EVOLUTION-MANAGER

Edit File: PJ_collg.c

#define PJ_LIB__ # include <projects.h> PROJ_HEAD(collg, "Collignon") "\n\tPCyl, Sph."; #define FXC 1.12837916709551257390 #define FYC 1.77245385090551602729 #define ONEEPS 1.0000001 FORWARD(s_forward); /* spheroid */ if ((xy.y = 1. - sin(lp.phi)) <= 0.) xy.y = 0.; else xy.y = sqrt(xy.y); xy.x = FXC * lp.lam * xy.y; xy.y = FYC * (1. - xy.y); return (xy); } INVERSE(s_inverse); /* spheroid */ lp.phi = xy.y / FYC - 1.; if (fabs(lp.phi = 1. - lp.phi * lp.phi) < 1.) lp.phi = asin(lp.phi); else if (fabs(lp.phi) > ONEEPS) I_ERROR else lp.phi = lp.phi < 0. ? -HALFPI : HALFPI; if ((lp.lam = 1. - sin(lp.phi)) <= 0.) lp.lam = 0.; else lp.lam = xy.x / (FXC * sqrt(lp.lam)); return (lp); } FREEUP; if (P) pj_dalloc(P); } ENTRY0(collg) P->es = 0.; P->inv = s_inverse; P->fwd = s_forward; ENDENTRY(P)