/usr/include/qgis/qgsscalecalculator.h is in libqgis-dev 1.7.4+1.7.5~20120320-1.1+b1.
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The actual contents of the file can be viewed below.
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qgsscalecalculator.h
Calculates scale based on map extent and units
-------------------
begin : May 18, 2004
copyright : (C) 2004 by Gary E.Sherman
email : sherman at mrcc.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. *
* *
***************************************************************************/
/* $Id$ */
#ifndef QGSSCALECALCULATOR_H
#define QGSSCALECALCULATOR_H
#include <qgis.h>
class QString;
class QgsRectangle;
/** \ingroup core
* Calculates scale for a given combination of canvas size, map extent,
* and monitor dpi.
*/
class CORE_EXPORT QgsScaleCalculator
{
public:
/**
* Constructor
* @param dpi Monitor resolution in dots per inch
* @param mapUnits Units of the data on the map. Must match a value from the
* QGis::UnitType enum (Meters, Feet, Degrees)
*/
QgsScaleCalculator( double dpi = 0,
QGis::UnitType mapUnits = QGis::Meters );
//! Destructor
~QgsScaleCalculator();
/**
* Set the dpi to be used in scale calculations
* @param dpi Dots per inch of monitor resolution
*/
void setDpi( double dpi );
/**
* Accessor for dpi used in scale calculations
* @return int the dpi used for scale calculations.
*/
double dpi();
/**
* Set the map units
* @param mapUnits Units of the data on the map. Must match a value from the
*/
void setMapUnits( QGis::UnitType mapUnits );
/** Returns current map units */
QGis::UnitType mapUnits() const;
/**
* Calculate the scale
* @param mapExtent QgsRectangle containing the current map extent
* @param canvasWidth Width of the map canvas in pixel (physical) units
* @return scale of current map view
*/
double calculate( const QgsRectangle &mapExtent, int canvasWidth );
/**
* Calculate the distance between two points in geographic coordinates.
* Used to calculate scale for map views with geographic (decimal degree)
* data.
* @param mapExtent QgsRectangle containing the current map extent
*/
double calculateGeographicDistance( const QgsRectangle &mapExtent );
private:
//! dpi member
double mDpi;
//! map unit member
QGis::UnitType mMapUnits;
};
#endif // #ifndef QGSSCALECALCULATOR_H
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