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66ae77dcb1
git-svn-id: http://svn.osgeo.org/qgis/trunk/qgis@9437 c8812cc2-4d05-0410-92ff-de0c093fc19c
47 lines
2.4 KiB
Plaintext
47 lines
2.4 KiB
Plaintext
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/**Abstract base class for renderers. A renderer holds all the information necessary to draw the contents of a vector layer to a map canvas. The vector layer then passes each feature to paint to the renderer*/
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class QgsRenderer
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{
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%TypeHeaderCode
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#include <qgsrenderer.h>
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%End
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public:
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/** Default ctor sets up selection colour from project properties */
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QgsRenderer();
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/** Virtual destructor because we have virtual methods... */
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virtual ~QgsRenderer();
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/**A vector layer passes features to a renderer object to change the brush and pen of the qpainter
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@param p the painter storing brush and pen
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@param f a pointer to the feature to be rendered
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@param pic pointer to a marker from SVG (is only used by marker renderers)
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@param scalefactor pointer to the scale factor for the marker image*/
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virtual void renderFeature(QPainter* p, QgsFeature& f,QImage* pic, bool selected, double widthScale = 1.0, double rasterScaleFactor = 1.0)=0;
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/**Reads the renderer configuration from an XML file
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@param rnode the Dom node to read
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@param vl the vector layer which will be associated with the renderer*/
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virtual int readXML(const QDomNode& rnode, QgsVectorLayer& vl)=0;
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/**Writes the contents of the renderer to a configuration file
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@ return true in case of success*/
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virtual bool writeXML( QDomNode & layer_node, QDomDocument & document, const QgsVectorLayer& vl ) const=0;
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/** Returns true, if attribute values are used by the renderer and false otherwise*/
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virtual bool needsAttributes() const=0;
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/**Returns a list with indexes of classification attributes*/
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virtual QList<int> classificationAttributes() const=0;
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/**Returns the renderers name*/
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virtual QString name() const=0;
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/**Return symbology items*/
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virtual const QList<QgsSymbol*> symbols() const=0;
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/**Returns a copy of the renderer (a deep copy on the heap)*/
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virtual QgsRenderer* clone() const=0;
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/** Change selection color */
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static void setSelectionColor(QColor color);
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/**Returns true if this renderer returns a pixmap in the render method (e.g. for point data or diagrams)*/
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virtual bool containsPixmap() const;
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/**Returns true if this renderer uses its own transparency settings, e.g. differentiated by classification.
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This is a hint for QgsVectorLayer to not use the transparency setting on layer level in this cases*/
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virtual bool usesTransparency() const;
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};
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