qgspointdistancerenderer.h

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/***************************************************************************
                              qgspointdistancerenderer.cpp
                              ----------------------------
  begin                : January 26, 2010
  copyright            : (C) 2010 by Marco Hugentobler
  email                : marco at hugis dot net
 ***************************************************************************/
 
/***************************************************************************
 *                                                                         *
 *   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 QGSPOINTDISTANCERENDERER_H
#define QGSPOINTDISTANCERENDERER_H
 
#include "qgis_core.h"
#include "qgis.h"
#include "qgsrenderer.h"
#include "qgsmapunitscale.h"
#include <QFont>
 
class QgsSpatialIndex;
class QgsMarkerSymbol;
class QgsSymbolRenderContext;
 
class CORE_EXPORT QgsPointDistanceRenderer: public QgsFeatureRenderer
{
  public:
 
    struct CORE_EXPORT GroupedFeature
    {
 
        GroupedFeature( const QgsFeature &feature, QgsMarkerSymbol *symbol SIP_TRANSFER, bool isSelected, const QString &label = QString() );
        ~GroupedFeature();
 
        QgsFeature feature;
 
        QgsMarkerSymbol *symbol() const { return mSymbol.get(); }
 
        bool isSelected;
 
        QString label;
 
      private:
        std::shared_ptr< QgsMarkerSymbol > mSymbol;
    };
 
    typedef QList< QgsPointDistanceRenderer::GroupedFeature > ClusteredGroup;
 
    QgsPointDistanceRenderer( const QString &rendererName, const QString &labelAttributeName = QString() );
 
    void toSld( QDomDocument &doc, QDomElement &element, const QVariantMap &props = QVariantMap() ) const override;
    bool renderFeature( const QgsFeature &feature, QgsRenderContext &context, int layer = -1, bool selected = false, bool drawVertexMarker = false ) override SIP_THROW( QgsCsException );
    QSet<QString> usedAttributes( const QgsRenderContext &context ) const override;
    bool filterNeedsGeometry() const override;
    QgsFeatureRenderer::Capabilities capabilities() override;
    QgsSymbolList symbols( QgsRenderContext &context ) const override;
    QgsSymbol *symbolForFeature( const QgsFeature &feature, QgsRenderContext &context ) const override;
    QgsSymbol *originalSymbolForFeature( const QgsFeature &feature, QgsRenderContext &context ) const override;
    QgsSymbolList symbolsForFeature( const QgsFeature &feature, QgsRenderContext &context ) const override;
    QgsSymbolList originalSymbolsForFeature( const QgsFeature &feature, QgsRenderContext &context ) const override;
    QSet< QString > legendKeysForFeature( const QgsFeature &feature, QgsRenderContext &context ) const override;
    QString legendKeyToExpression( const QString &key, QgsVectorLayer *layer, bool &ok ) const override;
    bool willRenderFeature( const QgsFeature &feature, QgsRenderContext &context ) const override;
    void startRender( QgsRenderContext &context, const QgsFields &fields ) override;
    void stopRender( QgsRenderContext &context ) override;
    QgsLegendSymbolList legendSymbolItems() const override;
    void setEmbeddedRenderer( QgsFeatureRenderer *r SIP_TRANSFER ) override;
    const QgsFeatureRenderer *embeddedRenderer() const override;
    void setLegendSymbolItem( const QString &key, QgsSymbol *symbol SIP_TRANSFER ) override;
    bool legendSymbolItemsCheckable() const override;
    bool legendSymbolItemChecked( const QString &key ) override;
    void checkLegendSymbolItem( const QString &key, bool state ) override;
    QString filter( const QgsFields &fields = QgsFields() ) override;
    bool accept( QgsStyleEntityVisitorInterface *visitor ) const override;
 
    void setLabelAttributeName( const QString &name ) { mLabelAttributeName = name; }
 
    QString labelAttributeName() const { return mLabelAttributeName; }
 
    void setLabelFont( const QFont &font ) { mLabelFont = font; }
 
    QFont labelFont() const { return mLabelFont;}
 
    void setMinimumLabelScale( double scale ) { mMinLabelScale = scale; }
 
    double minimumLabelScale() const { return mMinLabelScale; }
 
    void setLabelColor( const QColor &color ) { mLabelColor = color;}
 
    QColor labelColor() const { return mLabelColor; }
 
    void setTolerance( double distance ) { mTolerance = distance; }
 
    double tolerance() const { return mTolerance; }
 
    void setToleranceUnit( QgsUnitTypes::RenderUnit unit ) { mToleranceUnit = unit; }
 
    QgsUnitTypes::RenderUnit toleranceUnit() const { return mToleranceUnit; }
 
    void setToleranceMapUnitScale( const QgsMapUnitScale &scale ) { mToleranceMapUnitScale = scale; }
 
    const QgsMapUnitScale &toleranceMapUnitScale() const { return mToleranceMapUnitScale; }
 
  protected:
 
    std::unique_ptr< QgsFeatureRenderer > mRenderer;
 
    QString mLabelAttributeName;
 
    int mLabelIndex;
 
    double mTolerance;
    QgsUnitTypes::RenderUnit mToleranceUnit;
    QgsMapUnitScale mToleranceMapUnitScale;
 
    QFont mLabelFont;
    QColor mLabelColor;
    bool mDrawLabels;
    double mMinLabelScale = 0;
 
    QList<ClusteredGroup> mClusteredGroups;
 
    QMap<QgsFeatureId, int> mGroupIndex;
 
    QMap<QgsFeatureId, QgsPointXY > mGroupLocations;
 
    QgsSpatialIndex *mSpatialIndex = nullptr;
 
    void drawLabels( QPointF centerPoint, QgsSymbolRenderContext &context, const QList<QPointF> &labelShifts, const ClusteredGroup &group ) const;
 
  private:
 
    virtual void drawGroup( QPointF centerPoint, QgsRenderContext &context, const ClusteredGroup &group ) const = 0 SIP_FORCE;
 
    QgsRectangle searchRect( const QgsPoint *p, double distance ) const;
 
    void printGroupInfo() const;
 
    QString getLabel( const QgsFeature &feature ) const;
 
    void drawGroup( const ClusteredGroup &group, QgsRenderContext &context ) const;
 
    QgsMarkerSymbol *firstSymbolForFeature( const QgsFeature &feature, QgsRenderContext &context );
 
    QgsExpressionContextScope *createGroupScope( const ClusteredGroup &group ) const;
 
};
 
#endif // QGSPOINTDISTANCERENDERER_H