QGIS API Documentation 3.29.0-Master (ade4f0cf0f)
util.cpp
Go to the documentation of this file.
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 "layer.h"
31#include "internalexception.h"
32#include "util.h"
33#include "labelposition.h"
34#include "feature.h"
35#include "geomfunction.h"
36
37#include "qgslogger.h"
38#include <cfloat>
39
40QLinkedList<const GEOSGeometry *> *pal::Util::unmulti( const GEOSGeometry *the_geom )
41{
42 QLinkedList<const GEOSGeometry *> *queue = new QLinkedList<const GEOSGeometry *>;
43 QLinkedList<const GEOSGeometry *> *final_queue = new QLinkedList<const GEOSGeometry *>;
44
45 const GEOSGeometry *geom = nullptr;
46
47 queue->append( the_geom );
48 int nGeom;
49 int i;
50
51 GEOSContextHandle_t geosctxt = QgsGeos::getGEOSHandler();
52
53 while ( !queue->isEmpty() )
54 {
55 geom = queue->takeFirst();
56 const int type = GEOSGeomTypeId_r( geosctxt, geom );
57 switch ( type )
58 {
59 case GEOS_MULTIPOINT:
60 case GEOS_MULTILINESTRING:
61 case GEOS_MULTIPOLYGON:
62 case GEOS_GEOMETRYCOLLECTION:
63 nGeom = GEOSGetNumGeometries_r( geosctxt, geom );
64 for ( i = 0; i < nGeom; i++ )
65 {
66 queue->append( GEOSGetGeometryN_r( geosctxt, geom, i ) );
67 }
68 break;
69 case GEOS_POINT:
70 case GEOS_LINESTRING:
71 case GEOS_POLYGON:
72 final_queue->append( geom );
73 break;
74 default:
75 QgsDebugMsg( QStringLiteral( "unexpected geometry type:%1" ).arg( type ) );
76 delete final_queue;
77 delete queue;
78 return nullptr;
79 }
80 }
81 delete queue;
82
83 return final_queue;
84}
85
86
87
static GEOSContextHandle_t getGEOSHandler()
Definition: qgsgeos.cpp:3446
static QLinkedList< const GEOSGeometry * > * unmulti(const GEOSGeometry *the_geom)
Definition: util.cpp:40
#define QgsDebugMsg(str)
Definition: qgslogger.h:38