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#define PROJ_PARMS__ \
double A;
#define PJ_LIB__
# include <projects.h>
PROJ_HEAD(putp3, "Putnins P3") "\n\tPCyl., Sph.";
PROJ_HEAD(putp3p, "Putnins P3'") "\n\tPCyl., no inv., Sph.";
#define C 0.79788456
#define RPISQ 0.1013211836
FORWARD(s_forward); /* spheroid */
xy.x = C * lp.lam * (1. - P->A * lp.phi * lp.phi);
xy.y = C * lp.phi;
return (xy);
}
INVERSE(s_inverse); /* spheroid */
lp.phi = xy.y / C;
lp.lam = xy.x / (C * (1. - P->A * lp.phi * lp.phi));
return (lp);
}
FREEUP; if (P) pj_dalloc(P); }
static PJ *
setup(PJ *P) {
P->es = 0.; P->inv = s_inverse; P->fwd = s_forward;
return P;
}
ENTRY0(putp3) P->A = 4. * RPISQ; ENDENTRY(setup(P))
ENTRY0(putp3p) P->A = 2. * RPISQ; ENDENTRY(setup(P))
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