typedef struct {
    int none;
    int r,g,b;
} COLOR;

#define CTYPE_PIE  0
#define CTYPE_BAR  1

int plot ( int ctype, struct Map_info *Map, int type, int field,
	       char *columns, int ncols, char *sizecol, int size, double scale,
	              COLOR *ocolor, COLOR *colors, int y_center, double *max_reference);
int pie ( double cx, double cy, int size, double *val, int ncols, COLOR *ocolor, COLOR *colors );
int bar ( double cx, double cy, int size, double scale, double *val, int ncols, COLOR *ocolor, COLOR *colors, int y_center, double *max_reference);