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The "arrow" symbol layer is a symbol layer allowing to draw straight or curved arrows from a line layer.
112 lines
3.8 KiB
Plaintext
112 lines
3.8 KiB
Plaintext
class QgsArrowSymbolLayer : public QgsLineSymbolLayerV2
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{
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%TypeHeaderCode
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#include <qgsarrowsymbollayer.h>
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%End
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public:
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/** Simple constructor */
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QgsArrowSymbolLayer();
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/**
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* Create a new QgsArrowSymbolLayer
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*
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* @param properties A property map to deserialize saved information from properties()
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*
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* @return A new QgsArrowSymbolLayer
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*/
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static QgsSymbolLayerV2* create( const QgsStringMap& properties ) /Factory/;
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/** Virtual constructor */
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virtual QgsArrowSymbolLayer* clone() const /Factory/;
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/** Get the sub symbol used for filling */
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virtual QgsSymbolV2* subSymbol();
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/** Set the sub symbol used for filling */
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virtual bool setSubSymbol( QgsSymbolV2* symbol );
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/** Return a list of attributes required to render this feature */
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virtual QSet<QString> usedAttributes() const;
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/** Get current arrow width */
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double arrowWidth() const;
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/** Set the arrow width */
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void setArrowWidth( double w );
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/** Get the unit for the arrow width */
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QgsSymbolV2::OutputUnit arrowWidthUnit() const;
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/** Set the unit for the arrow width */
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void setArrowWidthUnit( QgsSymbolV2::OutputUnit u );
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/** Get the scale for the arrow width */
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QgsMapUnitScale arrowWidthUnitScale() const;
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/** Set the scale for the arrow width */
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void setArrowWidthUnitScale( const QgsMapUnitScale& s );
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/** Get current arrow start width. Only meaningfull for single headed arrows */
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double arrowStartWidth() const;
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/** Set the arrow start width */
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void setArrowStartWidth( double w );
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/** Get the unit for the arrow start width */
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QgsSymbolV2::OutputUnit arrowStartWidthUnit() const;
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/** Set the unit for the arrow start width */
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void setArrowStartWidthUnit( QgsSymbolV2::OutputUnit u );
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/** Get the scale for the arrow start width */
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QgsMapUnitScale arrowStartWidthUnitScale() const;
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/** Set the scale for the arrow start width */
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void setArrowStartWidthUnitScale( const QgsMapUnitScale& s );
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/** Get the current arrow head size */
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double headSize() const;
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/** Set the arrow head size */
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void setHeadSize( double s );
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/** Get the unit for the head size */
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QgsSymbolV2::OutputUnit headSizeUnit() const;
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/** Set the unit for the head size */
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void setHeadSizeUnit( QgsSymbolV2::OutputUnit u );
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/** Get the scale for the head size */
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QgsMapUnitScale headSizeUnitScale() const;
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/** Set the scale for the head size */
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void setHeadSizeUnitScale( const QgsMapUnitScale& s );
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/** Return whether it is a curved arrow or a straight one */
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bool isCurved() const;
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/** Set whether it is a curved arrow or a straight one */
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void setIsCurved( bool isCurved );
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/** Possible head types */
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enum HeadType
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{
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HeadSingle, //< One single head at the end
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HeadReversed, //< One single head at the beginning
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HeadDouble //< Two heads
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};
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/** Get the current head type */
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HeadType headType() const;
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/** Set the head type */
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void setHeadType( HeadType t );
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/**
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* Should be reimplemented by subclasses to return a string map that
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* contains the configuration information for the symbol layer. This
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* is used to serialize a symbol layer perstistently.
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*/
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QgsStringMap properties() const;
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/**
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* Returns a string that represents this layer type. Used for serialization.
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* Should match with the string used to register this symbol layer in the registry.
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*/
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QString layerType() const;
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/** Prepare the rendering */
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void startRender( QgsSymbolV2RenderContext& context );
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/** End of the rendering */
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void stopRender( QgsSymbolV2RenderContext& context );
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/** Main drawing method */
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void renderPolyline( const QPolygonF& points, QgsSymbolV2RenderContext& context );
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private:
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QgsArrowSymbolLayer( const QgsArrowSymbolLayer& );
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};
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