QGIS API Documentation 3.37.0-Master (c2d15952569)
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util.cpp
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1/*
2 * libpal - Automated Placement of Labels Library
3 *
4 * Copyright (C) 2008 Maxence Laurent, MIS-TIC, HEIG-VD
5 * University of Applied Sciences, Western Switzerland
6 * http://www.hes-so.ch
7 *
8 * Contact:
9 * maxence.laurent <at> heig-vd <dot> ch
10 * or
11 * eric.taillard <at> heig-vd <dot> ch
12 *
13 * This file is part of libpal.
14 *
15 * libpal is free software: you can redistribute it and/or modify
16 * it under the terms of the GNU General Public License as published by
17 * the Free Software Foundation, either version 3 of the License, or
18 * (at your option) any later version.
19 *
20 * libpal is distributed in the hope that it will be useful,
21 * but WITHOUT ANY WARRANTY; without even the implied warranty of
22 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
23 * GNU General Public License for more details.
24 *
25 * You should have received a copy of the GNU General Public License
26 * along with libpal. If not, see <http://www.gnu.org/licenses/>.
27 *
28 */
29
30#include "qgsgeos.h"
31#include "util.h"
32
33#include "qgslogger.h"
34#include <cfloat>
35
36QLinkedList<const GEOSGeometry *> *pal::Util::unmulti( const GEOSGeometry *the_geom )
37{
38 QLinkedList<const GEOSGeometry *> *queue = new QLinkedList<const GEOSGeometry *>;
39 QLinkedList<const GEOSGeometry *> *final_queue = new QLinkedList<const GEOSGeometry *>;
40
41 const GEOSGeometry *geom = nullptr;
42
43 queue->append( the_geom );
44 int nGeom;
45 int i;
46
47 GEOSContextHandle_t geosctxt = QgsGeos::getGEOSHandler();
48
49 while ( !queue->isEmpty() )
50 {
51 geom = queue->takeFirst();
52 const int type = GEOSGeomTypeId_r( geosctxt, geom );
53 switch ( type )
54 {
55 case GEOS_MULTIPOINT:
56 case GEOS_MULTILINESTRING:
57 case GEOS_MULTIPOLYGON:
58 case GEOS_GEOMETRYCOLLECTION:
59 nGeom = GEOSGetNumGeometries_r( geosctxt, geom );
60 for ( i = 0; i < nGeom; i++ )
61 {
62 queue->append( GEOSGetGeometryN_r( geosctxt, geom, i ) );
63 }
64 break;
65 case GEOS_POINT:
66 case GEOS_LINESTRING:
67 case GEOS_POLYGON:
68 final_queue->append( geom );
69 break;
70 default:
71 QgsDebugError( QStringLiteral( "unexpected geometry type:%1" ).arg( type ) );
72 delete final_queue;
73 delete queue;
74 return nullptr;
75 }
76 }
77 delete queue;
78
79 return final_queue;
80}
81
82
83
static GEOSContextHandle_t getGEOSHandler()
Definition qgsgeos.cpp:3586
static QLinkedList< const GEOSGeometry * > * unmulti(const GEOSGeometry *the_geom)
Definition util.cpp:36
#define QgsDebugError(str)
Definition qgslogger.h:38
struct GEOSGeom_t GEOSGeometry
Definition util.h:41