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,
      LayerUnits = MapUnits,
      Pixels,
      ProjectUnits
    };

    static double vertexSearchRadius( const QgsMapSettings& mapSettings );

    static double vertexSearchRadius( QgsMapLayer* layer, const QgsMapSettings& mapSettings );

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

    static double defaultTolerance( QgsMapLayer* layer, const QgsMapSettings& mapSettings );

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

    static double toleranceInProjectUnits( double tolerance, QgsMapLayer* layer, const QgsMapSettings& mapSettings, QgsTolerance::UnitType units );

    static double toleranceInMapUnits( double tolerance, QgsMapLayer* layer, const QgsMapSettings& mapSettings, UnitType units = LayerUnits );

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

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

};

#endif