/*
 * Prototypes for libplot functions.
 */
void rarc(double, double, double, double, double, double, double);
void box(double, double, double, double);
void cfill(char *);
void circ(double, double, double);
void closepl(void);
void color(char *);
void plotdisc(double, double, double);
void dpoint(double, double);
void erase(void);
void fill(int [], double *[]);
void frame(double, double, double, double);
void grade(double);
void idle(void);
void plotline(double, double, double, double);
void move(double, double);
void openpl(char *);
void parabola(double, double, double, double, double, double);
void pen(char *);
void plotpoly(int [], double *[]);
void ppause(void);
void ptype(char *);
void range(double, double, double, double);
void restore(void);
void rmove(double, double);
void rvec(double, double);
void sbox(double, double, double, double);
void splin(int, int [], double *[]);
void text(char *);
void vec(double, double);
void save(void);
char *whoami(void);
void doublebuffer(void);