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722fdefe43
The order of the elements is irrelevant and duplicate elements are unwanted. It is therefore a perfect candidate for a set instead of a list. This prevents filtering for duplicates manually be replacing some filer codes with (more performant) builtin methods of QSet.
108 lines
3.6 KiB
Plaintext
108 lines
3.6 KiB
Plaintext
/** \class QgsPointDisplacementRenderer
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* \ingroup core
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* A renderer that automatically displaces points with the same geographic location.
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*/
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class QgsPointDisplacementRenderer : QgsPointDistanceRenderer
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{
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%TypeHeaderCode
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#include <qgspointdisplacementrenderer.h>
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%End
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public:
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/** Placement methods for dispersing points
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*/
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enum Placement
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{
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Ring, /*!< Place points in a single ring around group*/
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ConcentricRings /*!< Place points in concentric rings around group*/
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};
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/** Constructor for QgsPointDisplacementRenderer.
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* @param labelAttributeName optional attribute name for labeling points
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*/
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QgsPointDisplacementRenderer( const QString& labelAttributeName = QString() );
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virtual QgsPointDisplacementRenderer* clone() const /Factory/;
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virtual void startRender( QgsRenderContext& context, const QgsFields& fields );
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void stopRender( QgsRenderContext& context );
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QDomElement save( QDomDocument& doc );
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virtual QSet<QString> usedAttributes() const;
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//! Create a renderer from XML element
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static QgsFeatureRenderer* create( QDomElement& symbologyElem ) /Factory/;
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/** Sets the line width for the displacement group circle.
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* @param width line width in mm
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* @see circleWidth()
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* @see setCircleColor()
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*/
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void setCircleWidth( double width );
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/** Returns the line width for the displacement group circle in mm.
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* @see setCircleWidth()
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* @see circleColor()
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*/
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double circleWidth() const;
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/** Sets the color used for drawing the displacement group circle.
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* @param color circle color
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* @see circleColor()
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* @see setCircleWidth()
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*/
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void setCircleColor( const QColor& color );
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/** Returns the color used for drawing the displacement group circle.
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* @see setCircleColor()
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* @see circleWidth()
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*/
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QColor circleColor() const;
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/** Sets a factor for increasing the ring size of displacement groups.
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* @param distance addition factor
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* @see circleRadiusAddition()
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*/
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void setCircleRadiusAddition( double distance );
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/** Returns the factor for increasing the ring size of displacement groups.
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* @see setCircleRadiusAddition()
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*/
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double circleRadiusAddition() const;
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/** Returns the placement method used for dispersing the points.
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* @see setPlacement()
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* @note added in QGIS 2.12
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*/
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Placement placement() const;
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/** Sets the placement method used for dispersing the points.
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* @param placement placement method
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* @see placement()
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* @note added in QGIS 2.12
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*/
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void setPlacement( Placement placement );
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/** Returns the symbol for the center of a displacement group (but not ownership of the symbol).
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* @see setCenterSymbol()
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*/
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QgsMarkerSymbol* centerSymbol();
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/** Sets the center symbol for a displacement group.
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* @param symbol new center symbol. Ownership is transferred to the renderer.
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* @see centerSymbol()
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*/
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void setCenterSymbol( QgsMarkerSymbol* symbol /Transfer/ );
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/** Creates a QgsPointDisplacementRenderer from an existing renderer.
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* @note added in 2.5
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* @returns a new renderer if the conversion was possible, otherwise nullptr.
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*/
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static QgsPointDisplacementRenderer* convertFromRenderer( const QgsFeatureRenderer *renderer ) /Factory/;
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private:
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QgsPointDisplacementRenderer( const QgsPointDisplacementRenderer & );
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QgsPointDisplacementRenderer & operator=( const QgsPointDisplacementRenderer & );
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void drawGroup( QPointF centerPoint, QgsRenderContext& context, const QgsPointDistanceRenderer::ClusteredGroup& group );
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};
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