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 <QObject>

#include "qgis_core.h"
#include "qgis_sip.h"

class QgsMapSettings;
class QgsMapLayer;
class QgsPointXY;

class CORE_EXPORT QgsTolerance
{
    Q_GADGET
  public:

    enum UnitType
    {
      LayerUnits,
      Pixels,
      ProjectUnits
    };
    Q_ENUM( UnitType );

    static double vertexSearchRadius( const QgsMapSettings &mapSettings );

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

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

    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 );

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

};

#endif