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#ifndef __CGLA_MAT4X4D_H__
#define __CGLA_MAT4X4D_H__

#include "ExceptionStandard.h"
#include "CGLA.h"
#include "Vec3d.h"
#include "Vec3Hf.h"
#include "Vec4d.h"
#include "ArithSqMat4x4Float.h"


namespace CGLA {


        /** Four by four float matrix.
                        This class is useful for transformations such as perspective projections 
                        or translation where 3x3 matrices do not suffice. */
        class Mat4x4d: public ArithSqMat4x4Float<Vec4d, Mat4x4d>
        {
        public:
  
                /// Construct a Mat4x4d from four Vec4d vectors
                Mat4x4d(Vec4d _a, Vec4d _b, Vec4d _c, Vec4d _d): 
                        ArithSqMat4x4Float<Vec4d, Mat4x4d> (_a,_b,_c,_d) {}
  
                /// Construct the nan matrix
                Mat4x4d() {}

                /// Construct a matrix with identical elements.
                Mat4x4d(double a): 
                        ArithSqMat4x4Float<Vec4d, Mat4x4d> (a) {}

                /// Construct from a pointed to array of 16 floats.
                Mat4x4d(const float* sa): ArithSqMat4x4Float<Vec4d, Mat4x4d> (sa) {}
        };

        /// Create a rotation _matrix. Rotates about one of the major axes.
        Mat4x4d rotation_Mat4x4d(CGLA::Axis axis, float angle);

        /// Create a translation matrix
        Mat4x4d translation_Mat4x4d(const Vec3d&);

        /// Create a scaling matrix.
        Mat4x4d scaling_Mat4x4d(const Vec3d&);

        /// Create an identity matrix.
        inline Mat4x4d identity_Mat4x4d()
        {
                return Mat4x4d(Vec4d(1,0,0,0), 
                                                                         Vec4d(0,1,0,0), 
                                                                         Vec4d(0,0,1,0), 
                                                                         Vec4d(0,0,0,1));
        }

        /** Create a perspective matrix. Assumes the eye is at the origin and
                        that we are looking down the negative z axis.
    
                        ACTUALLY THE EYE IS NOT AT THE ORIGIN BUT BEHIND IT. CHECK UP ON
                        THIS ONE */
        Mat4x4d perspective_Mat4x4d(float d);


}
#endif