qgsmapunitscale.h

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/***************************************************************************
  qgsmapunitscale.h
  Struct for storing maximum and minimum scales for measurements in map units
  -------------------
   begin                : April 2014
   copyright            : (C) Sandro Mani
   email                : smani at sourcepole 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 QGSMAPUNITSCALE_H
#define QGSMAPUNITSCALE_H
 
#include "qgis.h"
#include "qgis_core.h"
 
class QgsRenderContext;

 
class CORE_EXPORT QgsMapUnitScale
{
  public:
    explicit QgsMapUnitScale( double minScale = 0.0, double maxScale = 0.0 )
      : minScale( minScale )
      , maxScale( maxScale )
    {}

    bool isNull() const;

    double minScale;

    double maxScale;

    bool minSizeMMEnabled = false;
    double minSizeMM = 0.0;
    bool maxSizeMMEnabled = false;
    double maxSizeMM = 0.0;

    double computeMapUnitsPerPixel( const QgsRenderContext &c ) const;
 
    bool operator==( const QgsMapUnitScale &other ) const
    {
      return qgsDoubleNear( minScale, other.minScale )
             && qgsDoubleNear( maxScale, other.maxScale )
             && minSizeMMEnabled == other.minSizeMMEnabled
             && qgsDoubleNear( minSizeMM, other.minSizeMM )
             && maxSizeMMEnabled == other.maxSizeMMEnabled
             && qgsDoubleNear( maxSizeMM, other.maxSizeMM );
    }
 
    bool operator!=( const QgsMapUnitScale &other ) const { return !operator==( other ); }
};
 
 
#endif // QGSMAPUNITSCALE_H