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#define PJ_LIB__
#include <projects.h>
PROJ_HEAD(fahey, "Fahey") "\n\tPcyl, Sph.";
#define TOL 1e-6
static XY s_forward (LP lp, PJ *P) { /* Spheroidal, forward */
XY xy = {0.0,0.0};
(void) P;
xy.x = tan(0.5 * lp.phi);
xy.y = 1.819152 * xy.x;
xy.x = 0.819152 * lp.lam * asqrt(1 - xy.x * xy.x);
return xy;
}
static LP s_inverse (XY xy, PJ *P) { /* Spheroidal, inverse */
LP lp = {0.0,0.0};
(void) P;
xy.y /= 1.819152;
lp.phi = 2. * atan(xy.y);
xy.y = 1. - xy.y * xy.y;
lp.lam = fabs(xy.y) < TOL ? 0. : xy.x / (0.819152 * sqrt(xy.y));
return lp;
}
static void *freeup_new (PJ *P) { /* Destructor */
if (0==P)
return 0;
return pj_dealloc(P);
}
static void freeup (PJ *P) {
freeup_new (P);
return;
}
PJ *PROJECTION(fahey) {
P->es = 0.;
P->inv = s_inverse;
P->fwd = s_forward;
return P;
}
#ifdef PJ_OMIT_SELFTEST
int pj_fahey_selftest (void) {return 0;}
#else
int pj_fahey_selftest (void) {
double tolerance_lp = 1e-10;
double tolerance_xy = 1e-7;
char s_args[] = {"+proj=fahey +a=6400000 +lat_1=0.5 +lat_2=2"};
LP fwd_in[] = {
{ 2, 1},
{ 2,-1},
{-2, 1},
{-2,-1}
};
XY s_fwd_expect[] = {
{ 182993.34464912376, 101603.19356988439},
{ 182993.34464912376, -101603.19356988439},
{-182993.34464912376, 101603.19356988439},
{-182993.34464912376, -101603.19356988439},
};
XY inv_in[] = {
{ 200, 100},
{ 200,-100},
{-200, 100},
{-200,-100}
};
LP s_inv_expect[] = {
{0.0021857886080359551, 0.00098424601668238403},
{0.0021857886080359551, -0.00098424601668238403},
{-0.0021857886080359551, 0.00098424601668238403},
{-0.0021857886080359551, -0.00098424601668238403},
};
return pj_generic_selftest (0, s_args, tolerance_xy, tolerance_lp, 4, 4, fwd_in, 0, s_fwd_expect, inv_in, 0, s_inv_expect);
}
#endif
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