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#define PJ_LIB__
#include <proj.h>
#include "projects.h"
PROJ_HEAD(tcc, "Transverse Central Cylindrical") "\n\tCyl, Sph, no inv.";
#define EPS10 1.e-10
static XY s_forward (LP lp, PJ *P) { /* Spheroidal, forward */
XY xy = {0.0, 0.0};
double b, bt;
b = cos (lp.phi) * sin (lp.lam);
if ((bt = 1. - b * b) < EPS10) {
proj_errno_set(P, PJD_ERR_TOLERANCE_CONDITION);
return xy;
}
xy.x = b / sqrt(bt);
xy.y = atan2 (tan (lp.phi) , cos (lp.lam));
return xy;
}
PJ *PROJECTION(tcc) {
P->es = 0.;
P->fwd = s_forward;
P->inv = 0;
return P;
}
#ifndef PJ_SELFTEST
int pj_tcc_selftest (void) {return 0;}
#else
int pj_tcc_selftest (void) {
double tolerance_lp = 1e-10;
double tolerance_xy = 1e-7;
char s_args[] = {"+proj=tcc +a=6400000 +lat_1=0.5 +lat_2=2 +n=0.5"};
LP fwd_in[] = {
{ 2, 1},
{ 2,-1},
{-2, 1},
{-2,-1}
};
XY s_fwd_expect[] = {
{223458.84419245756, 111769.14504058579},
{223458.84419245756, -111769.14504058579},
{-223458.84419245756, 111769.14504058579},
{-223458.84419245756, -111769.14504058579},
};
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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