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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.
*/
/*
** projection initialization and closure
*/
#define PROJ_LIB__
#include <lib_proj.h>
#include <stdio.h>
#include <string.h>
#include <errno.h>
PROJ *
proj_init(int argc, char **argv) {
const char *s, *name;
PROJ *(*proj)(PROJ *);
paralist *curr = 0, *start = 0;
int i;
PROJ *PIN = 0;
errno = proj_errno = 0;
/* put arguments into internal linked list */
if (argc <= 0) { proj_errno = -1; goto bum_call; }
for (i = 0; i < argc; ++i)
if (i)
curr = curr->next = proj_mkparam(argv[i]);
else
start = curr = proj_mkparam(argv[i]);
if (proj_errno) goto bum_call;
/* find projection selection */
if (!(name = proj_param(start, "sproj").s))
{ proj_errno = -4; goto bum_call; }
for (i = 0; (s = proj_list[i].id) && strcmp(name, s) ; ++i) ;
if (!s) { proj_errno = -5; goto bum_call; }
proj = proj_list[i].proj;
/* allocate projection structure */
if (!(PIN = (*proj)(0))) goto bum_call;
PIN->params = start;
/* set ellipsoid/sphere parameters */
if (proj_ell_set(start, &PIN->a, &PIN->es)) goto bum_call;
PIN->e = sqrt(PIN->es);
PIN->ra = 1. / PIN->a;
PIN->one_es = 1. - PIN->es;
if (PIN->one_es == 0.) { proj_errno = -6; goto bum_call; }
PIN->rone_es = 1./PIN->one_es;
/* set PIN->geoc coordinate system */
PIN->geoc = (PIN->es && proj_param(start, "bgeoc").i);
/* over-ranging flag */
PIN->over = proj_param(start, "bover").i;
/* central meridian */
PIN->lam0=proj_param(start, "rlon_0").f;
/* central latitude */
PIN->phi0 = proj_param(start, "rlat_0").f;
/* false easting and northing */
PIN->x0 = proj_param(start, "dx_0").f;
PIN->y0 = proj_param(start, "dy_0").f;
/* general scaling factor */
if (proj_param(start, "tk_0").i)
PIN->k0 = proj_param(start, "dk_0").f;
else if (proj_param(start, "tk").i)
PIN->k0 = proj_param(start, "dk").f;
else
PIN->k0 = 1.;
if (PIN->k0 <= 0.) {
proj_errno = -31;
goto bum_call;
}
/* set units */
s = 0;
if ((name = proj_param(start, "sunits").s)) {
for (i = 0; (s = proj_units[i].id) && strcmp(name, s) ; ++i) ;
if (!s) { proj_errno = -7; goto bum_call; }
s = proj_units[i].to_meter;
}
if (s || (s = proj_param(start, "sto_meter").s)) {
PIN->to_meter = strtod(s, (char **)&s);
if (*s == '/') /* ratio number */
PIN->to_meter /= strtod(++s, 0);
PIN->fr_meter = 1. / PIN->to_meter;
} else
PIN->to_meter = PIN->fr_meter = 1.;
/* projection specific initialization */
if (!(PIN = (*proj)(PIN)) || errno || proj_errno) {
bum_call: /* cleanup error return */
if (!proj_errno)
proj_errno = errno;
if (PIN)
proj_free(PIN);
else
for ( ; start; start = curr) {
curr = start->next;
free(start);
}
PIN = 0;
}
return PIN;
}
void
proj_free(PROJ *P) {
if (P) {
paralist *t = P->params, *n;
/* free parameter list elements */
for (t = P->params; t; t = n) {
n = t->next;
free(t);
}
/* free projection parameters */
P->pfree(P);
}
}
/* Revision log
** Log: proj_init.c
** Revision 3.1 2006/01/11 01:38:18 gie
** Initial
**
*/
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