GeomHelper.h

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/****************************************************************************/
// Some geometrical helpers
/****************************************************************************/
// SUMO, Simulation of Urban MObility; see http://sumo.sourceforge.net/
// Copyright (C) 2001-2012 DLR (http://www.dlr.de/) and contributors
/****************************************************************************/
//
//   This file is part of SUMO.
//   SUMO is free software: you can redistribute it and/or modify
//   it under the terms of the GNU General Public License as published by
//   the Free Software Foundation, either version 3 of the License, or
//   (at your option) any later version.
//
/****************************************************************************/
#ifndef GeomHelper_h
#define GeomHelper_h


// ===========================================================================
// included modules
// ===========================================================================
#ifdef _MSC_VER
#include <windows_config.h>
#else
#include <config.h>
#endif

#include "Position.h"
#include "PositionVector.h"
#include <utils/common/UtilExceptions.h>


#ifndef PI
#define PI 3.1415926535897932384626433832795
#endif

// ===========================================================================
// class definitions
// ===========================================================================
class GeomHelper {
public:
    static bool intersects(
            SUMOReal x1, SUMOReal y1, SUMOReal x2, SUMOReal y2,
            SUMOReal x3, SUMOReal y3, SUMOReal x4, SUMOReal y4);

    static bool intersects(const Position& p11, const Position& p12,
                           const Position& p21, const Position& p22);

    static Position intersection_position(
            const Position& p11, const Position& p12, 
            const Position& p21, const Position& p22);

    static SUMOReal Angle2D(SUMOReal x1, SUMOReal y1, SUMOReal x2, SUMOReal y2);

    static Position interpolate(const Position& p1,
                                const Position& p2, SUMOReal length);

    static Position extrapolate_first(const Position& p1,
                                      const Position& p2, SUMOReal length);

    static Position extrapolate_second(const Position& p1,
                                       const Position& p2, SUMOReal length);

    static SUMOReal nearest_position_on_line_to_point2D(
        const Position& l1, const Position& l2,
        const Position& p, bool perpendicular = true);

    static SUMOReal distancePointLine(const Position& point,
                                      const Position& lineStart, const Position& lineEnd);

    static SUMOReal closestDistancePointLine(const Position& point,
            const Position& lineStart, const Position& lineEnd,
            Position& outIntersection);

    static Position transfer_to_side(Position& p,
                                     const Position& lineBeg, const Position& lineEnd,
                                     SUMOReal amount);


    static Position crossPoint(const Boundary& b,
                               const PositionVector& v);

    static std::pair<SUMOReal, SUMOReal> getNormal90D_CW(const Position& beg,
            const Position& end, SUMOReal length, SUMOReal wanted_offset);

    static std::pair<SUMOReal, SUMOReal> getNormal90D_CW(const Position& beg,
            const Position& end, SUMOReal wanted_offset);

    static SUMOReal getCCWAngleDiff(SUMOReal angle1, SUMOReal angle2) ;


    static SUMOReal getCWAngleDiff(SUMOReal angle1, SUMOReal angle2) ;


    static SUMOReal getMinAngleDiff(SUMOReal angle1, SUMOReal angle2) ;


    static SUMOReal getMaxAngleDiff(SUMOReal angle1, SUMOReal angle2) ;


};


#endif

/****************************************************************************/