/data/refman/pasoursint/CMSSW_4_1_8_patch9/src/TrackPropagation/RungeKutta/interface/FrameChanger.h

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#ifndef FrameChanger_H
#define FrameChanger_H

#include "DataFormats/GeometrySurface/interface/Plane.h"
#include "DataFormats/GeometrySurface/interface/ReferenceCounted.h"

class FrameChanger {
public:
    template <typename T>
    static
    Plane transformPlane( const Plane& plane, const GloballyPositioned<T>& frame) {
        typedef GloballyPositioned<T>                  Frame;
        typename Plane::RotationType rot = plane.rotation() * frame.rotation().transposed();
        typename Frame::LocalPoint lpos = frame.toLocal(plane.position());
        typename Plane::PositionType pos( lpos.basicVector()); // cheat!
        return Plane(pos, rot);
    }


    template <typename T, typename U>
    static
    GloballyPositioned<T> toFrame( const GloballyPositioned<T>& plane, 
                                   const GloballyPositioned<U>& frame) {
        typedef GloballyPositioned<T>                  Plane;
        typedef GloballyPositioned<U>                  Frame;

        typename Plane::RotationType rot = plane.rotation() * frame.rotation().transposed();
        typename Frame::LocalPoint lpos = frame.toLocal(plane.position());
        typename Plane::PositionType pos( lpos.basicVector()); // cheat!
        return Plane( pos, rot);

    }

};

#endif