QgsSingleCategoryDiagramRenderer class

Renders the diagrams for all features with the same settings.

Base classes

class QgsDiagramRenderer: Evaluates and returns the diagram settings relating to a diagram for a specific feature.

QgsSingleCategoryDiagramRenderer() defaulted: Constructor for QgsSingleCategoryDiagramRenderer.

auto clone() const -> QgsSingleCategoryDiagramRenderer* override: Returns new instance that is equivalent to this one.
auto diagramAttributes() const -> QList<QString> override: Returns attribute indices needed for diagram rendering.
auto diagramSettings() const -> QList<QgsDiagramSettings> override: Returns list with all diagram settings in the renderer.
auto legendItems(QgsLayerTreeLayer* nodeLayer) const -> QList<QgsLayerTreeModelLegendNode*> override: Returns list of legend nodes for the diagram.
void readXml(const QDomElement& elem, const QgsReadWriteContext& context) override: Reads diagram state from a DOM element.
void writeXml(QDomElement& layerElem, QDomDocument& doc, const QgsReadWriteContext& context) const override: Writes diagram state to a DOM element.

auto diagramSettings(const QgsFeature& feature, const QgsRenderContext& c, QgsDiagramSettings& s) const -> bool override: Returns diagram settings for a feature (or false if the diagram for the feature is not to be rendered).
auto diagramSize(const QgsFeature& features, const QgsRenderContext& c) const -> QSizeF override: Returns size of the diagram (in painter units) or an invalid size in case of error.

Returns new instance that is equivalent to this one.

Returns list of legend nodes for the diagram.

Reads diagram state from a DOM element.

Subclasses should ensure that _readXml() is called by their readXml implementation to restore the general QgsDiagramRenderer settings.

Writes diagram state to a DOM element.

Subclasses should ensure that _writeXml() is called by their writeXml implementation to save the general QgsDiagramRenderer settings.

Returns diagram settings for a feature (or false if the diagram for the feature is not to be rendered).

Parameters
feature	the feature
c	render context
s	out: diagram settings for the feature

Used internally within renderDiagram()