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//BASE.H头文件 
#ifndef _BASE_H_ 
#define _BASE_H_ 
 
// 如果距离小于DISTANCE_ZERO，则认为该距离为0 
#ifndef DISTANCE_ZERO 
#define DISTANCE_ZERO 1.e-6  
#endif 
#define PI			acos(-1) 
//定义包围盒,用于拾取 
typedef struct _box2d BOX2D ; 
struct _box2d 
{ 
    double      min[2], max[2] ; // 定义最大和最小坐标值 
} ; 
 
//定义位置类 
class Position	{ 
public: 
	double 		x; 
	double 		y;		 
public:	 
	Position(); 
	Position(double ox, double oy); 
	Position(const double *pnt); 
	Position(const Position& positionSrc); 
	~Position(); 
	void 	Init(); // 初始化成员变量 
	      
	const 	Position& operator=(const Position& positionSrc); 
	void	Set(double x, double y); 
	void	Set(const double *pnt); 
	friend	Position  operator+(const Position& position1,const Position& position2); 
	friend	Position  operator-(const Position& position1,const Position& position2); 
	friend	Position  operator*(const Position& position, const double& scale); 
	friend	Position  operator*(const double& scale,const Position& position); 
	const	Position& operator+=(const Position& positionSrc); 
	const 	Position& operator-=(const Position& positionSrc); 
	const	Position& operator*=(const double& scale); 
	double	Distance(const Position& pnt); 
	BOOL	IsSame(const Position& pointSrc); 
	BOOL	IsInBox(const BOX2D& box); 
	Position Offset(const double & deltax,const double & deltay); 
	Position Offset(const Position& off); 
	Position Rotate(const Position& basePos, const double angle) ; 
	Position Mirror(const Position& pos1, const Position& pos2) ; 
	void Serialize(CArchive &ar) ; 
}; 
//多边形顶点的链表结点 
typedef struct _poly POLYP ; 
struct _poly 
{ 
    Position  p ;  
	POLYP*    next; 
} ; 
//计算线段pos1--pos2与水平轴夹角的函数 
double GetAngleToXAxis(const Position& pos1,const Position& pos2); 
#endif