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Georeference PDFs (WIP)
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@nyalldawson
nyalldawson committed Aug 17, 2019
1 parent 9018d23 commit 6fd3366
Showing 1 changed file with 66 additions and 1 deletion.
67 changes: 66 additions & 1 deletion src/core/layout/qgslayoutgeopdfexporter.cpp
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Expand Up @@ -47,6 +47,8 @@ class QgsGeoPdfRenderedFeatureHandler: public QgsRenderedFeatureHandlerInterface

//create transform from layout coordinates to map coordinates
QTransform::quadToQuad( mapRectPoly, mapRectInLayout, mMapToLayoutTransform );

mLayoutToPdfTransform = QTransform::fromTranslate( 0, 595 ).scale( 842.0 / 297, -595.0 / 210 );
}

void handleRenderedFeature( const QgsFeature &feature, const QgsGeometry &renderedBounds, const QgsRenderedFeatureHandlerInterface::RenderedFeatureContext &context ) override
Expand All @@ -62,6 +64,8 @@ class QgsGeoPdfRenderedFeatureHandler: public QgsRenderedFeatureHandlerInterface
transformed.transform( pixelToMapItemTransform );
// transform from map item coordinates to page coordinates
transformed.transform( mMapToLayoutTransform );
// ...and then to PDF coordinate space
transformed.transform( mLayoutToPdfTransform );

// always convert to multitype, to make things consistent
transformed.convertToMultiType();
Expand All @@ -81,6 +85,7 @@ class QgsGeoPdfRenderedFeatureHandler: public QgsRenderedFeatureHandlerInterface

private:
QTransform mMapToLayoutTransform;
QTransform mLayoutToPdfTransform;
QMutex mMutex;
};

Expand Down Expand Up @@ -276,7 +281,67 @@ QString QgsLayoutGeoPdfExporter::createCompositionXml( const QList<ComponentLaye
QDomElement height = doc.createElement( QStringLiteral( "Height" ) );
height.appendChild( doc.createTextNode( QStringLiteral( "595" ) ) );
page.appendChild( height );


// georeferencing - TODO
QDomElement georeferencing = doc.createElement( QStringLiteral( "Georeferencing" ) );
georeferencing.setAttribute( QStringLiteral( "id" ), QStringLiteral( "georeferenced" ) );
georeferencing.setAttribute( QStringLiteral( "OGCBestPracticeFormat" ), QStringLiteral( "true" ) );
georeferencing.setAttribute( QStringLiteral( "ISO32000ExtensionFormat" ), QStringLiteral( "false" ) );
QDomElement srs = doc.createElement( QStringLiteral( "SRS" ) );
srs.setAttribute( QStringLiteral( "dataAxisToSRSAxisMapping" ), QStringLiteral( "2,1" ) );
srs.appendChild( doc.createTextNode( QStringLiteral( "EPSG:4326" ) ) );
georeferencing.appendChild( srs );
#if 0
/* Define the viewport where georeferenced coordinates are available.
If not specified, the extent of BoundingPolygon will be used instead.
If none of BoundingBox and BoundingPolygon are specified,
the whole PDF page will be assumed to be georeferenced.
*/
QDomElement boundingBox = doc.createElement( QStringLiteral( "BoundingBox" ) );
boundingBox.setAttribute( QStringLiteral( "x1" ), QStringLiteral( "1" ) );
boundingBox.setAttribute( QStringLiteral( "y1" ), QStringLiteral( "1" ) );
boundingBox.setAttribute( QStringLiteral( "x2" ), QStringLiteral( "9" ) );
boundingBox.setAttribute( QStringLiteral( "y2" ), QStringLiteral( "14" ) );
georeferencing.appendChild( boundingBox );
/*
Define a polygon / neatline in PDF units into which the
Measure tool will display coordinates.
If not specified, BoundingBox will be used instead.
If none of BoundingBox and BoundingPolygon are specified,
the whole PDF page will be assumed to be georeferenced.
*/
QDomElement boundingPolygon = doc.createElement( QStringLiteral( "BoundingPolygon" ) );
boundingPolygon.appendChild( doc.createTextNode( QStringLiteral( "POLYGON((1 1,9 1,9 14,1 14,1 1))" ) ) );
georeferencing.appendChild( boundingPolygon );
#endif
QDomElement cp1 = doc.createElement( QStringLiteral( "ControlPoint" ) );
cp1.setAttribute( QStringLiteral( "x" ), QStringLiteral( "1" ) );
cp1.setAttribute( QStringLiteral( "y" ), QStringLiteral( "1" ) );
cp1.setAttribute( QStringLiteral( "GeoX" ), QStringLiteral( "2" ) );
cp1.setAttribute( QStringLiteral( "GeoY" ), QStringLiteral( "48" ) );
georeferencing.appendChild( cp1 );
QDomElement cp2 = doc.createElement( QStringLiteral( "ControlPoint" ) );
cp2.setAttribute( QStringLiteral( "x" ), QStringLiteral( "1" ) );
cp2.setAttribute( QStringLiteral( "y" ), QStringLiteral( "14" ) );
cp2.setAttribute( QStringLiteral( "GeoX" ), QStringLiteral( "2" ) );
cp2.setAttribute( QStringLiteral( "GeoY" ), QStringLiteral( "49" ) );
georeferencing.appendChild( cp2 );
QDomElement cp3 = doc.createElement( QStringLiteral( "ControlPoint" ) );
cp3.setAttribute( QStringLiteral( "x" ), QStringLiteral( "9" ) );
cp3.setAttribute( QStringLiteral( "y" ), QStringLiteral( "1" ) );
cp3.setAttribute( QStringLiteral( "GeoX" ), QStringLiteral( "3" ) );
cp3.setAttribute( QStringLiteral( "GeoY" ), QStringLiteral( "48" ) );
georeferencing.appendChild( cp3 );
QDomElement cp4 = doc.createElement( QStringLiteral( "ControlPoint" ) );
cp4.setAttribute( QStringLiteral( "x" ), QStringLiteral( "9" ) );
cp4.setAttribute( QStringLiteral( "y" ), QStringLiteral( "14" ) );
cp4.setAttribute( QStringLiteral( "GeoX" ), QStringLiteral( "3" ) );
cp4.setAttribute( QStringLiteral( "GeoY" ), QStringLiteral( "49" ) );
georeferencing.appendChild( cp4 );

page.appendChild( georeferencing );


// content
QDomElement content = doc.createElement( QStringLiteral( "Content" ) );
Expand Down Expand Up @@ -307,7 +372,7 @@ QString QgsLayoutGeoPdfExporter::createCompositionXml( const QList<ComponentLaye
QDomElement vectorDataset = doc.createElement( QStringLiteral( "Vector" ) );
vectorDataset.setAttribute( QStringLiteral( "dataset" ), component.sourceVectorPath );
vectorDataset.setAttribute( QStringLiteral( "layer" ), component.sourceVectorLayer );
vectorDataset.setAttribute( QStringLiteral( "visible" ), QStringLiteral( "true" ) ); // actually false!
vectorDataset.setAttribute( QStringLiteral( "visible" ), QStringLiteral( "false" ) );
QDomElement logicalStructure = doc.createElement( QStringLiteral( "LogicalStructure" ) );
logicalStructure.setAttribute( QStringLiteral( "displayLayerName" ), component.name );
//logicalStructure.setAttribute( QStringLiteral( "fieldToDisplay" ), it.key() ); // TODO
Expand Down

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