qgsmeshlayerlabelprovider.h

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/***************************************************************************
                         qgsmeshlayerlabelprovider.h
                         ---------------------
    begin                : November 2023
    copyright            : (C) 2023 by Alexander Bruy
    email                : alexander dot bruy 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 QGSMESHLAYERLABELPROVIDER_H
#define QGSMESHLAYERLABELPROVIDER_H
 
 
#include "qgis_core.h"
#include "qgslabelingengine.h"
#include "qgspallabeling.h"
#include "qgsrenderer.h"
 
#define SIP_NO_FILE
 
class QgsMeshLayer;

class CORE_EXPORT QgsMeshLayerLabelProvider : public QgsAbstractLabelProvider
{
  public:

    explicit QgsMeshLayerLabelProvider( QgsMeshLayer *layer,
                                        const QString &providerId,
                                        const QgsPalLayerSettings *settings,
                                        const QString &layerName = QString(),
                                        bool labelFaces = false );
 
    ~QgsMeshLayerLabelProvider() override;
 
    QList<QgsLabelFeature *> labelFeatures( QgsRenderContext &context ) override;
 
    //void drawLabelBackground( QgsRenderContext &context, pal::LabelPosition *label ) const override;
    void drawLabel( QgsRenderContext &context, pal::LabelPosition *label ) const override;
    //void drawUnplacedLabel( QgsRenderContext &context, pal::LabelPosition *label ) const override;
    void startRender( QgsRenderContext &context ) override;
    void stopRender( QgsRenderContext &context ) override;

    virtual bool prepare( QgsRenderContext &context, QSet<QString> &attributeNames );

    virtual QList< QgsLabelFeature * > registerFeature( const QgsFeature &feature, QgsRenderContext &context, const QgsGeometry &obstacleGeometry = QgsGeometry(), const QgsSymbol *symbol = nullptr );

    const QgsPalLayerSettings &settings() const;

    bool labelFaces() const { return mLabelFaces; }
 
  protected:
    void init();
    void drawLabelPrivate( pal::LabelPosition *label, QgsRenderContext &context, QgsPalLayerSettings &tmpLyr, Qgis::TextComponent drawType, double dpiRatio = 1.0 ) const;
 
  protected:
    QgsPalLayerSettings mSettings;
 
    bool mLabelFaces = false;

    QgsCoordinateReferenceSystem mCrs;

    QList<QgsLabelFeature *> mLabels;
 
  private:
    std::unique_ptr<QgsVectorLayerLabelProvider> mVectorLabelProvider;
 
    friend class TestQgsLabelingEngine;
};
 
#endif // QGSMESHLAYERLABELPROVIDER_H