EVOLUTION-MANAGER

Edit File: PJ_wag3.c

#define PJ_LIB__ #include <errno.h> #include <math.h> #include "projects.h" PROJ_HEAD(wag3, "Wagner III") "\n\tPCyl., Sph.\n\tlat_ts="; #define TWOTHIRD 0.6666666666666666666667 struct pj_opaque { double C_x; }; static XY s_forward (LP lp, PJ *P) { /* Spheroidal, forward */ XY xy = {0.0,0.0}; xy.x = P->opaque->C_x * lp.lam * cos(TWOTHIRD * lp.phi); xy.y = lp.phi; return xy; } static LP s_inverse (XY xy, PJ *P) { /* Spheroidal, inverse */ LP lp = {0.0,0.0}; lp.phi = xy.y; lp.lam = xy.x / (P->opaque->C_x * cos(TWOTHIRD * lp.phi)); return lp; } PJ *PROJECTION(wag3) { double ts; struct pj_opaque *Q = pj_calloc (1, sizeof (struct pj_opaque)); if (0==Q) return pj_default_destructor(P, ENOMEM); P->opaque = Q; ts = pj_param (P->ctx, P->params, "rlat_ts").f; P->opaque->C_x = cos (ts) / cos (2.*ts/3.); P->es = 0.; P->inv = s_inverse; P->fwd = s_forward; return P; }