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qgsdemterraingenerator.cpp
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qgsdemterraingenerator.cpp
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/***************************************************************************
qgsdemterraingenerator.cpp
--------------------------------------
Date : July 2017
Copyright : (C) 2017 by Martin Dobias
Email : wonder dot sk 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. *
* *
***************************************************************************/
#include "qgsdemterraingenerator.h"
#include "qgsdemterraintileloader_p.h"
#include "qgsrasterlayer.h"
QgsDemTerrainGenerator::~QgsDemTerrainGenerator()
{
delete mHeightMapGenerator;
}
void QgsDemTerrainGenerator::setLayer( QgsRasterLayer *layer )
{
mLayer = QgsMapLayerRef( layer );
updateGenerator();
}
QgsRasterLayer *QgsDemTerrainGenerator::layer() const
{
return qobject_cast<QgsRasterLayer *>( mLayer.layer.data() );
}
void QgsDemTerrainGenerator::setCrs( const QgsCoordinateReferenceSystem &crs, const QgsCoordinateTransformContext &context )
{
mCrs = crs;
mTransformContext = context;
updateGenerator();
}
QgsTerrainGenerator *QgsDemTerrainGenerator::clone() const
{
QgsDemTerrainGenerator *cloned = new QgsDemTerrainGenerator;
cloned->mCrs = mCrs;
cloned->mLayer = mLayer;
cloned->mResolution = mResolution;
cloned->mSkirtHeight = mSkirtHeight;
cloned->updateGenerator();
return cloned;
}
QgsTerrainGenerator::Type QgsDemTerrainGenerator::type() const
{
return QgsTerrainGenerator::Dem;
}
QgsRectangle QgsDemTerrainGenerator::extent() const
{
return mTerrainTilingScheme.tileToExtent( 0, 0, 0 );
}
float QgsDemTerrainGenerator::heightAt( double x, double y, const Qgs3DMapSettings &map ) const
{
Q_UNUSED( map )
if ( mHeightMapGenerator )
return mHeightMapGenerator->heightAt( x, y );
else
return 0;
}
void QgsDemTerrainGenerator::writeXml( QDomElement &elem ) const
{
elem.setAttribute( QStringLiteral( "layer" ), mLayer.layerId );
elem.setAttribute( QStringLiteral( "resolution" ), mResolution );
elem.setAttribute( QStringLiteral( "skirt-height" ), mSkirtHeight );
// crs is not read/written - it should be the same as destination crs of the map
}
void QgsDemTerrainGenerator::readXml( const QDomElement &elem )
{
mLayer = QgsMapLayerRef( elem.attribute( QStringLiteral( "layer" ) ) );
mResolution = elem.attribute( QStringLiteral( "resolution" ) ).toInt();
mSkirtHeight = elem.attribute( QStringLiteral( "skirt-height" ) ).toFloat();
// crs is not read/written - it should be the same as destination crs of the map
}
void QgsDemTerrainGenerator::resolveReferences( const QgsProject &project )
{
mLayer = QgsMapLayerRef( project.mapLayer( mLayer.layerId ) );
updateGenerator();
}
QgsChunkLoader *QgsDemTerrainGenerator::createChunkLoader( QgsChunkNode *node ) const
{
return new QgsDemTerrainTileLoader( mTerrain, node );
}
void QgsDemTerrainGenerator::updateGenerator()
{
QgsRasterLayer *dem = layer();
if ( dem )
{
QgsRectangle te = dem->extent();
QgsCoordinateTransform terrainToMapTransform( dem->crs(), mCrs, mTransformContext );
te = terrainToMapTransform.transformBoundingBox( te );
mTerrainTilingScheme = QgsTilingScheme( te, mCrs );
delete mHeightMapGenerator;
mHeightMapGenerator = new QgsDemHeightMapGenerator( dem, mTerrainTilingScheme, mResolution, mTransformContext );
}
else
{
mTerrainTilingScheme = QgsTilingScheme();
delete mHeightMapGenerator;
mHeightMapGenerator = nullptr;
}
}