QGIS API Documentation 3.39.0-Master (bca3cdb6021)
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Abstract base class for line symbol layers. More...
#include <qgssymbollayer.h>
Public Member Functions | |
QgsLineSymbolLayer (const QgsLineSymbolLayer &other)=delete | |
void | drawPreviewIcon (QgsSymbolRenderContext &context, QSize size) override |
double | dxfWidth (const QgsDxfExport &e, QgsSymbolRenderContext &context) const override |
Gets line width. | |
QgsMapUnitScale | mapUnitScale () const override |
double | offset () const |
Returns the line's offset. | |
const QgsMapUnitScale & | offsetMapUnitScale () const |
Returns the map unit scale for the line's offset. | |
Qgis::RenderUnit | offsetUnit () const |
Returns the units for the line's offset. | |
QgsLineSymbolLayer & | operator= (const QgsLineSymbolLayer &other)=delete |
Qgis::RenderUnit | outputUnit () const override |
Returns the units to use for sizes and widths within the symbol layer. | |
virtual void | renderPolygonStroke (const QPolygonF &points, const QVector< QPolygonF > *rings, QgsSymbolRenderContext &context) |
Renders the line symbol layer along the outline of polygon, using the given render context. | |
virtual void | renderPolyline (const QPolygonF &points, QgsSymbolRenderContext &context)=0 |
Renders the line symbol layer along the line joining points, using the given render context. | |
RenderRingFilter | ringFilter () const |
Returns the line symbol layer's ring filter, which controls which rings are rendered when the line symbol is being used to draw a polygon's rings. | |
void | setMapUnitScale (const QgsMapUnitScale &scale) override |
void | setOffset (double offset) |
Sets the line's offset. | |
void | setOffsetMapUnitScale (const QgsMapUnitScale &scale) |
Sets the map unit scale for the line's offset. | |
void | setOffsetUnit (Qgis::RenderUnit unit) |
Sets the unit for the line's offset. | |
void | setOutputUnit (Qgis::RenderUnit unit) override |
Sets the units to use for sizes and widths within the symbol layer. | |
void | setRingFilter (QgsLineSymbolLayer::RenderRingFilter filter) |
Sets the line symbol layer's ring filter, which controls which rings are rendered when the line symbol is being used to draw a polygon's rings. | |
virtual void | setWidth (double width) |
Sets the width of the line symbol layer. | |
void | setWidthMapUnitScale (const QgsMapUnitScale &scale) |
void | setWidthUnit (Qgis::RenderUnit unit) |
Sets the units for the line's width. | |
virtual double | width () const |
Returns the estimated width for the line symbol layer. | |
virtual double | width (const QgsRenderContext &context) const |
Returns the line symbol layer width, in painter units. | |
const QgsMapUnitScale & | widthMapUnitScale () const |
Qgis::RenderUnit | widthUnit () const |
Returns the units for the line's width. | |
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 QgsSymbolLayer * | clone () 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. | |
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. | |
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< 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. | |
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 | startRender (QgsSymbolRenderContext &context)=0 |
Called before a set of rendering operations commences on the supplied render context. | |
virtual void | stopFeatureRender (const QgsFeature &feature, QgsRenderContext &context) |
Called after the layer has been rendered for a particular feature. | |
virtual void | stopRender (QgsSymbolRenderContext &context)=0 |
Called after a set of rendering operations has finished on the supplied render context. | |
virtual QColor | strokeColor () const |
Returns the stroke color for the symbol layer. | |
virtual QgsSymbol * | subSymbol () |
Returns the symbol's sub symbol, if present. | |
virtual void | toSld (QDomDocument &doc, QDomElement &element, const QVariantMap &props) const |
Saves the symbol layer as SLD. | |
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 | |
Protected Member Functions | |
QgsLineSymbolLayer (bool locked=false) | |
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 | |
double | mOffset = 0 |
QgsMapUnitScale | mOffsetMapUnitScale |
Qgis::RenderUnit | mOffsetUnit = Qgis::RenderUnit::Millimeters |
RenderRingFilter | mRingFilter = AllRings |
double | mWidth = 0 |
QgsMapUnitScale | mWidthMapUnitScale |
Qgis::RenderUnit | mWidthUnit = Qgis::RenderUnit::Millimeters |
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. | |
Additional Inherited Members | |
Static Public Member Functions inherited from QgsSymbolLayer | |
static const QgsPropertiesDefinition & | propertyDefinitions () |
Returns the symbol layer property definitions. | |
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. | |
Abstract base class for line symbol layers.
Definition at line 1084 of file qgssymbollayer.h.
Options for filtering rings when the line symbol layer is being used to render a polygon's rings.
Enumerator | |
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AllRings | Render both exterior and interior rings. |
ExteriorRingOnly | Render the exterior ring only. |
InteriorRingsOnly | Render the interior rings only. |
Definition at line 1089 of file qgssymbollayer.h.
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delete |
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protected |
Definition at line 517 of file qgssymbollayer.cpp.
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overridevirtual |
Implements QgsSymbolLayer.
Definition at line 752 of file qgssymbollayer.cpp.
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overridevirtual |
Gets line width.
Reimplemented from QgsSymbolLayer.
Reimplemented in QgsSimpleLineSymbolLayer.
Definition at line 824 of file qgssymbollayer.cpp.
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overridevirtual |
Reimplemented from QgsSymbolLayer.
Reimplemented in QgsTemplatedLineSymbolLayerBase, QgsSimpleLineSymbolLayer, and QgsRasterLineSymbolLayer.
Definition at line 746 of file qgssymbollayer.cpp.
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Returns the line's offset.
Offset units can be retrieved by calling offsetUnit().
Definition at line 1169 of file qgssymbollayer.h.
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Returns the map unit scale for the line's offset.
Definition at line 1212 of file qgssymbollayer.h.
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Returns the units for the line's offset.
Definition at line 1196 of file qgssymbollayer.h.
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delete |
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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.
Reimplemented in QgsTemplatedLineSymbolLayerBase, QgsSimpleLineSymbolLayer, and QgsRasterLineSymbolLayer.
Definition at line 736 of file qgssymbollayer.cpp.
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Renders the line symbol layer along the outline of polygon, using the given render context.
The exterior ring of the polygon is specified in points. Optionally, interior rings are set via the rings argument.
Reimplemented in QgsTemplatedLineSymbolLayerBase, and QgsSimpleLineSymbolLayer.
Definition at line 771 of file qgssymbollayer.cpp.
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pure virtual |
Renders the line symbol layer along the line joining points, using the given render context.
Implemented in QgsArrowSymbolLayer, QgsInterpolatedLineSymbolLayer, QgsLinearReferencingSymbolLayer, QgsSimpleLineSymbolLayer, QgsTemplatedLineSymbolLayerBase, QgsMarkerLineSymbolLayer, QgsHashedLineSymbolLayer, QgsRasterLineSymbolLayer, QgsLineburstSymbolLayer, and QgsFilledLineSymbolLayer.
QgsLineSymbolLayer::RenderRingFilter QgsLineSymbolLayer::ringFilter | ( | ) | const |
Returns the line symbol layer's ring filter, which controls which rings are rendered when the line symbol is being used to draw a polygon's rings.
This setting has no effect when the line symbol is not being rendered for a polygon.
Definition at line 522 of file qgssymbollayer.cpp.
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overridevirtual |
Reimplemented from QgsSymbolLayer.
Reimplemented in QgsTemplatedLineSymbolLayerBase, QgsSimpleLineSymbolLayer, and QgsRasterLineSymbolLayer.
Definition at line 741 of file qgssymbollayer.cpp.
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Sets the line's offset.
Offset units are set via setOffsetUnit().
Definition at line 1180 of file qgssymbollayer.h.
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Sets the map unit scale for the line's offset.
Definition at line 1204 of file qgssymbollayer.h.
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Sets the unit for the line's offset.
Definition at line 1188 of file qgssymbollayer.h.
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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.
Reimplemented in QgsSimpleLineSymbolLayer, QgsTemplatedLineSymbolLayerBase, QgsMarkerLineSymbolLayer, and QgsRasterLineSymbolLayer.
Definition at line 730 of file qgssymbollayer.cpp.
void QgsLineSymbolLayer::setRingFilter | ( | QgsLineSymbolLayer::RenderRingFilter | filter | ) |
Sets the line symbol layer's ring filter, which controls which rings are rendered when the line symbol is being used to draw a polygon's rings.
This setting has no effect when the line symbol is not being rendered for a polygon.
Definition at line 527 of file qgssymbollayer.cpp.
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inlinevirtual |
Sets the width of the line symbol layer.
Calling this method updates the width of the line symbol layer, without changing the existing width units. It has different effects depending on the line symbol layer subclass, e.g. for a simple line layer it changes the stroke width of the line, for a marker line layer it changes the size of the markers used to draw the line.
Reimplemented in QgsMarkerLineSymbolLayer, and QgsHashedLineSymbolLayer.
Definition at line 1135 of file qgssymbollayer.h.
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Definition at line 1230 of file qgssymbollayer.h.
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Sets the units for the line's width.
unit | width units |
Definition at line 1222 of file qgssymbollayer.h.
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inlinevirtual |
Returns the estimated width for the line symbol layer.
Reimplemented in QgsMarkerLineSymbolLayer, and QgsHashedLineSymbolLayer.
Definition at line 1146 of file qgssymbollayer.h.
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Returns the line symbol layer width, in painter units.
This method returns an accurate width by calculating the actual rendered width of the symbol layer using the provided render context.
Reimplemented in QgsMarkerLineSymbolLayer, and QgsHashedLineSymbolLayer.
Definition at line 819 of file qgssymbollayer.cpp.
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Definition at line 1231 of file qgssymbollayer.h.
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Returns the units for the line's width.
Definition at line 1228 of file qgssymbollayer.h.
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Definition at line 1263 of file qgssymbollayer.h.
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Definition at line 1265 of file qgssymbollayer.h.
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Definition at line 1264 of file qgssymbollayer.h.
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Definition at line 1267 of file qgssymbollayer.h.
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Definition at line 1260 of file qgssymbollayer.h.
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Definition at line 1262 of file qgssymbollayer.h.
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Definition at line 1261 of file qgssymbollayer.h.