Subversion Repositories planix.SVN

#include <u.h>
#include <libc.h>
#include "map.h"

static struct coord stdpar;

static int
Xconic(struct place *place, double *x, double *y)
{
        double r;
        if(fabs(place->nlat.l-stdpar.l) > 80.*RAD)
                return(-1);
        r = stdpar.c/stdpar.s - tan(place->nlat.l - stdpar.l);
        *x = - r*sin(place->wlon.l * stdpar.s);
        *y = - r*cos(place->wlon.l * stdpar.s);
        if(r>3) return(0);
        return(1);
}

proj
conic(double par)
{
        if(fabs(par) <.1)
                return(Xcylindrical);
        deg2rad(par, &stdpar);
        return(Xconic);
}