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qgsquickmaptransform.cpp
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qgsquickmaptransform.cpp
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/***************************************************************************
qgsquickmaptransform.cpp
--------------------------------------
Date : 27.12.2014
Copyright : (C) 2014 by Matthias Kuhn
Email : matthias (at) opengis.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 "qgsquickmaptransform.h"
#include "qgsquickmapsettings.h"
void QgsQuickMapTransform::applyTo( QMatrix4x4 *matrix ) const
{
*matrix *= mMatrix;
matrix->optimize();
}
QgsQuickMapSettings *QgsQuickMapTransform::mapSettings() const
{
return mMapSettings;
}
void QgsQuickMapTransform::setMapSettings( QgsQuickMapSettings *mapSettings )
{
if ( mapSettings == mMapSettings )
return;
if ( mMapSettings )
disconnect( mMapSettings, &QgsQuickMapSettings::visibleExtentChanged, this, &QgsQuickMapTransform::updateMatrix );
mMapSettings = mapSettings;
if ( mMapSettings )
connect( mMapSettings, &QgsQuickMapSettings::visibleExtentChanged, this, &QgsQuickMapTransform::updateMatrix );
updateMatrix();
emit mapSettingsChanged();
}
void QgsQuickMapTransform::updateMatrix()
{
QMatrix4x4 matrix;
float scaleFactor = static_cast<float>( ( 1.0 / mMapSettings->mapUnitsPerPixel() ) / mMapSettings->devicePixelRatio() );
matrix.scale( scaleFactor, -scaleFactor );
matrix.translate( static_cast<float>( -mMapSettings->visibleExtent().xMinimum( ) ),
static_cast<float>( -mMapSettings->visibleExtent().yMaximum() ) );
mMatrix = matrix;
update();
}