QGIS API Documentation 3.41.0-Master (092dc69654e)
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A symbol layer subclass which alters rendered feature shapes through the use of QGIS expressions. More...
#include <qgsgeometrygeneratorsymbollayer.h>
Public Member Functions | |
~QgsGeometryGeneratorSymbolLayer () override | |
QgsSymbolLayer * | clone () const override |
Shall be reimplemented by subclasses to create a deep copy of the instance. | |
QColor | color () const override |
Returns the "representative" color of the symbol layer. | |
void | drawPreviewIcon (QgsSymbolRenderContext &context, QSize size) override |
QString | geometryExpression () const |
Gets the expression to generate this geometry. | |
bool | hasDataDefinedProperties () const override |
Returns true if the symbol layer (or any of its sub-symbols) contains data defined properties. | |
bool | isCompatibleWithSymbol (QgsSymbol *symbol) const override |
Will always return true . | |
QString | layerType () const override |
Returns a string that represents this layer type. | |
QgsMapUnitScale | mapUnitScale () const override |
Qgis::RenderUnit | outputUnit () const override |
Returns the units to use for sizes and widths within the symbol layer. | |
QVariantMap | properties () const override |
Should be reimplemented by subclasses to return a string map that contains the configuration information for the symbol layer. | |
void | render (QgsSymbolRenderContext &context, Qgis::GeometryType geometryType=Qgis::GeometryType::Unknown, const QPolygonF *points=nullptr, const QVector< QPolygonF > *rings=nullptr) |
Will render this symbol layer using the context. | |
void | setColor (const QColor &color) override |
Sets the "representative" color for the symbol layer. | |
void | setGeometryExpression (const QString &exp) |
Set the expression to generate this geometry. | |
void | setOutputUnit (Qgis::RenderUnit unit) override |
Sets the units to use for sizes and widths within the symbol layer. | |
bool | setSubSymbol (QgsSymbol *symbol) override |
Sets layer's subsymbol. takes ownership of the passed symbol. | |
void | setSymbolType (Qgis::SymbolType symbolType) |
Set the type of symbol which should be created. | |
void | setUnits (Qgis::RenderUnit units) |
Sets the units for the geometry expression. | |
void | startFeatureRender (const QgsFeature &feature, QgsRenderContext &context) override |
Called before the layer will be rendered for a particular feature. | |
void | startRender (QgsSymbolRenderContext &context) override |
Called before a set of rendering operations commences on the supplied render context. | |
void | stopFeatureRender (const QgsFeature &feature, QgsRenderContext &context) override |
Called after the layer has been rendered for a particular feature. | |
void | stopRender (QgsSymbolRenderContext &context) override |
Called after a set of rendering operations has finished on the supplied render context. | |
QgsSymbol * | subSymbol () override |
Returns the symbol's sub symbol, if present. | |
Qgis::SymbolType | symbolType () const |
Access the symbol type. | |
Qgis::RenderUnit | units () const |
Returns the unit for the geometry expression. | |
QSet< QString > | usedAttributes (const QgsRenderContext &context) const override |
Returns the set of attributes referenced by the layer. | |
bool | usesMapUnits () const override |
Returns true if the symbol layer has any components which use map unit based sizes. | |
Public Member Functions inherited from QgsSymbolLayer | |
QgsSymbolLayer (const QgsSymbolLayer &other)=delete | |
virtual | ~QgsSymbolLayer () |
virtual bool | canCauseArtifactsBetweenAdjacentTiles () const |
Returns true if the symbol layer rendering can cause visible artifacts across a single feature when the feature is rendered as a series of adjacent map tiles each containing a portion of the feature's geometry. | |
QgsPropertyCollection & | dataDefinedProperties () |
Returns a reference to the symbol layer's property collection, used for data defined overrides. | |
const QgsPropertyCollection & | dataDefinedProperties () const |
Returns a reference to the symbol layer's property collection, used for data defined overrides. | |
virtual double | dxfAngle (QgsSymbolRenderContext &context) const |
Gets angle. | |
virtual QColor | dxfBrushColor (QgsSymbolRenderContext &context) const |
Gets brush/fill color. | |
virtual Qt::BrushStyle | dxfBrushStyle () const |
Gets brush/fill style. | |
virtual QColor | dxfColor (QgsSymbolRenderContext &context) const |
Gets color. | |
virtual QVector< qreal > | dxfCustomDashPattern (Qgis::RenderUnit &unit) const |
Gets dash pattern. | |
virtual double | dxfOffset (const QgsDxfExport &e, QgsSymbolRenderContext &context) const |
Gets offset. | |
virtual Qt::PenStyle | dxfPenStyle () const |
Gets pen style. | |
virtual double | dxfSize (const QgsDxfExport &e, QgsSymbolRenderContext &context) const |
Gets marker size. | |
virtual double | dxfWidth (const QgsDxfExport &e, QgsSymbolRenderContext &context) const |
Gets line width. | |
bool | enabled () const |
Returns true if symbol layer is enabled and will be drawn. | |
virtual double | estimateMaxBleed (const QgsRenderContext &context) const |
Returns the estimated maximum distance which the layer style will bleed outside the drawn shape when drawn in the specified /a context. | |
virtual QColor | fillColor () const |
Returns the fill color for the symbol layer. | |
virtual Qgis::SymbolLayerFlags | flags () const |
Returns flags which control the symbol layer's behavior. | |
QString | id () const |
Returns symbol layer identifier This id is unique in the whole project. | |
bool | installMasks (QgsRenderContext &context, bool recursive, const QRectF &rect=QRectF()) |
When rendering, install masks on context painter. | |
bool | isLocked () const |
Returns true if the symbol layer colors are locked and the layer will ignore any symbol-level color changes. | |
virtual QList< QgsSymbolLayerReference > | masks () const |
Returns masks defined by this symbol layer. | |
virtual QString | ogrFeatureStyle (double mmScaleFactor, double mapUnitScaleFactor) const |
QgsSymbolLayer & | operator= (const QgsSymbolLayer &other)=delete |
QgsPaintEffect * | paintEffect () const |
Returns the current paint effect for the layer. | |
virtual void | prepareExpressions (const QgsSymbolRenderContext &context) |
Prepares all data defined property expressions for evaluation. | |
virtual void | prepareMasks (const QgsSymbolRenderContext &context) |
Prepares all mask internal objects according to what is defined in context This should be called prior to calling startRender() method. | |
int | renderingPass () const |
Specifies the rendering pass in which this symbol layer should be rendered. | |
void | setDataDefinedProperties (const QgsPropertyCollection &collection) |
Sets the symbol layer's property collection, used for data defined overrides. | |
virtual void | setDataDefinedProperty (Property key, const QgsProperty &property) |
Sets a data defined property for the layer. | |
void | setEnabled (bool enabled) |
Sets whether symbol layer is enabled and should be drawn. | |
virtual void | setFillColor (const QColor &color) |
Sets the fill color for the symbol layer. | |
void | setId (const QString &id) |
Set symbol layer identifier This id has to be unique in the whole project. | |
void | setLocked (bool locked) |
Sets whether the layer's colors are locked. | |
virtual void | setMapUnitScale (const QgsMapUnitScale &scale) |
void | setPaintEffect (QgsPaintEffect *effect) |
Sets the current paint effect for the layer. | |
void | setRenderingPass (int renderingPass) |
Specifies the rendering pass in which this symbol layer should be rendered. | |
virtual void | setStrokeColor (const QColor &color) |
Sets the stroke color for the symbol layer. | |
void | setUserFlags (Qgis::SymbolLayerUserFlags flags) |
Sets user-controlled flags which control the symbol layer's behavior. | |
virtual QColor | strokeColor () const |
Returns the stroke color for the symbol layer. | |
virtual void | toSld (QDomDocument &doc, QDomElement &element, const QVariantMap &props) const |
Saves the symbol layer as SLD. | |
Qgis::SymbolType | type () const |
Qgis::SymbolLayerUserFlags | userFlags () const |
Returns user-controlled flags which control the symbol layer's behavior. | |
virtual bool | writeDxf (QgsDxfExport &e, double mmMapUnitScaleFactor, const QString &layerName, QgsSymbolRenderContext &context, QPointF shift=QPointF(0.0, 0.0)) const |
write as DXF | |
Static Public Member Functions | |
static QgsSymbolLayer * | create (const QVariantMap &properties) |
Creates the symbol layer. | |
Static Public Member Functions inherited from QgsSymbolLayer | |
static const QgsPropertiesDefinition & | propertyDefinitions () |
Returns the symbol layer property definitions. | |
Additional Inherited Members | |
Public Types inherited from QgsSymbolLayer | |
enum class | Property : int { Size = 0 , Angle , Name , FillColor , StrokeColor , StrokeWidth , StrokeStyle , Offset , Character , Width , Height , PreserveAspectRatio , FillStyle , JoinStyle , SecondaryColor , LineAngle , LineDistance , GradientType , CoordinateMode , GradientSpread , GradientReference1X , GradientReference1Y , GradientReference2X , GradientReference2Y , GradientReference1IsCentroid , GradientReference2IsCentroid , BlurRadius , ShapeburstUseWholeShape , ShapeburstMaxDistance , ShapeburstIgnoreRings , File , DistanceX , DistanceY , DisplacementX , DisplacementY , Opacity , CustomDash , CapStyle , Placement , Interval , OffsetAlongLine , AverageAngleLength , HorizontalAnchor , VerticalAnchor , LayerEnabled , ArrowWidth , ArrowStartWidth , ArrowHeadLength , ArrowHeadThickness , ArrowHeadType , ArrowType , OffsetX , OffsetY , PointCount , RandomSeed , ClipPoints , DensityArea , FontFamily , FontStyle , DashPatternOffset , TrimStart , TrimEnd , LineStartWidthValue , LineEndWidthValue , LineStartColorValue , LineEndColorValue , MarkerClipping , RandomOffsetX , RandomOffsetY , LineClipping , SkipMultiples , ShowMarker } |
Data definable properties. More... | |
Protected Member Functions inherited from QgsSymbolLayer | |
QgsSymbolLayer (Qgis::SymbolType type, bool locked=false) | |
Constructor for QgsSymbolLayer. | |
void | copyDataDefinedProperties (QgsSymbolLayer *destLayer) const |
Copies all data defined properties of this layer to another symbol layer. | |
void | copyPaintEffect (QgsSymbolLayer *destLayer) const |
Copies paint effect of this layer to another symbol layer. | |
void | removeMasks (QgsRenderContext &context, bool recursive) |
When rendering, remove previously installed masks from context painter if recursive is true masks are removed recursively for all children symbol layers. | |
void | restoreOldDataDefinedProperties (const QVariantMap &stringMap) |
Restores older data defined properties from string map. | |
bool | shouldRenderUsingSelectionColor (const QgsSymbolRenderContext &context) const |
Returns true if the symbol layer should be rendered using the selection color from the render context. | |
Protected Attributes inherited from QgsSymbolLayer | |
QPainterPath | mClipPath |
QColor | mColor |
QgsPropertyCollection | mDataDefinedProperties |
bool | mEnabled = true |
True if layer is enabled and should be drawn. | |
QgsFields | mFields |
QString | mId |
bool | mLocked = false |
std::unique_ptr< QgsPaintEffect > | mPaintEffect |
int | mRenderingPass = 0 |
Qgis::SymbolType | mType |
Qgis::SymbolLayerUserFlags | mUserFlags |
User controlled flags. | |
Static Protected Attributes inherited from QgsSymbolLayer | |
static const bool | SELECT_FILL_BORDER = false |
Whether fill styles for selected features also highlight symbol stroke. | |
static const bool | SELECT_FILL_STYLE = false |
Whether fill styles for selected features uses symbol layer style. | |
static const bool | SELECTION_IS_OPAQUE = true |
Whether styles for selected features ignore symbol alpha. | |
A symbol layer subclass which alters rendered feature shapes through the use of QGIS expressions.
Definition at line 32 of file qgsgeometrygeneratorsymbollayer.h.
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overridedefault |
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overridevirtual |
Shall be reimplemented by subclasses to create a deep copy of the instance.
Implements QgsSymbolLayer.
Definition at line 181 of file qgsgeometrygeneratorsymbollayer.cpp.
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overridevirtual |
Returns the "representative" color of the symbol layer.
Depending on the symbol layer type, this will have different meaning. For instance, a line symbol layer will generally return the stroke color of the layer, while a fill symbol layer will return the "fill" color instead of stroke.
Some symbol layer types will return an invalid QColor if they have no representative color associated (e.g. raster image based symbol layers).
Reimplemented from QgsSymbolLayer.
Definition at line 138 of file qgsgeometrygeneratorsymbollayer.cpp.
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static |
Creates the symbol layer.
Definition at line 31 of file qgsgeometrygeneratorsymbollayer.cpp.
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overridevirtual |
Implements QgsSymbolLayer.
Definition at line 222 of file qgsgeometrygeneratorsymbollayer.cpp.
QString QgsGeometryGeneratorSymbolLayer::geometryExpression | ( | ) | const |
Gets the expression to generate this geometry.
Definition at line 276 of file qgsgeometrygeneratorsymbollayer.cpp.
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overridevirtual |
Returns true
if the symbol layer (or any of its sub-symbols) contains data defined properties.
Reimplemented from QgsSymbolLayer.
Definition at line 313 of file qgsgeometrygeneratorsymbollayer.cpp.
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overridevirtual |
Will always return true
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This is a hybrid layer, it constructs its own geometry so it does not care about the geometry of its parents.
Reimplemented from QgsSymbolLayer.
Definition at line 321 of file qgsgeometrygeneratorsymbollayer.cpp.
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overridevirtual |
Returns a string that represents this layer type.
Used for serialization. Should match with the string used to register this symbol layer in the registry.
Implements QgsSymbolLayer.
Definition at line 67 of file qgsgeometrygeneratorsymbollayer.cpp.
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overridevirtual |
Reimplemented from QgsSymbolLayer.
Definition at line 170 of file qgsgeometrygeneratorsymbollayer.cpp.
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overridevirtual |
Returns the units to use for sizes and widths within the symbol layer.
Individual symbol layer subclasses will interpret this in different ways, e.g., a marker symbol layer may use it to specify the units for the marker size, while a line symbol layer may use it to specify the units for the line width.
Reimplemented from QgsSymbolLayer.
Definition at line 149 of file qgsgeometrygeneratorsymbollayer.cpp.
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overridevirtual |
Should be reimplemented by subclasses to return a string map that contains the configuration information for the symbol layer.
This is used to serialize a symbol layer perstistently.
Implements QgsSymbolLayer.
Definition at line 201 of file qgsgeometrygeneratorsymbollayer.cpp.
void QgsGeometryGeneratorSymbolLayer::render | ( | QgsSymbolRenderContext & | context, |
Qgis::GeometryType | geometryType = Qgis::GeometryType::Unknown , |
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const QPolygonF * | points = nullptr , |
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const QVector< QPolygonF > * | rings = nullptr |
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Will render this symbol layer using the context.
In comparison to other symbols there is no geometry passed in, since the geometry will be created based on information from the context which contains a QgsRenderContext which in turn contains an expression context which is available to the evaluated expression.
context | The rendering context which will be used to render and to construct a geometry. |
geometryType | type of original geometry being rendered by the parent symbol (since QGIS 3.22) |
points | optional list of original points which are being rendered by the parent symbol (since QGIS 3.22) |
rings | optional list of original rings which are being rendered by the parent symbol (since QGIS 3.22) |
Definition at line 384 of file qgsgeometrygeneratorsymbollayer.cpp.
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overridevirtual |
Sets the "representative" color for the symbol layer.
Depending on the symbol layer type, this will have different meaning. For instance, a line symbol layer will generally set the stroke color of the layer, while a fill symbol layer will set the "fill" color instead of stroke.
Reimplemented from QgsSymbolLayer.
Definition at line 519 of file qgsgeometrygeneratorsymbollayer.cpp.
void QgsGeometryGeneratorSymbolLayer::setGeometryExpression | ( | const QString & | exp | ) |
Set the expression to generate this geometry.
Definition at line 271 of file qgsgeometrygeneratorsymbollayer.cpp.
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overridevirtual |
Sets the units to use for sizes and widths within the symbol layer.
Individual symbol layer subclasses will interpret this in different ways, e.g., a marker symbol layer may use it to specify the units for the marker size, while a line symbol layer may use it to specify the units for the line width.
unit | output units |
Reimplemented from QgsSymbolLayer.
Definition at line 160 of file qgsgeometrygeneratorsymbollayer.cpp.
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overridevirtual |
Sets layer's subsymbol. takes ownership of the passed symbol.
Reimplemented from QgsSymbolLayer.
Definition at line 281 of file qgsgeometrygeneratorsymbollayer.cpp.
void QgsGeometryGeneratorSymbolLayer::setSymbolType | ( | Qgis::SymbolType | symbolType | ) |
Set the type of symbol which should be created.
Should match with the return type of the expression.
symbolType | The symbol type which shall be used below this symbol. |
Definition at line 72 of file qgsgeometrygeneratorsymbollayer.cpp.
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inline |
Sets the units for the geometry expression.
By default this is QgsUnitTypes::MapUnits, which means that the geometryExpression() will return geometries in the associated layer's CRS.
Definition at line 104 of file qgsgeometrygeneratorsymbollayer.h.
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overridevirtual |
Called before the layer will be rendered for a particular feature.
This is always followed by a call to stopFeatureRender() after the feature has been completely rendered (i.e. all parts have been rendered).
The default implementation does nothing.
Reimplemented from QgsSymbolLayer.
Definition at line 113 of file qgsgeometrygeneratorsymbollayer.cpp.
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overridevirtual |
Called before a set of rendering operations commences on the supplied render context.
This is always followed by a call to stopRender() after all rendering operations have been completed.
Subclasses can use this method to prepare for a set of rendering operations, e.g. by pre-evaluating paths or images to render, and performing other one-time optimisations.
Implements QgsSymbolLayer.
Definition at line 98 of file qgsgeometrygeneratorsymbollayer.cpp.
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overridevirtual |
Called after the layer has been rendered for a particular feature.
This is always preceded by a call to startFeatureRender() just before the feature will be rendered.
The default implementation does nothing.
Reimplemented from QgsSymbolLayer.
Definition at line 122 of file qgsgeometrygeneratorsymbollayer.cpp.
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overridevirtual |
Called after a set of rendering operations has finished on the supplied render context.
This is always preceded by a call to startRender() before all rendering operations are commenced.
Subclasses can use this method to cleanup after a set of rendering operations.
Implements QgsSymbolLayer.
Definition at line 107 of file qgsgeometrygeneratorsymbollayer.cpp.
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inlineoverridevirtual |
Returns the symbol's sub symbol, if present.
Reimplemented from QgsSymbolLayer.
Definition at line 106 of file qgsgeometrygeneratorsymbollayer.h.
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inline |
Access the symbol type.
This defines the type of geometry that is created by this generator.
Definition at line 56 of file qgsgeometrygeneratorsymbollayer.h.
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inline |
Returns the unit for the geometry expression.
By default this is QgsUnitTypes::MapUnits, which means that the geometryExpression() will return geometries in the associated layer's CRS.
Definition at line 93 of file qgsgeometrygeneratorsymbollayer.h.
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overridevirtual |
Returns the set of attributes referenced by the layer.
This includes attributes required by any data defined properties associated with the layer.
Reimplemented from QgsSymbolLayer.
Definition at line 306 of file qgsgeometrygeneratorsymbollayer.cpp.
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overridevirtual |
Returns true
if the symbol layer has any components which use map unit based sizes.
Reimplemented from QgsSymbolLayer.
Definition at line 127 of file qgsgeometrygeneratorsymbollayer.cpp.