = y;
teichmann@5083:         y = -z;
teichmann@5083:         return this;
teichmann@5083:     }
teichmann@5083: 
teichmann@5083:     public XY normalize() {
teichmann@5083:         double len = dot(this);
teichmann@5083: 
teichmann@5083:         if (len > 1e-6) {
teichmann@5083:             len = 1d/Math.sqrt(len);
teichmann@5083:             x *= len;
teichmann@5083:             y *= len;
teichmann@5083:         }
teichmann@5083: 
teichmann@5083:         return this;
teichmann@5083:     }
teichmann@5083: 
teichmann@5083:     // x*nx + y*ny + d = 0 <=> d = -x*nx -y*ny
teichmann@5083:     public double lineOffset(XY p) {
teichmann@5083:          return -x*p.x -y*p.y;
teichmann@5083:     }
sascha@1204: }
sascha@1204: // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 :