QGIS API Documentation 3.40.0-Bratislava (b56115d8743)
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Public Member Functions | Static Public Member Functions | Protected Member Functions | Protected Attributes | List of all members
QgsSimpleMarkerSymbolLayerBase Class Referenceabstract

Abstract base class for simple marker symbol layers. More...

#include <qgsmarkersymbollayer.h>

Inheritance diagram for QgsSimpleMarkerSymbolLayerBase:
Inheritance graph
[legend]

Public Member Functions

 QgsSimpleMarkerSymbolLayerBase (Qgis::MarkerShape shape=Qgis::MarkerShape::Circle, double size=DEFAULT_SIMPLEMARKER_SIZE, double angle=DEFAULT_SIMPLEMARKER_ANGLE, Qgis::ScaleMethod scaleMethod=DEFAULT_SCALE_METHOD)
 Constructor for QgsSimpleMarkerSymbolLayerBase.
 
 ~QgsSimpleMarkerSymbolLayerBase () override
 
QRectF bounds (QPointF point, QgsSymbolRenderContext &context) override
 Returns the approximate bounding box of the marker symbol layer, taking into account any data defined overrides and offsets which are set for the marker layer.
 
void renderPoint (QPointF point, QgsSymbolRenderContext &context) override
 Renders a marker at the specified point.
 
void setShape (Qgis::MarkerShape shape)
 Sets the rendered marker shape.
 
Qgis::MarkerShape shape () const
 Returns the shape for the rendered marker symbol.
 
void startRender (QgsSymbolRenderContext &context) override
 Called before a set of rendering operations commences on the supplied render context.
 
void stopRender (QgsSymbolRenderContext &context) override
 Called after a set of rendering operations has finished on the supplied render context.
 
- Public Member Functions inherited from QgsMarkerSymbolLayer
 QgsMarkerSymbolLayer (const QgsMarkerSymbolLayer &other)=delete
 
double angle () const
 Returns the rotation angle for the marker, in degrees clockwise from north.
 
void drawPreviewIcon (QgsSymbolRenderContext &context, QSize size) override
 
virtual double dxfAngle (QgsSymbolRenderContext &context) const override
 Gets angle.
 
virtual double dxfSize (const QgsDxfExport &e, QgsSymbolRenderContext &context) const override
 Gets marker size.
 
HorizontalAnchorPoint horizontalAnchorPoint () const
 Returns the horizontal anchor point for positioning the symbol.
 
QgsMapUnitScale mapUnitScale () const override
 
QPointF offset () const
 Returns the marker's offset, which is the horizontal and vertical displacement which the rendered marker will have from the original feature's geometry.
 
const QgsMapUnitScaleoffsetMapUnitScale () const
 Returns the map unit scale for the symbol's offset.
 
Qgis::RenderUnit offsetUnit () const
 Returns the units for the symbol's offset.
 
QgsMarkerSymbolLayeroperator= (const QgsMarkerSymbolLayer &other)=delete
 
Qgis::RenderUnit outputUnit () const override
 Returns the units to use for sizes and widths within the symbol layer.
 
Qgis::ScaleMethod scaleMethod () const
 Returns the method to use for scaling the marker's size.
 
void setAngle (double angle)
 Sets the rotation angle for the marker.
 
void setHorizontalAnchorPoint (HorizontalAnchorPoint h)
 Sets the horizontal anchor point for positioning the symbol.
 
void setLineAngle (double lineAngle)
 Sets the line angle modification for the symbol's angle.
 
void setMapUnitScale (const QgsMapUnitScale &scale) override
 
void setOffset (QPointF offset)
 Sets the marker's offset, which is the horizontal and vertical displacement which the rendered marker should have from the original feature's geometry.
 
void setOffsetMapUnitScale (const QgsMapUnitScale &scale)
 Sets the map unit scale for the symbol's offset.
 
void setOffsetUnit (Qgis::RenderUnit unit)
 Sets the units for the symbol's offset.
 
void setOutputUnit (Qgis::RenderUnit unit) override
 Sets the units to use for sizes and widths within the symbol layer.
 
void setScaleMethod (Qgis::ScaleMethod scaleMethod)
 Sets the method to use for scaling the marker's size.
 
virtual void setSize (double size)
 Sets the symbol size.
 
void setSizeMapUnitScale (const QgsMapUnitScale &scale)
 Sets the map unit scale for the symbol's size.
 
void setSizeUnit (Qgis::RenderUnit unit)
 Sets the units for the symbol's size.
 
void setVerticalAnchorPoint (VerticalAnchorPoint v)
 Sets the vertical anchor point for positioning the symbol.
 
double size () const
 Returns the symbol size.
 
const QgsMapUnitScalesizeMapUnitScale () const
 Returns the map unit scale for the symbol's size.
 
Qgis::RenderUnit sizeUnit () const
 Returns the units for the symbol's size.
 
void toSld (QDomDocument &doc, QDomElement &element, const QVariantMap &props) const override
 Saves the symbol layer as SLD.
 
VerticalAnchorPoint verticalAnchorPoint () const
 Returns the vertical anchor point for positioning the symbol.
 
virtual void writeSldMarker (QDomDocument &doc, QDomElement &element, const QVariantMap &props) const
 Writes the symbol layer definition as a SLD XML element.
 
- 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.
 
virtual QgsSymbolLayerclone () const =0
 Shall be reimplemented by subclasses to create a deep copy of the instance.
 
virtual QColor color () const
 Returns the "representative" color of the symbol layer.
 
QgsPropertyCollectiondataDefinedProperties ()
 Returns a reference to the symbol layer's property collection, used for data defined overrides.
 
const QgsPropertyCollectiondataDefinedProperties () const
 Returns a reference to the symbol layer's property collection, used for data defined overrides.
 
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 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.
 
virtual bool hasDataDefinedProperties () const
 Returns true if the symbol layer (or any of its sub-symbols) contains data defined properties.
 
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.
 
virtual bool isCompatibleWithSymbol (QgsSymbol *symbol) const
 Returns if the layer can be used below the specified symbol.
 
bool isLocked () const
 Returns true if the symbol layer colors are locked and the layer will ignore any symbol-level color changes.
 
virtual QString layerType () const =0
 Returns a string that represents this layer type.
 
virtual QList< QgsSymbolLayerReferencemasks () const
 Returns masks defined by this symbol layer.
 
virtual QString ogrFeatureStyle (double mmScaleFactor, double mapUnitScaleFactor) const
 
QgsSymbolLayeroperator= (const QgsSymbolLayer &other)=delete
 
QgsPaintEffectpaintEffect () 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.
 
virtual QVariantMap properties () const =0
 Should be reimplemented by subclasses to return a string map that contains the configuration information for the symbol layer.
 
int renderingPass () const
 Specifies the rendering pass in which this symbol layer should be rendered.
 
virtual void setColor (const QColor &color)
 Sets the "representative" color for the symbol layer.
 
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.
 
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.
 
virtual bool setSubSymbol (QgsSymbol *symbol)
 Sets layer's subsymbol. takes ownership of the passed symbol.
 
void setUserFlags (Qgis::SymbolLayerUserFlags flags)
 Sets user-controlled flags which control the symbol layer's behavior.
 
virtual void startFeatureRender (const QgsFeature &feature, QgsRenderContext &context)
 Called before the layer will be rendered for a particular feature.
 
virtual void stopFeatureRender (const QgsFeature &feature, QgsRenderContext &context)
 Called after the layer has been rendered for a particular feature.
 
virtual QColor strokeColor () const
 Returns the stroke color for the symbol layer.
 
virtual QgsSymbolsubSymbol ()
 Returns the symbol's sub symbol, if present.
 
Qgis::SymbolType type () const
 
virtual QSet< QString > usedAttributes (const QgsRenderContext &context) const
 Returns the set of attributes referenced by the layer.
 
Qgis::SymbolLayerUserFlags userFlags () const
 Returns user-controlled flags which control the symbol layer's behavior.
 
virtual bool usesMapUnits () const
 Returns true if the symbol layer has any components which use map unit based sizes.
 
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 QList< Qgis::MarkerShapeavailableShapes ()
 Returns a list of all available shape types.
 
static Qgis::MarkerShape decodeShape (const QString &name, bool *ok=nullptr)
 Attempts to decode a string representation of a shape name to the corresponding shape.
 
static QString encodeShape (Qgis::MarkerShape shape)
 Encodes a shape to its string representation.
 
static bool shapeIsFilled (Qgis::MarkerShape shape)
 Returns true if a symbol shape has a fill.
 
- Static Public Member Functions inherited from QgsSymbolLayer
static const QgsPropertiesDefinitionpropertyDefinitions ()
 Returns the symbol layer property definitions.
 

Protected Member Functions

void calculateOffsetAndRotation (QgsSymbolRenderContext &context, double scaledSize, bool &hasDataDefinedRotation, QPointF &offset, double &angle) const
 Calculates the marker offset and rotation.
 
double calculateSize (QgsSymbolRenderContext &context, bool &hasDataDefinedSize) const
 Calculates the desired size of the marker, considering data defined size overrides.
 
bool prepareMarkerPath (Qgis::MarkerShape symbol)
 Prepares the layer for drawing the specified shape (QPainterPath version)
 
bool prepareMarkerShape (Qgis::MarkerShape shape)
 Prepares the layer for drawing the specified shape (QPolygonF version)
 
bool shapeToPolygon (Qgis::MarkerShape shape, QPolygonF &polygon) const
 Creates a polygon representing the specified shape.
 
- Protected Member Functions inherited from QgsMarkerSymbolLayer
 QgsMarkerSymbolLayer (bool locked=false)
 Constructor for QgsMarkerSymbolLayer.
 
void markerOffset (QgsSymbolRenderContext &context, double &offsetX, double &offsetY) const
 Calculates the required marker offset, including both the symbol offset and any displacement required to align with the marker's anchor point.
 
void markerOffset (QgsSymbolRenderContext &context, double width, double height, double &offsetX, double &offsetY) const
 Calculates the required marker offset, including both the symbol offset and any displacement required to align with the marker's anchor point.
 
void markerOffset (QgsSymbolRenderContext &context, double width, double height, Qgis::RenderUnit widthUnit, Qgis::RenderUnit heightUnit, double &offsetX, double &offsetY, const QgsMapUnitScale &widthMapUnitScale, const QgsMapUnitScale &heightMapUnitScale) const
 
- 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

QPainterPath mPath
 Painter path representing shape. If mPolygon is empty then the shape is stored in mPath.
 
QPolygonF mPolygon
 Polygon of points in shape. If polygon is empty then shape is using mPath.
 
Qgis::MarkerShape mShape
 Symbol shape.
 
- Protected Attributes inherited from QgsMarkerSymbolLayer
double mAngle = 0
 Marker rotation angle, in degrees clockwise from north.
 
HorizontalAnchorPoint mHorizontalAnchorPoint = HCenter
 Horizontal anchor point.
 
double mLineAngle = 0
 Line rotation angle (see setLineAngle() for details)
 
QPointF mOffset
 Marker offset.
 
QgsMapUnitScale mOffsetMapUnitScale
 Offset map unit scale.
 
Qgis::RenderUnit mOffsetUnit = Qgis::RenderUnit::Millimeters
 Offset units.
 
Qgis::ScaleMethod mScaleMethod = Qgis::ScaleMethod::ScaleDiameter
 Marker size scaling method.
 
double mSize = 2.0
 Marker size.
 
QgsMapUnitScale mSizeMapUnitScale
 Marker size map unit scale.
 
Qgis::RenderUnit mSizeUnit = Qgis::RenderUnit::Millimeters
 Marker size unit.
 
VerticalAnchorPoint mVerticalAnchorPoint = VCenter
 Vertical anchor point.
 
- 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< QgsPaintEffectmPaintEffect
 
int mRenderingPass = 0
 
Qgis::SymbolType mType
 
Qgis::SymbolLayerUserFlags mUserFlags
 User controlled flags.
 

Additional Inherited Members

- Public Types inherited from QgsMarkerSymbolLayer
enum  HorizontalAnchorPoint { Left , HCenter , Right }
 Symbol horizontal anchor points. More...
 
enum  VerticalAnchorPoint { Top , VCenter , Bottom }
 Symbol vertical anchor points. More...
 
- 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...
 
- Static Protected Member Functions inherited from QgsMarkerSymbolLayer
static QPointF _rotatedOffset (QPointF offset, double angle)
 Adjusts a marker offset to account for rotation.
 
- 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.
 

Detailed Description

Abstract base class for simple marker symbol layers.

Handles creation of the symbol shapes but leaves the actual drawing of the symbols to subclasses.

Definition at line 45 of file qgsmarkersymbollayer.h.

Constructor & Destructor Documentation

◆ QgsSimpleMarkerSymbolLayerBase()

QgsSimpleMarkerSymbolLayerBase::QgsSimpleMarkerSymbolLayerBase ( Qgis::MarkerShape  shape = Qgis::MarkerShape::Circle,
double  size = DEFAULT_SIMPLEMARKER_SIZE,
double  angle = DEFAULT_SIMPLEMARKER_ANGLE,
Qgis::ScaleMethod  scaleMethod = DEFAULT_SCALE_METHOD 
)

Constructor for QgsSimpleMarkerSymbolLayerBase.

Parameters
shapesymbol shape for markers
sizesymbol size (in mm)
anglesymbol rotation angle
scaleMethodscaling method for data defined scaling

Definition at line 97 of file qgsmarkersymbollayer.cpp.

◆ ~QgsSimpleMarkerSymbolLayerBase()

QgsSimpleMarkerSymbolLayerBase::~QgsSimpleMarkerSymbolLayerBase ( )
overridedefault

Member Function Documentation

◆ availableShapes()

QList< Qgis::MarkerShape > QgsSimpleMarkerSymbolLayerBase::availableShapes ( )
static

Returns a list of all available shape types.

Definition at line 53 of file qgsmarkersymbollayer.cpp.

◆ bounds()

QRectF QgsSimpleMarkerSymbolLayerBase::bounds ( QPointF  point,
QgsSymbolRenderContext context 
)
overridevirtual

Returns the approximate bounding box of the marker symbol layer, taking into account any data defined overrides and offsets which are set for the marker layer.

Returns
approximate symbol bounds, in painter units

Implements QgsMarkerSymbolLayer.

Definition at line 292 of file qgsmarkersymbollayer.cpp.

◆ calculateOffsetAndRotation()

void QgsSimpleMarkerSymbolLayerBase::calculateOffsetAndRotation ( QgsSymbolRenderContext context,
double  scaledSize,
bool &  hasDataDefinedRotation,
QPointF &  offset,
double &  angle 
) const
protected

Calculates the marker offset and rotation.

Parameters
contextsymbol render context
scaledSizesize of symbol to render
hasDataDefinedRotationwill be set to true if marker has data defined rotation
offsetwill be set to calculated marker offset (in painter units)
anglewill be set to calculated marker angle

Definition at line 910 of file qgsmarkersymbollayer.cpp.

◆ calculateSize()

double QgsSimpleMarkerSymbolLayerBase::calculateSize ( QgsSymbolRenderContext context,
bool &  hasDataDefinedSize 
) const
protected

Calculates the desired size of the marker, considering data defined size overrides.

Parameters
contextsymbol render context
hasDataDefinedSizewill be set to true if marker uses data defined sizes
Returns
marker size, in original size units

Definition at line 882 of file qgsmarkersymbollayer.cpp.

◆ decodeShape()

Qgis::MarkerShape QgsSimpleMarkerSymbolLayerBase::decodeShape ( const QString &  name,
bool *  ok = nullptr 
)
static

Attempts to decode a string representation of a shape name to the corresponding shape.

Parameters
nameencoded shape name
okif specified, will be set to true if shape was successfully decoded
Returns
decoded name
See also
encodeShape()

Definition at line 318 of file qgsmarkersymbollayer.cpp.

◆ encodeShape()

QString QgsSimpleMarkerSymbolLayerBase::encodeShape ( Qgis::MarkerShape  shape)
static

Encodes a shape to its string representation.

Parameters
shapeshape to encode
Returns
encoded string
See also
decodeShape()

Definition at line 404 of file qgsmarkersymbollayer.cpp.

◆ prepareMarkerPath()

bool QgsSimpleMarkerSymbolLayerBase::prepareMarkerPath ( Qgis::MarkerShape  symbol)
protected

Prepares the layer for drawing the specified shape (QPainterPath version)

Definition at line 775 of file qgsmarkersymbollayer.cpp.

◆ prepareMarkerShape()

bool QgsSimpleMarkerSymbolLayerBase::prepareMarkerShape ( Qgis::MarkerShape  shape)
protected

Prepares the layer for drawing the specified shape (QPolygonF version)

Definition at line 486 of file qgsmarkersymbollayer.cpp.

◆ renderPoint()

void QgsSimpleMarkerSymbolLayerBase::renderPoint ( QPointF  point,
QgsSymbolRenderContext context 
)
overridevirtual

Renders a marker at the specified point.

Derived classes must implement this to handle drawing the point.

Parameters
pointposition at which to render point, in painter units
contextsymbol render context

Implements QgsMarkerSymbolLayer.

Definition at line 206 of file qgsmarkersymbollayer.cpp.

◆ setShape()

void QgsSimpleMarkerSymbolLayerBase::setShape ( Qgis::MarkerShape  shape)
inline

Sets the rendered marker shape.

Parameters
shapenew marker shape
See also
shape()

Definition at line 85 of file qgsmarkersymbollayer.h.

◆ shape()

Qgis::MarkerShape QgsSimpleMarkerSymbolLayerBase::shape ( ) const
inline

Returns the shape for the rendered marker symbol.

See also
setShape()

Definition at line 78 of file qgsmarkersymbollayer.h.

◆ shapeIsFilled()

bool QgsSimpleMarkerSymbolLayerBase::shapeIsFilled ( Qgis::MarkerShape  shape)
static

Returns true if a symbol shape has a fill.

Parameters
shapeshape to test
Returns
true if shape uses a fill, or false if shape uses lines only

Definition at line 110 of file qgsmarkersymbollayer.cpp.

◆ shapeToPolygon()

bool QgsSimpleMarkerSymbolLayerBase::shapeToPolygon ( Qgis::MarkerShape  shape,
QPolygonF &  polygon 
) const
protected

Creates a polygon representing the specified shape.

Parameters
shapeshape to create
polygondestination polygon for shape
Returns
true if shape was successfully stored in polygon

Definition at line 491 of file qgsmarkersymbollayer.cpp.

◆ startRender()

void QgsSimpleMarkerSymbolLayerBase::startRender ( QgsSymbolRenderContext context)
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.

See also
startFeatureRender()
stopRender()

Reimplemented from QgsMarkerSymbolLayer.

Definition at line 158 of file qgsmarkersymbollayer.cpp.

◆ stopRender()

void QgsSimpleMarkerSymbolLayerBase::stopRender ( QgsSymbolRenderContext context)
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.

See also
startRender()
stopFeatureRender()

Reimplemented from QgsMarkerSymbolLayer.

Definition at line 201 of file qgsmarkersymbollayer.cpp.

Member Data Documentation

◆ mPath

QPainterPath QgsSimpleMarkerSymbolLayerBase::mPath
protected

Painter path representing shape. If mPolygon is empty then the shape is stored in mPath.

Definition at line 152 of file qgsmarkersymbollayer.h.

◆ mPolygon

QPolygonF QgsSimpleMarkerSymbolLayerBase::mPolygon
protected

Polygon of points in shape. If polygon is empty then shape is using mPath.

Definition at line 149 of file qgsmarkersymbollayer.h.

◆ mShape

Qgis::MarkerShape QgsSimpleMarkerSymbolLayerBase::mShape
protected

Symbol shape.

Definition at line 155 of file qgsmarkersymbollayer.h.


The documentation for this class was generated from the following files: