view backend/src/main/java/org/dive4elements/river/importer/parsers/tim/Line.java @ 6328:53d08f33d094

Backend: Moved guessing of main values and there time intervals out of the STA parser. Same come will be useful to extend the WST parser to better handle official lines.
author Sascha L. Teichmann <teichmann@intevation.de>
date Thu, 13 Jun 2013 17:15:34 +0200
parents 4c3ccf2b0304
children
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/* 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;
    }
}
// vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 :

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