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/*
** libproj -- library of cartographic projections
**
** Copyright (c) 2003, 2005, 2006 Gerald I. Evenden
*/
static const char
LIBPROJ_ID[] = "Id";
/*
** 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 PROJ_PARMS__ \
struct PROJconsts *link; \
void *en; \
double costh, sinth; \
int rot;
#define PROJ_LIB__
#include <lib_proj.h>
#include <string.h>
PROJ_HEAD(ob_tran, "General Oblique Transformation") "\n\tMisc Sph"
"\n\to_proj= plus parameters for projection"
"\n\to_lat_p= o_lon_p= (new pole) or"
"\n\to_alpha= o_lon_c= o_lat_c= or"
"\n\to_lon_1= o_lat_1= o_lon_2= o_lat_2=";
#define TOL 1e-10
FORWARD(forward);
xy = P->link->fwd(proj_translate(lp, P->en), P->link);
if (xy.x != HUGE_VAL && P->rot) {
double tmp = xy.x;
xy.x = xy.x * P->costh - xy.y * P->sinth;
xy.y = tmp * P->sinth + xy.y * P->costh;;
}
return (xy);
}
INVERSE(inverse);
if (P->rot) {
double tmp = xy.x;
xy.x = xy.x * P->costh + xy.y * P->sinth;
xy.y = tmp * - P->sinth + xy.y * P->costh;;
}
lp = P->link->inv(xy, P->link);
if (lp.lam != HUGE_VAL)
lp = proj_inv_translate(lp, P->en);
return (lp);
}
FREEUP;
if (P) {
if (P->link)
(*(P->link->pfree))(P->link);
if (P->en) free(P->en);
free(P);
}
}
ENTRY1(ob_tran, link)
int i;
double phip, lamp, theta;
const char *name, *s;
/* get name of projection to be translated */
if (!(name = proj_param(P->params, "so_proj").s)) E_ERROR(-26);
for (i = 0; (s = proj_list[i].id) && strcmp(name, s) ; ++i) ;
if (!s || !(P->link = (*proj_list[i].proj)(0))) E_ERROR(-37);
/* copy existing header into new */
P->es = 0.; /* force to spherical */
P->link->params = P->params;
P->link->over = P->over;
P->link->geoc = P->geoc;
P->link->a = P->a;
P->link->es = P->es;
P->link->ra = P->ra;
P->link->lam0 = P->lam0;
P->link->phi0 = P->phi0;
P->link->x0 = P->x0;
P->link->y0 = P->y0;
P->link->k0 = P->k0;
/* force spherical earth */
P->link->one_es = P->link->rone_es = 1.;
P->link->es = P->link->e = 0.;
if (!(P->link = proj_list[i].proj(P->link))) {
freeup(P);
return 0;
}
if ((P->rot = (fabs(theta = - proj_param(P->params, "rrot").f) != 0.))) {
P->costh = cos(theta);
P->sinth = sin(theta);
}
if (proj_param(P->params, "to_alpha").i) {
double lamc, phic, alpha;
lamc = proj_param(P->params, "ro_lon_c").f;
phic = proj_param(P->params, "ro_lat_c").f;
alpha = proj_param(P->params, "ro_alpha").f;
if (fabs(fabs(phic) - HALFPI) <= TOL)
E_ERROR(-32);
lamp = proj_atan2(-cos(alpha), -sin(alpha) * sin(phic));
P->lam0 = lamc + proj_atan2(-cos(alpha), -sin(alpha) * sin(phic)) - PI;
phip = fabs(proj_asin(cos(phic) * sin(alpha)));
lamp = P->link->lam0;
} else if (proj_param(P->params, "to_lat_p").i) { /* specified new pole */
lamp = proj_param(P->params, "ro_lon_p").f;
phip = proj_param(P->params, "ro_lat_p").f;
} else { /* specified new "equator" points */
double lam1, lam2, phi1, phi2, con;
lam1 = proj_param(P->params, "ro_lon_1").f;
phi1 = proj_param(P->params, "ro_lat_1").f;
lam2 = proj_param(P->params, "ro_lon_2").f;
phi2 = proj_param(P->params, "ro_lat_2").f;
if (fabs(phi1 - phi2) <= TOL ||
(con = fabs(phi1)) <= TOL ||
fabs(con - HALFPI) <= TOL ||
fabs(fabs(phi2) - HALFPI) <= TOL) E_ERROR(-33);
lamp = atan2(cos(phi1) * sin(phi2) * cos(lam1) -
sin(phi1) * cos(phi2) * cos(lam2),
sin(phi1) * cos(phi2) * sin(lam2) -
cos(phi1) * sin(phi2) * sin(lam1));
phip = fabs(atan(-cos(lamp - lam1) / tan(phi1)));
P->lam0 = lamp;
lamp = P->link->lam0;
}
P->fwd = forward;
P->inv = P->link->inv ? inverse : 0;
if (!(P->en = proj_translate_ini(phip, lamp))) E_ERROR_0;
ENDENTRY(P)
/*
** Log: proj_ob_tran.c
** Revision 3.2 2006/01/19 16:16:08 gie
** minor "warning"
**
** Revision 3.1 2006/01/11 01:38:18 gie
** Initial
**
*/
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