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# define HLFPI2 2.46740110027233965467
# define EPS 1e-10
#define PROJ_PARMS__ \
int bacn; \
int ortl;
#define PJ_LIB__
#include <projects.h>
PROJ_HEAD(apian, "Apian Globular I") "\n\tMisc Sph, no inv.";
PROJ_HEAD(ortel, "Ortelius Oval") "\n\tMisc Sph, no inv.";
PROJ_HEAD(bacon, "Bacon Globular") "\n\tMisc Sph, no inv.";
FORWARD(s_forward); /* spheroid */
double ax, f;
xy.y = P->bacn ? HALFPI * sin(lp.phi) : lp.phi;
if ((ax = fabs(lp.lam)) >= EPS) {
if (P->ortl && ax >= HALFPI)
xy.x = sqrt(HLFPI2 - lp.phi * lp.phi + EPS) + ax - HALFPI;
else {
f = 0.5 * (HLFPI2 / ax + ax);
xy.x = ax - f + sqrt(f * f - xy.y * xy.y);
}
if (lp.lam < 0.) xy.x = - xy.x;
} else
xy.x = 0.;
return (xy);
}
FREEUP; if (P) pj_dalloc(P); }
ENTRY0(bacon)
P->bacn = 1;
P->ortl = 0;
P->es = 0.; P->fwd = s_forward;
ENDENTRY(P)
ENTRY0(apian)
P->bacn = P->ortl = 0;
P->es = 0.; P->fwd = s_forward;
ENDENTRY(P)
ENTRY0(ortel)
P->bacn = 0;
P->ortl = 1;
P->es = 0.; P->fwd = s_forward;
ENDENTRY(P)
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