qgspointdisplacementrenderer.h

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/***************************************************************************
                              qgspointdisplacementrenderer.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 QGSPOINTDISPLACEMENTRENDERER_H
#define QGSPOINTDISPLACEMENTRENDERER_H

#include "qgsfeature.h"
#include "qgssymbolv2.h"
#include "qgspoint.h"
#include "qgsrendererv2.h"
#include <QFont>
#include <QSet>

class QgsVectorLayer;

class CORE_EXPORT QgsPointDisplacementRenderer: public QgsFeatureRendererV2
{
  public:
    QgsPointDisplacementRenderer( const QString& labelAttributeName = "" );
    ~QgsPointDisplacementRenderer();

    QgsFeatureRendererV2* clone();

    virtual void toSld( QDomDocument& doc, QDomElement &element ) const;

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

    QgsSymbolV2* symbolForFeature( QgsFeature& feature );

    void startRender( QgsRenderContext& context, const QgsVectorLayer *vlayer );

    void stopRender( QgsRenderContext& context );

    QList<QString> usedAttributes();
    QgsSymbolV2List symbols();

    static QgsFeatureRendererV2* create( QDomElement& symbologyElem );
    QDomElement save( QDomDocument& doc );

    QgsLegendSymbologyList legendSymbologyItems( QSize iconSize );

    QgsLegendSymbolList legendSymbolItems( double scaleDenominator = -1, QString rule = "" );

    void setLabelAttributeName( const QString& name ) { mLabelAttributeName = name; }
    QString labelAttributeName() const { return mLabelAttributeName; }

    void setEmbeddedRenderer( QgsFeatureRendererV2* r );
    QgsFeatureRendererV2* embeddedRenderer() { return mRenderer;}

    void setDisplacementGroups( const QList<QMap<QgsFeatureId, QgsFeature> >& list );

    void setLabelFont( const QFont& f ) { mLabelFont = f; }
    QFont labelFont() const { return mLabelFont;}

    void setCircleWidth( double w ) { mCircleWidth = w; }
    double circleWidth() const { return mCircleWidth; }

    void setCircleColor( const QColor& c ) { mCircleColor = c; }
    QColor circleColor() const { return mCircleColor; }

    void setLabelColor( const QColor& c ) { mLabelColor = c;}
    QColor labelColor() const { return mLabelColor; }

    void setCircleRadiusAddition( double d ) { mCircleRadiusAddition = d; }
    double circleRadiusAddition() const { return mCircleRadiusAddition; }

    void setMaxLabelScaleDenominator( double d ) { mMaxLabelScaleDenominator = d; }
    double maxLabelScaleDenominator() const { return mMaxLabelScaleDenominator; }

    QgsMarkerSymbolV2* centerSymbol() { return mCenterSymbol;}
    void setCenterSymbol( QgsMarkerSymbolV2* symbol );

    void setTolerance( double t ) { mTolerance = t; }
    double tolerance() const { return mTolerance; }

  private:

    QgsFeatureRendererV2* mRenderer;

    QString mLabelAttributeName;
    int mLabelIndex;

    QgsMarkerSymbolV2* mCenterSymbol;

    double mTolerance;

    QFont mLabelFont;
    QColor mLabelColor;
    double mCircleWidth;
    QColor mCircleColor;
    double mCircleRadiusAddition;
    bool mDrawLabels;
    double mMaxLabelScaleDenominator;

    QList<QMap<QgsFeatureId, QgsFeature> > mDisplacementGroups;
    QSet<QgsFeatureId> mDisplacementIds;

    void createDisplacementGroups( QgsVectorLayer *vlayer, const QgsRectangle& viewExtent );
    QgsRectangle searchRect( const QgsPoint& p ) const;
    void printInfoDisplacementGroups();

    QString getLabel( const QgsFeature& f );

    //rendering methods
    void renderPoint( const QPointF& point, QgsSymbolV2RenderContext& context, const QList<QgsMarkerSymbolV2*>& symbols,
                      const QStringList& labels );

    //helper functions
    void calculateSymbolAndLabelPositions( const QPointF& centerPoint, int nPosition, double radius, double symbolDiagonal, QList<QPointF>& symbolPositions, QList<QPointF>& labelShifts ) const;
    void drawCircle( double radiusPainterUnits, QgsSymbolV2RenderContext& context, const QPointF& centerPoint, int nSymbols );
    void drawSymbols( QgsFeature& f, QgsRenderContext& context, const QList<QgsMarkerSymbolV2*>& symbolList, const QList<QPointF>& symbolPositions, bool selected = false );
    void drawLabels( const QPointF& centerPoint, QgsSymbolV2RenderContext& context, const QList<QPointF>& labelShifts, const QStringList& labelList );
    QgsSymbolV2* firstSymbolForFeature( QgsFeatureRendererV2* r, QgsFeature& f );
};

#endif // QGSPOINTDISPLACEMENTRENDERER_H