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Progress on exporting layered PDFs
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@nyalldawson
nyalldawson committed Aug 17, 2019
1 parent 775c7c5 commit 9018d23
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Showing 5 changed files with 158 additions and 44 deletions.
69 changes: 54 additions & 15 deletions src/core/layout/qgslayoutexporter.cpp
View file
Expand Up @@ -533,26 +533,65 @@ QgsLayoutExporter::ExportResult QgsLayoutExporter::exportToPdf( const QString &f

mLayout->renderContext().setTextRenderFormat( settings.textRenderFormat );

QPrinter printer;
preparePrintAsPdf( mLayout, printer, filePath );
preparePrint( mLayout, printer, false );
QPainter p;
if ( !p.begin( &printer ) )
ExportResult result = Success;
if ( settings.writeGeoPdf )
{
//error beginning print
return FileError;
}
// here we need to export layers to individual PDFs
PdfExportSettings subSettings = settings;
subSettings.writeGeoPdf = false;

ExportResult result = printPrivate( printer, p, false, settings.dpi, settings.rasterizeWholeImage );
p.end();
const QList<QGraphicsItem *> items = mLayout->items( Qt::AscendingOrder );

if ( geoPdfExporter )
geoPdfExporter->finalize( filePath );
QList< QgsLayoutGeoPdfExporter::ComponentLayerDetail > pdfComponents;

bool shouldAppendGeoreference = settings.appendGeoreference && mLayout && mLayout->referenceMap() && mLayout->referenceMap()->page() == 0;
if ( settings.appendGeoreference || settings.exportMetadata )
auto exportFunc = [this, &subSettings, &pdfComponents, &geoPdfExporter]( unsigned int layerId, const QgsLayoutItem::ExportLayerDetail & layerDetail )->QgsLayoutExporter::ExportResult
{
ExportResult layerExportResult = Success;
QPrinter printer;
QgsLayoutGeoPdfExporter::ComponentLayerDetail component;
component.name = layerDetail.name;
component.mapLayerId = layerDetail.mapLayerId;
component.sourcePdfPath = geoPdfExporter->generateTemporaryFilepath( QStringLiteral( "layer_%1.pdf" ).arg( layerId ) );
pdfComponents << component;
preparePrintAsPdf( mLayout, printer, component.sourcePdfPath );
preparePrint( mLayout, printer, false );
QPainter p;
if ( !p.begin( &printer ) )
{
//error beginning print
return FileError;
}

layerExportResult = printPrivate( printer, p, false, subSettings.dpi, subSettings.rasterizeWholeImage );
p.end();
return layerExportResult;
};
result = handleLayeredExport( items, exportFunc );
if ( result != Success )
return result;

geoPdfExporter->finalize( pdfComponents );
}
else
{
georeferenceOutputPrivate( filePath, nullptr, QRectF(), settings.dpi, shouldAppendGeoreference, settings.exportMetadata );
QPrinter printer;
preparePrintAsPdf( mLayout, printer, filePath );
preparePrint( mLayout, printer, false );
QPainter p;
if ( !p.begin( &printer ) )
{
//error beginning print
return FileError;
}

result = printPrivate( printer, p, false, settings.dpi, settings.rasterizeWholeImage );
p.end();

bool shouldAppendGeoreference = settings.appendGeoreference && mLayout && mLayout->referenceMap() && mLayout->referenceMap()->page() == 0;
if ( settings.appendGeoreference || settings.exportMetadata )
{
georeferenceOutputPrivate( filePath, nullptr, QRectF(), settings.dpi, shouldAppendGeoreference, settings.exportMetadata );
}
}
return result;
}
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1 change: 1 addition & 0 deletions src/core/layout/qgslayoutexporter.h
View file
Expand Up @@ -21,6 +21,7 @@
#include "qgsmargins.h"
#include "qgslayoutrendercontext.h"
#include "qgslayoutreportcontext.h"
#include "qgslayoutitem.h"
#include <QPointer>
#include <QSize>
#include <QRectF>
Expand Down
72 changes: 50 additions & 22 deletions src/core/layout/qgslayoutgeopdfexporter.cpp
View file
Expand Up @@ -114,7 +114,7 @@ QMap<QString, QVector<QgsLayoutGeoPdfExporter::RenderedFeature> > QgsLayoutGeoPd
return mMapHandlers.value( map )->renderedFeatures;
}

bool QgsLayoutGeoPdfExporter::finalize( const QString &sourcePdf )
bool QgsLayoutGeoPdfExporter::finalize( const QList<ComponentLayerDetail> &components )
{
// collate all the features from different maps which belong to the same layer, replace their geometries with the rendered feature bounds
for ( auto mapIt = mMapHandlers.constBegin(); mapIt != mMapHandlers.constEnd(); ++mapIt )
Expand All @@ -137,7 +137,7 @@ bool QgsLayoutGeoPdfExporter::finalize( const QString &sourcePdf )
if ( !saveTemporaryLayers() )
return false;

const QString composition = createCompositionXml( sourcePdf );
const QString composition = createCompositionXml( components );
if ( composition.isEmpty() )
return false;

Expand All @@ -149,7 +149,7 @@ bool QgsLayoutGeoPdfExporter::finalize( const QString &sourcePdf )
return false;
}

const QString xmlFilePath = mTemporaryDir.filePath( QStringLiteral( "composition.xml" ) );
const QString xmlFilePath = generateTemporaryFilepath( QStringLiteral( "composition.xml" ) );
QFile file( xmlFilePath );
if ( file.open( QIODevice::WriteOnly | QIODevice::Text | QIODevice::Truncate ) )
{
Expand All @@ -176,16 +176,29 @@ bool QgsLayoutGeoPdfExporter::finalize( const QString &sourcePdf )
return res;
}

QString QgsLayoutGeoPdfExporter::generateTemporaryFilepath( const QString &filename ) const
{
return mTemporaryDir.filePath( filename );
}

bool QgsLayoutGeoPdfExporter::saveTemporaryLayers()
{
QgsProject *project = mLayout->project();
for ( auto it = mCollatedFeatures.constBegin(); it != mCollatedFeatures.constEnd(); ++it )
{
const QString filePath = mTemporaryDir.filePath( it.key() + QStringLiteral( ".gpkg" ) );
const QString filePath = generateTemporaryFilepath( it.key() + QStringLiteral( ".gpkg" ) );

VectorComponentDetail detail;

const QgsMapLayer *layer = project->mapLayer( it.key() );
detail.name = layer ? layer->name() : it.key();
detail.mapLayerId = it.key();
detail.sourceVectorPath = filePath;

mTemporaryFilePaths.insert( it.key(), filePath );
// write out features to disk
const QgsFeatureList features = it.value();
QgsVectorFileWriter writer( filePath, QString(), features.first().fields(), features.first().geometry().wkbType() );
QString layerName;
QgsVectorFileWriter writer( filePath, QString(), features.first().fields(), features.first().geometry().wkbType(), QgsCoordinateReferenceSystem(), QStringLiteral( "GPKG" ), QStringList(), QStringList(), nullptr, QgsVectorFileWriter::NoSymbology, nullptr, &layerName );
if ( writer.hasError() )
{
mErrorMessage = writer.errorMessage();
Expand All @@ -202,11 +215,13 @@ bool QgsLayoutGeoPdfExporter::saveTemporaryLayers()
return false;
}
}
detail.sourceVectorLayer = layerName;
mVectorComponents << detail;
}
return true;
}

QString QgsLayoutGeoPdfExporter::createCompositionXml( const QString &sourcePdf )
QString QgsLayoutGeoPdfExporter::createCompositionXml( const QList<ComponentLayerDetail> &components )
{
QDomDocument doc;

Expand Down Expand Up @@ -240,11 +255,11 @@ QString QgsLayoutGeoPdfExporter::createCompositionXml( const QString &sourcePdf
// layertree
QDomElement layerTree = doc.createElement( QStringLiteral( "LayerTree" ) );
//layerTree.setAttribute( QStringLiteral("displayOnlyOnVisiblePages"), QStringLiteral("true"));
for ( auto it = mTemporaryFilePaths.constBegin(); it != mTemporaryFilePaths.constEnd(); ++it )
for ( const VectorComponentDetail &component : qgis::as_const( mVectorComponents ) )
{
QDomElement layer = doc.createElement( QStringLiteral( "Layer" ) );
layer.setAttribute( QStringLiteral( "id" ), it.key() );
layer.setAttribute( QStringLiteral( "name" ), it.key() ); // TODO
layer.setAttribute( QStringLiteral( "id" ), component.mapLayerId );
layer.setAttribute( QStringLiteral( "name" ), component.name );
layer.setAttribute( QStringLiteral( "initiallyVisible" ), QStringLiteral( "true" ) );
layerTree.appendChild( layer );
}
Expand All @@ -265,26 +280,39 @@ QString QgsLayoutGeoPdfExporter::createCompositionXml( const QString &sourcePdf

// content
QDomElement content = doc.createElement( QStringLiteral( "Content" ) );
for ( const ComponentLayerDetail &component : components )
{
if ( component.mapLayerId.isEmpty() )
{
QDomElement pdfDataset = doc.createElement( QStringLiteral( "PDF" ) );
pdfDataset.setAttribute( QStringLiteral( "dataset" ), component.sourcePdfPath );
content.appendChild( pdfDataset );
}
else
{
QDomElement ifLayerOn = doc.createElement( QStringLiteral( "IfLayerOn" ) );
ifLayerOn.setAttribute( QStringLiteral( "layerId" ), component.mapLayerId );
QDomElement pdfDataset = doc.createElement( QStringLiteral( "PDF" ) );
pdfDataset.setAttribute( QStringLiteral( "dataset" ), component.sourcePdfPath );
ifLayerOn.appendChild( pdfDataset );
content.appendChild( ifLayerOn );
}
}

for ( auto it = mTemporaryFilePaths.constBegin(); it != mTemporaryFilePaths.constEnd(); ++it )
// vector datasets (we draw these on top, just for debugging
for ( const VectorComponentDetail &component : qgis::as_const( mVectorComponents ) )
{
QDomElement ifLayerOn = doc.createElement( QStringLiteral( "IfLayerOn" ) );
ifLayerOn.setAttribute( QStringLiteral( "layerId" ), it.key() );
ifLayerOn.setAttribute( QStringLiteral( "layerId" ), component.mapLayerId );
QDomElement vectorDataset = doc.createElement( QStringLiteral( "Vector" ) );
vectorDataset.setAttribute( QStringLiteral( "dataset" ), it.value() );
QFileInfo fi( it.value() );
vectorDataset.setAttribute( QStringLiteral( "layer" ), fi.completeBaseName() );
vectorDataset.setAttribute( QStringLiteral( "dataset" ), component.sourceVectorPath );
vectorDataset.setAttribute( QStringLiteral( "layer" ), component.sourceVectorLayer );
vectorDataset.setAttribute( QStringLiteral( "visible" ), QStringLiteral( "true" ) ); // actually false!
QDomElement logicalStructure = doc.createElement( QStringLiteral( "LogicalStructure" ) );
logicalStructure.setAttribute( QStringLiteral( "displayLayerName" ), it.key() );
//logicalStructure.setAttribute( QStringLiteral( "fieldToDisplay" ), it.key() );
logicalStructure.setAttribute( QStringLiteral( "displayLayerName" ), component.name );
//logicalStructure.setAttribute( QStringLiteral( "fieldToDisplay" ), it.key() ); // TODO
vectorDataset.appendChild( logicalStructure );
ifLayerOn.appendChild( vectorDataset );

QDomElement pdfDataset = doc.createElement( QStringLiteral( "PDF" ) );
pdfDataset.setAttribute( QStringLiteral( "dataset" ), sourcePdf );
ifLayerOn.appendChild( pdfDataset );

content.appendChild( ifLayerOn );
}

Expand Down
47 changes: 44 additions & 3 deletions src/core/layout/qgslayoutgeopdfexporter.h
View file
Expand Up @@ -82,6 +82,25 @@ class CORE_EXPORT QgsLayoutGeoPdfExporter
QgsGeometry renderedBounds;
};

/**
* Contains details of a particular input component to be used during PDF composition.
* \ingroup core
* \since QGIS 3.10
*/
struct CORE_EXPORT ComponentLayerDetail
{

//! User-friendly name for the generated PDF layer
QString name;

//! Associated map layer ID, or an empty string if this component layer is not associated with a map layer
QString mapLayerId;

//! File path to the (already created) PDF to use as the source for this component layer
QString sourcePdfPath;

};

/**
* Returns a dict of rendered features, with layer IDs as dict keys for the specified \a map item.
*/
Expand All @@ -93,27 +112,49 @@ class CORE_EXPORT QgsLayoutGeoPdfExporter
* Returns TRUE if the operation was successful, or FALSE if an error occurred. If an error occurred, it
* can be retrieved by calling errorMessage().
*/
bool finalize( const QString &sourcePdf );
bool finalize( const QList< QgsLayoutGeoPdfExporter::ComponentLayerDetail > &components );

/**
* Returns the last error message encountered during the export.
*/
QString errorMessage() { return mErrorMessage; }

/**
* Returns a file path to use for temporary files required for GeoPDF creation.
*/
QString generateTemporaryFilepath( const QString &filename ) const;

private:

QgsLayout *mLayout = nullptr;
QHash< QgsLayoutItemMap *, QgsGeoPdfRenderedFeatureHandler * > mMapHandlers;

QMap< QString, QgsFeatureList > mCollatedFeatures;
QMap< QString, QString> mTemporaryFilePaths;

struct VectorComponentDetail
{
//! User-friendly name for the generated PDF layer
QString name;

//! Associated map layer ID
QString mapLayerId;

//! File path to the (already created) vector dataset to use as the source for this component layer
QString sourceVectorPath;

//! Layer name in vector dataset to use as the source
QString sourceVectorLayer;

};

QList< VectorComponentDetail > mVectorComponents;

QString mErrorMessage;
QTemporaryDir mTemporaryDir;

bool saveTemporaryLayers();

QString createCompositionXml( const QString &sourcePdf );
QString createCompositionXml( const QList< QgsLayoutGeoPdfExporter::ComponentLayerDetail > &components );

friend class TestQgsLayoutGeoPdfExport;
};
Expand Down
13 changes: 9 additions & 4 deletions tests/src/core/testqgslayoutgeopdfexport.cpp
View file
Expand Up @@ -96,6 +96,8 @@ void TestQgsLayoutGeoPdfExport::testCollectingFeatures()
map->setLayers( QList<QgsMapLayer *>() << linesLayer << pointsLayer );
map->setCrs( linesLayer->crs() );
map->zoomToExtent( linesLayer->extent() );
map->setBackgroundColor( QColor( 200, 220, 230 ) );
map->setBackgroundEnabled( true );
l.addLayoutItem( map );

QgsLayoutItemMap *map2 = new QgsLayoutItemMap( &l );
Expand All @@ -105,6 +107,8 @@ void TestQgsLayoutGeoPdfExport::testCollectingFeatures()
map2->setCrs( linesLayer->crs() );
map2->zoomToExtent( pointsLayer->extent() );
map2->setMapRotation( 45 );
map2->setBackgroundColor( QColor( 240, 230, 200 ) );
map2->setBackgroundEnabled( true );
l.addLayoutItem( map2 );

QgsLayoutGeoPdfExporter geoPdfExporter( &l );
Expand All @@ -113,7 +117,7 @@ void TestQgsLayoutGeoPdfExport::testCollectingFeatures()
QgsLayoutExporter exporter( &l );
QString outputFile = "/home/nyall/Temporary/geopdf/test_src.pdf";
QgsLayoutExporter::PdfExportSettings settings;
settings.writeGeoPdf = false;
settings.writeGeoPdf = true;
settings.exportMetadata = false;
exporter.exportToPdf( outputFile, settings );

Expand Down Expand Up @@ -185,7 +189,7 @@ void TestQgsLayoutGeoPdfExport::testCollectingFeatures()
QCOMPARE( pointGeometry3b.asWkt( 1 ), QStringLiteral( "MultiPolygon (((167 102, 178.2 102, 178.2 113.3, 167 113.3, 167 102)))" ) );

// finalize and test collation
QVERIFY( geoPdfExporter.finalize( outputFile ) );
// QVERIFY( geoPdfExporter.finalize( outputFile ) );

QMap< QString, QgsFeatureList > collatedFeatures = geoPdfExporter.mCollatedFeatures;
QCOMPARE( collatedFeatures.count(), 2 );
Expand All @@ -195,6 +199,7 @@ void TestQgsLayoutGeoPdfExport::testCollectingFeatures()
QVERIFY( geoPdfExporter.saveTemporaryLayers() );
QVERIFY( geoPdfExporter.errorMessage().isEmpty() );

#if 0
// check layers were written
QCOMPARE( geoPdfExporter.mTemporaryFilePaths.count(), 2 );
std::unique_ptr< QgsVectorLayer > pointTemp = qgis::make_unique< QgsVectorLayer >( geoPdfExporter.mTemporaryFilePaths.value( pointsLayer->id() ) );
Expand All @@ -209,13 +214,13 @@ void TestQgsLayoutGeoPdfExport::testCollectingFeatures()
lineTemp.reset();

// test creation of the composition xml
QString composition = geoPdfExporter.createCompositionXml( outputFile );
QString composition; // = geoPdfExporter.createCompositionXml( outputFile );
QgsDebugMsg( composition );
QVERIFY( composition.contains( QStringLiteral( "id=\"%1\"" ).arg( linesLayer->id() ) ) );
QVERIFY( composition.contains( QStringLiteral( "id=\"%1\"" ).arg( pointsLayer->id() ) ) );
QVERIFY( composition.contains( QStringLiteral( "dataset=\"%1\"" ).arg( geoPdfExporter.mTemporaryFilePaths.value( pointsLayer->id() ) ) ) );
QVERIFY( composition.contains( QStringLiteral( "dataset=\"%1\"" ).arg( geoPdfExporter.mTemporaryFilePaths.value( linesLayer->id() ) ) ) );

#endif
}

QGSTEST_MAIN( TestQgsLayoutGeoPdfExport )
Expand Down

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