GEOS 3.4.2

- Main Page
- Related Pages
- Namespaces
- Classes
- Files

- File List

PolygonExtracter.h
1 /**********************************************************************
2 *
3 * GEOS - Geometry Engine Open Source
4 * http://geos.osgeo.org
5 *
6 * Copyright (C) 2001-2002 Vivid Solutions Inc.
7 * Copyright (C) 2006 Refractions Research Inc.
8 *
9 * This is free software; you can redistribute and/or modify it under
10 * the terms of the GNU Lesser General Public Licence as published
11 * by the Free Software Foundation.
12 * See the COPYING file for more information.
13 *
14 **********************************************************************/
15
16 #ifndef GEOS_GEOM_UTIL_POLYGONEXTRACTER_H
17 #define GEOS_GEOM_UTIL_POLYGONEXTRACTER_H
18
19 #include <geos/export.h>
20 #include <geos/geom/GeometryFilter.h>
21 #include <geos/geom/Polygon.h>
22 #include <geos/platform.h>
23 #include <vector>
24
25 namespace geos {
26 namespace geom { // geos.geom
27 namespace util { // geos.geom.util
28
32 class GEOS_DLL PolygonExtracter: public GeometryFilter {
33
34 public:
35
43 static void getPolygons(const Geometry &geom, std::vector<const Polygon*>& ret)
44 {
45 PolygonExtracter pe(ret);
46 geom.apply_ro(&pe);
47 }
48
53 PolygonExtracter(std::vector<const Polygon*>& newComps)
54 :
55 comps(newComps)
56 {}
57
58 void filter_rw(Geometry *geom) {
59 if ( const Polygon *p=dynamic_cast<const Polygon *>(geom) )
60 {
61 comps.push_back(p);
62 }
63 }
64
65 void filter_ro(const Geometry *geom)
66 {
67 if ( const Polygon *p=dynamic_cast<const Polygon *>(geom) )
68 {
69 comps.push_back(p);
70 }
71 }
72
73 private:
74
76 std::vector<const Polygon*>& comps;
77
78 // Declare type as noncopyable
79 PolygonExtracter(const PolygonExtracter& other);
80 PolygonExtracter& operator=(const PolygonExtracter& rhs);
81 };
82
83 } // namespace geos.geom.util
84 } // namespace geos.geom
85 } // namespace geos
86
87 #endif