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/******************************************************************************
* Copyright (c) 2017, Lukasz Komsta
*
* 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 "projects.h"
#include "proj_math.h"
#define EPS10 1e-10
struct pj_opaque {
double phi1;
double ctgphi1;
double sinphi1;
double cosphi1;
double *en;
};
PROJ_HEAD(ccon, "Central Conic")
"\n\tCentral Conic, Sph\n\tlat_1=";
static XY forward (LP lp, PJ *P) {
XY xy = {0.0,0.0};
struct pj_opaque *Q = P->opaque;
double r;
r = Q->ctgphi1 - tan(lp.phi - Q->phi1);
xy.x = r * sin(lp.lam * Q->sinphi1);
xy.y = Q->ctgphi1 - r * cos(lp.lam * Q->sinphi1);
return xy;
}
static LP inverse (XY xy, PJ *P) {
LP lp = {0.0,0.0};
struct pj_opaque *Q = P->opaque;
xy.y = Q->ctgphi1 - xy.y;
lp.phi = Q->phi1 - atan(hypot(xy.x,xy.y) - Q->ctgphi1);
lp.lam = atan2(xy.x,xy.y)/Q->sinphi1;
return lp;
}
static void *destructor (PJ *P, int errlev) {
if (0==P)
return 0;
if (0==P->opaque)
return pj_default_destructor (P, errlev);
pj_dealloc (P->opaque->en);
return pj_default_destructor (P, errlev);
}
PJ *PROJECTION(ccon) {
struct pj_opaque *Q = pj_calloc (1, sizeof (struct pj_opaque));
if (0==Q)
return pj_default_destructor (P, ENOMEM);
P->opaque = Q;
P->destructor = destructor;
Q->phi1 = pj_param(P->ctx, P->params, "rlat_1").f;
if (fabs(Q->phi1) < EPS10)
return destructor (P, PJD_ERR_LAT1_IS_ZERO);
if (!(Q->en = pj_enfn(P->es)))
return destructor(P, ENOMEM);
Q->sinphi1 = sin(Q->phi1);
Q->cosphi1 = cos(Q->phi1);
Q->ctgphi1 = Q->cosphi1/Q->sinphi1;
P->inv = inverse;
P->fwd = forward;
return P;
}
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