/usr/include/qgis/qgstolerance.h is in libqgis-dev 1.7.4+1.7.5~20120320-1.1+b1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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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"
/** \ingroup core
* This is the class is providing tolerance value in map unit values.
*
* \note This class has been added in version 1.1.
*/
class CORE_EXPORT QgsTolerance
{
public:
/**Type of unit of tolerance value from settings*/
enum UnitType
{
/**Map unit value*/
MapUnits,
/**Pixels unit of tolerance*/
Pixels
};
/**
* Static function to get vertex tolerance value for a layer.
* The value is read from settings and transformed if necessary.
* @return value of vertex tolerance in map units
*/
static double vertexSearchRadius( QgsMapLayer* layer, QgsMapRenderer* renderer );
/**
* Static function to get default tolerance value for a layer.
* The value is read from settings and transformed if necessary.
* @return value of default tolerance in map units
*/
static double defaultTolerance( QgsMapLayer* layer, QgsMapRenderer* renderer );
/**
* Static function to translate tolerance value into current map unit value
* @param tolerance tolerance value to be translated
* @param layer reference layer
* @param renderer renderer
* @param units type of units to be translated
* @return value of tolerance in map units
*/
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
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