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/*
** libproj -- library of cartographic projections
**
** Copyright (c) 2003 Gerald I. Evenden
*/
/*
** Permission is hereby granted, free of charge, to any person obtaining
** a copy of this software and associated documentation files (the
** "Software"), to deal in the Software without restriction, including
** without limitation the rights to use, copy, modify, merge, publish,
** distribute, sublicense, and/or sell copies of the Software, and to
** permit persons to whom the Software is furnished to do so, subject to
** the following conditions:
**
** The above copyright notice and this permission notice shall be
** included in all copies or substantial portions of the Software.
**
** THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
** EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
** MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
** IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
** CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
** TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
** SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*/
#define PJ_LIB__
#include <errno.h>
#include "proj.h"
#include "proj_internal.h"
#include <math.h>
namespace { // anonymous namespace
struct pj_opaque {
double phic0;
double cosc0, sinc0;
double R2;
void *en;
};
} // anonymous namespace
PROJ_HEAD(sterea, "Oblique Stereographic Alternative") "\n\tAzimuthal, Sph&Ell";
static PJ_XY sterea_e_forward (PJ_LP lp, PJ *P) { /* Ellipsoidal, forward */
PJ_XY xy = {0.0,0.0};
struct pj_opaque *Q = static_cast<struct pj_opaque*>(P->opaque);
double cosc, sinc, cosl, k;
lp = pj_gauss(P->ctx, lp, Q->en);
sinc = sin(lp.phi);
cosc = cos(lp.phi);
cosl = cos(lp.lam);
const double denom = 1. + Q->sinc0 * sinc + Q->cosc0 * cosc * cosl;
if( denom == 0.0 ) {
proj_errno_set(P, PROJ_ERR_COORD_TRANSFM_OUTSIDE_PROJECTION_DOMAIN);
return proj_coord_error().xy;
}
k = P->k0 * Q->R2 / denom;
xy.x = k * cosc * sin(lp.lam);
xy.y = k * (Q->cosc0 * sinc - Q->sinc0 * cosc * cosl);
return xy;
}
static PJ_LP sterea_e_inverse (PJ_XY xy, PJ *P) { /* Ellipsoidal, inverse */
PJ_LP lp = {0.0,0.0};
struct pj_opaque *Q = static_cast<struct pj_opaque*>(P->opaque);
double rho, c, sinc, cosc;
xy.x /= P->k0;
xy.y /= P->k0;
if ( (rho = hypot (xy.x, xy.y)) != 0.0 ) {
c = 2. * atan2 (rho, Q->R2);
sinc = sin (c);
cosc = cos (c);
lp.phi = asin (cosc * Q->sinc0 + xy.y * sinc * Q->cosc0 / rho);
lp.lam = atan2 (xy.x * sinc, rho * Q->cosc0 * cosc - xy.y * Q->sinc0 * sinc);
} else {
lp.phi = Q->phic0;
lp.lam = 0.;
}
return pj_inv_gauss(P->ctx, lp, Q->en);
}
static PJ *destructor (PJ *P, int errlev) {
if (nullptr==P)
return nullptr;
if (nullptr==P->opaque)
return pj_default_destructor (P, errlev);
free (static_cast<struct pj_opaque*>(P->opaque)->en);
return pj_default_destructor (P, errlev);
}
PJ *PROJECTION(sterea) {
double R;
struct pj_opaque *Q = static_cast<struct pj_opaque*>(calloc (1, sizeof (struct pj_opaque)));
if (nullptr==Q)
return pj_default_destructor (P, PROJ_ERR_INVALID_OP /*ENOMEM*/);
P->opaque = Q;
Q->en = pj_gauss_ini(P->e, P->phi0, &(Q->phic0), &R);
if (nullptr==Q->en)
return pj_default_destructor (P, PROJ_ERR_INVALID_OP /*ENOMEM*/);
Q->sinc0 = sin (Q->phic0);
Q->cosc0 = cos (Q->phic0);
Q->R2 = 2. * R;
P->inv = sterea_e_inverse;
P->fwd = sterea_e_forward;
P->destructor = destructor;
return P;
}
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