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qgscentralpointpositionmanager.h
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1 /***************************************************************************
2  qgscentralpointpositionmanager.h - description
3  --------------------------------
4  begin : January 2007
5  copyright : (C) 2007 by Marco Hugentobler
6  email : marco dot hugentobler at karto dot baug dot ethz dot ch
7  ***************************************************************************/
8 
9 /***************************************************************************
10  * *
11  * This program is free software; you can redistribute it and/or modify *
12  * it under the terms of the GNU General Public License as published by *
13  * the Free Software Foundation; either version 2 of the License, or *
14  * (at your option) any later version. *
15  * *
16  ***************************************************************************/
17 
18 #ifndef QGSCENTRALPOINTPOSITIONMANAGER
19 #define QGSCENTRALPOINTPOSITIONMANAGER
20 
22 #include "qgsrendercontext.h"
23 
24 class QgsPoint;
25 
31 {
32  public:
35  void addLayer( QgsVectorLayer* vl, QList<QgsVectorOverlay*>& overlays );
37  void removeLayers();
38  void findObjectPositions( const QgsRenderContext& context, QGis::UnitType unitType );
39 
40  private:
42  int findObjectPosition( const unsigned char* wkb, QgsPoint& position ) const;
45  int calculatePolygonCentroid( double x[], double y[], int numberOfPoints, double& centroidX, double& centroidY ) const;
46 
48  QList<QgsVectorOverlay*> mOverlays;
49 };
50 
51 #endif