QGIS API Documentation 3.36.0-Maidenhead (09951dc0acf)
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#include <qgssinglesymbolrenderer.h>
Public Member Functions | |
QgsSingleSymbolRenderer (QgsSymbol *symbol) | |
Constructor for QgsSingleSymbolRenderer. | |
~QgsSingleSymbolRenderer () override | |
bool | accept (QgsStyleEntityVisitorInterface *visitor) const override |
Accepts the specified symbology visitor, causing it to visit all symbols associated with the renderer. | |
QgsFeatureRenderer::Capabilities | capabilities () override |
Returns details about internals of this renderer. | |
QgsSingleSymbolRenderer * | clone () const override |
Create a deep copy of this renderer. | |
QgsDataDefinedSizeLegend * | dataDefinedSizeLegend () const |
Returns configuration of appearance of legend when using data-defined size for marker symbols. | |
QString | dump () const override |
Returns debug information about this renderer. | |
QSet< QString > | legendKeysForFeature (const QgsFeature &feature, QgsRenderContext &context) const override |
Returns legend keys matching a specified feature. | |
QString | legendKeyToExpression (const QString &key, QgsVectorLayer *layer, bool &ok) const override |
Attempts to convert the specified legend rule key to a QGIS expression matching the features displayed using that key. | |
QgsLegendSymbolList | legendSymbolItems () const override |
Returns a list of symbology items for the legend. | |
QgsSymbol * | originalSymbolForFeature (const QgsFeature &feature, QgsRenderContext &context) const override |
Returns symbol for feature. | |
QDomElement | save (QDomDocument &doc, const QgsReadWriteContext &context) override |
Stores renderer properties to an XML element. | |
void | setDataDefinedSizeLegend (QgsDataDefinedSizeLegend *settings) |
Configures appearance of legend when renderer is configured to use data-defined size for marker symbols. | |
void | setLegendSymbolItem (const QString &key, QgsSymbol *symbol) override |
Sets the symbol to be used for a legend symbol item. | |
void | setSymbol (QgsSymbol *s) |
Sets the symbol which will be rendered for every feature. | |
void | startRender (QgsRenderContext &context, const QgsFields &fields) override |
Must be called when a new render cycle is started. | |
void | stopRender (QgsRenderContext &context) override |
Must be called when a render cycle has finished, to allow the renderer to clean up. | |
QgsSymbol * | symbol () const |
Returns the symbol which will be rendered for every feature. | |
QgsSymbol * | symbolForFeature (const QgsFeature &feature, QgsRenderContext &context) const override |
To be overridden. | |
QgsSymbolList | symbols (QgsRenderContext &context) const override |
Returns list of symbols used by the renderer. | |
void | toSld (QDomDocument &doc, QDomElement &element, const QVariantMap &props=QVariantMap()) const override |
used from subclasses to create SLD Rule elements following SLD v1.1 specs | |
QSet< QString > | usedAttributes (const QgsRenderContext &context) const override |
Returns a list of attributes required by this renderer. | |
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virtual | ~QgsFeatureRenderer () |
virtual bool | canSkipRender () |
Returns true if the renderer can be entirely skipped, i.e. | |
virtual void | checkLegendSymbolItem (const QString &key, bool state=true) |
Sets whether the legend symbology item with the specified ley should be checked. | |
void | copyRendererData (QgsFeatureRenderer *destRenderer) const |
Clones generic renderer data to another renderer. | |
virtual const QgsFeatureRenderer * | embeddedRenderer () const |
Returns the current embedded renderer (subrenderer) for this feature renderer. | |
virtual QString | filter (const QgsFields &fields=QgsFields()) |
If a renderer does not require all the features this method may be overridden and return an expression used as where clause. | |
virtual bool | filterNeedsGeometry () const |
Returns true if this renderer requires the geometry to apply the filter. | |
bool | forceRasterRender () const |
Returns whether the renderer must render as a raster. | |
virtual QString | legendClassificationAttribute () const |
If supported by the renderer, return classification attribute for the use in legend. | |
QSet< QString > | legendKeys () const |
Returns the set of all legend keys used by the renderer. | |
virtual bool | legendSymbolItemChecked (const QString &key) |
Returns true if the legend symbology item with the specified key is checked. | |
virtual bool | legendSymbolItemsCheckable () const |
Returns true if symbology items in legend are checkable. | |
virtual void | modifyRequestExtent (QgsRectangle &extent, QgsRenderContext &context) |
Allows for a renderer to modify the extent of a feature request prior to rendering. | |
QgsFeatureRequest::OrderBy | orderBy () const |
Gets the order in which features shall be processed by this renderer. | |
bool | orderByEnabled () const |
Returns whether custom ordering will be applied before features are processed by this renderer. | |
virtual QgsSymbolList | originalSymbolsForFeature (const QgsFeature &feature, QgsRenderContext &context) const |
Equivalent of originalSymbolsForFeature() call extended to support renderers that may use more symbols per feature - similar to symbolsForFeature() | |
QgsPaintEffect * | paintEffect () const |
Returns the current paint effect for the renderer. | |
double | referenceScale () const |
Returns the symbology reference scale. | |
virtual bool | renderFeature (const QgsFeature &feature, QgsRenderContext &context, int layer=-1, bool selected=false, bool drawVertexMarker=false) |
Render a feature using this renderer in the given context. | |
virtual void | setEmbeddedRenderer (QgsFeatureRenderer *subRenderer) |
Sets an embedded renderer (subrenderer) for this feature renderer. | |
void | setForceRasterRender (bool forceRaster) |
Sets whether the renderer should be rendered to a raster destination. | |
void | setOrderBy (const QgsFeatureRequest::OrderBy &orderBy) |
Define the order in which features shall be processed by this renderer. | |
void | setOrderByEnabled (bool enabled) |
Sets whether custom ordering should be applied before features are processed by this renderer. | |
void | setPaintEffect (QgsPaintEffect *effect) |
Sets the current paint effect for the renderer. | |
void | setReferenceScale (double scale) |
Sets the symbology reference scale. | |
void | setUsingSymbolLevels (bool usingSymbolLevels) |
void | setVertexMarkerAppearance (Qgis::VertexMarkerType type, double size) |
Sets type and size of editing vertex markers for subsequent rendering. | |
virtual QgsSymbolList | symbolsForFeature (const QgsFeature &feature, QgsRenderContext &context) const |
Returns list of symbols used for rendering the feature. | |
QString | type () const |
virtual bool | usesEmbeddedSymbols () const |
Returns true if the renderer uses embedded symbols for features. | |
bool | usingSymbolLevels () const |
virtual bool | willRenderFeature (const QgsFeature &feature, QgsRenderContext &context) const |
Returns whether the renderer will render a feature or not. | |
virtual QDomElement | writeSld (QDomDocument &doc, const QString &styleName, const QVariantMap &props=QVariantMap()) const |
create the SLD UserStyle element following the SLD v1.1 specs with the given name | |
Static Public Member Functions | |
static QgsSingleSymbolRenderer * | convertFromRenderer (const QgsFeatureRenderer *renderer) |
Creates a new single symbol renderer from an existing renderer. | |
static QgsFeatureRenderer * | create (QDomElement &element, const QgsReadWriteContext &context) |
Creates a new single symbol renderer from an XML element, using the supplied read/write context. | |
static QgsFeatureRenderer * | createFromSld (QDomElement &element, Qgis::GeometryType geomType) |
Creates a new single symbol renderer from an SLD element. | |
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static QgsFeatureRenderer * | defaultRenderer (Qgis::GeometryType geomType) |
Returns a new renderer - used by default in vector layers. | |
static QgsFeatureRenderer * | load (QDomElement &symbologyElem, const QgsReadWriteContext &context) |
create a renderer from XML element | |
static QgsFeatureRenderer * | loadSld (const QDomNode &node, Qgis::GeometryType geomType, QString &errorMessage) |
Create a new renderer according to the information contained in the UserStyle element of a SLD style document. | |
Protected Attributes | |
std::unique_ptr< QgsDataDefinedSizeLegend > | mDataDefinedSizeLegend |
std::unique_ptr< QgsSymbol > | mSymbol |
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double | mCurrentVertexMarkerSize = 2 |
The current size of editing marker. | |
Qgis::VertexMarkerType | mCurrentVertexMarkerType = Qgis::VertexMarkerType::Cross |
The current type of editing marker. | |
bool | mForceRaster = false |
QgsFeatureRequest::OrderBy | mOrderBy |
bool | mOrderByEnabled = false |
QgsPaintEffect * | mPaintEffect = nullptr |
double | mReferenceScale = -1.0 |
QString | mType |
bool | mUsingSymbolLevels = false |
Additional Inherited Members | |
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enum | Capability { SymbolLevels = 1 , MoreSymbolsPerFeature = 1 << 2 , Filter = 1 << 3 , ScaleDependent = 1 << 4 } |
Used to specify details about a renderer. More... | |
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QgsFeatureRenderer (const QString &type) | |
void | renderFeatureWithSymbol (const QgsFeature &feature, QgsSymbol *symbol, QgsRenderContext &context, int layer, bool selected, bool drawVertexMarker) |
Render the feature with the symbol using context. | |
void | renderVertexMarker (QPointF pt, QgsRenderContext &context) |
render editing vertex marker at specified point | |
void | renderVertexMarkerPolygon (QPolygonF &pts, QList< QPolygonF > *rings, QgsRenderContext &context) |
render editing vertex marker for a polygon | |
void | renderVertexMarkerPolyline (QPolygonF &pts, QgsRenderContext &context) |
render editing vertex marker for a polyline | |
void | saveRendererData (QDomDocument &doc, QDomElement &element, const QgsReadWriteContext &context) |
Saves generic renderer data into the specified element. | |
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static QPointF | _getPoint (QgsRenderContext &context, const QgsPoint &point) |
Creates a point in screen coordinates from a wkb string in map coordinates. | |
static void | convertSymbolRotation (QgsSymbol *symbol, const QString &field) |
static void | convertSymbolSizeScale (QgsSymbol *symbol, Qgis::ScaleMethod method, const QString &field) |
Definition at line 29 of file qgssinglesymbolrenderer.h.
QgsSingleSymbolRenderer::QgsSingleSymbolRenderer | ( | QgsSymbol * | symbol | ) |
Constructor for QgsSingleSymbolRenderer.
The same symbol will be used to render every feature. Ownership of symbol is transferred to the renderer.
Definition at line 40 of file qgssinglesymbolrenderer.cpp.
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overridedefault |
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overridevirtual |
Accepts the specified symbology visitor, causing it to visit all symbols associated with the renderer.
Returns true
if the visitor should continue visiting other objects, or false
if visiting should be canceled.
Reimplemented from QgsFeatureRenderer.
Definition at line 89 of file qgssinglesymbolrenderer.cpp.
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inlineoverridevirtual |
Returns details about internals of this renderer.
E.g. if you only want to deal with visible features:
Reimplemented from QgsFeatureRenderer.
Definition at line 77 of file qgssinglesymbolrenderer.h.
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overridevirtual |
Create a deep copy of this renderer.
Should be implemented by all subclasses and generate a proper subclass.
Implements QgsFeatureRenderer.
Definition at line 115 of file qgssinglesymbolrenderer.cpp.
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static |
Creates a new single symbol renderer from an existing renderer.
nullptr
. Definition at line 350 of file qgssinglesymbolrenderer.cpp.
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static |
Creates a new single symbol renderer from an XML element, using the supplied read/write context.
The caller takes ownership of the returned renderer.
Definition at line 148 of file qgssinglesymbolrenderer.cpp.
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Creates a new single symbol renderer from an SLD element.
The geometry type for features to be rendered must be specified via the geomType argument.
The caller takes ownership of the returned renderer.
Definition at line 188 of file qgssinglesymbolrenderer.cpp.
QgsDataDefinedSizeLegend * QgsSingleSymbolRenderer::dataDefinedSizeLegend | ( | ) | const |
Returns configuration of appearance of legend when using data-defined size for marker symbols.
Will return nullptr
if the functionality is disabled.
Definition at line 393 of file qgssinglesymbolrenderer.cpp.
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overridevirtual |
Returns debug information about this renderer.
Reimplemented from QgsFeatureRenderer.
Definition at line 110 of file qgssinglesymbolrenderer.cpp.
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overridevirtual |
Returns legend keys matching a specified feature.
Reimplemented from QgsFeatureRenderer.
Definition at line 323 of file qgssinglesymbolrenderer.cpp.
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overridevirtual |
Attempts to convert the specified legend rule key to a QGIS expression matching the features displayed using that key.
key | legend key |
layer | associated vector layer |
ok | will be set to true if legend key was successfully converted to a filter expression |
Reimplemented from QgsFeatureRenderer.
Definition at line 330 of file qgssinglesymbolrenderer.cpp.
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overridevirtual |
Returns a list of symbology items for the legend.
Reimplemented from QgsFeatureRenderer.
Definition at line 304 of file qgssinglesymbolrenderer.cpp.
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overridevirtual |
Returns symbol for feature.
The difference compared to symbolForFeature() is that it returns original symbol which can be used as an identifier for renderer's rule - the former may return a temporary replacement of a symbol for use in rendering.
Reimplemented from QgsFeatureRenderer.
Definition at line 54 of file qgssinglesymbolrenderer.cpp.
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overridevirtual |
Stores renderer properties to an XML element.
Subclasses which override this method should call saveRendererData() as part of their implementation in order to store all common base class properties in the returned DOM element.
Reimplemented from QgsFeatureRenderer.
Definition at line 276 of file qgssinglesymbolrenderer.cpp.
void QgsSingleSymbolRenderer::setDataDefinedSizeLegend | ( | QgsDataDefinedSizeLegend * | settings | ) |
Configures appearance of legend when renderer is configured to use data-defined size for marker symbols.
This allows configuring which values (symbol sizes) should be shown in the legend, whether to display different symbol sizes collapsed in one legend node or separated across multiple legend nodes etc.
When renderer does not use data-defined size or does not use marker symbols, these settings will be ignored. Takes ownership of the passed settings objects. nullptr
is a valid input that disables data-defined size legend.
Definition at line 388 of file qgssinglesymbolrenderer.cpp.
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overridevirtual |
Sets the symbol to be used for a legend symbol item.
key | rule key for legend symbol |
symbol | new symbol for legend item. Ownership is transferred to renderer. |
Reimplemented from QgsFeatureRenderer.
Definition at line 344 of file qgssinglesymbolrenderer.cpp.
void QgsSingleSymbolRenderer::setSymbol | ( | QgsSymbol * | s | ) |
Sets the symbol which will be rendered for every feature.
Ownership of the symbol is transferred to the renderer.
Definition at line 104 of file qgssinglesymbolrenderer.cpp.
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overridevirtual |
Must be called when a new render cycle is started.
A call to startRender() must always be followed by a corresponding call to stopRender() after all features have been rendered.
context | Additional information passed to the renderer about the job which will be rendered |
fields | The fields available for rendering |
Reimplemented from QgsFeatureRenderer.
Definition at line 61 of file qgssinglesymbolrenderer.cpp.
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overridevirtual |
Must be called when a render cycle has finished, to allow the renderer to clean up.
Calls to stopRender() must always be preceded by a call to startRender().
Reimplemented from QgsFeatureRenderer.
Definition at line 71 of file qgssinglesymbolrenderer.cpp.
QgsSymbol * QgsSingleSymbolRenderer::symbol | ( | ) | const |
Returns the symbol which will be rendered for every feature.
Definition at line 99 of file qgssinglesymbolrenderer.cpp.
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overridevirtual |
To be overridden.
Must be called between startRender() and stopRender() calls.
feature | feature |
context | render context |
Implements QgsFeatureRenderer.
Definition at line 49 of file qgssinglesymbolrenderer.cpp.
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overridevirtual |
Returns list of symbols used by the renderer.
context | render context |
Reimplemented from QgsFeatureRenderer.
Definition at line 139 of file qgssinglesymbolrenderer.cpp.
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overridevirtual |
used from subclasses to create SLD Rule elements following SLD v1.1 specs
Reimplemented from QgsFeatureRenderer.
Definition at line 123 of file qgssinglesymbolrenderer.cpp.
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overridevirtual |
Returns a list of attributes required by this renderer.
Attributes not listed in here may not have been requested from the provider at rendering time.
Implements QgsFeatureRenderer.
Definition at line 81 of file qgssinglesymbolrenderer.cpp.
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protected |
Definition at line 118 of file qgssinglesymbolrenderer.h.
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protected |
Definition at line 117 of file qgssinglesymbolrenderer.h.