teichmann@5829: package org.dive4elements.river.importer.parsers.tim;
sascha@4732: 
felix@4742: /** Two coordinates and a helper. */
sascha@4732: public class Line {
sascha@4732: 
sascha@4732:     public Coordinate a;
sascha@4732:     public Coordinate b;
sascha@4732: 
sascha@4732:     public Line() {
sascha@4732:     }
sascha@4732: 
sascha@4732:     public Line(Coordinate a, Coordinate b) {
sascha@4732:         this.a = a;
sascha@4732:         this.b = b;
sascha@4732:     }
sascha@4732: 
sascha@4732:     /** Project coordinate to line. */
sascha@4732:     public double distanceToFirst(Coordinate c) {
sascha@4732: 
sascha@4732:         double nx = b.x - a.x;
sascha@4732:         double ny = b.y - a.y;
sascha@4732: 
sascha@4732:         double len = Math.sqrt(nx*nx + ny*ny);
sascha@4732: 
sascha@4732:         nx /= len;
sascha@4732:         ny /= len;
sascha@4732: 
sascha@4732:         double px = c.x - a.x;
sascha@4732:         double py = c.y - a.y;
sascha@4732: 
sascha@4732:         return nx*px + ny*py;
sascha@4732:     }
sascha@4732: }
sascha@4732: // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 :