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qgsvectortilelayer.cpp
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qgsvectortilelayer.cpp
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/***************************************************************************
qgsvectortilelayer.cpp
--------------------------------------
Date : March 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 "qgsvectortilelayer.h"
#include "qgslogger.h"
#include "qgsvectortilelayerrenderer.h"
#include "qgsmbtiles.h"
#include "qgsvectortilebasiclabeling.h"
#include "qgsvectortilebasicrenderer.h"
#include "qgsvectortilelabeling.h"
#include "qgsvectortileloader.h"
#include "qgsvectortileutils.h"
#include "qgsdatasourceuri.h"
QgsVectorTileLayer::QgsVectorTileLayer( const QString &uri, const QString &baseName )
: QgsMapLayer( QgsMapLayerType::VectorTileLayer, baseName )
{
mDataSource = uri;
mValid = loadDataSource();
// set a default renderer
QgsVectorTileBasicRenderer *renderer = new QgsVectorTileBasicRenderer;
renderer->setStyles( QgsVectorTileBasicRenderer::simpleStyleWithRandomColors() );
setRenderer( renderer );
}
bool QgsVectorTileLayer::loadDataSource()
{
QgsDataSourceUri dsUri;
dsUri.setEncodedUri( mDataSource );
mSourceType = dsUri.param( QStringLiteral( "type" ) );
mSourcePath = dsUri.param( QStringLiteral( "url" ) );
if ( mSourceType == QStringLiteral( "xyz" ) )
{
if ( !QgsVectorTileUtils::checkXYZUrlTemplate( mSourcePath ) )
{
QgsDebugMsg( QStringLiteral( "Invalid format of URL for XYZ source: " ) + mSourcePath );
return false;
}
// online tiles
mSourceMinZoom = 0;
mSourceMaxZoom = 14;
if ( dsUri.hasParam( QStringLiteral( "zmin" ) ) )
mSourceMinZoom = dsUri.param( QStringLiteral( "zmin" ) ).toInt();
if ( dsUri.hasParam( QStringLiteral( "zmax" ) ) )
mSourceMaxZoom = dsUri.param( QStringLiteral( "zmax" ) ).toInt();
setExtent( QgsRectangle( -20037508.3427892, -20037508.3427892, 20037508.3427892, 20037508.3427892 ) );
}
else if ( mSourceType == QStringLiteral( "mbtiles" ) )
{
QgsMbTiles reader( mSourcePath );
if ( !reader.open() )
{
QgsDebugMsg( QStringLiteral( "failed to open MBTiles file: " ) + mSourcePath );
return false;
}
QString format = reader.metadataValue( QStringLiteral( "format" ) );
if ( format != QStringLiteral( "pbf" ) )
{
QgsDebugMsg( QStringLiteral( "Cannot open MBTiles for vector tiles. Format = " ) + format );
return false;
}
QgsDebugMsgLevel( QStringLiteral( "name: " ) + reader.metadataValue( QStringLiteral( "name" ) ), 2 );
bool minZoomOk, maxZoomOk;
int minZoom = reader.metadataValue( QStringLiteral( "minzoom" ) ).toInt( &minZoomOk );
int maxZoom = reader.metadataValue( QStringLiteral( "maxzoom" ) ).toInt( &maxZoomOk );
if ( minZoomOk )
mSourceMinZoom = minZoom;
if ( maxZoomOk )
mSourceMaxZoom = maxZoom;
QgsDebugMsgLevel( QStringLiteral( "zoom range: %1 - %2" ).arg( mSourceMinZoom ).arg( mSourceMaxZoom ), 2 );
QgsRectangle r = reader.extent();
QgsCoordinateTransform ct( QgsCoordinateReferenceSystem( QStringLiteral( "EPSG:4326" ) ),
QgsCoordinateReferenceSystem( QStringLiteral( "EPSG:3857" ) ), transformContext() );
r = ct.transformBoundingBox( r );
setExtent( r );
}
else
{
QgsDebugMsg( QStringLiteral( "Unknown source type: " ) + mSourceType );
return false;
}
setCrs( QgsCoordinateReferenceSystem( QStringLiteral( "EPSG:3857" ) ) );
return true;
}
QgsVectorTileLayer::~QgsVectorTileLayer() = default;
QgsVectorTileLayer *QgsVectorTileLayer::clone() const
{
QgsVectorTileLayer *layer = new QgsVectorTileLayer( source(), name() );
layer->setRenderer( renderer() ? renderer()->clone() : nullptr );
return layer;
}
QgsMapLayerRenderer *QgsVectorTileLayer::createMapRenderer( QgsRenderContext &rendererContext )
{
return new QgsVectorTileLayerRenderer( this, rendererContext );
}
bool QgsVectorTileLayer::readXml( const QDomNode &layerNode, QgsReadWriteContext &context )
{
mValid = loadDataSource();
QString errorMsg;
return readSymbology( layerNode, errorMsg, context );
}
bool QgsVectorTileLayer::writeXml( QDomNode &layerNode, QDomDocument &doc, const QgsReadWriteContext &context ) const
{
QDomElement mapLayerNode = layerNode.toElement();
mapLayerNode.setAttribute( QStringLiteral( "type" ), QStringLiteral( "vector-tile" ) );
QString errorMsg;
return writeSymbology( layerNode, doc, errorMsg, context );
}
bool QgsVectorTileLayer::readSymbology( const QDomNode &node, QString &errorMessage, QgsReadWriteContext &context, QgsMapLayer::StyleCategories categories )
{
QDomElement elem = node.toElement();
readCommonStyle( elem, context, categories );
QDomElement elemRenderer = elem.firstChildElement( QStringLiteral( "renderer" ) );
if ( elemRenderer.isNull() )
{
errorMessage = tr( "Missing <renderer> tag" );
return false;
}
QString rendererType = elemRenderer.attribute( QStringLiteral( "type" ) );
QgsVectorTileRenderer *r = nullptr;
if ( rendererType == QStringLiteral( "basic" ) )
r = new QgsVectorTileBasicRenderer;
else
{
errorMessage = tr( "Unknown renderer type: " ) + rendererType;
return false;
}
r->readXml( elemRenderer, context );
setRenderer( r );
setLabeling( nullptr );
QDomElement elemLabeling = elem.firstChildElement( QStringLiteral( "labeling" ) );
if ( !elemLabeling.isNull() )
{
QString labelingType = elemLabeling.attribute( QStringLiteral( "type" ) );
QgsVectorTileLabeling *labeling = nullptr;
if ( labelingType == QStringLiteral( "basic" ) )
labeling = new QgsVectorTileBasicLabeling;
else
{
errorMessage = tr( "Unknown labeling type: " ) + rendererType;
}
if ( labeling )
{
labeling->readXml( elemLabeling, context );
setLabeling( labeling );
}
}
return true;
}
bool QgsVectorTileLayer::writeSymbology( QDomNode &node, QDomDocument &doc, QString &errorMessage, const QgsReadWriteContext &context, QgsMapLayer::StyleCategories categories ) const
{
Q_UNUSED( errorMessage )
QDomElement elem = node.toElement();
writeCommonStyle( elem, doc, context, categories );
if ( mRenderer )
{
QDomElement elemRenderer = doc.createElement( QStringLiteral( "renderer" ) );
elemRenderer.setAttribute( QStringLiteral( "type" ), mRenderer->type() );
mRenderer->writeXml( elemRenderer, context );
elem.appendChild( elemRenderer );
}
if ( mLabeling )
{
QDomElement elemLabeling = doc.createElement( QStringLiteral( "labeling" ) );
elemLabeling.setAttribute( QStringLiteral( "type" ), mLabeling->type() );
mLabeling->writeXml( elemLabeling, context );
elem.appendChild( elemLabeling );
}
return true;
}
void QgsVectorTileLayer::setTransformContext( const QgsCoordinateTransformContext &transformContext )
{
Q_UNUSED( transformContext )
}
QString QgsVectorTileLayer::encodedSource( const QString &source, const QgsReadWriteContext &context ) const
{
QgsDataSourceUri dsUri;
dsUri.setEncodedUri( source );
QString sourceType = dsUri.param( QStringLiteral( "type" ) );
QString sourcePath = dsUri.param( QStringLiteral( "url" ) );
if ( sourceType == QStringLiteral( "xyz" ) )
{
QUrl sourceUrl( sourcePath );
if ( sourceUrl.isLocalFile() )
{
// relative path will become "file:./x.txt"
QString relSrcUrl = context.pathResolver().writePath( sourceUrl.toLocalFile() );
dsUri.removeParam( QStringLiteral( "url" ) ); // needed because setParam() would insert second "url" key
dsUri.setParam( QStringLiteral( "url" ), QUrl::fromLocalFile( relSrcUrl ).toString() );
return dsUri.encodedUri();
}
}
else if ( sourceType == QStringLiteral( "mbtiles" ) )
{
sourcePath = context.pathResolver().writePath( sourcePath );
dsUri.removeParam( QStringLiteral( "url" ) ); // needed because setParam() would insert second "url" key
dsUri.setParam( QStringLiteral( "url" ), sourcePath );
return dsUri.encodedUri();
}
return source;
}
QString QgsVectorTileLayer::decodedSource( const QString &source, const QString &provider, const QgsReadWriteContext &context ) const
{
Q_UNUSED( provider )
QgsDataSourceUri dsUri;
dsUri.setEncodedUri( source );
QString sourceType = dsUri.param( QStringLiteral( "type" ) );
QString sourcePath = dsUri.param( QStringLiteral( "url" ) );
if ( sourceType == QStringLiteral( "xyz" ) )
{
QUrl sourceUrl( sourcePath );
if ( sourceUrl.isLocalFile() ) // file-based URL? convert to relative path
{
QString absSrcUrl = context.pathResolver().readPath( sourceUrl.toLocalFile() );
dsUri.removeParam( QStringLiteral( "url" ) ); // needed because setParam() would insert second "url" key
dsUri.setParam( QStringLiteral( "url" ), QUrl::fromLocalFile( absSrcUrl ).toString() );
return dsUri.encodedUri();
}
}
else if ( sourceType == QStringLiteral( "mbtiles" ) )
{
sourcePath = context.pathResolver().readPath( sourcePath );
dsUri.removeParam( QStringLiteral( "url" ) ); // needed because setParam() would insert second "url" key
dsUri.setParam( QStringLiteral( "url" ), sourcePath );
return dsUri.encodedUri();
}
return source;
}
QByteArray QgsVectorTileLayer::getRawTile( QgsTileXYZ tileID )
{
QgsTileMatrix tileMatrix = QgsTileMatrix::fromWebMercator( tileID.zoomLevel() );
QgsTileRange tileRange( tileID.column(), tileID.column(), tileID.row(), tileID.row() );
QList<QgsVectorTileRawData> rawTiles = QgsVectorTileLoader::blockingFetchTileRawData( mSourceType, mSourcePath, tileMatrix, QPointF(), tileRange );
if ( rawTiles.isEmpty() )
return QByteArray();
return rawTiles.first().data;
}
void QgsVectorTileLayer::setRenderer( QgsVectorTileRenderer *r )
{
mRenderer.reset( r );
triggerRepaint();
}
QgsVectorTileRenderer *QgsVectorTileLayer::renderer() const
{
return mRenderer.get();
}
void QgsVectorTileLayer::setLabeling( QgsVectorTileLabeling *labeling )
{
mLabeling.reset( labeling );
triggerRepaint();
}
QgsVectorTileLabeling *QgsVectorTileLayer::labeling() const
{
return mLabeling.get();
}