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#define PJ_LIB__
# include <projects.h>
PROJ_HEAD(wag2, "Wagner II") "\n\tPCyl., Sph.";
#define C_x 0.92483
#define C_y 1.38725
#define C_p1 0.88022
#define C_p2 0.88550
static XY s_forward (LP lp, PJ *P) { /* Spheroidal, forward */
XY xy = {0.0,0.0};
lp.phi = aasin (P->ctx,C_p1 * sin (C_p2 * lp.phi));
xy.x = C_x * lp.lam * cos (lp.phi);
xy.y = C_y * lp.phi;
return (xy);
}
static LP s_inverse (XY xy, PJ *P) { /* Spheroidal, inverse */
LP lp = {0.0,0.0};
lp.phi = xy.y / C_y;
lp.lam = xy.x / (C_x * cos(lp.phi));
lp.phi = aasin (P->ctx,sin(lp.phi) / C_p1) / C_p2;
return (lp);
}
static void *freeup_new (PJ *P) { /* Destructor */
return pj_dealloc(P);
}
static void freeup (PJ *P) {
freeup_new (P);
return;
}
PJ *PROJECTION(wag2) {
P->es = 0.;
P->inv = s_inverse;
P->fwd = s_forward;
return P;
}
#ifndef PJ_SELFTEST
int pj_wag2_selftest (void) {return 0;}
#else
int pj_wag2_selftest (void) {
double tolerance_lp = 1e-10;
double tolerance_xy = 1e-7;
char s_args[] = {"+proj=wag2 +a=6400000 +lat_1=0.5 +lat_2=2"};
LP fwd_in[] = {
{ 2, 1},
{ 2,-1},
{-2, 1},
{-2,-1}
};
XY s_fwd_expect[] = {
{ 206589.88809996162, 120778.04035754716},
{ 206589.88809996162, -120778.04035754716},
{-206589.88809996162, 120778.04035754716},
{-206589.88809996162, -120778.04035754716},
};
XY inv_in[] = {
{ 200, 100},
{ 200,-100},
{-200, 100},
{-200,-100}
};
LP s_inv_expect[] = {
{ 0.0019360240367390709, 0.00082795765763814082},
{ 0.0019360240367390709, -0.00082795765763814082},
{-0.0019360240367390709, 0.00082795765763814082},
{-0.0019360240367390709, -0.00082795765763814082},
};
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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