mirror of
https://git.osgeo.org/gitea/postgis/postgis
synced 2024-10-24 17:12:35 +00:00
324d89ae14
git-svn-id: http://svn.osgeo.org/postgis/trunk@12873 b70326c6-7e19-0410-871a-916f4a2858ee
564 lines
13 KiB
C
564 lines
13 KiB
C
/**********************************************************************
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*
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* PostGIS - Spatial Types for PostgreSQL
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* http://postgis.net
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*
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* Wrapper around SFCGAL for 3D functions
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*
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* Copyright 2012-2013 Oslandia <infos@oslandia.com>
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*
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* This is free software; you can redistribute and/or modify it under
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* the terms of the GNU General Public Licence. See the COPYING file.
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*
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**********************************************************************/
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#include "lwgeom_sfcgal.h"
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static int SFCGAL_type_to_lwgeom_type(sfcgal_geometry_type_t type);
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static POINTARRAY* ptarray_from_SFCGAL(const sfcgal_geometry_t* geom, int force3D);
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static sfcgal_geometry_t* ptarray_to_SFCGAL(const POINTARRAY* pa, int type);
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/* Return SFCGAL version string */
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const char*
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lwgeom_sfcgal_version()
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{
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const char *version = sfcgal_version();
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return version;
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}
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/*
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* Mapping between SFCGAL and PostGIS types
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*
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* Throw an error if type is unsupported
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*/
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static int
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SFCGAL_type_to_lwgeom_type(sfcgal_geometry_type_t type)
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{
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switch (type)
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{
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case SFCGAL_TYPE_POINT:
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return POINTTYPE;
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case SFCGAL_TYPE_LINESTRING:
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return LINETYPE;
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case SFCGAL_TYPE_POLYGON:
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return POLYGONTYPE;
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case SFCGAL_TYPE_MULTIPOINT:
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return MULTIPOINTTYPE;
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case SFCGAL_TYPE_MULTILINESTRING:
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return MULTILINETYPE;
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case SFCGAL_TYPE_MULTIPOLYGON:
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return MULTIPOLYGONTYPE;
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case SFCGAL_TYPE_MULTISOLID:
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return COLLECTIONTYPE; /* Nota: PolyhedralSurface closed inside
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aim is to use true solid type as soon
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as available in OGC SFS */
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case SFCGAL_TYPE_GEOMETRYCOLLECTION:
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return COLLECTIONTYPE;
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#if 0
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case SFCGAL_TYPE_CIRCULARSTRING:
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return CIRCSTRINGTYPE;
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case SFCGAL_TYPE_COMPOUNDCURVE:
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return COMPOUNDTYPE;
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case SFCGAL_TYPE_CURVEPOLYGON:
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return CURVEPOLYTYPE;
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case SFCGAL_TYPE_MULTICURVE:
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return MULTICURVETYPE;
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case SFCGAL_TYPE_MULTISURFACE:
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return MULTISURFACETYPE;
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#endif
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case SFCGAL_TYPE_POLYHEDRALSURFACE:
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return POLYHEDRALSURFACETYPE;
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case SFCGAL_TYPE_TRIANGULATEDSURFACE:
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return TINTYPE;
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case SFCGAL_TYPE_TRIANGLE:
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return TRIANGLETYPE;
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default:
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lwerror("SFCGAL_type_to_lwgeom_type: Unknown Type");
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return 0;
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}
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}
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/*
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* Return a PostGIS pointarray from a simple SFCGAL geometry:
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* POINT, LINESTRING or TRIANGLE
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*
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* Trought an error on others types
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*/
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static POINTARRAY*
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ptarray_from_SFCGAL(const sfcgal_geometry_t* geom, int want3d)
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{
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POINT4D point;
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uint32_t i, npoints;
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POINTARRAY* pa = NULL;
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assert(geom);
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switch (sfcgal_geometry_type_id(geom))
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{
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case SFCGAL_TYPE_POINT:
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{
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pa = ptarray_construct(want3d, 0, 1);
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point.x = sfcgal_point_x(geom);
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point.y = sfcgal_point_y(geom);
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if (sfcgal_geometry_is_3d(geom))
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point.z = sfcgal_point_z(geom);
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else if (want3d)
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point.z = 0.0;
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ptarray_set_point4d(pa, 0, &point);
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}
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break;
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case SFCGAL_TYPE_LINESTRING:
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{
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npoints = sfcgal_linestring_num_points(geom);
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pa = ptarray_construct(want3d, 0, npoints);
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for (i = 0; i < npoints; i++)
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{
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const sfcgal_geometry_t* pt = sfcgal_linestring_point_n(geom, i);
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point.x = sfcgal_point_x(pt);
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point.y = sfcgal_point_y(pt);
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if (sfcgal_geometry_is_3d(geom))
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point.z = sfcgal_point_z(pt);
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else if (want3d)
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point.z = 0.0;
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ptarray_set_point4d(pa, i, &point);
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}
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}
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break;
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case SFCGAL_TYPE_TRIANGLE:
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{
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pa = ptarray_construct(want3d, 0, 4);
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for (i = 0; i < 4; i++)
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{
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const sfcgal_geometry_t* pt = sfcgal_triangle_vertex(geom, (i%3));
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point.x = sfcgal_point_x(pt);
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point.y = sfcgal_point_y(pt);
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if ( sfcgal_geometry_is_3d(geom))
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point.z = sfcgal_point_z(pt);
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else if (want3d)
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point.z = 0.0;
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ptarray_set_point4d(pa, i, &point);
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}
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}
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break;
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/* Other types should not be called directly ... */
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default:
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lwerror("ptarray_from_SFCGAL: Unknown Type");
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break;
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}
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return pa;
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}
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/*
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* Convert a PostGIS pointarray to SFCGAL structure
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*
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* Used for simple LWGEOM geometry POINT, LINESTRING, TRIANGLE
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* and POLYGON rings
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*/
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static sfcgal_geometry_t*
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ptarray_to_SFCGAL(const POINTARRAY* pa, int type)
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{
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POINT3DZ point;
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int is_3d;
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uint32_t i;
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assert(pa);
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is_3d = FLAGS_GET_Z(pa->flags) != 0;
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switch (type)
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{
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case POINTTYPE:
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{
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getPoint3dz_p(pa, 0, &point);
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if (is_3d) return sfcgal_point_create_from_xyz(point.x, point.y, point.z);
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else return sfcgal_point_create_from_xy(point.x, point.y);
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}
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break;
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case LINETYPE:
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{
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sfcgal_geometry_t* line = sfcgal_linestring_create();
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for (i = 0; i < pa->npoints; i++)
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{
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getPoint3dz_p(pa, i, &point);
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if (is_3d)
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{
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sfcgal_linestring_add_point(line,
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sfcgal_point_create_from_xyz(point.x, point.y, point.z));
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}
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else
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{
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sfcgal_linestring_add_point(line,
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sfcgal_point_create_from_xy(point.x, point.y));
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}
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}
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return line;
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}
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break;
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case TRIANGLETYPE:
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{
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sfcgal_geometry_t* triangle = sfcgal_triangle_create();
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getPoint3dz_p(pa, 0, &point);
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if (is_3d) sfcgal_triangle_set_vertex_from_xyz(triangle, 0, point.x, point.y, point.z);
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else sfcgal_triangle_set_vertex_from_xy (triangle, 0, point.x, point.y);
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getPoint3dz_p(pa, 1, &point);
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if (is_3d) sfcgal_triangle_set_vertex_from_xyz(triangle, 1, point.x, point.y, point.z);
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else sfcgal_triangle_set_vertex_from_xy (triangle, 1, point.x, point.y);
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getPoint3dz_p(pa, 2, &point);
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if (is_3d) sfcgal_triangle_set_vertex_from_xyz(triangle, 2, point.x, point.y, point.z);
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else sfcgal_triangle_set_vertex_from_xy (triangle, 2, point.x, point.y);
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return triangle;
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}
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break;
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/* Other SFCGAL types should not be called directly ... */
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default:
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lwerror("ptarray_from_SFCGAL: Unknown Type");
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return NULL;
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}
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}
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/*
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* Convert a SFCGAL structure to PostGIS LWGEOM
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*
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* Throws an error on unsupported type
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*/
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LWGEOM*
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SFCGAL2LWGEOM(const sfcgal_geometry_t* geom, int force3D, int srid)
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{
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uint32_t ngeoms, nshells;
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uint32_t i, j, k;
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int want3d;
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assert(geom);
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want3d = force3D || sfcgal_geometry_is_3d(geom);
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switch (sfcgal_geometry_type_id(geom))
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{
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case SFCGAL_TYPE_POINT:
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{
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if (sfcgal_geometry_is_empty(geom))
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return (LWGEOM*) lwpoint_construct_empty(srid, want3d, 0);
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POINTARRAY* pa = ptarray_from_SFCGAL(geom, want3d);
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return (LWGEOM*) lwpoint_construct(srid, NULL, pa);
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}
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case SFCGAL_TYPE_LINESTRING:
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{
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if (sfcgal_geometry_is_empty(geom))
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return (LWGEOM*) lwline_construct_empty(srid, want3d, 0);
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POINTARRAY* pa = ptarray_from_SFCGAL(geom, want3d);
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return (LWGEOM*) lwline_construct(srid, NULL, pa);
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}
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case SFCGAL_TYPE_TRIANGLE:
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{
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if (sfcgal_geometry_is_empty(geom))
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return (LWGEOM*) lwtriangle_construct_empty(srid, want3d, 0);
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POINTARRAY* pa = ptarray_from_SFCGAL(geom, want3d);
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return (LWGEOM*) lwtriangle_construct(srid, NULL, pa);
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}
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case SFCGAL_TYPE_POLYGON:
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{
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if (sfcgal_geometry_is_empty(geom))
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return (LWGEOM*) lwpoly_construct_empty(srid, want3d, 0);
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uint32_t nrings = sfcgal_polygon_num_interior_rings(geom) + 1;
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POINTARRAY** pa = (POINTARRAY**) lwalloc(sizeof(POINTARRAY*) * nrings);
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pa[0] = ptarray_from_SFCGAL(sfcgal_polygon_exterior_ring(geom), want3d);
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for (i = 1; i < nrings; i++)
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pa[i] = ptarray_from_SFCGAL(sfcgal_polygon_interior_ring_n(geom, i-1), want3d);
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return (LWGEOM*) lwpoly_construct(srid, NULL, nrings, pa);
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}
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case SFCGAL_TYPE_MULTIPOINT:
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case SFCGAL_TYPE_MULTILINESTRING:
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case SFCGAL_TYPE_MULTIPOLYGON:
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case SFCGAL_TYPE_MULTISOLID:
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case SFCGAL_TYPE_GEOMETRYCOLLECTION:
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{
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ngeoms = sfcgal_geometry_collection_num_geometries(geom);
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LWGEOM** geoms = NULL;
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if (ngeoms)
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{
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geoms = (LWGEOM**) lwalloc(sizeof(LWGEOM*) * ngeoms);
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for (i = 0; i < ngeoms; i++)
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{
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const sfcgal_geometry_t* g = sfcgal_geometry_collection_geometry_n(geom, i);
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geoms[i] = SFCGAL2LWGEOM(g, 0, srid);
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}
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geoms = (LWGEOM**) lwrealloc(geoms, sizeof(LWGEOM*) * ngeoms);
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}
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return (LWGEOM*) lwcollection_construct(SFCGAL_type_to_lwgeom_type(
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sfcgal_geometry_type_id(geom)), srid, NULL, ngeoms, geoms);
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}
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#if 0
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case SFCGAL_TYPE_CIRCULARSTRING:
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case SFCGAL_TYPE_COMPOUNDCURVE:
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case SFCGAL_TYPE_CURVEPOLYGON:
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case SFCGAL_TYPE_MULTICURVE:
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case SFCGAL_TYPE_MULTISURFACE:
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case SFCGAL_TYPE_CURVE:
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case SFCGAL_TYPE_SURFACE:
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/* TODO curve types handling */
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#endif
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case SFCGAL_TYPE_POLYHEDRALSURFACE:
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{
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ngeoms = sfcgal_polyhedral_surface_num_polygons(geom);
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LWGEOM** geoms = NULL;
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if (ngeoms)
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{
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geoms = (LWGEOM**) lwalloc(sizeof(LWGEOM*) * ngeoms);
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for (i = 0; i < ngeoms; i++)
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{
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const sfcgal_geometry_t* g = sfcgal_polyhedral_surface_polygon_n( geom, i );
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geoms[i] = SFCGAL2LWGEOM(g, 0, srid);
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}
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}
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return (LWGEOM*)lwcollection_construct(POLYHEDRALSURFACETYPE, srid, NULL, ngeoms, geoms);
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}
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/* Solid is map as a closed PolyhedralSurface (for now) */
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case SFCGAL_TYPE_SOLID:
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{
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nshells = sfcgal_solid_num_shells(geom);
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for (ngeoms = 0, i = 0; i < nshells; i++)
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ngeoms += sfcgal_polyhedral_surface_num_polygons(sfcgal_solid_shell_n(geom, i));
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LWGEOM** geoms = 0;
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if (ngeoms)
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{
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geoms = (LWGEOM**) lwalloc( sizeof(LWGEOM*) * ngeoms);
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for (i = 0, k =0 ; i < nshells; i++)
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{
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const sfcgal_geometry_t* shell = sfcgal_solid_shell_n(geom, i);
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ngeoms = sfcgal_polyhedral_surface_num_polygons(shell);
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for (j = 0; j < ngeoms; j++)
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{
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const sfcgal_geometry_t* g = sfcgal_polyhedral_surface_polygon_n(shell, j);
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geoms[k] = SFCGAL2LWGEOM(g, 1, srid);
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k++;
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}
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}
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}
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LWGEOM* rgeom = (LWGEOM*) lwcollection_construct(POLYHEDRALSURFACETYPE, srid, NULL, ngeoms, geoms);
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if (ngeoms) FLAGS_SET_SOLID( rgeom->flags, 1);
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return rgeom;
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}
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case SFCGAL_TYPE_TRIANGULATEDSURFACE:
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{
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ngeoms = sfcgal_triangulated_surface_num_triangles(geom);
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LWGEOM** geoms = NULL;
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if (ngeoms)
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{
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geoms = (LWGEOM**) lwalloc(sizeof(LWGEOM*) * ngeoms);
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for (i = 0; i < ngeoms; i++)
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{
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const sfcgal_geometry_t* g = sfcgal_triangulated_surface_triangle_n(geom, i);
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geoms[i] = SFCGAL2LWGEOM(g, 0, srid);
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}
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}
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return (LWGEOM*) lwcollection_construct(TINTYPE, srid, NULL, ngeoms, geoms);
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}
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default:
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lwerror("SFCGAL2LWGEOM: Unknown Type");
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return NULL;
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}
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}
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sfcgal_geometry_t*
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LWGEOM2SFCGAL(const LWGEOM* geom)
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{
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uint32_t i;
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sfcgal_geometry_t* ret_geom = NULL;
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assert(geom);
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switch (geom->type)
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{
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case POINTTYPE:
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{
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const LWPOINT* lwp = (const LWPOINT*) geom;
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if (lwgeom_is_empty(geom)) return sfcgal_point_create();
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return ptarray_to_SFCGAL(lwp->point, POINTTYPE);
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}
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break;
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case LINETYPE:
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{
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const LWLINE* line = (const LWLINE*) geom;
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if (lwgeom_is_empty(geom)) return sfcgal_linestring_create();
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return ptarray_to_SFCGAL(line->points, LINETYPE);
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}
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break;
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case TRIANGLETYPE:
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{
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const LWTRIANGLE* triangle = (const LWTRIANGLE*) geom;
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if (lwgeom_is_empty(geom)) return sfcgal_triangle_create();
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return ptarray_to_SFCGAL(triangle->points, TRIANGLETYPE);
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}
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break;
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case POLYGONTYPE:
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{
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const LWPOLY* poly = (const LWPOLY*) geom;
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uint32_t nrings = poly->nrings - 1;
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if (lwgeom_is_empty(geom)) return sfcgal_polygon_create();
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sfcgal_geometry_t* exterior_ring = ptarray_to_SFCGAL(poly->rings[0], LINETYPE);
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ret_geom = sfcgal_polygon_create_from_exterior_ring(exterior_ring);
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for (i = 0; i < nrings; i++)
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{
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sfcgal_geometry_t* ring = ptarray_to_SFCGAL(poly->rings[i + 1], LINETYPE);
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sfcgal_polygon_add_interior_ring(ret_geom, ring);
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}
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return ret_geom;
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}
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break;
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case MULTIPOINTTYPE:
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case MULTILINETYPE:
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case MULTIPOLYGONTYPE:
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case COLLECTIONTYPE:
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{
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if (geom->type == MULTIPOINTTYPE) ret_geom = sfcgal_multi_point_create();
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else if (geom->type == MULTILINETYPE) ret_geom = sfcgal_multi_linestring_create();
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else if (geom->type == MULTIPOLYGONTYPE) ret_geom = sfcgal_multi_polygon_create();
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else ret_geom = sfcgal_geometry_collection_create();
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const LWCOLLECTION* lwc = (const LWCOLLECTION*)geom;
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for (i = 0; i < lwc->ngeoms; i++)
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{
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sfcgal_geometry_t* g = LWGEOM2SFCGAL(lwc->geoms[i]);
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sfcgal_geometry_collection_add_geometry(ret_geom, g);
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}
|
|
|
|
return ret_geom;
|
|
}
|
|
break;
|
|
|
|
case POLYHEDRALSURFACETYPE:
|
|
{
|
|
const LWPSURFACE* lwp = (const LWPSURFACE*) geom;
|
|
ret_geom = sfcgal_polyhedral_surface_create();
|
|
|
|
for (i = 0; i < lwp->ngeoms; i++)
|
|
{
|
|
sfcgal_geometry_t* g = LWGEOM2SFCGAL((const LWGEOM*) lwp->geoms[i]);
|
|
sfcgal_polyhedral_surface_add_polygon(ret_geom, g);
|
|
}
|
|
/* We treat polyhedral surface as the only exterior shell,
|
|
since we can't distinguish exterior from interior shells ... */
|
|
if (FLAGS_GET_SOLID(lwp->flags))
|
|
{
|
|
return sfcgal_solid_create_from_exterior_shell(ret_geom);
|
|
}
|
|
|
|
return ret_geom;
|
|
}
|
|
break;
|
|
|
|
case TINTYPE:
|
|
{
|
|
const LWTIN* lwp = (const LWTIN*) geom;
|
|
ret_geom = sfcgal_triangulated_surface_create();
|
|
|
|
for (i = 0; i < lwp->ngeoms; i++)
|
|
{
|
|
sfcgal_geometry_t* g = LWGEOM2SFCGAL((const LWGEOM*) lwp->geoms[i]);
|
|
sfcgal_triangulated_surface_add_triangle(ret_geom, g);
|
|
}
|
|
|
|
return ret_geom;
|
|
}
|
|
break;
|
|
|
|
default:
|
|
lwerror("LWGEOM2SFCGAL: Unknown geometry type !");
|
|
return NULL;
|
|
}
|
|
}
|
|
|
|
|
|
/*
|
|
* No Operation SFCGAL function, used (only) for cunit tests
|
|
* Take a PostGIS geometry, send it to SFCGAL and return it unchanged (in theory)
|
|
*/
|
|
LWGEOM* lwgeom_sfcgal_noop(const LWGEOM* geom_in)
|
|
{
|
|
sfcgal_geometry_t* converted;
|
|
|
|
assert(geom_in);
|
|
|
|
converted = LWGEOM2SFCGAL(geom_in);
|
|
assert(converted);
|
|
|
|
LWGEOM* geom_out = SFCGAL2LWGEOM(converted, 0, SRID_UNKNOWN);
|
|
sfcgal_geometry_delete(converted);
|
|
|
|
/* copy SRID (SFCGAL does not store the SRID) */
|
|
geom_out->srid = geom_in->srid;
|
|
return geom_out;
|
|
}
|