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#define PJ_LIB__
#include <errno.h>
#include <math.h>
#include "proj.h"
#include "proj_internal.h"
PROJ_HEAD(eck3, "Eckert III") "\n\tPCyl, Sph";
PROJ_HEAD(putp1, "Putnins P1") "\n\tPCyl, Sph";
PROJ_HEAD(wag6, "Wagner VI") "\n\tPCyl, Sph";
PROJ_HEAD(kav7, "Kavraisky VII") "\n\tPCyl, Sph";
namespace { // anonymous namespace
struct pj_opaque {
double C_x, C_y, A, B;
};
} // anonymous namespace
static PJ_XY eck3_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.y = Q->C_y * lp.phi;
xy.x = Q->C_x * lp.lam * (Q->A + asqrt(1. - Q->B * lp.phi * lp.phi));
return xy;
}
static PJ_LP eck3_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);
double denominator;
lp.phi = xy.y / Q->C_y;
denominator = (Q->C_x * (Q->A + asqrt(1. - Q->B * lp.phi * lp.phi)));
if ( denominator == 0.0)
lp.lam = HUGE_VAL;
else
lp.lam = xy.x / denominator;
return lp;
}
static PJ *setup(PJ *P) {
P->es = 0.;
P->inv = eck3_s_inverse;
P->fwd = eck3_s_forward;
return P;
}
PJ *PROJECTION(eck3) {
struct pj_opaque *Q = static_cast<struct pj_opaque*>(pj_calloc (1, sizeof (struct pj_opaque)));
if (nullptr==Q)
return pj_default_destructor (P, ENOMEM);
P->opaque = Q;
Q->C_x = 0.42223820031577120149;
Q->C_y = 0.84447640063154240298;
Q->A = 1.0;
Q->B = 0.4052847345693510857755;
return setup(P);
}
PJ *PROJECTION(kav7) {
struct pj_opaque *Q = static_cast<struct pj_opaque*>(pj_calloc (1, sizeof (struct pj_opaque)));
if (nullptr==Q)
return pj_default_destructor (P, ENOMEM);
P->opaque = Q;
/* Defined twice in original code - Using 0.866...,
* but leaving the other one here as a safety measure.
* Q->C_x = 0.2632401569273184856851; */
Q->C_x = 0.8660254037844;
Q->C_y = 1.;
Q->A = 0.;
Q->B = 0.30396355092701331433;
return setup(P);
}
PJ *PROJECTION(wag6) {
struct pj_opaque *Q = static_cast<struct pj_opaque*>(pj_calloc (1, sizeof (struct pj_opaque)));
if (nullptr==Q)
return pj_default_destructor (P, ENOMEM);
P->opaque = Q;
Q->C_x = Q->C_y = 0.94745;
Q->A = 0.0;
Q->B = 0.30396355092701331433;
return setup(P);
}
PJ *PROJECTION(putp1) {
struct pj_opaque *Q = static_cast<struct pj_opaque*>(pj_calloc (1, sizeof (struct pj_opaque)));
if (nullptr==Q)
return pj_default_destructor (P, ENOMEM);
P->opaque = Q;
Q->C_x = 1.89490;
Q->C_y = 0.94745;
Q->A = -0.5;
Q->B = 0.30396355092701331433;
return setup(P);
}
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