/Proj4/PJ_putp3.c

 1#ifndef lint
 2static const char SCCSID[]="@(#)PJ_putp3.c	4.1	94/02/15	GIE	REL";
 3#endif
 4#define PROJ_PARMS__ \
 5	double	A;
 6#define PJ_LIB__
 7# include	"projects.h"
 8PROJ_HEAD(putp3, "Putnins P3") "\n\tPCyl., Sph.";
 9PROJ_HEAD(putp3p, "Putnins P3'") "\n\tPCyl., no inv., Sph.";
10#define C	0.79788456
11#define RPISQ	0.1013211836
12FORWARD(s_forward); /* spheroid */
13	xy.x = C * lp.lam * (1. - P->A * lp.phi * lp.phi);
14	xy.y = C * lp.phi;
15	return (xy);
16}
17INVERSE(s_inverse); /* spheroid */
18	lp.phi = xy.y / C;
19	lp.lam = xy.x / (C * (1. - P->A * lp.phi * lp.phi));
20	return (lp);
21}
22FREEUP; if (P) pj_dalloc(P); }
23	static PJ *
24setup(PJ *P) {
25	P->es = 0.; P->inv = s_inverse; P->fwd = s_forward;
26	return P;
27}
28ENTRY0(putp3)  P->A = 4. * RPISQ; ENDENTRY(setup(P))
29ENTRY0(putp3p) P->A = 2. * RPISQ; ENDENTRY(setup(P))