blob: 93e9b38db373150a07e8f6e06991556c018448ec (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
|
#define PJ_LIB__
# include <projects.h>
PROJ_HEAD(fahey, "Fahey") "\n\tPcyl, Sph.";
#define TOL 1e-6
FORWARD(s_forward); /* spheroid */
xy.y = 1.819152 * ( xy.x = tan(0.5 * lp.phi) );
xy.x = 0.819152 * lp.lam * asqrt(1 - xy.x * xy.x);
return (xy);
}
INVERSE(s_inverse); /* spheroid */
lp.phi = 2. * atan(xy.y /= 1.819152);
lp.lam = fabs(xy.y = 1. - xy.y * xy.y) < TOL ? 0. :
xy.x / (0.819152 * sqrt(xy.y));
return (lp);
}
FREEUP; if (P) pj_dalloc(P); }
ENTRY0(fahey) P->es = 0.; P->inv = s_inverse; P->fwd = s_forward; ENDENTRY(P)
|
