typedef Vector2<double> v2; // or whatever vector you're usingclass camera{public:	v2	m_axes[2];				// x and y axes as represented by rotation and scale	v2	m_viewport_center;			// center of screen	v2	m_origin;				// origin of camera in screen coordinates	double	m_scale;				// 1 world cordinate is this many pixels on the screen 	double	m_rotation;				// rotation of camera, in radians	public:	cammera() : 		m_rotation( 0.0 ), 		m_scale( 32.0 ), 		m_origin( 0.0, 0.0 ), 		m_viewport_center( 0.0, 0.0 ),	{		update();	}		~camera() { }		void update()	{		m_axes[0] = v2( cos( m_rotation ), sin( m_rotation ) ) * m_scale; // Here we set the x-axis to be the x-component of a rotated vector (length of scale -- one unit = "scale" pixels)		m_axes[1] = m_axes[0].perpendicular(); // get the y-component of the rotated vector	}		v2 project( const v2 &p ) const	{		// Here's where the magic happens:		return ( (p.x - m_origin.x) * m_axes[0] + 			 (p.y - m_origin.y) * m_axes[1] ).inv_y() +  // where inv_y() returns v2( x, -y )			m_viewport_center;	}};class player{private:	wtf_lol_sprite	*m_my_sprite;  // Or whatever drawing method you're using		v2		m_my_position;	double		m_my_rotation;	/* ... */	public:	/* ... */		void draw( const camera &cam_ref )	{		v2 projected_position = cam_ref.project( m_my_pos );				m_my_sprite->render_ex( 			projected_position.x,  	//	x position on screen for sprite			projected_position.y,	//	y position on screen for sprite			cam_ref.m_scale * 3.0 * (1.0/256.0), 	//	scale of sprite (player's size is 3 units, and the sprite is 256 pixels in size )			m_my_rotation -cam_ref.m_rotation );	//	rotation of sprite	}};