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/**********************************************************************
*
* PostGIS - Spatial Types for PostgreSQL
* http://postgis.net
*
* PostGIS is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 2 of the License, or
* (at your option) any later version.
*
* PostGIS is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with PostGIS. If not, see <http://www.gnu.org/licenses/>.
*
**********************************************************************
*
* Copyright (C) 2001-2003 Refractions Research Inc.
*
**********************************************************************/
#include "../postgis_config.h"
#include "liblwgeom_internal.h"
#include "lwgeom_log.h"
#include <string.h>
/** convert decimal degress to radians */
static void
to_rad(POINT4D *pt)
{
pt->x *= M_PI/180.0;
pt->y *= M_PI/180.0;
}
/** convert radians to decimal degress */
static void
to_dec(POINT4D *pt)
{
pt->x *= 180.0/M_PI;
pt->y *= 180.0/M_PI;
}
/**
* Transform given POINTARRAY
* from inpj projection to outpj projection
*/
int
ptarray_transform(POINTARRAY *pa, projPJ inpj, projPJ outpj)
{
uint32_t i;
POINT4D p;
for ( i = 0; i < pa->npoints; i++ )
{
getPoint4d_p(pa, i, &p);
if ( ! point4d_transform(&p, inpj, outpj) ) return LW_FAILURE;
ptarray_set_point4d(pa, i, &p);
}
return LW_SUCCESS;
}
/**
* Transform given SERIALIZED geometry
* from inpj projection to outpj projection
*/
int
lwgeom_transform(LWGEOM *geom, projPJ inpj, projPJ outpj)
{
uint32_t i;
/* No points to transform in an empty! */
if ( lwgeom_is_empty(geom) )
return LW_SUCCESS;
switch(geom->type)
{
case POINTTYPE:
case LINETYPE:
case CIRCSTRINGTYPE:
case TRIANGLETYPE:
{
LWLINE *g = (LWLINE*)geom;
if ( ! ptarray_transform(g->points, inpj, outpj) ) return LW_FAILURE;
break;
}
case POLYGONTYPE:
{
LWPOLY *g = (LWPOLY*)geom;
for ( i = 0; i < g->nrings; i++ )
{
if ( ! ptarray_transform(g->rings[i], inpj, outpj) ) return LW_FAILURE;
}
break;
}
case MULTIPOINTTYPE:
case MULTILINETYPE:
case MULTIPOLYGONTYPE:
case COLLECTIONTYPE:
case COMPOUNDTYPE:
case CURVEPOLYTYPE:
case MULTICURVETYPE:
case MULTISURFACETYPE:
case POLYHEDRALSURFACETYPE:
case TINTYPE:
{
LWCOLLECTION *g = (LWCOLLECTION*)geom;
for ( i = 0; i < g->ngeoms; i++ )
{
if ( ! lwgeom_transform(g->geoms[i], inpj, outpj) ) return LW_FAILURE;
}
break;
}
default:
{
lwerror("lwgeom_transform: Cannot handle type '%s'",
lwtype_name(geom->type));
return LW_FAILURE;
}
}
return LW_SUCCESS;
}
int
point4d_transform(POINT4D *pt, projPJ srcpj, projPJ dstpj)
{
POINT3D orig_pt = {pt->x, pt->y, pt->z}; /* Copy for error report*/
if (pj_is_latlong(srcpj)) to_rad(pt) ;
LWDEBUGF(4, "transforming POINT(%f %f) from '%s' to '%s'",
orig_pt.x, orig_pt.y, pj_get_def(srcpj,0), pj_get_def(dstpj,0));
if (pj_transform(srcpj, dstpj, 1, 0, &(pt->x), &(pt->y), &(pt->z)) != 0)
{
int pj_errno_val = *pj_get_errno_ref();
if (pj_errno_val == -38)
{
lwnotice("PostGIS was unable to transform the point because either no grid"
" shift files were found, or the point does not lie within the "
"range for which the grid shift is defined. Refer to the "
"ST_Transform() section of the PostGIS manual for details on how "
"to configure PostGIS to alter this behaviour.");
lwerror("transform: couldn't project point (%g %g %g): %s (%d)",
orig_pt.x, orig_pt.y, orig_pt.z,
pj_strerrno(pj_errno_val), pj_errno_val);
}
else
{
lwerror("transform: couldn't project point (%g %g %g): %s (%d)",
orig_pt.x, orig_pt.y, orig_pt.z,
pj_strerrno(pj_errno_val), pj_errno_val);
}
return LW_FAILURE;
}
if (pj_is_latlong(dstpj)) to_dec(pt);
return LW_SUCCESS;
}
projPJ
lwproj_from_string(const char *str1)
{
if (!str1 || str1[0] == '\0')
{
return NULL;
}
return pj_init_plus(str1);
}
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