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qgsdiagramfactory.cpp
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qgsdiagramfactory.cpp
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/***************************************************************************
qgsdiagramfactory.cpp - description
---------------------
begin : November 2008
copyright : (C) 2008 by Marco Hugentobler
email : marco dot hugentobler at karto dot baug dot ethz 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. *
* *
***************************************************************************/
#include <QDomNode>
#include "qgsdiagramfactory.h"
#include "qgsrendercontext.h"
QgsDiagramFactory::QgsDiagramFactory(): mSizeUnit( MM )
{
}
QgsDiagramFactory::~QgsDiagramFactory()
{
}
QgsDiagramFactory::SizeType QgsDiagramFactory::sizeType() const
{
return QgsDiagramFactory::HEIGHT;
}
double QgsDiagramFactory::diagramSizeScaleFactor( const QgsRenderContext& context ) const
{
if ( mSizeUnit == MM )
{
return context.scaleFactor();
}
else if ( mSizeUnit == MapUnits )
{
return 1 / context.mapToPixel().mapUnitsPerPixel(); //pixel based devices
}
return 1.0;
}
bool QgsDiagramFactory::writeSizeUnits( QDomElement& factoryElem, QDomDocument& doc ) const
{
if ( factoryElem.isNull() )
{
return false;
}
if ( mSizeUnit == MM )
{
factoryElem.setAttribute( "sizeUnits", "MM" );
}
else if ( mSizeUnit == MapUnits )
{
factoryElem.setAttribute( "sizeUnits", "MapUnits" );
}
return true;
}
bool QgsDiagramFactory::readSizeUnits( const QDomElement& factoryElem )
{
if ( factoryElem.isNull() )
{
return false;
}
QString unitString = factoryElem.attribute( "sizeUnits" );
if ( unitString == "MapUnits" )
{
mSizeUnit = MapUnits;
}
else
{
mSizeUnit = MM;
}
return true;
}