/* Copyright (C) 2011, 2012, 2013 by Bundesanstalt für Gewässerkunde
 * Software engineering by Intevation GmbH
 *
 * This file is Free Software under the GNU AGPL (>=v3) 
 * and comes with ABSOLUTELY NO WARRANTY! Check out the
 * documentation coming with Dive4Elements River for details. 
 */

package org.dive4elements.river.importer.parsers.tim;

/** Two coordinates and a helper. */
public class Line {

    public Coordinate a;
    public Coordinate b;

    public Line() {
    }

    public Line(Coordinate a, Coordinate b) {
        this.a = a;
        this.b = b;
    }

    /** Project coordinate to line. */
    public double distanceToFirst(Coordinate c) {

        double nx = b.x - a.x;
        double ny = b.y - a.y;

        double len = Math.sqrt(nx*nx + ny*ny);

        nx /= len;
        ny /= len;

        double px = c.x - a.x;
        double py = c.y - a.y;

        return nx*px + ny*py;
    }
}
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