EVOLUTION-MANAGER

Edit File: PJ_fouc_s.c

#define PROJ_PARMS__ \ double n, n1; #define PJ_LIB__ #include <projects.h> PROJ_HEAD(fouc_s, "Foucaut Sinusoidal") "\n\tPCyl., Sph."; #define MAX_ITER 10 #define LOOP_TOL 1e-7 FORWARD(s_forward); /* spheroid */ double t; t = cos(lp.phi); xy.x = lp.lam * t / (P->n + P->n1 * t); xy.y = P->n * lp.phi + P->n1 * sin(lp.phi); return (xy); } INVERSE(s_inverse); /* spheroid */ double V; int i; if (P->n) { lp.phi = xy.y; for (i = MAX_ITER; i ; --i) { lp.phi -= V = (P->n * lp.phi + P->n1 * sin(lp.phi) - xy.y ) / (P->n + P->n1 * cos(lp.phi)); if (fabs(V) < LOOP_TOL) break; } if (!i) lp.phi = xy.y < 0. ? -HALFPI : HALFPI; } else lp.phi = aasin(P->ctx,xy.y); V = cos(lp.phi); lp.lam = xy.x * (P->n + P->n1 * V) / V; return (lp); } FREEUP; if (P) pj_dalloc(P); } ENTRY0(fouc_s) P->n = pj_param(P->ctx, P->params, "dn").f; if (P->n < 0. || P->n > 1.) E_ERROR(-99) P->n1 = 1. - P->n; P->es = 0; P->inv = s_inverse; P->fwd = s_forward; ENDENTRY(P)