LocationIndexedLine.h

/**********************************************************************
 *
 * GEOS - Geometry Engine Open Source
 * http://geos.osgeo.org
 *
 * Copyright (C) 2011 Sandro Santilli <strk@kbt.io>
 *
 * 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/LocationIndexedLine.java r466
 *
 **********************************************************************/
 
#pragma once
 
#include <geos/export.h>
#include <geos/geom/Coordinate.h>
#include <geos/geom/Geometry.h>
#include <geos/linearref/ExtractLineByLocation.h>
#include <geos/linearref/LinearLocation.h>
#include <geos/linearref/LocationIndexOfPoint.h>
#include <geos/linearref/LocationIndexOfLine.h>
#include <geos/util/IllegalArgumentException.h>
 
namespace geos {
namespace linearref { // geos::linearref
 
class GEOS_DLL LocationIndexedLine {
private:
    const geom::Geometry* linearGeom;
 
    void
    checkGeometryType()
    {
        if(!linearGeom->isLineal()) {
            throw util::IllegalArgumentException("Input geometry must be linear");
        }
    }
 
public:
 
    LocationIndexedLine(const geom::Geometry* p_linearGeom)
        : linearGeom(p_linearGeom)
    {
        checkGeometryType();
    }
 
    geom::Coordinate
    extractPoint(const LinearLocation& index) const
    {
        return index.getCoordinate(linearGeom);
    }
 
 
    geom::Coordinate
    extractPoint(const LinearLocation& index,
                 double offsetDistance) const
    {
        geom::Coordinate ret;
        index.getSegment(linearGeom)->pointAlongOffset(
            index.getSegmentFraction(), offsetDistance, ret
        );
        return ret;
    }
 
    std::unique_ptr<geom::Geometry>
    extractLine(const LinearLocation& startIndex,
                const LinearLocation& endIndex) const
    {
        return ExtractLineByLocation::extract(linearGeom, startIndex, endIndex);
    }
 
 
    LinearLocation
    indexOf(const geom::Coordinate& pt) const
    {
        return LocationIndexOfPoint::indexOf(linearGeom, pt);
    }
 
    LinearLocation
    indexOfAfter(const geom::Coordinate& pt,
                 const LinearLocation& minIndex) const
    {
        return LocationIndexOfPoint::indexOfAfter(linearGeom, pt, &minIndex);
    }
 
    LinearLocation*
    indicesOf(const geom::Geometry* subLine) const
    {
        return LocationIndexOfLine::indicesOf(linearGeom, subLine);
    }
 
 
    LinearLocation
    project(const geom::Coordinate& pt) const
    {
        return LocationIndexOfPoint::indexOf(linearGeom, pt);
    }
 
    LinearLocation
    getStartIndex() const
    {
        return LinearLocation();
    }
 
    LinearLocation
    getEndIndex() const
    {
        return LinearLocation::getEndLocation(linearGeom);
    }
 
    bool
    isValidIndex(const LinearLocation& index) const
    {
        return index.isValid(linearGeom);
    }
 
 
    LinearLocation
    clampIndex(const LinearLocation& index) const
    {
        LinearLocation loc = index;
        loc.clamp(linearGeom);
        return loc;
    }
};
 
} // geos::linearref
} // geos