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#define PJ_LIB__
#include <projects.h>
struct pj_opaque {
double phi1;
double fxa;
double fxb;
int mode;
};
PROJ_HEAD(rpoly, "Rectangular Polyconic")
"\n\tConic, Sph., no inv.\n\tlat_ts=";
#define EPS 1e-9
static XY s_forward (LP lp, PJ *P) { /* Spheroidal, forward */
XY xy = {0.0,0.0};
struct pj_opaque *Q = P->opaque;
double fa;
if (Q->mode)
fa = tan(lp.lam * Q->fxb) * Q->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;
}
static void *freeup_new (PJ *P) { /* Destructor */
if (0==P)
return 0;
if (0==P->opaque)
return pj_dealloc (P);
pj_dealloc (P->opaque);
return pj_dealloc(P);
}
static void freeup (PJ *P) {
freeup_new (P);
return;
}
PJ *PROJECTION(rpoly) {
struct pj_opaque *Q = pj_calloc (1, sizeof (struct pj_opaque));
if (0==Q)
return freeup_new (P);
P->opaque = Q;
if ((Q->mode = (Q->phi1 = fabs(pj_param(P->ctx, P->params, "rlat_ts").f)) > EPS)) {
Q->fxb = 0.5 * sin(Q->phi1);
Q->fxa = 0.5 / Q->fxb;
}
P->es = 0.;
P->fwd = s_forward;
return P;
}
#ifndef PJ_SELFTEST
int pj_rpoly_selftest (void) {return 0;}
#else
int pj_rpoly_selftest (void) {
double tolerance_lp = 1e-10;
double tolerance_xy = 1e-7;
char s_args[] = {"+proj=rpoly +a=6400000 +lat_1=0.5 +lat_2=2"};
LP fwd_in[] = {
{ 2, 1},
{ 2,-1},
{-2, 1},
{-2,-1}
};
XY s_fwd_expect[] = {
{ 223368.09830201423, 111769.110486991223},
{ 223368.09830201423, -111769.110486991223},
{-223368.09830201423, 111769.110486991223},
{-223368.09830201423, -111769.110486991223},
};
return pj_generic_selftest (0, s_args, tolerance_xy, tolerance_lp, 4, 4, fwd_in, 0, s_fwd_expect, 0, 0, 0);
}
#endif
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