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#define M_PI  3.1415926535897932285 
#define M_PI2 6.2831853071795864570 
 
// 
// common function in draw 
// 
 
extern double _Global_Ratio; 
 
int FLTtoINT(float x); 
int DBLtoINT(double x); 
 
void Arc_f(CDC* dc,double xc,double yc,double a,double b,double xs,double ys,double xe,double ye); 
void Arc_f(CDC* dc,double xc,double yc,double r,double xs,double ys,double xe,double ye); 
void Circle_f(CDC* dc,double xc,double yc,double r); 
void Line_f(CDC* dc,double xs,double ys,double xe,double ye); 
void MoveTo_f(CDC* dc,double x,double y); 
void LineTo_f(CDC* dc,double x,double y); 
void DrawHArrow(CDC *dc,double x,double y); 
void DrawVArrow(CDC *dc,double x,double y); 
void DrawRectangle(CDC* dc,double xmin,double xmax,double ymin,double ymax);