Matrix3X3 Class Reference

#include <utils.h>

Public Member Functions
	Matrix3X3 ()
	Matrix3X3 (vector3f x, vector3f y, vector3f z)
vector3f	diag () const
float &	operator[] (int i)
const float &	operator[] (int i) const
vector3f &	row (int i)
const vector3f &	row (int i) const
float &	operator() (int i, int j)
const float &	operator() (int i, int j) const
float &	at (int i, int j)
const float &	at (int i, int j) const
float	Determinant () const
Matrix3X3	Inverse () const
Matrix3X3	InverseTranspose () const
Matrix3X3 &	operator*= (float a)
Matrix3X3 &	operator+= (const Matrix3X3 &b)
void	dbgprint ()

Static Public Member Functions
static void	test ()

Public Attributes
float	m [9]

Detailed Description

Definition at line 267 of file utils.h.

Constructor & Destructor Documentation

Matrix3X3() [1/2]

Matrix3X3::Matrix3X3 ( )

inline

Definition at line 270 of file utils.h.

{ for(int i=0;i<9;i++) m[i]=0.0f; }

Matrix3X3() [2/2]

Matrix3X3::Matrix3X3 ( vector3f  x, vector3f  y, vector3f  z  )

inline

Definition at line 271 of file utils.h.

                                                { 
        row(0) = x;
        row(1) = y;
        row(2) = z;
    }

Member Function Documentation

at() [1/2]

float& Matrix3X3::at ( int  i, int  j  )

inline

Definition at line 288 of file utils.h.

{  return m[3*i+j]; }

at() [2/2]

const float& Matrix3X3::at ( int  i, int  j  ) const

inline

Definition at line 289 of file utils.h.

{ return m[3*i+j]; }

dbgprint()

void Matrix3X3::dbgprint ( )

inline

Definition at line 360 of file utils.h.

    {
        dbgprintf("%f\t%f\t%f\n", m[0],m[1],m[2]);
        dbgprintf("%f\t%f\t%f\n", m[3],m[4],m[5]);
        dbgprintf("%f\t%f\t%f\n", m[6],m[7],m[8]);
    }

Determinant()

float Matrix3X3::Determinant ( ) const

inline

Definition at line 291 of file utils.h.

    {
        return at(0,0)*(at(1,1)*at(2,2)-at(2,1)*at(1,2))
                            -at(0,1)*(at(1,0)*at(2,2)-at(1,2)*at(2,0))
                        +at(0,2)*(at(1,0)*at(2,1)-at(1,1)*at(2,0));
    }

diag()

vector3f Matrix3X3::diag ( ) const

inline

Definition at line 277 of file utils.h.

{ return vector3f(at(0,0),at(1,1),at(2,2)); }

Inverse()

Matrix3X3 Matrix3X3::Inverse ( ) const

inline

Definition at line 298 of file utils.h.

    {
        float det = Determinant();
        if (det != 0.0f) {
            float invdet = 1/det;
            Matrix3X3 result;
            result(0,0) =  (at(1,1)*at(2,2)-at(2,1)*at(1,2))*invdet;
            result(1,0) = -(at(0,1)*at(2,2)-at(0,2)*at(2,1))*invdet;
            result(2,0) =  (at(0,1)*at(1,2)-at(0,2)*at(1,1))*invdet;
            result(0,1) = -(at(1,0)*at(2,2)-at(1,2)*at(2,0))*invdet;
            result(1,1) =  (at(0,0)*at(2,2)-at(0,2)*at(2,0))*invdet;
            result(2,1) = -(at(0,0)*at(1,2)-at(1,0)*at(0,2))*invdet;
            result(0,2) =  (at(1,0)*at(2,1)-at(2,0)*at(1,1))*invdet;
            result(1,2) = -(at(0,0)*at(2,1)-at(2,0)*at(0,1))*invdet;
            result(2,2) =  (at(0,0)*at(1,1)-at(1,0)*at(0,1))*invdet;
            return result;
        }
        return Matrix3X3();
    }

InverseTranspose()

Matrix3X3 Matrix3X3::InverseTranspose ( ) const

inline

Definition at line 317 of file utils.h.

    {
        float det = Determinant();
        if (det != 0.0f) {
            float invdet = 1/det;
            Matrix3X3 result;
            result(0,0) =  (at(1,1)*at(2,2)-at(2,1)*at(1,2))*invdet;
            result(0,1) = -(at(0,1)*at(2,2)-at(0,2)*at(2,1))*invdet;
            result(0,2) =  (at(0,1)*at(1,2)-at(0,2)*at(1,1))*invdet;
            result(1,0) = -(at(1,0)*at(2,2)-at(1,2)*at(2,0))*invdet;
            result(1,1) =  (at(0,0)*at(2,2)-at(0,2)*at(2,0))*invdet;
            result(1,2) = -(at(0,0)*at(1,2)-at(1,0)*at(0,2))*invdet;
            result(2,0) =  (at(1,0)*at(2,1)-at(2,0)*at(1,1))*invdet;
            result(2,1) = -(at(0,0)*at(2,1)-at(2,0)*at(0,1))*invdet;
            result(2,2) =  (at(0,0)*at(1,1)-at(1,0)*at(0,1))*invdet;
            return result;
        }
        return Matrix3X3();
    }

operator()() [1/2]

float& Matrix3X3::operator() ( int  i, int  j  )

inline

Definition at line 285 of file utils.h.

{ return m[3*i+j]; }

operator()() [2/2]

const float& Matrix3X3::operator() ( int  i, int  j  ) const

inline

Definition at line 286 of file utils.h.

{ return m[3*i+j]; }

operator*=()

Matrix3X3& Matrix3X3::operator*= ( float  a )

inline

Definition at line 337 of file utils.h.

                                   {
        for(int i=0;i<9;i++) 
            m[i]*=a;
        return *this;
    }

operator+=()

Matrix3X3& Matrix3X3::operator+= ( const Matrix3X3 &  b )

inline

Definition at line 343 of file utils.h.

                                              {
        for(int i=0;i<9;i++)
            m[i]+=b[i];
        return *this;
    }

operator[]() [1/2]

float& Matrix3X3::operator[] ( int  i )

inline

Definition at line 279 of file utils.h.

{ return m[i]; }

operator[]() [2/2]

const float& Matrix3X3::operator[] ( int  i ) const

inline

Definition at line 280 of file utils.h.

{ return m[i]; }

row() [1/2]

vector3f& Matrix3X3::row ( int  i )

inline

Definition at line 282 of file utils.h.

{ return *(vector3f*)&m[i*3]; }

row() [2/2]

const vector3f& Matrix3X3::row ( int  i ) const

inline

Definition at line 283 of file utils.h.

{ return *(vector3f*)&m[i*3]; }

test()

static void Matrix3X3::test ( )

inlinestatic

Definition at line 351 of file utils.h.

    {
        Matrix3X3 t;

        for (int i=0;i<9;i++)
            t[i]=i*i;
        t.Inverse().dbgprint();
    }

Member Data Documentation

m

float Matrix3X3::m[9]

Definition at line 349 of file utils.h.

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The documentation for this class was generated from the following file:

• cputrack/utils.h