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#define PJ_LIB__
#include <errno.h>
#include "projects.h"
struct pj_opaque {
double C_x, C_y;
};
PROJ_HEAD(putp4p, "Putnins P4'") "\n\tPCyl., Sph.";
PROJ_HEAD(weren, "Werenskiold I") "\n\tPCyl., Sph.";
static XY s_forward (LP lp, PJ *P) { /* Spheroidal, forward */
XY xy = {0.0,0.0};
struct pj_opaque *Q = P->opaque;
lp.phi = aasin(P->ctx,0.883883476 * sin(lp.phi));
xy.x = Q->C_x * lp.lam * cos(lp.phi);
xy.x /= cos(lp.phi *= 0.333333333333333);
xy.y = Q->C_y * sin(lp.phi);
return xy;
}
static LP s_inverse (XY xy, PJ *P) { /* Spheroidal, inverse */
LP lp = {0.0,0.0};
struct pj_opaque *Q = P->opaque;
lp.phi = aasin(P->ctx,xy.y / Q->C_y);
lp.lam = xy.x * cos(lp.phi) / Q->C_x;
lp.phi *= 3.;
lp.lam /= cos(lp.phi);
lp.phi = aasin(P->ctx,1.13137085 * sin(lp.phi));
return lp;
}
PJ *PROJECTION(putp4p) {
struct pj_opaque *Q = pj_calloc (1, sizeof (struct pj_opaque));
if (0==Q)
return pj_default_destructor (P, ENOMEM);
P->opaque = Q;
Q->C_x = 0.874038744;
Q->C_y = 3.883251825;
P->es = 0.;
P->inv = s_inverse;
P->fwd = s_forward;
return P;
}
PJ *PROJECTION(weren) {
struct pj_opaque *Q = pj_calloc (1, sizeof (struct pj_opaque));
if (0==Q)
return pj_default_destructor (P, ENOMEM);
P->opaque = Q;
Q->C_x = 1.;
Q->C_y = 4.442882938;
P->es = 0.;
P->inv = s_inverse;
P->fwd = s_forward;
return P;
}
int pj_putp4p_selftest (void) {return 10000;}
int pj_weren_selftest (void) {return 10000;}
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