qgslayoutexporter.h

Go to the documentation of this file.

/***************************************************************************
                              qgslayoutexporter.h
                             -------------------
    begin                : October 2017
    copyright            : (C) 2017 by Nyall Dawson
    email                : nyall dot dawson 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.                                   *
 *                                                                         *
 ***************************************************************************/
#ifndef QGSLAYOUTEXPORTER_H
#define QGSLAYOUTEXPORTER_H
 
#include "qgis_core.h"
#include "qgsmargins.h"
#include "qgslayoutrendercontext.h"
#include "qgslayoutreportcontext.h"
#include "qgslayoutitem.h"
#include <QPointer>
#include <QSize>
#include <QRectF>
#include <functional>
 
#ifndef QT_NO_PRINTER
#include <QPrinter>
 
class QgsLayout;
class QPainter;
class QgsLayoutItemMap;
class QgsAbstractLayoutIterator;
class QgsFeedback;
 
class CORE_EXPORT QgsLayoutExporter
{
 
  public:
 
    struct PageExportDetails
    {
      QString directory;
 
      QString baseName;
 
      QString extension;
 
      int page = 0;
    };
 
    QgsLayoutExporter( QgsLayout *layout );
 
    virtual ~QgsLayoutExporter() = default;
 
    QgsLayout *layout() const;
 
    void renderPage( QPainter *painter, int page ) const;
 
    QImage renderPageToImage( int page, QSize imageSize = QSize(), double dpi = -1 ) const;
 
    void renderRegion( QPainter *painter, const QRectF &region ) const;
 
    QImage renderRegionToImage( const QRectF &region, QSize imageSize = QSize(), double dpi = -1 ) const;
 
 
    enum ExportResult
    {
      Success, 
      Canceled, 
      MemoryError, 
      FileError, 
      PrintError, 
      SvgLayerError, 
      IteratorError, 
    };
 
    struct ImageExportSettings
    {
      ImageExportSettings()
        : flags( QgsLayoutRenderContext::FlagAntialiasing | QgsLayoutRenderContext::FlagUseAdvancedEffects )
      {}
 
      double dpi = -1;
 
      QSize imageSize;
 
      bool cropToContents = false;
 
      QgsMargins cropMargins;
 
      QList< int > pages;
 
      bool generateWorldFile = false;
 
      bool exportMetadata = true;
 
 
      QgsLayoutRenderContext::Flags flags = QgsLayoutRenderContext::Flags();
 
      QVector<qreal> predefinedMapScales;
 
    };
 
    ExportResult exportToImage( const QString &filePath, const QgsLayoutExporter::ImageExportSettings &settings );
 
 
    static ExportResult exportToImage( QgsAbstractLayoutIterator *iterator, const QString &baseFilePath,
                                       const QString &extension, const QgsLayoutExporter::ImageExportSettings &settings,
                                       QString &error SIP_OUT, QgsFeedback *feedback = nullptr );
 
 
    struct PdfExportSettings
    {
      PdfExportSettings()
        : flags( QgsLayoutRenderContext::FlagAntialiasing | QgsLayoutRenderContext::FlagUseAdvancedEffects )
      {}
 
      double dpi = -1;
 
      bool rasterizeWholeImage = false;
 
      bool forceVectorOutput = false;
 
      bool appendGeoreference = true;
 
      bool exportMetadata = true;
 
      QgsLayoutRenderContext::Flags flags = QgsLayoutRenderContext::Flags();
 
      QgsRenderContext::TextRenderFormat textRenderFormat = QgsRenderContext::TextFormatAlwaysOutlines;
 
      bool simplifyGeometries = true;
 
      bool writeGeoPdf = false;
 
      bool exportLayersAsSeperateFiles = false; // TODO QGIS 4 fix typo  //#spellok
 
      bool useIso32000ExtensionFormatGeoreferencing = true;
 
      bool useOgcBestPracticeFormatGeoreferencing = false;
 
      bool includeGeoPdfFeatures = true;
 
      QStringList exportThemes;
 
      QVector<qreal> predefinedMapScales;
 
    };
 
    ExportResult exportToPdf( const QString &filePath, const QgsLayoutExporter::PdfExportSettings &settings );
 
    static ExportResult exportToPdf( QgsAbstractLayoutIterator *iterator, const QString &fileName,
                                     const QgsLayoutExporter::PdfExportSettings &settings,
                                     QString &error SIP_OUT, QgsFeedback *feedback = nullptr );
 
    static ExportResult exportToPdfs( QgsAbstractLayoutIterator *iterator, const QString &baseFilePath,
                                      const QgsLayoutExporter::PdfExportSettings &settings,
                                      QString &error SIP_OUT, QgsFeedback *feedback = nullptr );
 
 
    struct PrintExportSettings
    {
      PrintExportSettings()
        : flags( QgsLayoutRenderContext::FlagAntialiasing | QgsLayoutRenderContext::FlagUseAdvancedEffects )
      {}
 
      double dpi = -1;
 
      bool rasterizeWholeImage = false;
 
      QgsLayoutRenderContext::Flags flags = QgsLayoutRenderContext::Flags();
 
      QVector<qreal> predefinedMapScales;
 
    };
 
    ExportResult print( QPrinter &printer, const QgsLayoutExporter::PrintExportSettings &settings );
 
    static ExportResult print( QgsAbstractLayoutIterator *iterator, QPrinter &printer,
                               const QgsLayoutExporter::PrintExportSettings &settings,
                               QString &error SIP_OUT, QgsFeedback *feedback = nullptr );
 
 
    struct SvgExportSettings
    {
      SvgExportSettings()
        : flags( QgsLayoutRenderContext::FlagAntialiasing | QgsLayoutRenderContext::FlagUseAdvancedEffects )
      {}
 
      double dpi = -1;
 
      bool forceVectorOutput = false;
 
      bool cropToContents = false;
 
      QgsMargins cropMargins;
 
      bool exportAsLayers = false;
 
      bool exportLabelsToSeparateLayers = true;
 
      bool exportMetadata = true;
 
      QgsLayoutRenderContext::Flags flags = QgsLayoutRenderContext::Flags();
 
      QgsRenderContext::TextRenderFormat textRenderFormat = QgsRenderContext::TextFormatAlwaysOutlines;
 
      bool simplifyGeometries = true;
 
      QVector<qreal> predefinedMapScales;
    };
 
    ExportResult exportToSvg( const QString &filePath, const QgsLayoutExporter::SvgExportSettings &settings );
 
    static ExportResult exportToSvg( QgsAbstractLayoutIterator *iterator, const QString &baseFilePath,
                                     const QgsLayoutExporter::SvgExportSettings &settings,
                                     QString &error SIP_OUT, QgsFeedback *feedback = nullptr );
 
 
    QString errorFile() const { return mErrorFileName; }
 
    bool georeferenceOutput( const QString &file, QgsLayoutItemMap *referenceMap = nullptr,
                             const QRectF &exportRegion = QRectF(), double dpi = -1 ) const;
 
    void computeWorldFileParameters( double &a, double &b, double &c, double &d, double &e, double &f, double dpi = -1 ) const;
 
    void computeWorldFileParameters( const QRectF &region, double &a, double &b, double &c, double &d, double &e, double &f, double dpi = -1 ) const;
 
  protected:
 
    virtual QString generateFileName( const PageExportDetails &details ) const;
 
  private:
 
    QPointer< QgsLayout > mLayout;
 
    mutable QString mErrorFileName;
 
    QImage createImage( const ImageExportSettings &settings, int page, QRectF &bounds, bool &skipPage ) const;
 
    static int firstPageToBeExported( QgsLayout *layout );
 
    static bool saveImage( const QImage &image, const QString &imageFilename, const QString &imageFormat, QgsProject *projectForMetadata );
 
    std::unique_ptr<double[]> computeGeoTransform( const QgsLayoutItemMap *referenceMap = nullptr, const QRectF &exportRegion = QRectF(), double dpi = -1 ) const;
 
    void writeWorldFile( const QString &fileName, double a, double b, double c, double d, double e, double f ) const;
 
    static void preparePrintAsPdf( QgsLayout *layout, QPrinter &printer, const QString &filePath );
 
    static void preparePrint( QgsLayout *layout, QPrinter &printer, bool setFirstPageSize = false );
 
    ExportResult print( QPrinter &printer );
 
    ExportResult printPrivate( QPrinter &printer, QPainter &painter, bool startNewPage = false, double dpi = -1, bool rasterize = false );
 
    static void updatePrinterPageSize( QgsLayout *layout, QPrinter &printer, int page );
 
    ExportResult renderToLayeredSvg( const SvgExportSettings &settings, double width, double height, int page, const QRectF &bounds,
                                     const QString &filename, unsigned int svgLayerId, const QString &layerName,
                                     QDomDocument &svg, QDomNode &svgDocRoot, bool includeMetadata ) const;
 
    void appendMetadataToSvg( QDomDocument &svg ) const;
 
    bool georeferenceOutputPrivate( const QString &file, QgsLayoutItemMap *referenceMap = nullptr,
                                    const QRectF &exportRegion = QRectF(), double dpi = -1, bool includeGeoreference = true, bool includeMetadata = false ) const;
 
    ExportResult handleLayeredExport( const QList<QGraphicsItem *> &items, const std::function<QgsLayoutExporter::ExportResult( unsigned int layerId, const QgsLayoutItem::ExportLayerDetail &layerDetails )> &exportFunc );
 
    static QgsVectorSimplifyMethod createExportSimplifyMethod();
    friend class TestQgsLayout;
    friend class TestQgsLayoutExporter;
 
};
 
#endif // ! QT_NO_PRINTER
 
#endif //QGSLAYOUTEXPORTER_H