double QgsGCPCanvasItem::residualToScreenFactor() const
{
if ( !mMapCanvas )
{
return 1;
}
double mapUnitsPerScreenPixel = mMapCanvas->mapUnitsPerPixel();
double mapUnitsPerRasterPixel = 1.0;
QList<QgsMapLayer*> canvasLayers = mMapCanvas->mapSettings().layers();
if ( !canvasLayers.isEmpty() )
{
QgsMapLayer* mapLayer = canvasLayers.at( 0 );
if ( mapLayer )
{
QgsRasterLayer* rasterLayer = dynamic_cast<QgsRasterLayer*>( mapLayer );
if ( rasterLayer )
{
mapUnitsPerRasterPixel = rasterLayer->rasterUnitsPerPixelX();
}
}
}
return 1.0 / ( mapUnitsPerScreenPixel * mapUnitsPerRasterPixel );
}
bool QgsReclassifyAlgorithmBase::prepareAlgorithm( const QVariantMap ¶meters, QgsProcessingContext &context, QgsProcessingFeedback *feedback )
{
mDataType = QgsRasterAnalysisUtils::rasterTypeChoiceToDataType( parameterAsEnum( parameters, QStringLiteral( "DATA_TYPE" ), context ) );
QgsRasterLayer *layer = parameterAsRasterLayer( parameters, QStringLiteral( "INPUT_RASTER" ), context );
if ( !layer )
throw QgsProcessingException( invalidRasterError( parameters, QStringLiteral( "INPUT_RASTER" ) ) );
mBand = parameterAsInt( parameters, QStringLiteral( "RASTER_BAND" ), context );
if ( mBand < 1 || mBand > layer->bandCount() )
throw QgsProcessingException( QObject::tr( "Invalid band number for RASTER_BAND (%1): Valid values for input raster are 1 to %2" ).arg( mBand )
.arg( layer->bandCount() ) );
mInterface.reset( layer->dataProvider()->clone() );
mExtent = layer->extent();
mCrs = layer->crs();
mRasterUnitsPerPixelX = std::abs( layer->rasterUnitsPerPixelX() );
mRasterUnitsPerPixelY = std::abs( layer->rasterUnitsPerPixelY() );
mNbCellsXProvider = mInterface->xSize();
mNbCellsYProvider = mInterface->ySize();
mNoDataValue = parameterAsDouble( parameters, QStringLiteral( "NO_DATA" ), context );
mUseNoDataForMissingValues = parameterAsBool( parameters, QStringLiteral( "NODATA_FOR_MISSING" ), context );
int boundsType = parameterAsEnum( parameters, QStringLiteral( "RANGE_BOUNDARIES" ), context );
switch ( boundsType )
{
case 0:
mBoundsType = QgsReclassifyUtils::RasterClass::IncludeMax;
break;
case 1:
mBoundsType = QgsReclassifyUtils::RasterClass::IncludeMin;
break;
case 2:
mBoundsType = QgsReclassifyUtils::RasterClass::IncludeMinAndMax;
break;
case 3:
mBoundsType = QgsReclassifyUtils::RasterClass::Exclusive;
break;
}
return _prepareAlgorithm( parameters, context, feedback );
}
bool QgsZonalHistogramAlgorithm::prepareAlgorithm( const QVariantMap ¶meters, QgsProcessingContext &context, QgsProcessingFeedback * )
{
QgsRasterLayer *layer = parameterAsRasterLayer( parameters, QStringLiteral( "INPUT_RASTER" ), context );
if ( !layer )
throw QgsProcessingException( invalidRasterError( parameters, QStringLiteral( "INPUT_RASTER" ) ) );
mRasterBand = parameterAsInt( parameters, QStringLiteral( "RASTER_BAND" ), context );
mHasNoDataValue = layer->dataProvider()->sourceHasNoDataValue( mRasterBand );
mNodataValue = layer->dataProvider()->sourceNoDataValue( mRasterBand );
mRasterInterface.reset( layer->dataProvider()->clone() );
mRasterExtent = layer->extent();
mCrs = layer->crs();
mCellSizeX = std::abs( layer->rasterUnitsPerPixelX() );
mCellSizeY = std::abs( layer->rasterUnitsPerPixelX() );
mNbCellsXProvider = mRasterInterface->xSize();
mNbCellsYProvider = mRasterInterface->ySize();
return true;
}
