QGIS API Documentation 3.40.0-Bratislava (b56115d8743)
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A fill symbol layer which places markers at random locations within polygons. More...
#include <qgsfillsymbollayer.h>
Public Member Functions | |
QgsRandomMarkerFillSymbolLayer (int pointCount=10, Qgis::PointCountMethod method=Qgis::PointCountMethod::Absolute, double densityArea=250.0, unsigned long seed=0) | |
Constructor for QgsRandomMarkerFillSymbolLayer, with the specified pointCount. | |
~QgsRandomMarkerFillSymbolLayer () override | |
bool | canCauseArtifactsBetweenAdjacentTiles () const override |
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. | |
bool | clipPoints () const |
Returns true if point markers should be clipped to the polygon boundary. | |
QgsRandomMarkerFillSymbolLayer * | 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. | |
Qgis::PointCountMethod | countMethod () const |
Returns the count method used to randomly fill the polygon. | |
double | densityArea () const |
Returns the density area used to count the number of points to randomly fill the polygon. | |
Qgis::RenderUnit | densityAreaUnit () const |
Returns the units for the density area. | |
const QgsMapUnitScale & | densityAreaUnitScale () const |
Returns the map scale for the density area. | |
bool | hasDataDefinedProperties () const override |
Returns true if the symbol layer (or any of its sub-symbols) contains data defined properties. | |
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. | |
int | pointCount () const |
Returns the count of random points to render in the fill. | |
QVariantMap | properties () const override |
Should be reimplemented by subclasses to return a string map that contains the configuration information for the symbol layer. | |
void | renderPolygon (const QPolygonF &points, const QVector< QPolygonF > *rings, QgsSymbolRenderContext &context) override |
Renders the fill symbol layer for the polygon whose outer ring is defined by points, using the given render context. | |
unsigned long | seed () const |
Returns the random number seed to use when generating points, or 0 if a truly random sequence will be used (causing points to appear in different locations with every map refresh). | |
void | setClipPoints (bool clipped) |
Sets whether point markers should be clipped to the polygon boundary. | |
void | setColor (const QColor &color) override |
Sets the "representative" color for the symbol layer. | |
void | setCountMethod (Qgis::PointCountMethod method) |
Sets the count method used to randomly fill the polygon. | |
void | setDensityArea (double area) |
Sets the density area used to count the number of points to randomly fill the polygon. | |
void | setDensityAreaUnit (Qgis::RenderUnit unit) |
Sets the units for the density area. | |
void | setDensityAreaUnitScale (const QgsMapUnitScale &scale) |
Sets the map scale for the density area. | |
void | setMapUnitScale (const QgsMapUnitScale &scale) override |
void | setOutputUnit (Qgis::RenderUnit unit) override |
Sets the units to use for sizes and widths within the symbol layer. | |
void | setPointCount (int count) |
Sets the count of random points to render in the fill. | |
void | setSeed (unsigned long seed) |
Sets the random number seed to use when generating points, or 0 if a truly random sequence will be used on every rendering (causing points to appear in different locations with every map refresh). | |
bool | setSubSymbol (QgsSymbol *symbol) FINAL |
Sets layer's subsymbol. takes ownership of the passed symbol. | |
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. | |
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 QgsFillSymbolLayer | |
QgsFillSymbolLayer (const QgsFillSymbolLayer &other)=delete | |
double | angle () const |
Returns the rotation angle of the fill symbol, in degrees clockwise. | |
void | drawPreviewIcon (QgsSymbolRenderContext &context, QSize size) override |
QgsFillSymbolLayer & | operator= (const QgsFillSymbolLayer &other)=delete |
void | setAngle (double angle) |
Sets the rotation angle of the pattern, in degrees clockwise. | |
virtual QImage | toTiledPatternImage () const |
Renders the symbol layer as an image that can be used as a seamless pattern fill for polygons, this method is used by SLD export to generate image tiles for ExternalGraphic polygon fills. | |
Public Member Functions inherited from QgsSymbolLayer | |
QgsSymbolLayer (const QgsSymbolLayer &other)=delete | |
virtual | ~QgsSymbolLayer () |
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. | |
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 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. | |
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=QVariantMap()) |
Creates a new QgsRandomMarkerFillSymbolLayer using the specified properties map containing symbol properties (see properties()). | |
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 QgsFillSymbolLayer | |
QgsFillSymbolLayer (bool locked=false) | |
void | _renderPolygon (QPainter *p, const QPolygonF &points, const QVector< QPolygonF > *rings, QgsSymbolRenderContext &context) |
Default method to render polygon. | |
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 QgsFillSymbolLayer | |
double | mAngle = 0.0 |
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 fill symbol layer which places markers at random locations within polygons.
Definition at line 2295 of file qgsfillsymbollayer.h.
QgsRandomMarkerFillSymbolLayer::QgsRandomMarkerFillSymbolLayer | ( | int | pointCount = 10 , |
Qgis::PointCountMethod | method = Qgis::PointCountMethod::Absolute , |
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double | densityArea = 250.0 , |
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unsigned long | seed = 0 |
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Constructor for QgsRandomMarkerFillSymbolLayer, with the specified pointCount.
Optionally a specific random number seed can be used when generating points. A seed of 0 indicates that a truly random sequence will be used on every rendering, causing points to appear in different locations with every map refresh.
Definition at line 5512 of file qgsfillsymbollayer.cpp.
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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.
The default implementation returns false
.
Reimplemented from QgsSymbolLayer.
Definition at line 5750 of file qgsfillsymbollayer.cpp.
bool QgsRandomMarkerFillSymbolLayer::clipPoints | ( | ) | const |
Returns true
if point markers should be clipped to the polygon boundary.
Definition at line 5812 of file qgsfillsymbollayer.cpp.
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overridevirtual |
Shall be reimplemented by subclasses to create a deep copy of the instance.
Implements QgsSymbolLayer.
Definition at line 5736 of file qgsfillsymbollayer.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 5568 of file qgsfillsymbollayer.cpp.
Qgis::PointCountMethod QgsRandomMarkerFillSymbolLayer::countMethod | ( | ) | const |
Returns the count method used to randomly fill the polygon.
Definition at line 5822 of file qgsfillsymbollayer.cpp.
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static |
Creates a new QgsRandomMarkerFillSymbolLayer using the specified properties map containing symbol properties (see properties()).
Caller takes ownership of the returned symbol layer.
Definition at line 5523 of file qgsfillsymbollayer.cpp.
double QgsRandomMarkerFillSymbolLayer::densityArea | ( | ) | const |
Returns the density area used to count the number of points to randomly fill the polygon.
Only used when the count method is set to QgsRandomMarkerFillSymbolLayer::DensityBasedCount.
Units are specified by setDensityAreaUnit().
Definition at line 5832 of file qgsfillsymbollayer.cpp.
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Returns the units for the density area.
Definition at line 2427 of file qgsfillsymbollayer.h.
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Returns the map scale for the density area.
Definition at line 2444 of file qgsfillsymbollayer.h.
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Returns true
if the symbol layer (or any of its sub-symbols) contains data defined properties.
Reimplemented from QgsSymbolLayer.
Definition at line 5783 of file qgsfillsymbollayer.cpp.
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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 5557 of file qgsfillsymbollayer.cpp.
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Reimplemented from QgsSymbolLayer.
Definition at line 5901 of file qgsfillsymbollayer.cpp.
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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 5875 of file qgsfillsymbollayer.cpp.
int QgsRandomMarkerFillSymbolLayer::pointCount | ( | ) | const |
Returns the count of random points to render in the fill.
Definition at line 5792 of file qgsfillsymbollayer.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 5723 of file qgsfillsymbollayer.cpp.
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overridevirtual |
Renders the fill symbol layer for the polygon whose outer ring is defined by points, using the given render context.
The rings argument optionally specifies a list of polygon rings to render as holes.
Implements QgsFillSymbolLayer.
Definition at line 5584 of file qgsfillsymbollayer.cpp.
unsigned long QgsRandomMarkerFillSymbolLayer::seed | ( | ) | const |
Returns the random number seed to use when generating points, or 0 if a truly random sequence will be used (causing points to appear in different locations with every map refresh).
Definition at line 5802 of file qgsfillsymbollayer.cpp.
void QgsRandomMarkerFillSymbolLayer::setClipPoints | ( | bool | clipped | ) |
Sets whether point markers should be clipped to the polygon boundary.
Definition at line 5817 of file qgsfillsymbollayer.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 5562 of file qgsfillsymbollayer.cpp.
void QgsRandomMarkerFillSymbolLayer::setCountMethod | ( | Qgis::PointCountMethod | method | ) |
Sets the count method used to randomly fill the polygon.
Definition at line 5827 of file qgsfillsymbollayer.cpp.
void QgsRandomMarkerFillSymbolLayer::setDensityArea | ( | double | area | ) |
Sets the density area used to count the number of points to randomly fill the polygon.
Definition at line 5837 of file qgsfillsymbollayer.cpp.
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inline |
Sets the units for the density area.
unit | width units |
Definition at line 2421 of file qgsfillsymbollayer.h.
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Sets the map scale for the density area.
scale | density area map unit scale |
Definition at line 2436 of file qgsfillsymbollayer.h.
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overridevirtual |
Reimplemented from QgsSymbolLayer.
Definition at line 5893 of file qgsfillsymbollayer.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 5866 of file qgsfillsymbollayer.cpp.
void QgsRandomMarkerFillSymbolLayer::setPointCount | ( | int | count | ) |
Sets the count of random points to render in the fill.
Definition at line 5797 of file qgsfillsymbollayer.cpp.
void QgsRandomMarkerFillSymbolLayer::setSeed | ( | unsigned long | seed | ) |
Sets the random number seed to use when generating points, or 0 if a truly random sequence will be used on every rendering (causing points to appear in different locations with every map refresh).
Definition at line 5807 of file qgsfillsymbollayer.cpp.
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Sets layer's subsymbol. takes ownership of the passed symbol.
Reimplemented from QgsSymbolLayer.
Definition at line 5760 of file qgsfillsymbollayer.cpp.
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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 5842 of file qgsfillsymbollayer.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 5573 of file qgsfillsymbollayer.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 5850 of file qgsfillsymbollayer.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 5579 of file qgsfillsymbollayer.cpp.
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overridevirtual |
Returns the symbol's sub symbol, if present.
Reimplemented from QgsSymbolLayer.
Definition at line 5755 of file qgsfillsymbollayer.cpp.
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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 5773 of file qgsfillsymbollayer.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 5884 of file qgsfillsymbollayer.cpp.