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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 degrees to radians */
static void
to_rad(POINT4D *pt)
{
pt->x *= M_PI/180.0;
pt->y *= M_PI/180.0;
}
/** convert radians to decimal degrees */
static void
to_dec(POINT4D *pt)
{
pt->x *= 180.0/M_PI;
pt->y *= 180.0/M_PI;
}
/***************************************************************************/
LWPROJ *
lwproj_from_str(const char* str_in, const char* str_out)
{
uint8_t source_is_latlong = LW_FALSE;
double semi_major_metre = DBL_MAX, semi_minor_metre = DBL_MAX;
/* Usable inputs? */
if (! (str_in && str_out))
return NULL;
PJ* pj = proj_create_crs_to_crs(PJ_DEFAULT_CTX, str_in, str_out, NULL);
if (!pj)
return NULL;
/* Fill in geodetic parameter information when a null-transform */
/* is passed, because that's how we signal we want to store */
/* that info in the cache */
if (strcmp(str_in, str_out) == 0)
{
PJ *pj_source_crs = proj_get_source_crs(PJ_DEFAULT_CTX, pj);
PJ *pj_ellps;
PJ_TYPE pj_type = proj_get_type(pj_source_crs);
if (pj_type == PJ_TYPE_UNKNOWN)
{
proj_destroy(pj);
lwerror("%s: unable to access source crs type", __func__);
return NULL;
}
source_is_latlong = (pj_type == PJ_TYPE_GEOGRAPHIC_2D_CRS) || (pj_type == PJ_TYPE_GEOGRAPHIC_3D_CRS);
pj_ellps = proj_get_ellipsoid(PJ_DEFAULT_CTX, pj_source_crs);
proj_destroy(pj_source_crs);
if (!pj_ellps)
{
proj_destroy(pj);
lwerror("%s: unable to access source crs ellipsoid", __func__);
return NULL;
}
if (!proj_ellipsoid_get_parameters(PJ_DEFAULT_CTX,
pj_ellps,
&semi_major_metre,
&semi_minor_metre,
NULL,
NULL))
{
proj_destroy(pj_ellps);
proj_destroy(pj);
lwerror("%s: unable to access source crs ellipsoid parameters", __func__);
return NULL;
}
proj_destroy(pj_ellps);
}
/* Add in an axis swap if necessary */
PJ* pj_norm = proj_normalize_for_visualization(PJ_DEFAULT_CTX, pj);
/* Swap failed for some reason? Fall back to coordinate operation */
if (!pj_norm)
pj_norm = pj;
/* Swap is not a copy of input? Clean up input */
else if (pj != pj_norm)
proj_destroy(pj);
/* Allocate and populate return value */
LWPROJ *lp = lwalloc(sizeof(LWPROJ));
lp->pj = pj_norm; /* Caller is going to have to explicitly proj_destroy this */
lp->pipeline_is_forward = true;
lp->source_is_latlong = source_is_latlong;
lp->source_semi_major_metre = semi_major_metre;
lp->source_semi_minor_metre = semi_minor_metre;
return lp;
}
LWPROJ *
lwproj_from_str_pipeline(const char* str_pipeline, bool is_forward)
{
/* Usable inputs? */
if (!str_pipeline)
return NULL;
PJ* pj = proj_create(PJ_DEFAULT_CTX, str_pipeline);
if (!pj)
return NULL;
/* check we have a transform, not a crs */
if (proj_is_crs(pj))
return NULL;
/* Add in an axis swap if necessary */
PJ* pj_norm = proj_normalize_for_visualization(PJ_DEFAULT_CTX, pj);
if (!pj_norm)
pj_norm = pj;
/* Swap is not a copy of input? Clean up input */
else if (pj != pj_norm)
proj_destroy(pj);
/* Allocate and populate return value */
LWPROJ *lp = lwalloc(sizeof(LWPROJ));
lp->pj = pj_norm; /* Caller is going to have to explicitly proj_destroy this */
lp->pipeline_is_forward = is_forward;
/* this is stuff for geography calculations; doesn't matter here */
lp->source_is_latlong = LW_FALSE;
lp->source_semi_major_metre = DBL_MAX;
lp->source_semi_minor_metre = DBL_MAX;
return lp;
}
int
lwgeom_transform_from_str(LWGEOM *geom, const char* instr, const char* outstr)
{
LWPROJ *lp = lwproj_from_str(instr, outstr);
if (!lp)
{
PJ *pj_in = proj_create(PJ_DEFAULT_CTX, instr);
if (!pj_in)
{
proj_errno_reset(NULL);
lwerror("could not parse proj string '%s'", instr);
}
proj_destroy(pj_in);
PJ *pj_out = proj_create(PJ_DEFAULT_CTX, outstr);
if (!pj_out)
{
proj_errno_reset(NULL);
lwerror("could not parse proj string '%s'", outstr);
}
proj_destroy(pj_out);
lwerror("%s: Failed to transform", __func__);
return LW_FAILURE;
}
int ret = lwgeom_transform(geom, lp);
proj_destroy(lp->pj);
lwfree(lp);
return ret;
}
int
lwgeom_transform_pipeline(LWGEOM *geom, const char* pipelinestr, bool is_forward)
{
LWPROJ *lp = lwproj_from_str_pipeline(pipelinestr, is_forward);
if (!lp)
{
PJ *pj_in = proj_create(PJ_DEFAULT_CTX, pipelinestr);
if (!pj_in)
{
proj_errno_reset(NULL);
lwerror("could not parse coordinate operation '%s'", pipelinestr);
}
proj_destroy(pj_in);
lwerror("%s: Failed to transform", __func__);
return LW_FAILURE;
}
int ret = lwgeom_transform(geom, lp);
proj_destroy(lp->pj);
lwfree(lp);
return ret;
}
int
box3d_transform(GBOX *gbox, LWPROJ *pj)
{
POINT4D pt;
POINTARRAY *pa = ptarray_construct(0, 0, 4);
pt = (POINT4D){gbox->xmin, gbox->ymin, 0, 0};
ptarray_set_point4d(pa, 0, &pt);
pt = (POINT4D){gbox->xmax, gbox->ymin, 0, 0};
ptarray_set_point4d(pa, 1, &pt);
pt = (POINT4D){gbox->xmax, gbox->ymax, 0, 0};
ptarray_set_point4d(pa, 2, &pt);
pt = (POINT4D){gbox->xmin, gbox->ymax, 0, 0};
ptarray_set_point4d(pa, 3, &pt);
ptarray_transform(pa, pj);
return ptarray_calculate_gbox_cartesian(pa, gbox);
}
int
ptarray_transform(POINTARRAY *pa, LWPROJ *pj)
{
uint32_t i;
POINT4D p;
size_t n_converted;
size_t n_points = pa->npoints;
size_t point_size = ptarray_point_size(pa);
int has_z = ptarray_has_z(pa);
double *pa_double = (double*)(pa->serialized_pointlist);
PJ_DIRECTION direction = pj->pipeline_is_forward ? PJ_FWD : PJ_INV;
/* Convert to radians if necessary */
if (proj_angular_input(pj->pj, direction))
{
for (i = 0; i < pa->npoints; i++)
{
getPoint4d_p(pa, i, &p);
to_rad(&p);
ptarray_set_point4d(pa, i, &p);
}
}
if (n_points == 1)
{
/* For single points it's faster to call proj_trans */
PJ_XYZT v = {pa_double[0], pa_double[1], has_z ? pa_double[2] : 0.0, 0.0};
PJ_COORD c;
c.xyzt = v;
PJ_COORD t = proj_trans(pj->pj, direction, c);
int pj_errno_val = proj_errno_reset(pj->pj);
if (pj_errno_val)
{
lwerror("transform: %s (%d)", proj_errno_string(pj_errno_val), pj_errno_val);
return LW_FAILURE;
}
pa_double[0] = (t.xyzt).x;
pa_double[1] = (t.xyzt).y;
if (has_z)
pa_double[2] = (t.xyzt).z;
}
else
{
/*
* size_t proj_trans_generic(PJ *P, PJ_DIRECTION direction,
* double *x, size_t sx, size_t nx,
* double *y, size_t sy, size_t ny,
* double *z, size_t sz, size_t nz,
* double *t, size_t st, size_t nt)
*/
n_converted = proj_trans_generic(pj->pj,
direction,
pa_double,
point_size,
n_points, /* X */
pa_double + 1,
point_size,
n_points, /* Y */
has_z ? pa_double + 2 : NULL,
has_z ? point_size : 0,
has_z ? n_points : 0, /* Z */
NULL,
0,
0 /* M */
);
if (n_converted != n_points)
{
lwerror("ptarray_transform: converted (%zu) != input (%zu)", n_converted, n_points);
return LW_FAILURE;
}
int pj_errno_val = proj_errno_reset(pj->pj);
if (pj_errno_val)
{
lwerror("transform: %s (%d)", proj_errno_string(pj_errno_val), pj_errno_val);
return LW_FAILURE;
}
}
/* Convert radians to degrees if necessary */
if (proj_angular_output(pj->pj, direction))
{
for (i = 0; i < pa->npoints; i++)
{
getPoint4d_p(pa, i, &p);
to_dec(&p);
ptarray_set_point4d(pa, i, &p);
}
}
return LW_SUCCESS;
}
/**
* Transform given LWGEOM geometry
* from inpj projection to outpj projection
*/
int
lwgeom_transform(LWGEOM *geom, LWPROJ *pj)
{
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, pj) ) return LW_FAILURE;
break;
}
case POLYGONTYPE:
{
LWPOLY *g = (LWPOLY*)geom;
for ( i = 0; i < g->nrings; i++ )
{
if ( ! ptarray_transform(g->rings[i], pj) ) 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], pj) ) return LW_FAILURE;
}
break;
}
default:
{
lwerror("lwgeom_transform: Cannot handle type '%s'",
lwtype_name(geom->type));
return LW_FAILURE;
}
}
return LW_SUCCESS;
}
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