LengthLocationMap.h

/**********************************************************************
 *
 * GEOS - Geometry Engine Open Source
 * http://geos.osgeo.org
 *
 * Copyright (C) 2011 Sandro Santilli <strk@keybit.net>
 * 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