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82 lines
3.7 KiB
Plaintext
82 lines
3.7 KiB
Plaintext
class QgsDiagram
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{
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%TypeHeaderCode
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#include <qgsdiagram.h>
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%End
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public:
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virtual ~QgsDiagram();
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/** Returns an instance that is equivalent to this one
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* @note added in 2.4 */
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virtual QgsDiagram *clone() const = 0 /Factory/;
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void clearCache();
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/** Returns a prepared expression for the specified context.
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* @param expression expression string
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* @param context expression context
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* @note added in QGIS 2.12
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*/
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QgsExpression *getExpression( const QString &expression, const QgsExpressionContext &context );
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/** Draws the diagram at the given position (in pixel coordinates)*/
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virtual void renderDiagram( const QgsFeature &feature, QgsRenderContext &c, const QgsDiagramSettings &s, QPointF position ) = 0;
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virtual QString diagramName() const = 0;
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/** Returns the size in map units the diagram will use to render.*/
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virtual QSizeF diagramSize( const QgsAttributes &attributes, const QgsRenderContext &c, const QgsDiagramSettings &s ) = 0;
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/** Returns the size in map units the diagram will use to render. Interpolate size*/
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virtual QSizeF diagramSize( const QgsFeature &feature, const QgsRenderContext &c, const QgsDiagramSettings &s, const QgsDiagramInterpolationSettings &is ) = 0;
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/** Returns the size of the legend item for the diagram corresponding to a specified value.
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* @param value value to return legend item size for
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* @param s diagram settings
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* @param is interpolation settings
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* @note added in QGIS 2.16
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*/
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virtual double legendSize( double value, const QgsDiagramSettings &s, const QgsDiagramInterpolationSettings &is ) const = 0;
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protected:
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QgsDiagram();
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QgsDiagram( const QgsDiagram &other );
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/** Changes the pen width to match the current settings and rendering context
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* @param pen The pen to modify
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* @param s The settings that specify the pen width
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* @param c The rendering specifying the proper scale units for pixel conversion
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*/
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void setPenWidth( QPen &pen, const QgsDiagramSettings &s, const QgsRenderContext &c );
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/** Calculates a size to match the current settings and rendering context
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* @param size The size to convert
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* @param s The settings that specify the size type
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* @param c The rendering specifying the proper scale units for pixel conversion
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*
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* @return The converted size for rendering
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*/
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QSizeF sizePainterUnits( QSizeF size, const QgsDiagramSettings &s, const QgsRenderContext &c );
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/** Calculates a length to match the current settings and rendering context
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* @param l The length to convert
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* @param s Unused
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* @param c The rendering specifying the proper scale units for pixel conversion
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*
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* @return The converted length for rendering
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*/
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double sizePainterUnits( double l, const QgsDiagramSettings &s, const QgsRenderContext &c );
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/** Calculates a size to match the current settings and rendering context
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* @param s The settings that contain the font size and size type
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* @param c The rendering specifying the proper scale units for pixel conversion
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*
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* @return The properly scaled font for rendering
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*/
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QFont scaledFont( const QgsDiagramSettings &s, const QgsRenderContext &c );
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/** Returns the scaled size of a diagram for a value, respecting the specified diagram interpolation settings.
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* @param value value to calculate corresponding circular size for
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* @param s diagram settings
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* @param is interpolation settings
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* @note added in QGIS 2.16
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*/
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QSizeF sizeForValue( double value, const QgsDiagramSettings &s, const QgsDiagramInterpolationSettings &is ) const;
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};
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