EVOLUTION-MANAGER

Edit File: PJ_crast.c

#define PJ_LIB__ #include <math.h> #include "projects.h" PROJ_HEAD(crast, "Craster Parabolic (Putnins P4)") "\n\tPCyl., Sph."; #define XM 0.97720502380583984317 #define RXM 1.02332670794648848847 #define YM 3.06998012383946546542 #define RYM 0.32573500793527994772 #define THIRD 0.333333333333333333 static XY s_forward (LP lp, PJ *P) { /* Spheroidal, forward */ XY xy = {0.0,0.0}; (void) P; lp.phi *= THIRD; xy.x = XM * lp.lam * (2. * cos(lp.phi + lp.phi) - 1.); xy.y = YM * sin(lp.phi); return xy; } static LP s_inverse (XY xy, PJ *P) { /* Spheroidal, inverse */ LP lp = {0.0,0.0}; (void) P; lp.phi = 3. * asin(xy.y * RYM); lp.lam = xy.x * RXM / (2. * cos((lp.phi + lp.phi) * THIRD) - 1); return lp; } PJ *PROJECTION(crast) { P->es = 0.0; P->inv = s_inverse; P->fwd = s_forward; return P; }