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#define PJ_LIB__
#include "projects.h"
#include <errno.h>
PROJ_HEAD(wink1, "Winkel I") "\n\tPCyl., Sph.\n\tlat_ts=";
struct pj_opaque {
double cosphi1;
};
static XY s_forward (LP lp, PJ *P) { /* Spheroidal, forward */
XY xy = {0.0,0.0};
xy.x = .5 * lp.lam * (P->opaque->cosphi1 + cos(lp.phi));
xy.y = lp.phi;
return (xy);
}
static LP s_inverse (XY xy, PJ *P) { /* Spheroidal, inverse */
LP lp = {0.0,0.0};
lp.phi = xy.y;
lp.lam = 2. * xy.x / (P->opaque->cosphi1 + cos(lp.phi));
return (lp);
}
PJ *PROJECTION(wink1) {
struct pj_opaque *Q = pj_calloc (1, sizeof (struct pj_opaque));
if (0==Q)
return pj_default_destructor(P, ENOMEM);
P->opaque = Q;
P->opaque->cosphi1 = cos (pj_param(P->ctx, P->params, "rlat_ts").f);
P->es = 0.;
P->inv = s_inverse;
P->fwd = s_forward;
return P;
}
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