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/* ----------------------------------------------------------------------- *
 * This file is part of GEL, http://www.imm.dtu.dk/GEL
 * Copyright (C) the authors and DTU Informatics
 * For license and list of authors, see ../../doc/intro.pdf
 * ----------------------------------------------------------------------- */

/** @file Vec4d.h
 * @brief 4D double vector class.
 */

#ifndef __CGLA_VEC4D_H__
#define __CGLA_VEC4D_H__

#include "Vec3d.h"
#include "ArithVec4Float.h"

namespace CGLA {

        /** \brief A four dimensional floating point vector. 

                        This class is also used (via typedef) for
                        homogeneous vectors.
        */

        class Vec4d: public ArithVec4Float<double,Vec4d>
        {
        public:
  
                /// Construct a (0,0,0,0) homogenous Vector
                Vec4d(): ArithVec4Float<double,Vec4d>(0.0,0.0,0.0,0.0) {}

                /// Construct a (0,0,0,0) homogenous Vector
                explicit Vec4d(double _a): ArithVec4Float<double,Vec4d>(_a,_a,_a,_a) {}

                /// Construct a 4D vector
                Vec4d(double _a, double _b, double _c, double _d): 
                        ArithVec4Float<double,Vec4d>(_a,_b,_c,_d) {}

                /// Construct a homogenous vector (a,b,c,1)
                Vec4d(double _a, double _b, double _c): 
                        ArithVec4Float<double,Vec4d>(_a,_b,_c,1.0) {}

                /// Construct a homogenous vector from a non-homogenous.
                explicit Vec4d(const Vec3d& v): 
                        ArithVec4Float<double,Vec4d>(v[0],v[1],v[2],1.0) {}

                /// Construct a homogenous vector from a non-homogenous.
                explicit Vec4d(const Vec3d& v,double _d): 
                        ArithVec4Float<double,Vec4d>(v[0],v[1],v[2],_d) {}

                operator Vec3d() const
                {
                        double k = 1.0/(*this)[3];
                        return Vec3d((*this)[0]*k,(*this)[1]*k,(*this)[2]*k);
                }
        };
}
#endif