/usr/include/qgis/qgscentralpointpositionmanager.h is in libqgis-dev 1.7.4+1.7.5~20120320-1.1+b1.
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qgscentralpointpositionmanager.h - description
--------------------------------
begin : January 2007
copyright : (C) 2007 by Marco Hugentobler
email : marco dot hugentobler at karto dot baug dot ethz dot ch
***************************************************************************/
/***************************************************************************
* *
* This program is free software; you can redistribute it and/or modify *
* it under the terms of the GNU General Public License as published by *
* the Free Software Foundation; either version 2 of the License, or *
* (at your option) any later version. *
* *
***************************************************************************/
#ifndef QGSCENTRALPOINTPOSITIONMANAGER
#define QGSCENTRALPOINTPOSITIONMANAGER
#include "qgsoverlayobjectpositionmanager.h"
#include "qgsrendercontext.h"
class QgsPoint;
/**A simple position manager implementation which positions the overlay objects on the center point of
a feature. It does not consider conflicts in case of several overlay layers
* \note This class has been added in version 1.1
*/
class QgsCentralPointPositionManager: public QgsOverlayObjectPositionManager
{
public:
QgsCentralPointPositionManager();
~QgsCentralPointPositionManager();
void addLayer( QgsVectorLayer* vl, QList<QgsVectorOverlay*>& overlays );
/**Removes all the overlays*/
void removeLayers();
void findObjectPositions( const QgsRenderContext& context, QGis::UnitType unitType );
private:
/**Calculates the central point for points/lines/polygons. Returns 0 in case of success*/
int findObjectPosition( const unsigned char* wkb, QgsPoint& position ) const;
/**Calculates the polygon centroid with the algorithm from Graphics gems IV: Centroid of a polygon.
@return 0 in case of success*/
int calculatePolygonCentroid( double x[], double y[], int numberOfPoints, double& centroidX, double& centroidY ) const;
/**Stores all the overlay objects to retrieve all objects when positioning*/
QList<QgsVectorOverlay*> mOverlays;
};
#endif
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