class vector
{
public:
float x,y,z,w;
inline vector()
{ ; };
inline vector(float x0,float y0,float z0)
{ x=x0; y=y0; z=z0; };
inline vector(float x0,float y0,float z0,float w0)
{ x=x0; y=y0; z=z0; w=w0; };
inline vector(vector &v)
{ *this=v; };
inline void null(void)
{ x=y=z=0; };
inline float length(void)
{ return (float)sqrt(x*x+y*y+z*z); };
inline void vec(float x0,float y0,float z0)
{ x=x0; y=y0; z=z0; };
inline void negate(void)
{ x=-x; y=-y; z=-z; };
inline void cross(vector& v1,vector& v2)
{
x=v1.y*v2.z-v1.z*v2.y;
y=v1.z*v2.x-v1.x*v2.z;
z=v1.x*v2.y-v1.y*v2.x;
}
inline void normalize(void)
{
float len=(float)sqrt(x*x+y*y+z*z);
if (len==0.0f) return; x/=len; y/=len; z/=len;
}
inline float& operator[](int i)
{ return (&x)[i]; };
};
| Member | Type | Description |
|---|---|---|
| x | float | vector co-ordinate in the X axis |
| y | float | vector co-ordinate in the Y axis |
| z | float | vector co-ordinate in the Z axis |
constructors, null, length, vec, negate, cross, normalize, operator[]
This class implements a 3D vector with four co-ordinates x, y, z and w. It is used for specifying points in 3D space, directions, velocity, force and also color (x is red, y is green, z is blue and w is alpha). The w co-ordinate is usually set to 1.0 when using the vector to represent 3D points and from 0.0 to 1.0 when using it as the color alpha value.