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#define PROJ_PARMS__ \
double phi1; \
double fxa; \
double fxb; \
int mode;
#define EPS 1e-9
#define PJ_LIB__
#include <projects.h>
PROJ_HEAD(rpoly, "Rectangular Polyconic")
"\n\tConic, Sph., no inv.\n\tlat_ts=";
FORWARD(s_forward); /* spheroid */
double fa;
if (P->mode)
fa = tan(lp.lam * P->fxb) * P->fxa;
else
fa = 0.5 * lp.lam;
if (fabs(lp.phi) < EPS) {
xy.x = fa + fa;
xy.y = - P->phi0;
} else {
xy.y = 1. / tan(lp.phi);
xy.x = sin(fa = 2. * atan(fa * sin(lp.phi))) * xy.y;
xy.y = lp.phi - P->phi0 + (1. - cos(fa)) * xy.y;
}
return (xy);
}
FREEUP; if (P) pj_dalloc(P); }
ENTRY0(rpoly)
if ((P->mode = (P->phi1 = fabs(pj_param(P->params, "rlat_ts").f)) > EPS)) {
P->fxb = 0.5 * sin(P->phi1);
P->fxa = 0.5 / P->fxb;
}
P->es = 0.; P->fwd = s_forward;
ENDENTRY(P)
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