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#define PJ_LIB__
#include <projects.h>
PROJ_HEAD(goode, "Goode Homolosine") "\n\tPCyl, Sph.";
#define Y_COR 0.05280
#define PHI_LIM 0.71093078197902358062
C_NAMESPACE PJ *pj_sinu(PJ *), *pj_moll(PJ *);
struct pj_opaque {
PJ *sinu;
PJ *moll;
};
static XY s_forward (LP lp, PJ *P) { /* Spheroidal, forward */
XY xy = {0.0,0.0};
struct pj_opaque *Q = P->opaque;
if (fabs(lp.phi) <= PHI_LIM)
xy = Q->sinu->fwd(lp, Q->sinu);
else {
xy = Q->moll->fwd(lp, Q->moll);
xy.y -= lp.phi >= 0.0 ? Y_COR : -Y_COR;
}
return xy;
}
static LP s_inverse (XY xy, PJ *P) { /* Spheroidal, inverse */
LP lp = {0.0,0.0};
struct pj_opaque *Q = P->opaque;
if (fabs(xy.y) <= PHI_LIM)
lp = Q->sinu->inv(xy, Q->sinu);
else {
xy.y += xy.y >= 0.0 ? Y_COR : -Y_COR;
lp = Q->moll->inv(xy, Q->moll);
}
return lp;
}
static void *freeup_new (PJ *P) { /* Destructor */
if (0==P)
return 0;
if (0==P->opaque)
return pj_dealloc(P);
if (P->opaque->sinu)
pj_dealloc(P->opaque->sinu);
if (P->opaque->moll)
pj_dealloc(P->opaque->moll);
pj_dealloc (P->opaque);
return pj_dealloc(P);
}
static void freeup (PJ *P) {
freeup_new (P);
return;
}
PJ *PROJECTION(goode) {
struct pj_opaque *Q = pj_calloc (1, sizeof (struct pj_opaque));
if (0==Q)
return freeup_new (P);
P->opaque = Q;
P->es = 0.;
if (!(Q->sinu = pj_sinu(0)) || !(Q->moll = pj_moll(0)))
E_ERROR_0;
Q->sinu->es = 0.;
Q->sinu->ctx = P->ctx;
Q->moll->ctx = P->ctx;
if (!(Q->sinu = pj_sinu(Q->sinu)) || !(Q->moll = pj_moll(Q->moll)))
E_ERROR_0;
P->fwd = s_forward;
P->inv = s_inverse;
return P;
}
#ifndef PJ_SELFTEST
int pj_goode_selftest (void) {return 0;}
#else
int pj_goode_selftest (void) {
double tolerance_lp = 1e-10;
double tolerance_xy = 1e-7;
char s_args[] = {"+proj=goode +a=6400000 +lat_1=0.5 +lat_2=2"};
LP fwd_in[] = {
{ 2, 1},
{ 2,-1},
{-2, 1},
{-2,-1}
};
XY s_fwd_expect[] = {
{ 223368.11902663155, 111701.07212763709},
{ 223368.11902663155, -111701.07212763709},
{-223368.11902663155, 111701.07212763709},
{-223368.11902663155, -111701.07212763709},
};
XY inv_in[] = {
{ 200, 100},
{ 200,-100},
{-200, 100},
{-200,-100}
};
LP s_inv_expect[] = {
{ 0.0017904931100023887, 0.00089524655489191132},
{ 0.0017904931100023887, -0.00089524655489191132},
{-0.0017904931100023887, 0.00089524655489191132},
{-0.0017904931100023887, -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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