extern  GraphData GDS_data;
extern  void cls(int mode);
extern  void width(int cn,int ln);
extern  void locate(int x,int y,int sw);
extern  void cuon(void );
extern  void cuoff(void );
extern  void color(int cl,int bc);
extern  void vattr(unsigned int attr);

extern  void gopen(void );
extern  void greset(void );
extern  void gclose(void );
extern  void gout(void );
extern  void drmode(unsigned int mode);
extern  void pset(int x,int y,unsigned int cl,unsigned int mode);
extern  void line(int x1,int y1,int x2,int y2,unsigned int mode,unsigned int cl,unsigned int bf,unsigned int ls);
extern  void paint(int x,int y,unsigned int style,unsigned int pcl,unsigned int bcn,unsigned int *bcl);
extern  void hatch(unsigned int style);
extern  void tile(unsigned int style);
extern  void symbol(int x,int y,char *str,int wm,int hm,unsigned int cl,unsigned int ac,unsigned int mode);
extern  void symbol_(int x,int y,char *str,int wm,int hm,unsigned int cl,unsigned int ac,unsigned int mode);