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#define PJ_LIB__
#include <projects.h>
PROJ_HEAD(wag7, "Wagner VII") "\n\tMisc Sph, no inv.";
static XY s_forward (LP lp, PJ *P) { /* Spheroidal, forward */
XY xy = {0.0, 0.0};
double theta, ct, D;
(void) P; /* Shut up compiler warnnings about unused P */
theta = asin (xy.y = 0.90630778703664996 * sin(lp.phi));
xy.x = 2.66723 * (ct = cos (theta)) * sin (lp.lam /= 3.);
xy.y *= 1.24104 * (D = 1/(sqrt (0.5 * (1 + ct * cos (lp.lam)))));
xy.x *= D;
return (xy);
}
static void *freeup_new (PJ *P) { /* Destructor */
return pj_dealloc(P);
}
static void freeup (PJ *P) {
freeup_new (P);
return;
}
PJ *PROJECTION(wag7) {
P->fwd = s_forward;
P->inv = 0;
P->es = 0.;
return P;
}
#ifndef PJ_SELFTEST
int pj_wag7_selftest (void) {return 0;}
#else
int pj_wag7_selftest (void) {
double tolerance_lp = 1e-10;
double tolerance_xy = 1e-7;
char s_args[] = {"+proj=wag7 +a=6400000 +lat_1=0.5 +lat_2=2"};
LP fwd_in[] = {
{ 2, 1},
{ 2,-1},
{-2, 1},
{-2,-1}
};
XY s_fwd_expect[] = {
{ 198601.87695731167, 125637.0457141714},
{ 198601.87695731167, -125637.0457141714},
{-198601.87695731167, 125637.0457141714},
{-198601.87695731167, -125637.0457141714},
};
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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