V8/usr/src/cmd/map/libmap/mecca.c

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#include "map.h"

struct coord stdpar;

Xmecca(place, x, y)
struct place *place;
float *x, *y;
{
	*x = - place->wlon.l;
	*y = -(place->nlat.c*stdpar.s -
		place->nlat.s*stdpar.c*place->wlon.c)/stdpar.c;
	if(fabs(place->wlon.l) > 0.01)
		*y *= *x/sin(*x);
	if(fabs(*y)>2.0)
		return(0);
	if(place->nlat.s*stdpar.s +
	   place->nlat.c*stdpar.c*place->wlon.c <0)
		return(-1);
	return(1);
}

int (*mecca(par))()
float par;
{
	if(fabs(par)>80.)
		return(0);
	deg2rad(par,&stdpar);
	return(Xmecca);
}