qgstolerance.h

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/***************************************************************************
    qgstolerance.h  -  wrapper for tolerance handling
    ----------------------
    begin                : March 2009
    copyright            : (C) 2009 by Richard Kostecky
    email                : csf.kostej at gmail dot com
 ***************************************************************************
 *                                                                         *
 *   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 QGSTOLERANCE_H
#define QGSTOLERANCE_H
#include "qgsmaptopixel.h"
#include "qgsmaprenderer.h"
#include "qgsmaplayer.h"
#include "qgspoint.h"

class CORE_EXPORT QgsTolerance
{

  public:
    enum UnitType
    {
      MapUnits,
      Pixels
    };

    static double vertexSearchRadius( QgsMapLayer* layer, QgsMapRenderer* renderer );

    static double defaultTolerance( QgsMapLayer* layer, QgsMapRenderer* renderer );

    static double toleranceInMapUnits( double tolerance, QgsMapLayer* layer, QgsMapRenderer* renderer, UnitType units = MapUnits );

  private:
    static double computeMapUnitPerPixel( QgsMapLayer* layer, QgsMapRenderer* renderer );
    static QgsPoint toLayerCoordinates( QgsMapLayer* layer, QgsMapRenderer* renderer, const QPoint& point );

};

#endif