LengthLocationMap.h

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/**********************************************************************
 *
 * GEOS - Geometry Engine Open Source
 * http://geos.osgeo.org
 *
 * Copyright (C) 2011 Sandro Santilli <strk@kbt.io>
 * Copyright (C) 2005-2006 Refractions Research Inc.
 * Copyright (C) 2001-2002 Vivid Solutions Inc.
 *
 * This is free software; you can redistribute and/or modify it under
 * the terms of the GNU Lesser General Public Licence as published
 * by the Free Software Foundation.
 * See the COPYING file for more information.
 *
 **********************************************************************
 *
 * Last port: linearref/LengthLocationMap.java r463
 *
 **********************************************************************/

#ifndef GEOS_LINEARREF_LENGTHLOCATIONMAP_H
#define GEOS_LINEARREF_LENGTHLOCATIONMAP_H

#include <geos/geom/Coordinate.h>
#include <geos/geom/Geometry.h>
#include <geos/linearref/LinearLocation.h>

namespace geos {
namespace linearref { // geos::linearref

class LengthLocationMap {


private:
    const geom::Geometry* linearGeom;

    LinearLocation getLocationForward(double length) const;

    LinearLocation resolveHigher(const LinearLocation& loc) const;

public:

    // TODO: cache computed cumulative length for each vertex
    // TODO: support user-defined measures
    // TODO: support measure index for fast mapping to a location

    static LinearLocation
    getLocation(const geom::Geometry* linearGeom, double length)
    {
        LengthLocationMap locater(linearGeom);
        return locater.getLocation(length);
    }

    static LinearLocation
    getLocation(const geom::Geometry* linearGeom, double length, bool resolveLower)
    {
        LengthLocationMap locater(linearGeom);
        return locater.getLocation(length, resolveLower);
    }

    static double getLength(const geom::Geometry* linearGeom, const LinearLocation& loc);

    LengthLocationMap(const geom::Geometry* linearGeom);

    LinearLocation getLocation(double length, bool resolveLower) const;

    LinearLocation getLocation(double length) const;

    double getLength(const LinearLocation& loc) const;

};

} // geos.linearref
} // geos

#endif