qgsinvertedpolygonrenderer.h

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/***************************************************************************
    qgsinvertedpolygonrenderer.h
    ---------------------
    begin                : April 2014
    copyright            : (C) 2014 Hugo Mercier / Oslandia
    email                : hugo dot mercier at oslandia 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 QGSINVERTEDPOLYGONRENDERER_H
#define QGSINVERTEDPOLYGONRENDERER_H

#include "qgis.h"
#include "qgsrendererv2.h"
#include "qgssymbolv2.h"
#include "qgsexpression.h"
#include "qgsfeature.h"
#include "qgsgeometry.h"
#include <QScopedPointer>

class CORE_EXPORT QgsInvertedPolygonRenderer : public QgsFeatureRendererV2
{
  public:

    QgsInvertedPolygonRenderer( const QgsFeatureRendererV2* embeddedRenderer = 0 );
    virtual ~QgsInvertedPolygonRenderer();

    virtual QgsFeatureRendererV2* clone() const;

    virtual void startRender( QgsRenderContext& context, const QgsFields& fields );

    virtual bool renderFeature( QgsFeature& feature, QgsRenderContext& context, int layer = -1, bool selected = false, bool drawVertexMarker = false );

    virtual void stopRender( QgsRenderContext& context );

    virtual QString dump() const;

    virtual QList<QString> usedAttributes();
    virtual int capabilities();
    virtual QgsSymbolV2List symbols();
    virtual QgsSymbolV2* symbolForFeature( QgsFeature& feature );
    virtual QgsSymbolV2* originalSymbolForFeature( QgsFeature& feat );
    virtual QgsSymbolV2List symbolsForFeature( QgsFeature& feat );
    virtual QgsSymbolV2List originalSymbolsForFeature( QgsFeature& feat );
    virtual QgsLegendSymbologyList legendSymbologyItems( QSize iconSize );
    virtual QgsLegendSymbolList legendSymbolItems( double scaleDenominator = -1, QString rule = "" );
    virtual bool willRenderFeature( QgsFeature& feat );

    static QgsFeatureRendererV2* create( QDomElement& element );

    virtual QDomElement save( QDomDocument& doc );

    void setEmbeddedRenderer( const QgsFeatureRendererV2* subRenderer );
    const QgsFeatureRendererV2* embeddedRenderer() const;

    bool preprocessingEnabled() const { return mPreprocessingEnabled; }
    void setPreprocessingEnabled( bool enabled ) { mPreprocessingEnabled = enabled; }

    static QgsInvertedPolygonRenderer* convertFromRenderer( const QgsFeatureRendererV2* renderer );

  private:
    QgsInvertedPolygonRenderer( const QgsInvertedPolygonRenderer& );
    QgsInvertedPolygonRenderer& operator=( const QgsInvertedPolygonRenderer& );

    QScopedPointer<QgsFeatureRendererV2> mSubRenderer;

    struct CombinedFeature
    {
      QList<QgsGeometry*> geometries; //< list of geometries
      QgsFeature feature;             //< one feature (for attriute-based rendering)
    };
    typedef QVector<CombinedFeature> FeatureCategoryVector;
    FeatureCategoryVector mFeaturesCategories;

    QMap<QByteArray, int> mSymbolCategories;

    QgsPolygon mExtentPolygon;

    QgsRenderContext mContext;

    QgsFields mFields;

    struct FeatureDecoration
    {
      QgsFeature feature;
      bool selected;
      bool drawMarkers;
      int layer;
      FeatureDecoration( QgsFeature& a_feature, bool a_selected, bool a_drawMarkers, int a_layer ) :
          feature( a_feature ), selected( a_selected ), drawMarkers( a_drawMarkers ), layer( a_layer ) {}
    };
    QList<FeatureDecoration> mFeatureDecorations;

    bool mPreprocessingEnabled;
};


#endif // QGSMASKRENDERERV2_H