From 610957f7035242f15743c399ffd429b92bc36206 Mon Sep 17 00:00:00 2001 From: Even Rouault Date: Tue, 18 Dec 2018 20:24:11 +0100 Subject: cpp conversion: minimal steps to fix compilation errors, not warnings --- src/PJ_fahey.cpp | 41 +++++++++++++++++++++++++++++++++++++++++ 1 file changed, 41 insertions(+) create mode 100644 src/PJ_fahey.cpp (limited to 'src/PJ_fahey.cpp') diff --git a/src/PJ_fahey.cpp b/src/PJ_fahey.cpp new file mode 100644 index 00000000..85e0ab69 --- /dev/null +++ b/src/PJ_fahey.cpp @@ -0,0 +1,41 @@ +#define PJ_LIB__ + +#include + +#include "projects.h" + +PROJ_HEAD(fahey, "Fahey") "\n\tPcyl, Sph"; + +#define TOL 1e-6 + + +static XY s_forward (LP lp, PJ *P) { /* Spheroidal, forward */ + XY xy = {0.0,0.0}; + (void) P; + + xy.x = tan(0.5 * lp.phi); + xy.y = 1.819152 * xy.x; + xy.x = 0.819152 * lp.lam * asqrt(1 - xy.x * xy.x); + return xy; +} + + +static LP s_inverse (XY xy, PJ *P) { /* Spheroidal, inverse */ + LP lp = {0.0,0.0}; + (void) P; + + xy.y /= 1.819152; + lp.phi = 2. * atan(xy.y); + xy.y = 1. - xy.y * xy.y; + lp.lam = fabs(xy.y) < TOL ? 0. : xy.x / (0.819152 * sqrt(xy.y)); + return lp; +} + + +PJ *PROJECTION(fahey) { + P->es = 0.; + P->inv = s_inverse; + P->fwd = s_forward; + + return P; +} -- cgit v1.2.3