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qgsalgorithmwritevectortiles.cpp
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qgsalgorithmwritevectortiles.cpp
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/***************************************************************************
qgsalgorithmwritevectortiles.h
---------------------
Date : April 2020
Copyright : (C) 2020 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 "qgsalgorithmwritevectortiles.h"
#include "qgsprocessingparametervectortilewriterlayers.h"
#include "qgsvectorlayer.h"
#include "qgsvectortilewriter.h"
#include <QUrl>
///@cond PRIVATE
QString QgsWriteVectorTilesBaseAlgorithm::group() const
{
return QObject::tr( "Vector tiles" );
}
QString QgsWriteVectorTilesBaseAlgorithm::groupId() const
{
return QStringLiteral( "vectortiles" );
}
QString QgsWriteVectorTilesBaseAlgorithm::shortHelpString() const
{
return QObject::tr( "This algorithm exports one or more vector layers to vector tiles - a data format optimized for fast map rendering and small data size." );
}
void QgsWriteVectorTilesBaseAlgorithm::addBaseParameters()
{
addParameter( new QgsProcessingParameterVectorTileWriterLayers( QStringLiteral( "LAYERS" ), QObject::tr( "Input layers" ) ) );
addParameter( new QgsProcessingParameterNumber( QStringLiteral( "MIN_ZOOM" ), QObject::tr( "Minimum zoom level" ), QgsProcessingParameterNumber::Integer, 0, false, 0, 24 ) );
addParameter( new QgsProcessingParameterNumber( QStringLiteral( "MAX_ZOOM" ), QObject::tr( "Maximum zoom level" ), QgsProcessingParameterNumber::Integer, 3, false, 0, 24 ) );
// optional extent
addParameter( new QgsProcessingParameterExtent( QStringLiteral( "EXTENT" ), QObject::tr( "Extent" ), QVariant(), true ) );
}
QVariantMap QgsWriteVectorTilesBaseAlgorithm::processAlgorithm( const QVariantMap ¶meters, QgsProcessingContext &context, QgsProcessingFeedback *feedback )
{
const int minZoom = parameterAsInt( parameters, QStringLiteral( "MIN_ZOOM" ), context );
const int maxZoom = parameterAsInt( parameters, QStringLiteral( "MAX_ZOOM" ), context );
const QVariant layersVariant = parameters.value( parameterDefinition( QStringLiteral( "LAYERS" ) )->name() );
const QList<QgsVectorTileWriter::Layer> layers = QgsProcessingParameterVectorTileWriterLayers::parameterAsLayers( layersVariant, context );
for ( const QgsVectorTileWriter::Layer &layer : layers )
{
if ( !layer.layer() )
throw QgsProcessingException( QObject::tr( "Unknown input layer" ) );
}
QgsVectorTileWriter writer;
QVariantMap outputs;
prepareWriter( writer, parameters, context, outputs );
writer.setMinZoom( minZoom );
writer.setMaxZoom( maxZoom );
writer.setLayers( layers );
writer.setTransformContext( context.transformContext() );
if ( parameters.contains( QStringLiteral( "EXTENT" ) ) )
{
const QgsRectangle extent = parameterAsExtent( parameters, QStringLiteral( "EXTENT" ), context, QgsCoordinateReferenceSystem( "EPSG:3857" ) );
writer.setExtent( extent );
}
const bool res = writer.writeTiles( feedback );
if ( !res )
throw QgsProcessingException( QObject::tr( "Failed to write vector tiles: " ) + writer.errorMessage() );
return outputs;
}
//
// QgsWriteVectorTilesXyzAlgorithm
//
QString QgsWriteVectorTilesXyzAlgorithm::name() const
{
return QStringLiteral( "writevectortiles_xyz" );
}
QString QgsWriteVectorTilesXyzAlgorithm::displayName() const
{
return QObject::tr( "Write Vector Tiles (XYZ)" );
}
QgsProcessingAlgorithm *QgsWriteVectorTilesXyzAlgorithm::createInstance() const
{
return new QgsWriteVectorTilesXyzAlgorithm();
}
void QgsWriteVectorTilesXyzAlgorithm::initAlgorithm( const QVariantMap & )
{
addParameter( new QgsProcessingParameterFolderDestination( QStringLiteral( "OUTPUT_DIRECTORY" ), QObject::tr( "Output directory" ) ) );
addParameter( new QgsProcessingParameterString( QStringLiteral( "XYZ_TEMPLATE" ), QObject::tr( "File template" ), QStringLiteral( "{z}/{x}/{y}.pbf" ) ) );
addBaseParameters();
}
void QgsWriteVectorTilesXyzAlgorithm::prepareWriter( QgsVectorTileWriter &writer, const QVariantMap ¶meters, QgsProcessingContext &context, QVariantMap &outputs )
{
const QString outputDir = parameterAsString( parameters, QStringLiteral( "OUTPUT_DIRECTORY" ), context );
const QString xyzTemplate = parameterAsString( parameters, QStringLiteral( "XYZ_TEMPLATE" ), context );
QgsDataSourceUri dsUri;
dsUri.setParam( QStringLiteral( "type" ), QStringLiteral( "xyz" ) );
dsUri.setParam( QStringLiteral( "url" ), QUrl::fromLocalFile( outputDir + "/" + xyzTemplate ).toString() );
const QString uri = dsUri.encodedUri();
writer.setDestinationUri( uri );
outputs.insert( QStringLiteral( "OUTPUT_DIRECTORY" ), outputDir );
}
//
// QgsWriteVectorTilesMbtilesAlgorithm
//
QString QgsWriteVectorTilesMbtilesAlgorithm::name() const
{
return QStringLiteral( "writevectortiles_mbtiles" );
}
QString QgsWriteVectorTilesMbtilesAlgorithm::displayName() const
{
return QObject::tr( "Write Vector Tiles (MBTiles)" );
}
QgsProcessingAlgorithm *QgsWriteVectorTilesMbtilesAlgorithm::createInstance() const
{
return new QgsWriteVectorTilesMbtilesAlgorithm();
}
void QgsWriteVectorTilesMbtilesAlgorithm::initAlgorithm( const QVariantMap & )
{
addParameter( new QgsProcessingParameterFileDestination( QStringLiteral( "OUTPUT" ), QObject::tr( "Destination MBTiles" ), QObject::tr( "MBTiles files (*.mbtiles)" ) ) );
addBaseParameters();
// optional metadata for MBTiles
addParameter( new QgsProcessingParameterString( QStringLiteral( "META_NAME" ), QObject::tr( "Metadata: Name" ), QVariant(), false, true ) );
addParameter( new QgsProcessingParameterString( QStringLiteral( "META_DESCRIPTION" ), QObject::tr( "Metadata: Description" ), QVariant(), false, true ) );
addParameter( new QgsProcessingParameterString( QStringLiteral( "META_ATTRIBUTION" ), QObject::tr( "Metadata: Attribution" ), QVariant(), false, true ) );
addParameter( new QgsProcessingParameterString( QStringLiteral( "META_VERSION" ), QObject::tr( "Metadata: Version" ), QVariant(), false, true ) );
std::unique_ptr< QgsProcessingParameterString > metaTypeParam = std::make_unique< QgsProcessingParameterString >( QStringLiteral( "META_TYPE" ), QObject::tr( "Metadata: Type" ), QVariant(), false, true );
metaTypeParam->setMetadata( {{
QStringLiteral( "widget_wrapper" ), QVariantMap(
{{QStringLiteral( "value_hints" ), QStringList() << QStringLiteral( "overlay" ) << QStringLiteral( "baselayer" ) }}
)
}
} );
addParameter( metaTypeParam.release() );
addParameter( new QgsProcessingParameterString( QStringLiteral( "META_CENTER" ), QObject::tr( "Metadata: Center" ), QVariant(), false, true ) );
}
void QgsWriteVectorTilesMbtilesAlgorithm::prepareWriter( QgsVectorTileWriter &writer, const QVariantMap ¶meters, QgsProcessingContext &context, QVariantMap &outputs )
{
const QString outputFile = parameterAsFileOutput( parameters, QStringLiteral( "OUTPUT" ), context );
QgsDataSourceUri dsUri;
dsUri.setParam( QStringLiteral( "type" ), QStringLiteral( "mbtiles" ) );
dsUri.setParam( QStringLiteral( "url" ), outputFile );
const QString uri = dsUri.encodedUri();
writer.setDestinationUri( uri );
const QString metaName = parameterAsString( parameters, QStringLiteral( "META_NAME" ), context );
const QString metaDesciption = parameterAsString( parameters, QStringLiteral( "META_DESCRIPTION" ), context );
const QString metaAttribution = parameterAsString( parameters, QStringLiteral( "META_ATTRIBUTION" ), context );
const QString metaVersion = parameterAsString( parameters, QStringLiteral( "META_VERSION" ), context );
const QString metaType = parameterAsString( parameters, QStringLiteral( "META_TYPE" ), context );
const QString metaCenter = parameterAsString( parameters, QStringLiteral( "META_CENTER" ), context );
QVariantMap meta;
if ( !metaName.isEmpty() )
meta["name"] = metaName;
if ( !metaDesciption.isEmpty() )
meta["description"] = metaDesciption;
if ( !metaAttribution.isEmpty() )
meta["attribution"] = metaAttribution;
if ( !metaVersion.isEmpty() )
meta["version"] = metaVersion;
if ( !metaType.isEmpty() )
meta["type"] = metaType;
if ( !metaCenter.isEmpty() )
meta["center"] = metaCenter;
writer.setMetadata( meta );
outputs.insert( QStringLiteral( "OUTPUT" ), outputFile );
}
///@endcond