592 lines
15 KiB
C
592 lines
15 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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* PostGIS is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 2 of the License, or
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* (at your option) any later version.
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*
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* PostGIS is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with PostGIS. If not, see <http://www.gnu.org/licenses/>.
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*
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**********************************************************************
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*
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* Copyright 2011-2015 Sandro Santilli <strk@kbt.io>
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*
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**********************************************************************/
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#include "../postgis_config.h"
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/*#define POSTGIS_DEBUG_LEVEL 4*/
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#include "lwgeom_geos.h"
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#include "liblwgeom_internal.h"
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#include <string.h>
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#include <assert.h>
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static LWGEOM* lwline_split_by_line(const LWLINE* lwgeom_in, const LWGEOM* blade_in);
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static LWGEOM* lwline_split_by_point(const LWLINE* lwgeom_in, const LWPOINT* blade_in);
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static LWGEOM* lwline_split_by_mpoint(const LWLINE* lwgeom_in, const LWMPOINT* blade_in);
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static LWGEOM* lwline_split(const LWLINE* lwgeom_in, const LWGEOM* blade_in);
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static LWGEOM* lwpoly_split_by_line(const LWPOLY* lwgeom_in, const LWGEOM* blade_in);
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static LWGEOM* lwcollection_split(const LWCOLLECTION* lwcoll_in, const LWGEOM* blade_in);
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static LWGEOM* lwpoly_split(const LWPOLY* lwpoly_in, const LWGEOM* blade_in);
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/* Initializes and uses GEOS internally */
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static LWGEOM*
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lwline_split_by_line(const LWLINE* lwline_in, const LWGEOM* blade_in)
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{
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LWGEOM** components;
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LWGEOM* diff;
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LWCOLLECTION* out;
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GEOSGeometry* gdiff; /* difference */
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GEOSGeometry* g1;
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GEOSGeometry* g2;
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int ret;
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/* ASSERT blade_in is LINE or MULTILINE */
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assert (blade_in->type == LINETYPE ||
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blade_in->type == MULTILINETYPE ||
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blade_in->type == POLYGONTYPE ||
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blade_in->type == MULTIPOLYGONTYPE );
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/* Possible outcomes:
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*
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* 1. The lines do not cross or overlap
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* -> Return a collection with single element
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* 2. The lines cross
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* -> Return a collection of all elements resulting from the split
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*/
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initGEOS(lwgeom_geos_error, lwgeom_geos_error);
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g1 = LWGEOM2GEOS((LWGEOM*)lwline_in, 0);
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if ( ! g1 )
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{
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lwerror("LWGEOM2GEOS: %s", lwgeom_geos_errmsg);
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return NULL;
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}
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g2 = LWGEOM2GEOS(blade_in, 0);
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if ( ! g2 )
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{
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GEOSGeom_destroy(g1);
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lwerror("LWGEOM2GEOS: %s", lwgeom_geos_errmsg);
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return NULL;
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}
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/* If blade is a polygon, pick its boundary */
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if ( blade_in->type == POLYGONTYPE || blade_in->type == MULTIPOLYGONTYPE )
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{
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gdiff = GEOSBoundary(g2);
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GEOSGeom_destroy(g2);
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if ( ! gdiff )
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{
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GEOSGeom_destroy(g1);
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lwerror("GEOSBoundary: %s", lwgeom_geos_errmsg);
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return NULL;
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}
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g2 = gdiff; gdiff = NULL;
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}
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/* If interior intersecton is linear we can't split */
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ret = GEOSRelatePattern(g1, g2, "1********");
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if ( 2 == ret )
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{
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lwerror("GEOSRelatePattern: %s", lwgeom_geos_errmsg);
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GEOSGeom_destroy(g1);
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GEOSGeom_destroy(g2);
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return NULL;
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}
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if ( ret )
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{
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GEOSGeom_destroy(g1);
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GEOSGeom_destroy(g2);
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lwerror("Splitter line has linear intersection with input");
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return NULL;
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}
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gdiff = GEOSDifference(g1,g2);
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GEOSGeom_destroy(g1);
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GEOSGeom_destroy(g2);
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if (gdiff == NULL)
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{
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lwerror("GEOSDifference: %s", lwgeom_geos_errmsg);
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return NULL;
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}
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diff = GEOS2LWGEOM(gdiff, FLAGS_GET_Z(lwline_in->flags));
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GEOSGeom_destroy(gdiff);
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if (NULL == diff)
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{
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lwerror("GEOS2LWGEOM: %s", lwgeom_geos_errmsg);
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return NULL;
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}
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out = lwgeom_as_lwcollection(diff);
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if ( ! out )
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{
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components = lwalloc(sizeof(LWGEOM*)*1);
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components[0] = diff;
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out = lwcollection_construct(COLLECTIONTYPE, lwline_in->srid,
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NULL, 1, components);
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}
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else
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{
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/* Set SRID */
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lwgeom_set_srid((LWGEOM*)out, lwline_in->srid);
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/* Force collection type */
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out->type = COLLECTIONTYPE;
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}
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return (LWGEOM*)out;
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}
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static LWGEOM*
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lwline_split_by_point(const LWLINE* lwline_in, const LWPOINT* blade_in)
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{
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LWMLINE* out;
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out = lwmline_construct_empty(lwline_in->srid,
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FLAGS_GET_Z(lwline_in->flags),
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FLAGS_GET_M(lwline_in->flags));
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if ( lwline_split_by_point_to(lwline_in, blade_in, out) < 2 )
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{
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lwmline_add_lwline(out, lwline_clone_deep(lwline_in));
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}
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/* Turn multiline into collection */
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out->type = COLLECTIONTYPE;
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return (LWGEOM*)out;
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}
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static LWGEOM*
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lwline_split_by_mpoint(const LWLINE* lwline_in, const LWMPOINT* mp)
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{
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LWMLINE* out;
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uint32_t i, j;
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out = lwmline_construct_empty(lwline_in->srid,
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FLAGS_GET_Z(lwline_in->flags),
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FLAGS_GET_M(lwline_in->flags));
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lwmline_add_lwline(out, lwline_clone_deep(lwline_in));
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for (i=0; i<mp->ngeoms; ++i)
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{
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for (j=0; j<out->ngeoms; ++j)
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{
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lwline_in = out->geoms[j];
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LWPOINT *blade_in = mp->geoms[i];
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int ret = lwline_split_by_point_to(lwline_in, blade_in, out);
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if ( 2 == ret )
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{
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/* the point splits this line,
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* 2 splits were added to collection.
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* We'll move the latest added into
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* the slot of the current one.
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*/
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lwline_free(out->geoms[j]);
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out->geoms[j] = out->geoms[--out->ngeoms];
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}
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}
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}
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/* Turn multiline into collection */
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out->type = COLLECTIONTYPE;
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return (LWGEOM*)out;
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}
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int
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lwline_split_by_point_to(const LWLINE* lwline_in, const LWPOINT* blade_in,
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LWMLINE* v)
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{
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double mindist_sqr = -1;
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POINT4D pt, pt_projected;
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POINT4D p1, p2;
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POINTARRAY *ipa = lwline_in->points;
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POINTARRAY* pa1;
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POINTARRAY* pa2;
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uint32_t i, nsegs, seg = UINT32_MAX;
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/* Possible outcomes:
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*
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* 1. The point is not on the line or on the boundary
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* -> Leave collection untouched, return 0
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* 2. The point is on the boundary
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* -> Leave collection untouched, return 1
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* 3. The point is in the line
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* -> Push 2 elements on the collection:
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* o start_point - cut_point
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* o cut_point - last_point
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* -> Return 2
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*/
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getPoint4d_p(blade_in->point, 0, &pt);
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/* Find closest segment */
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if ( ipa->npoints < 1 ) return 0; /* empty input line */
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getPoint4d_p(ipa, 0, &p1);
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nsegs = ipa->npoints - 1;
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for ( i = 0; i < nsegs; i++ )
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{
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getPoint4d_p(ipa, i+1, &p2);
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double dist_sqr = distance2d_sqr_pt_seg((POINT2D *)&pt, (POINT2D *)&p1, (POINT2D *)&p2);
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LWDEBUGF(4, "Distance (squared) of point %g %g to segment %g %g, %g %g: %g",
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pt.x, pt.y,
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p1.x, p1.y,
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p2.x, p2.y,
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dist_sqr);
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if (i == 0 || dist_sqr < mindist_sqr)
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{
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mindist_sqr = dist_sqr;
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seg=i;
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if (mindist_sqr == 0.0)
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break; /* can't be closer than ON line */
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}
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p1 = p2;
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}
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LWDEBUGF(3, "Closest segment: %d", seg);
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LWDEBUGF(3, "mindist: %g", mindist_sqr);
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/* No intersection */
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if (mindist_sqr > 0)
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return 0;
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/* empty or single-point line, intersection on boundary */
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if ( seg == UINT32_MAX ) return 1;
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/*
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* We need to project the
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* point on the closest segment,
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* to interpolate Z and M if needed
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*/
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getPoint4d_p(ipa, seg, &p1);
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getPoint4d_p(ipa, seg+1, &p2);
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closest_point_on_segment(&pt, &p1, &p2, &pt_projected);
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/* But X and Y we want the ones of the input point,
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* as on some architectures the interpolation math moves the
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* coordinates (see #3422)
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*/
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pt_projected.x = pt.x;
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pt_projected.y = pt.y;
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LWDEBUGF(3, "Projected point:(%g %g), seg:%d, p1:(%g %g), p2:(%g %g)", pt_projected.x, pt_projected.y, seg, p1.x, p1.y, p2.x, p2.y);
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/* When closest point == an endpoint, this is a boundary intersection */
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if ( ( (seg == nsegs-1) && p4d_same(&pt_projected, &p2) ) ||
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( (seg == 0) && p4d_same(&pt_projected, &p1) ) )
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{
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return 1;
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}
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/* This is an internal intersection, let's build the two new pointarrays */
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pa1 = ptarray_construct_empty(FLAGS_GET_Z(ipa->flags), FLAGS_GET_M(ipa->flags), seg+2);
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/* TODO: replace with a memcpy ? */
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for (i=0; i<=seg; ++i)
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{
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getPoint4d_p(ipa, i, &p1);
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ptarray_append_point(pa1, &p1, LW_FALSE);
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}
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ptarray_append_point(pa1, &pt_projected, LW_FALSE);
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pa2 = ptarray_construct_empty(FLAGS_GET_Z(ipa->flags), FLAGS_GET_M(ipa->flags), ipa->npoints-seg);
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ptarray_append_point(pa2, &pt_projected, LW_FALSE);
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/* TODO: replace with a memcpy (if so need to check for duplicated point) ? */
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for (i=seg+1; i<ipa->npoints; ++i)
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{
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getPoint4d_p(ipa, i, &p1);
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ptarray_append_point(pa2, &p1, LW_FALSE);
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}
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/* NOTE: I've seen empty pointarrays with loc != 0 and loc != 1 */
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if ( pa1->npoints == 0 || pa2->npoints == 0 ) {
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ptarray_free(pa1);
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ptarray_free(pa2);
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/* Intersection is on the boundary */
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return 1;
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}
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lwmline_add_lwline(v, lwline_construct(SRID_UNKNOWN, NULL, pa1));
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lwmline_add_lwline(v, lwline_construct(SRID_UNKNOWN, NULL, pa2));
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return 2;
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}
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static LWGEOM*
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lwline_split(const LWLINE* lwline_in, const LWGEOM* blade_in)
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{
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switch (blade_in->type)
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{
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case POINTTYPE:
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return lwline_split_by_point(lwline_in, (LWPOINT*)blade_in);
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case MULTIPOINTTYPE:
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return lwline_split_by_mpoint(lwline_in, (LWMPOINT*)blade_in);
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case LINETYPE:
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case MULTILINETYPE:
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case POLYGONTYPE:
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case MULTIPOLYGONTYPE:
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return lwline_split_by_line(lwline_in, blade_in);
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default:
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lwerror("Splitting a Line by a %s is unsupported",
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lwtype_name(blade_in->type));
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return NULL;
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}
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return NULL;
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}
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/* Initializes and uses GEOS internally */
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static LWGEOM*
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lwpoly_split_by_line(const LWPOLY* lwpoly_in, const LWGEOM* blade_in)
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{
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LWCOLLECTION* out;
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GEOSGeometry* g1;
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GEOSGeometry* g2;
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GEOSGeometry* g1_bounds;
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GEOSGeometry* polygons;
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const GEOSGeometry *vgeoms[1];
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int i,n;
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int hasZ = FLAGS_GET_Z(lwpoly_in->flags);
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/* Possible outcomes:
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*
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* 1. The line does not split the polygon
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* -> Return a collection with single element
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* 2. The line does split the polygon
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* -> Return a collection of all elements resulting from the split
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*/
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initGEOS(lwgeom_geos_error, lwgeom_geos_error);
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g1 = LWGEOM2GEOS((LWGEOM*)lwpoly_in, 0);
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if ( NULL == g1 )
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{
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lwerror("LWGEOM2GEOS: %s", lwgeom_geos_errmsg);
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return NULL;
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}
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g1_bounds = GEOSBoundary(g1);
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if ( NULL == g1_bounds )
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{
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GEOSGeom_destroy(g1);
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lwerror("GEOSBoundary: %s", lwgeom_geos_errmsg);
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return NULL;
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}
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g2 = LWGEOM2GEOS(blade_in, 0);
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if ( NULL == g2 )
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{
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GEOSGeom_destroy(g1);
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GEOSGeom_destroy(g1_bounds);
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lwerror("LWGEOM2GEOS: %s", lwgeom_geos_errmsg);
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return NULL;
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}
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vgeoms[0] = GEOSUnion(g1_bounds, g2);
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if ( NULL == vgeoms[0] )
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{
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GEOSGeom_destroy(g1);
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GEOSGeom_destroy(g2);
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GEOSGeom_destroy(g1_bounds);
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lwerror("GEOSUnion: %s", lwgeom_geos_errmsg);
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return NULL;
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}
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polygons = GEOSPolygonize(vgeoms, 1);
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if ( NULL == polygons )
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{
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GEOSGeom_destroy(g1);
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GEOSGeom_destroy(g2);
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GEOSGeom_destroy(g1_bounds);
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GEOSGeom_destroy((GEOSGeometry*)vgeoms[0]);
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lwerror("GEOSPolygonize: %s", lwgeom_geos_errmsg);
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return NULL;
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}
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#if PARANOIA_LEVEL > 0
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if ( GEOSGeomTypeId(polygons) != COLLECTIONTYPE )
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{
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GEOSGeom_destroy(g1);
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GEOSGeom_destroy(g2);
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GEOSGeom_destroy(g1_bounds);
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GEOSGeom_destroy((GEOSGeometry*)vgeoms[0]);
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GEOSGeom_destroy(polygons);
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lwerror("%s [%s] Unexpected return from GEOSpolygonize", __FILE__, __LINE__);
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return 0;
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}
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#endif
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/* We should now have all polygons, just skip
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* the ones which are in holes of the original
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* geometries and return the rest in a collection
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*/
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n = GEOSGetNumGeometries(polygons);
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out = lwcollection_construct_empty(COLLECTIONTYPE, lwpoly_in->srid,
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hasZ, 0);
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/* Allocate space for all polys */
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out->geoms = lwrealloc(out->geoms, sizeof(LWGEOM*)*n);
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assert(0 == out->ngeoms);
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for (i=0; i<n; ++i)
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{
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GEOSGeometry* pos; /* point on surface */
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const GEOSGeometry* p = GEOSGetGeometryN(polygons, i);
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int contains;
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pos = GEOSPointOnSurface(p);
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if ( ! pos )
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{
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GEOSGeom_destroy(g1);
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GEOSGeom_destroy(g2);
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GEOSGeom_destroy(g1_bounds);
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GEOSGeom_destroy((GEOSGeometry*)vgeoms[0]);
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GEOSGeom_destroy(polygons);
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lwerror("GEOSPointOnSurface: %s", lwgeom_geos_errmsg);
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return NULL;
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}
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contains = GEOSContains(g1, pos);
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if ( 2 == contains )
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{
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GEOSGeom_destroy(g1);
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GEOSGeom_destroy(g2);
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GEOSGeom_destroy(g1_bounds);
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GEOSGeom_destroy((GEOSGeometry*)vgeoms[0]);
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GEOSGeom_destroy(polygons);
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GEOSGeom_destroy(pos);
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lwerror("GEOSContains: %s", lwgeom_geos_errmsg);
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return NULL;
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}
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GEOSGeom_destroy(pos);
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if ( 0 == contains )
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{
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/* Original geometry doesn't contain
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* a point in this ring, must be an hole
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*/
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continue;
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}
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out->geoms[out->ngeoms++] = GEOS2LWGEOM(p, hasZ);
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}
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GEOSGeom_destroy(g1);
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GEOSGeom_destroy(g2);
|
|
GEOSGeom_destroy(g1_bounds);
|
|
GEOSGeom_destroy((GEOSGeometry*)vgeoms[0]);
|
|
GEOSGeom_destroy(polygons);
|
|
|
|
return (LWGEOM*)out;
|
|
}
|
|
|
|
static LWGEOM*
|
|
lwcollection_split(const LWCOLLECTION* lwcoll_in, const LWGEOM* blade_in)
|
|
{
|
|
LWGEOM** split_vector=NULL;
|
|
LWCOLLECTION* out;
|
|
size_t split_vector_capacity;
|
|
size_t split_vector_size=0;
|
|
size_t i,j;
|
|
|
|
split_vector_capacity=8;
|
|
split_vector = lwalloc(split_vector_capacity * sizeof(LWGEOM*));
|
|
if ( ! split_vector )
|
|
{
|
|
lwerror("Out of virtual memory");
|
|
return NULL;
|
|
}
|
|
|
|
for (i=0; i<lwcoll_in->ngeoms; ++i)
|
|
{
|
|
LWCOLLECTION* col;
|
|
LWGEOM* split = lwgeom_split(lwcoll_in->geoms[i], blade_in);
|
|
/* an exception should prevent this from ever returning NULL */
|
|
if ( ! split ) return NULL;
|
|
|
|
col = lwgeom_as_lwcollection(split);
|
|
/* Output, if any, will always be a collection */
|
|
assert(col);
|
|
|
|
/* Reallocate split_vector if needed */
|
|
if ( split_vector_size + col->ngeoms > split_vector_capacity )
|
|
{
|
|
/* NOTE: we could be smarter on reallocations here */
|
|
split_vector_capacity += col->ngeoms;
|
|
split_vector = lwrealloc(split_vector,
|
|
split_vector_capacity * sizeof(LWGEOM*));
|
|
if ( ! split_vector )
|
|
{
|
|
lwerror("Out of virtual memory");
|
|
return NULL;
|
|
}
|
|
}
|
|
|
|
for (j=0; j<col->ngeoms; ++j)
|
|
{
|
|
col->geoms[j]->srid = SRID_UNKNOWN; /* strip srid */
|
|
split_vector[split_vector_size++] = col->geoms[j];
|
|
}
|
|
lwfree(col->geoms);
|
|
lwfree(col);
|
|
}
|
|
|
|
/* Now split_vector has split_vector_size geometries */
|
|
out = lwcollection_construct(COLLECTIONTYPE, lwcoll_in->srid,
|
|
NULL, split_vector_size, split_vector);
|
|
|
|
return (LWGEOM*)out;
|
|
}
|
|
|
|
static LWGEOM*
|
|
lwpoly_split(const LWPOLY* lwpoly_in, const LWGEOM* blade_in)
|
|
{
|
|
switch (blade_in->type)
|
|
{
|
|
case MULTILINETYPE:
|
|
case LINETYPE:
|
|
return lwpoly_split_by_line(lwpoly_in, blade_in);
|
|
default:
|
|
lwerror("Splitting a Polygon by a %s is unsupported",
|
|
lwtype_name(blade_in->type));
|
|
return NULL;
|
|
}
|
|
return NULL;
|
|
}
|
|
|
|
/* exported */
|
|
LWGEOM*
|
|
lwgeom_split(const LWGEOM* lwgeom_in, const LWGEOM* blade_in)
|
|
{
|
|
switch (lwgeom_in->type)
|
|
{
|
|
case LINETYPE:
|
|
return lwline_split((const LWLINE*)lwgeom_in, blade_in);
|
|
|
|
case POLYGONTYPE:
|
|
return lwpoly_split((const LWPOLY*)lwgeom_in, blade_in);
|
|
|
|
case MULTIPOLYGONTYPE:
|
|
case MULTILINETYPE:
|
|
case COLLECTIONTYPE:
|
|
return lwcollection_split((const LWCOLLECTION*)lwgeom_in, blade_in);
|
|
|
|
default:
|
|
lwerror("Splitting of %s geometries is unsupported",
|
|
lwtype_name(lwgeom_in->type));
|
|
return NULL;
|
|
}
|
|
|
|
}
|
|
|