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#define PJ_LIB__
#include <projects.h>
PROJ_HEAD(gall, "Gall (Gall Stereographic)") "\n\tCyl, Sph";
#define YF 1.70710678118654752440
#define XF 0.70710678118654752440
#define RYF 0.58578643762690495119
#define RXF 1.41421356237309504880
static XY s_forward (LP lp, PJ *P) { /* Spheroidal, forward */
XY xy = {0.0,0.0};
(void) P;
xy.x = XF * lp.lam;
xy.y = YF * tan(.5 * lp.phi);
return xy;
}
static LP s_inverse (XY xy, PJ *P) { /* Spheroidal, inverse */
LP lp = {0.0,0.0};
(void) P;
lp.lam = RXF * xy.x;
lp.phi = 2. * atan(xy.y * RYF);
return lp;
}
static void *freeup_new (PJ *P) { /* Destructor */
if (0==P)
return 0;
return pj_dealloc(P);
}
static void freeup (PJ *P) {
freeup_new (P);
return;
}
PJ *PROJECTION(gall) {
P->es = 0.0;
P->inv = s_inverse;
P->fwd = s_forward;
return P;
}
#ifndef PJ_SELFTEST
int pj_gall_selftest (void) {return 0;}
#else
int pj_gall_selftest (void) {
double tolerance_lp = 1e-10;
double tolerance_xy = 1e-7;
char s_args[] = {"+proj=gall +a=6400000 +lat_1=0.5 +lat_2=2"};
LP fwd_in[] = {
{ 2, 1},
{ 2,-1},
{-2, 1},
{-2,-1}
};
XY s_fwd_expect[] = {
{ 157969.17113451968, 95345.249178385886},
{ 157969.17113451968, -95345.249178385886},
{-157969.17113451968, 95345.249178385886},
{-157969.17113451968, -95345.249178385886},
};
XY inv_in[] = {
{ 200, 100},
{ 200,-100},
{-200, 100},
{-200,-100}
};
LP s_inv_expect[] = {
{ 0.0025321396391918614, 0.001048846580346495},
{ 0.0025321396391918614, -0.001048846580346495},
{-0.0025321396391918614, 0.001048846580346495},
{-0.0025321396391918614, -0.001048846580346495},
};
return pj_generic_selftest (0, s_args, tolerance_xy, tolerance_lp, 4, 4, fwd_in, 0, s_fwd_expect, inv_in, 0, s_inv_expect);
}
#endif
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