Subversion Repositories planix.SVN

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


int
Xorthographic(struct place *place, double *x, double *y)
{
        *x = - place->nlat.c * place->wlon.s;
        *y = - place->nlat.c * place->wlon.c;
        return(place->nlat.l<0.? 0 : 1);
}

proj
orthographic(void)
{
        return(Xorthographic);
}

int
olimb(double *lat, double *lon, double res)
{
        static first  = 1;
        if(first) {
                *lat = 0;
                *lon = -180;
                first = 0;
                return 0;
        }
        *lon += res;
        if(*lon <= 180)
                return 1;
        first = 1;
        return -1;
}