triad.H

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License
    This file is part of OpenFOAM.
 
    OpenFOAM 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.
 
    OpenFOAM 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 OpenFOAM.  If not, see <http://www.gnu.org/licenses/>.
 
Class
    Foam::triad
 
Description
    Representation of a 3D Cartesian coordinate system as a Vector of vectors.
 
See also
    Foam::quaternion
 
SourceFiles
    triadI.H
    triad.C
 
\*---------------------------------------------------------------------------*/
 
#ifndef triad_H
#define triad_H
 
#include "vector.H"
#include "tensor.H"
#include "contiguous.H"
 
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
namespace Foam
{
 
// Forward declaration of classes
class Istream;
class Ostream;
 
// Forward declaration of friend functions and operators
class triad;
Istream& operator>>(Istream&, triad&);
Ostream& operator<<(Ostream&, const triad&);
 
class quaternion;
 
/*---------------------------------------------------------------------------*\
                            Class triad Declaration
\*---------------------------------------------------------------------------*/
 
class triad
:
    public Vector<vector>
{
 
public:
 
    // Constructors
 
        //- Construct null
        inline triad();
 
        //- Construct from components
        inline triad(const Vector<vector>& vv);
 
        //- Construct from coordinate axes
        inline triad(const vector& x, const vector& y, const vector& z);
 
        //- Construct from a primary axis with the other two unset
        inline triad(const vector& pa);
 
        //- Construct from a quaternion
        triad(const quaternion& q);
 
        //- Construct from a tensor
        triad(const tensor& t);
 
        //- Construct from Istream
        inline triad(Istream&);
 
 
    // Static Data Members
 
        static const triad I;
        static const triad unset;
 
 
    // Member Functions
 
        //- Is the vector in the direction d set
        inline bool set(const direction d) const;
 
        //- Are all the vector set
        inline bool set() const;
 
        //- Return the primary direction of the vector v
        static inline direction primaryDirection(const vector& v);
 
        //- Return the vector orthogonal to the two provided
        static inline vector orthogonal(const vector& v1, const vector& v2);
 
        //- Orthogonalise this triad so that it is ortho-normal
        void orthogonalise();
 
        //- Normalise each set axis vector to have a unit magnitude
        void normalise();
 
        //- Align this triad with the given vector v
        //  by rotating the most aligned axis to be coincident with v
        void align(const vector& v);
 
        //- Sort the axes such that they are closest to the x, y and z axes
        triad sortxyz() const;
 
        //- Convert to a quaternion
        operator quaternion() const;
 
 
    // Member Operators
 
        inline void operator=(const Vector<vector>&);
 
        void operator=(const tensor& t);
 
        //- Add the triad t2 to this triad
        //  without normalising or orthogonalising
        void operator+=(const triad& t2);
 
 
    // IOstream Operators
 
        inline friend Istream& operator>>(Istream&, triad&);
        inline friend Ostream& operator<<(Ostream&, const triad&);
};
 
 
// * * * * * * * * * * * * * * * Global Functions  * * * * * * * * * * * * * //
 
//- Return a quantity of the difference between two triads
scalar diff(const triad& A, const triad& B);
 
//- Data associated with quaternion type are contiguous
template<>
inline bool contiguous<triad>() {return true;}
 
 
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
} // End namespace Foam
 
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
#include "triadI.H"
 
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
#endif
 
// ************************************************************************* //