/usr/include/qgis/qgsmapunitscale.h is in libqgis-dev 2.14.11+dfsg-3+deb9u1.
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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 <QtCore>
#include "qgsrendercontext.h"
/**
* \class QgsMapUnitScale
* \brief Struct for storing maximum and minimum scales for measurements in map units
*
* For measurements in map units, a minimum and a maximum scale can be defined.
* Outside this range, the measurements aren't scaled anymore proportionally to
* the map scale.
*/
class CORE_EXPORT QgsMapUnitScale
{
public:
/** Constructor for QgsMapUnitScale
* @param minScale minimum allowed scale, or 0.0 if no minimum scale set
* @param maxScale maximum allowed scale, or 0.0 if no maximum scale set
*/
QgsMapUnitScale( double minScale = 0.0, double maxScale = 0.0 )
: minScale( minScale )
, maxScale( maxScale )
, minSizeMMEnabled( false )
, minSizeMM( 0.0 )
, maxSizeMMEnabled( false )
, maxSizeMM( 0.0 )
{}
/** The minimum scale, or 0.0 if unset */
double minScale;
/** The maximum scale, or 0.0 if unset */
double maxScale;
/** Whether the minimum size in mm should be respected */
bool minSizeMMEnabled;
/** The minimum size in millimeters, or 0.0 if unset */
double minSizeMM;
/** Whether the maximum size in mm should be respected */
bool maxSizeMMEnabled;
/** The maximum size in millimeters, or 0.0 if unset */
double maxSizeMM;
/** Computes a map units per pixel scaling factor, respecting the minimum and maximum scales
* set for the object.
* @param c render context
* @returns map units per pixel, limited between minimum and maximum scales
*/
double computeMapUnitsPerPixel( const QgsRenderContext& c ) const
{
double mup = c.mapToPixel().mapUnitsPerPixel();
double renderScale = c.rendererScale(); // Note: this value is 1 / scale
if ( !qgsDoubleNear( minScale, 0 ) )
{
mup = qMin( mup / ( minScale * renderScale ), mup );
}
if ( !qgsDoubleNear( maxScale, 0 ) )
{
mup = qMax( mup / ( maxScale * renderScale ), mup );
}
return mup;
}
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
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