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#define PJ_LIB__
#include <errno.h>
#include "projects.h"
struct pj_opaque {
double A;
};
PROJ_HEAD(putp3, "Putnins P3") "\n\tPCyl, Sph";
PROJ_HEAD(putp3p, "Putnins P3'") "\n\tPCyl, Sph";
#define C 0.79788456
#define RPISQ 0.1013211836
static XY s_forward (LP lp, PJ *P) { /* Spheroidal, forward */
XY xy = {0.0,0.0};
xy.x = C * lp.lam * (1. - P->opaque->A * lp.phi * lp.phi);
xy.y = C * lp.phi;
return xy;
}
static LP s_inverse (XY xy, PJ *P) { /* Spheroidal, inverse */
LP lp = {0.0,0.0};
lp.phi = xy.y / C;
lp.lam = xy.x / (C * (1. - P->opaque->A * lp.phi * lp.phi));
return lp;
}
PJ *PROJECTION(putp3) {
struct pj_opaque *Q = pj_calloc (1, sizeof (struct pj_opaque));
if (0==Q)
return pj_default_destructor (P, ENOMEM);
P->opaque = Q;
Q->A = 4. * RPISQ;
P->es = 0.;
P->inv = s_inverse;
P->fwd = s_forward;
return P;
}
PJ *PROJECTION(putp3p) {
struct pj_opaque *Q = pj_calloc (1, sizeof (struct pj_opaque));
if (0==Q)
return pj_default_destructor (P, ENOMEM);
P->opaque = Q;
Q->A = 2. * RPISQ;
P->es = 0.;
P->inv = s_inverse;
P->fwd = s_forward;
return P;
}
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