Transformation.h

/*
    Hyperspace Explorer - vizualizing higher-dimensional geometry
    Copyright (C) 2010  Lene Preuss <lene.preuss@gmail.com>

    This program 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 2 of the License, or
    (at your option) any later version.

    This program is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.

    You should have received a copy of the GNU General Public License along
    with this program; if not, write to the Free Software Foundation, Inc.,
    51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.

*/

#ifndef TRANSFORMATION_H
#define TRANSFORMATION_H

#include "FunctionValueGrid.h"

#include "Rotation.h"

namespace TransformationUtil {
    template <unsigned N, typename NUM = double>
    inline VecMath::Vector<N, NUM> perform(
        const VecMath::Vector<N, NUM> &x,
        const VecMath::Matrix<N, NUM> &rot,
        const VecMath::Vector<N, NUM> &trans,
        const VecMath::Vector<N, NUM> &scale
    ) {
        return VecMath::scale(rot*(x+trans), scale);
    }
    
}


template <unsigned N, unsigned P, typename NUM = double>
class Transformation {

public:

    typedef typename FunctionValueGrid< N, P, NUM >::value_storage_type value_storage_type;

    static inline VecMath::Vector<N, NUM> perform(
        const VecMath::Vector<N, NUM> &x,
        const VecMath::Matrix<N, NUM> &rot,
        const VecMath::Vector<N, NUM> &trans,
        const VecMath::Vector<N, NUM> &scale
    ) {
        return TransformationUtil::perform(x, rot, trans, scale);
    }


    virtual value_storage_type transform(const value_storage_type &operand) const = 0;

    virtual ~Transformation() { }

protected:

    Transformation() { }


    Transformation(const VecMath::Rotation<N, NUM> &rotation,
                   const VecMath::Vector<N, NUM> &translation,
                   const VecMath::Vector<N, NUM> &scale);

};

class TransformationFactory;


template <unsigned N, unsigned P, typename NUM = double>
class TransformationImpl: public Transformation< N, P, NUM > {

public:

    typedef typename FunctionValueGrid< N, P, NUM >::value_storage_type value_storage_type;

protected:


    TransformationImpl(const VecMath::Rotation<N, NUM> &rotation,
                       const VecMath::Vector<N, NUM> &translation,
                       const VecMath::Vector<N, NUM> &scale);

    VecMath::Rotation<N, NUM> rotation_;      
    VecMath::Vector<N, NUM> translation_;   
    VecMath::Vector<N, NUM> scale_;         

    friend class TransformationFactory;
};

#endif // TRANSFORMATION_H