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/*
** libproj -- library of cartographic projections
**
** Copyright (c) 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_LIB__
#define PROJ_PARMS__ \
double N0, N1;
# include <lib_proj.h>
PROJ_HEAD(trapez, "Trapezoidal") "\n\tPCyl., Sph.\n\tlat_1= lat_2=";
FORWARD(s_forward); /* spheroid */
xy.x = lp.lam * (lp.phi * P->N1 - P->N0);
xy.y = lp.phi - P->phi0;
return (xy);
}
INVERSE(s_inverse); /* spheroid */
lp.phi = xy.y + P->phi0;
lp.lam = xy.x / (lp.phi * P->N1 - P->N0);
return (lp);
}
FREEUP; if (P) free(P); }
ENTRY0(trapez)
if (proj_param(P->params, "tlat_1").i && proj_param(P->params, "tlat_2").i) {
double phi1, phi2, cp1, cp2, d;
cp1 = cos(phi1 = proj_param(P->params, "rlat_1").f);
cp2 = cos(phi2 = proj_param(P->params, "rlat_2").f);
if ((d = phi1- phi2) == 0)
E_ERROR(-33)
P->N1 = (cp1 - cp2)/d;
P->N0 = (phi2 * cp1 - phi1 * cp2)/d;
} else
E_ERROR(-41)
P->es = 0.;
P->fwd = s_forward;
P->inv = s_inverse;
ENDENTRY(P)
/*
** Log: proj_trapez.c
** Revision 3.1 2006/01/11 01:38:18 gie
** Initial
**
*/
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