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#define PJ_LIB__
#include <projects.h>
PROJ_HEAD(wink1, "Winkel I") "\n\tPCyl., Sph.\n\tlat_ts=";
struct pj_opaque {
double cosphi1;
};
static XY s_forward (LP lp, PJ *P) { /* Spheroidal, forward */
XY xy = {0.0,0.0};
xy.x = .5 * lp.lam * (P->opaque->cosphi1 + cos(lp.phi));
xy.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;
lp.lam = 2. * xy.x / (P->opaque->cosphi1 + cos(lp.phi));
return (lp);
}
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(wink1) {
struct pj_opaque *Q = pj_calloc (1, sizeof (struct pj_opaque));
if (0==Q)
return freeup_new (P);
P->opaque = Q;
P->opaque->cosphi1 = cos (pj_param(P->ctx, P->params, "rlat_ts").f);
P->es = 0.;
P->inv = s_inverse;
P->fwd = s_forward;
return P;
}
#ifndef PJ_SELFTEST
int pj_wink1_selftest (void) {return 0;}
#else
int pj_wink1_selftest (void) {
double tolerance_lp = 1e-10;
double tolerance_xy = 1e-7;
char s_args[] = {"+proj=wink1 +a=6400000 +lat_1=0.5 +lat_2=2"};
LP fwd_in[] = {
{ 2, 1},
{ 2,-1},
{-2, 1},
{-2,-1}
};
XY s_fwd_expect[] = {
{ 223385.13164095284, 111701.07212763709},
{ 223385.13164095284, -111701.07212763709},
{-223385.13164095284, 111701.07212763709},
{-223385.13164095284, -111701.07212763709},
};
XY inv_in[] = {
{ 200, 100},
{ 200,-100},
{-200, 100},
{-200,-100}
};
LP s_inv_expect[] = {
{ 0.0017904931098931057, 0.00089524655489191132},
{ 0.0017904931098931057, -0.00089524655489191132},
{-0.0017904931098931057, 0.00089524655489191132},
{-0.0017904931098931057, -0.00089524655489191132},
};
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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