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Sourcecode: r-cran-mapproj version File versions  Download package

conic.c

/* RSB #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);
}

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