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/************************************************************************* 
* This head file is for 3D scene script. We will define a scene class    * 
* with some light and camera and models.                                 * 
*************************************************************************/ 
#ifndef _CAMERA_H__ 
#define _CAMERA_H__ 
 
#include "..\inc\GeomCalc\cadbase.h" 
 
#define	VIEW_FRONT		0 
#define	VIEW_BACK		1 
#define VIEW_TOP		2 
#define	VIEW_BOTTOM		3 
#define VIEW_RIGHT		4 
#define	VIEW_LEFT		5 
#define VIEW_SW_ISOMETRIC	6 
#define VIEW_SE_ISOMETRIC	7 
#define VIEW_NE_ISOMETRIC	8 
#define VIEW_NW_ISOMETRIC	9 
 
#define ZOOM_ALL		9 
#define ZOOM_IN			10 
#define ZOOM_OUT		11 
 
class AFX_EXT_CLASS GCamera 
{ 
 
protected: 
	//eye coordinator 
    CPoint3D	m_eye; 
	CPoint3D	m_ref; 
	CVector3D	m_vecUp; 
 
	//viewing volume 
    double		m_far, m_near; 
	double	 	m_width,m_height; 
 
	//viewport 
	double			m_screen[2]; 
 
	//classical views 
	int 			m_view_type; 
public: 
    GCamera(); 
	~GCamera(); 
 
	//initailizing 
	void init(); 
 
 
    void projection(); 
	void selection(int xPos,int yPos); 
 
	//zooming 
    void zoom(double scale);  
	void zoom_all(double x0,double y0,double z0,double x1,double y1,double z1); 
 
	//switch into a classical view 
    void set_view_type(int type); 
 
	//set viewport acoording to window 
	void set_screen( int x, int y); 
 
	//set eye coordinate 
	void set_eye(double eye_x,double eye_y,double eye_z); 
	void set_ref(double ref_x,double ref_y,double ref_z); 
	void set_vecUp(double up_dx,double up_dy,double up_dz); 
 
	//set viewing volume 
	void set_view_rect(double width,double height); 
	void get_view_rect(double& width,double& height); 
 
protected: 
    void update_upVec(); 
}; 
#endif  
 
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