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#define PJ_LIB__
#include <errno.h>
#include <math.h>
#include "proj.h"
#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;
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;
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 *destructor (PJ *P, int errlev) { /* Destructor */
if (0==P)
return 0;
if (0==P->opaque)
return pj_default_destructor (P, errlev);
pj_free (P->opaque->sinu);
pj_free (P->opaque->moll);
return pj_default_destructor (P, errlev);
}
PJ *PROJECTION(goode) {
struct pj_opaque *Q = pj_calloc (1, sizeof (struct pj_opaque));
if (0==Q)
return pj_default_destructor (P, ENOMEM);
P->opaque = Q;
P->destructor = destructor;
P->es = 0.;
if (!(Q->sinu = pj_sinu(0)) || !(Q->moll = pj_moll(0)))
return destructor (P, ENOMEM);
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)))
return destructor (P, ENOMEM);
P->fwd = s_forward;
P->inv = s_inverse;
return P;
}
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