// from quad.c  programs by Curtis T McMullen
// http://www.math.harvard.edu/~ctm/programs/home/prog/julia/src/julia.tar

/* Defaults */
#define C {0, 1}
#define CENTER {0.0,0.0}
#define RADIUS 1.5


usage()
{
	fprintf(stderr,"Usage:  quad [options]\n");
	fprintf(stderr,"  -C [c.x c.y] for z^2 + c]\n");
	fprintf(stderr,"  -c [center of window]\n");
	fprintf(stderr,"  -d [n m] nxm raster\n");
	fprintf(stderr,"  -f [(default 1.0) nhd of J to draw]\n");
	fprintf(stderr,"  -i [iteration limit]\n");
	fprintf(stderr,"  -j [just draw Julia set]\n");
	fprintf(stderr,"  -k gray [fill Julia set]\n");
	fprintf(stderr,"  -l [level] - image of |z|=2^level under\n");
	fprintf(stderr,"     Riemann mapping\n");
	fprintf(stderr,"  -p [n] show n points of post-critical orbit\n");
	fprintf(stderr,"  -s subdivision of basin of infinity\n");
	fprintf(stderr,"  -r [radius of window]\n");
	fprintf(stderr,"  -x [ang-num ang-denom level] - image of external ray\n");
	fprintf(stderr,"     at rational ang in [0,1], from level down\n");
	fprintf(stderr,"Postscript file is written to stdout.\n");
	exit(1);
}