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

bicentric.c

/* RSB #include <u.h>
#include <libc.h>*/
#include "map.h"

static struct coord center;

static int
Xbicentric(struct place *place, double *x, double *y)
{
      if(place->wlon.c<=.01||place->nlat.c<=.01)
            return(-1);
      *x = -center.c*place->wlon.s/place->wlon.c;
      *y = place->nlat.s/(place->nlat.c*place->wlon.c);
      return(*x**x+*y**y<=9);
}

proj
bicentric(double l)
{
      l = fabs(l);
      if(l>89)
            return(0);
      deg2rad(l,&center);
      return(Xbicentric);
}

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