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#define PJ_LIB__
#include <errno.h>
#include <math.h>
#include "proj.h"
#include "proj_internal.h"
PROJ_HEAD(kav5, "Kavraisky V") "\n\tPCyl, Sph";
PROJ_HEAD(qua_aut, "Quartic Authalic") "\n\tPCyl, Sph";
PROJ_HEAD(fouc, "Foucaut") "\n\tPCyl, Sph";
PROJ_HEAD(mbt_s, "McBryde-Thomas Flat-Polar Sine (No. 1)") "\n\tPCyl, Sph";
namespace { // anonymous namespace
struct pj_opaque {
double C_x, C_y, C_p;
int tan_mode;
};
} // anonymous namespace
static PJ_XY sts_s_forward (PJ_LP lp, PJ *P) { /* Spheroidal, forward */
PJ_XY xy = {0.0,0.0};
struct pj_opaque *Q = static_cast<struct pj_opaque*>(P->opaque);
xy.x = Q->C_x * lp.lam * cos(lp.phi);
xy.y = Q->C_y;
lp.phi *= Q->C_p;
const double c = cos(lp.phi);
if (Q->tan_mode) {
xy.x *= c * c;
xy.y *= tan (lp.phi);
} else {
xy.x /= c;
xy.y *= sin (lp.phi);
}
return xy;
}
static PJ_LP sts_s_inverse (PJ_XY xy, PJ *P) { /* Spheroidal, inverse */
PJ_LP lp = {0.0,0.0};
struct pj_opaque *Q = static_cast<struct pj_opaque*>(P->opaque);
xy.y /= Q->C_y;
lp.phi = Q->tan_mode ? atan (xy.y) : aasin (P->ctx, xy.y);
const double c = cos (lp.phi);
lp.phi /= Q->C_p;
lp.lam = xy.x / (Q->C_x * cos(lp.phi));
if (Q->tan_mode)
lp.lam /= c * c;
else
lp.lam *= c;
return lp;
}
static PJ *setup(PJ *P, double p, double q, int mode) {
P->es = 0.;
P->inv = sts_s_inverse;
P->fwd = sts_s_forward;
static_cast<struct pj_opaque*>(P->opaque)->C_x = q / p;
static_cast<struct pj_opaque*>(P->opaque)->C_y = p;
static_cast<struct pj_opaque*>(P->opaque)->C_p = 1/ q;
static_cast<struct pj_opaque*>(P->opaque)->tan_mode = mode;
return P;
}
PJ *PROJECTION(fouc) {
struct pj_opaque *Q = static_cast<struct pj_opaque*>(calloc (1, sizeof (struct pj_opaque)));
if (nullptr==Q)
return pj_default_destructor(P, PROJ_ERR_INVALID_OP /*ENOMEM*/);
P->opaque = Q;
return setup(P, 2., 2., 1);
}
PJ *PROJECTION(kav5) {
struct pj_opaque *Q = static_cast<struct pj_opaque*>(calloc (1, sizeof (struct pj_opaque)));
if (nullptr==Q)
return pj_default_destructor(P, PROJ_ERR_INVALID_OP /*ENOMEM*/);
P->opaque = Q;
return setup(P, 1.50488, 1.35439, 0);
}
PJ *PROJECTION(qua_aut) {
struct pj_opaque *Q = static_cast<struct pj_opaque*>(calloc (1, sizeof (struct pj_opaque)));
if (nullptr==Q)
return pj_default_destructor(P, PROJ_ERR_INVALID_OP /*ENOMEM*/);
P->opaque = Q;
return setup(P, 2., 2., 0);
}
PJ *PROJECTION(mbt_s) {
struct pj_opaque *Q = static_cast<struct pj_opaque*>(calloc (1, sizeof (struct pj_opaque)));
if (nullptr==Q)
return pj_default_destructor(P, PROJ_ERR_INVALID_OP /*ENOMEM*/);
P->opaque = Q;
return setup(P, 1.48875, 1.36509, 0);
}
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