qgsgeometrygeneratorsymbollayer.h

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/***************************************************************************
 qgsgeometrygeneratorsymbollayer.h
 ---------------------
 begin                : November 2015
 copyright            : (C) 2015 by Matthias Kuhn
 email                : matthias at opengis dot ch
 ***************************************************************************
 *                                                                         *
 *   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 QGSGEOMETRYGENERATORSYMBOLLAYER_H
#define QGSGEOMETRYGENERATORSYMBOLLAYER_H
 
#include "qgis.h"
#include "qgis_core.h"
#include "qgssymbollayer.h"
 
class QgsFillSymbol;
class QgsLineSymbol;
class QgsMarkerSymbol;

class CORE_EXPORT QgsGeometryGeneratorSymbolLayer : public QgsSymbolLayer
{
  public:
    ~QgsGeometryGeneratorSymbolLayer() override;

    static QgsSymbolLayer *create( const QVariantMap &properties ) SIP_FACTORY;
 
    QString layerType() const override;

    void setSymbolType( Qgis::SymbolType symbolType );

    Qgis::SymbolType symbolType() const { return mSymbolType; }
 
    void startRender( QgsSymbolRenderContext &context ) override;
    void stopRender( QgsSymbolRenderContext &context ) override;
    void startFeatureRender( const QgsFeature &feature, QgsRenderContext &context ) override;
    void stopFeatureRender( const QgsFeature &feature, QgsRenderContext &context ) override;
    bool usesMapUnits() const override;
    QColor color() const override;
    Qgis::RenderUnit outputUnit() const override;
    void setOutputUnit( Qgis::RenderUnit unit ) override;
    QgsMapUnitScale mapUnitScale() const override;
    bool rendersIdenticallyTo( const QgsSymbolLayer *other ) const override;
 
    QgsSymbolLayer *clone() const override SIP_FACTORY;
 
    QVariantMap properties() const override;
 
    void drawPreviewIcon( QgsSymbolRenderContext &context, QSize size ) override;

    void setGeometryExpression( const QString &exp );

    QString geometryExpression() const;

    Qgis::RenderUnit units() const { return mUnits; }

    void setUnits( Qgis::RenderUnit units ) { mUnits = units;}
 
    QgsSymbol *subSymbol() override { return mSymbol; }
 
    bool setSubSymbol( QgsSymbol *symbol SIP_TRANSFER ) override;
 
    QSet<QString> usedAttributes( const QgsRenderContext &context ) const override;
    bool hasDataDefinedProperties() const override;

    bool isCompatibleWithSymbol( QgsSymbol *symbol ) const override;

    void render( QgsSymbolRenderContext &context, Qgis::GeometryType geometryType = Qgis::GeometryType::Unknown, const QPolygonF *points = nullptr, const QVector<QPolygonF> *rings = nullptr );
 
    void setColor( const QColor &color ) override;
 
  private:
    QgsGeometryGeneratorSymbolLayer( const QString &expression );
 
#ifdef SIP_RUN
    QgsGeometryGeneratorSymbolLayer( const QgsGeometryGeneratorSymbolLayer &copy );
#endif

    QgsGeometry evaluateGeometryInPainterUnits( const QgsGeometry &input, const QgsFeature &feature, const QgsRenderContext &renderContext, QgsExpressionContext &expressionContext ) const;

    QgsGeometry coerceToExpectedType( const QgsGeometry &geometry ) const;
 
    std::unique_ptr<QgsExpression> mExpression;
    std::unique_ptr<QgsFillSymbol> mFillSymbol;
    std::unique_ptr<QgsLineSymbol> mLineSymbol;
    std::unique_ptr<QgsMarkerSymbol> mMarkerSymbol;
    QgsSymbol *mSymbol = nullptr;

    Qgis::SymbolType mSymbolType = Qgis::SymbolType::Marker;
 
    Qgis::RenderUnit mUnits = Qgis::RenderUnit::MapUnits;
 
    bool mRenderingFeature = false;
    bool mHasRenderedFeature = false;
};
 
#endif // QGSGEOMETRYGENERATORSYMBOLLAYER_H