Vector4f.h

#ifndef VECTOR_4F_H
#define VECTOR_4F_H

class Vector2f;
class Vector3f;

class Vector4f
{
public:

    Vector4f( float f = 0.f );
    Vector4f( float fx, float fy, float fz, float fw );
    Vector4f( float buffer[ 4 ] );

    Vector4f( const Vector2f& xy, float z, float w );
    Vector4f( float x, const Vector2f& yz, float w );
    Vector4f( float x, float y, const Vector2f& zw );
    Vector4f( const Vector2f& xy, const Vector2f& zw );

    Vector4f( const Vector3f& xyz, float w );
    Vector4f( float x, const Vector3f& yzw );

    // copy constructors
    Vector4f( const Vector4f& rv );

    // assignment operators
    Vector4f& operator = ( const Vector4f& rv );

    // no destructor necessary

    // returns the ith element
    const float& operator [] ( int i ) const;
    float& operator [] ( int i );

    float& x();
    float& y();
    float& z();
    float& w();

    float x() const;
    float y() const;
    float z() const;
    float w() const;

    Vector2f xy() const;
    Vector2f yz() const;
    Vector2f zw() const;
    Vector2f wx() const;

    Vector3f xyz() const;
    Vector3f yzw() const;
    Vector3f zwx() const;
    Vector3f wxy() const;

    Vector3f xyw() const;
    Vector3f yzx() const;
    Vector3f zwy() const;
    Vector3f wxz() const;

    float abs() const;
    float absSquared() const;
    void normalize();
    Vector4f normalized() const;

    // if v.z != 0, v = v / v.w
    void homogenize();
    Vector4f homogenized() const;

    void negate();

    // ---- Utility ----
    const float *getElements() const;
    void print() const;

    static float dot( const Vector4f& v0, const Vector4f& v1 );
    static Vector4f lerp( const Vector4f& v0, const Vector4f& v1, float alpha );

private:

    float m_elements[ 4 ];

};

// component-wise operators
Vector4f operator + ( const Vector4f& v0, const Vector4f& v1 );
Vector4f operator - ( const Vector4f& v0, const Vector4f& v1 );
Vector4f operator * ( const Vector4f& v0, const Vector4f& v1 );
Vector4f operator / ( const Vector4f& v0, const Vector4f& v1 );

// unary negation
Vector4f operator - ( const Vector4f& v );

// multiply and divide by scalar
Vector4f operator * ( float f, const Vector4f& v );
Vector4f operator * ( const Vector4f& v, float f );
Vector4f operator / ( const Vector4f& v, float f );

bool operator == ( const Vector4f& v0, const Vector4f& v1 );
bool operator != ( const Vector4f& v0, const Vector4f& v1 );

#endif // VECTOR_4F_H