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/*
** libproj -- library of cartographic projections
**
** Copyright (c) 2003, 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__ \
double cosphi1; \
int mode;
#define PROJ_LIB__
#include <lib_proj.h>
PROJ_HEAD(aitoff, "Aitoff") "\n\tMisc Sph";
PROJ_HEAD(wintri, "Winkel Tripel") "\n\tMisc Sph\n\tlat_1=";
FORWARD(s_forward); /* spheroid */
double c, d;
if ((d = proj_acos(cos(lp.phi) * cos(0.5 * lp.lam)))) { /* basic Aitoff */
c = sin(lp.phi)/sin(d);
xy.x = 2. * d * sqrt(fabs(1. - c * c));
if (lp.lam < 0.)
xy.x = -xy.x;
xy.y = d * c;
} else
xy.x = xy.y = 0.;
if (P->mode) { /* Winkel Tripel */
xy.x = (xy.x + lp.lam * P->cosphi1) * 0.5;
xy.y = (xy.y + lp.phi) * 0.5;
}
return (xy);
}
FREEUP; if (P) free(P); }
static PROJ *
setup(PROJ *P) {
P->inv = 0;
P->fwd = s_forward;
P->es = 0.;
return P;
}
ENTRY0(aitoff)
P->mode = 0;
ENDENTRY(setup(P))
ENTRY0(wintri)
P->mode = 1;
if (proj_param(P->params, "tlat_1").i) {
if ((P->cosphi1 = cos(proj_param(P->params, "rlat_1").f)) <= 0.)
E_ERROR(-22)
} else /* 50d28' or acos(2/pi) */
P->cosphi1 = 0.636619772367581343;
ENDENTRY(setup(P))
/*
** Log: proj_aitoff.c
** Revision 3.1 2006/01/11 01:38:18 gie
** Initial
**
*/
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