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#define PJ_LIB__
#include <errno.h>
#include "projects.h"
struct pj_opaque {
double A, B;
};
PROJ_HEAD(putp5, "Putnins P5") "\n\tPCyl., Sph.";
PROJ_HEAD(putp5p, "Putnins P5'") "\n\tPCyl., Sph.";
#define C 1.01346
#define D 1.2158542
static XY s_forward (LP lp, PJ *P) { /* Spheroidal, forward */
XY xy = {0.0,0.0};
struct pj_opaque *Q = P->opaque;
xy.x = C * lp.lam * (Q->A - Q->B * sqrt(1. + D * 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};
struct pj_opaque *Q = P->opaque;
lp.phi = xy.y / C;
lp.lam = xy.x / (C * (Q->A - Q->B * sqrt(1. + D * lp.phi * lp.phi)));
return lp;
}
PJ *PROJECTION(putp5) {
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.;
Q->B = 1.;
P->es = 0.;
P->inv = s_inverse;
P->fwd = s_forward;
return P;
}
PJ *PROJECTION(putp5p) {
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 = 1.5;
Q->B = 0.5;
P->es = 0.;
P->inv = s_inverse;
P->fwd = s_forward;
return P;
}
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