QGIS API Documentation 3.40.0-Bratislava (b56115d8743)
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Base class for templated line symbols, e.g. More...
#include <qgslinesymbollayer.h>
Public Member Functions | |
QgsTemplatedLineSymbolLayerBase (bool rotateSymbol=true, double interval=3) | |
Constructor for QgsTemplatedLineSymbolLayerBase. | |
~QgsTemplatedLineSymbolLayerBase () override | |
double | averageAngleLength () const |
Returns the length of line over which the line's direction is averaged when calculating individual symbol angles. | |
const QgsMapUnitScale & | averageAngleMapUnitScale () const |
Returns the map unit scale for the length over which the line's direction is averaged when calculating individual symbol angles. | |
Qgis::RenderUnit | averageAngleUnit () const |
Returns the unit for the length over which the line's direction is averaged when calculating individual symbol angles. | |
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. | |
double | interval () const |
Returns the interval between individual symbols. | |
const QgsMapUnitScale & | intervalMapUnitScale () const |
Returns the map unit scale for the interval between symbols. | |
Qgis::RenderUnit | intervalUnit () const |
Returns the units for the interval between symbols. | |
QgsMapUnitScale | mapUnitScale () const FINAL |
double | offsetAlongLine () const |
Returns the offset along the line for the symbol placement. | |
const QgsMapUnitScale & | offsetAlongLineMapUnitScale () const |
Returns the map unit scale used for calculating the offset in map units along line for symbols. | |
Qgis::RenderUnit | offsetAlongLineUnit () const |
Returns the unit used for calculating the offset along line for symbols. | |
Qgis::RenderUnit | outputUnit () const FINAL |
Returns the units to use for sizes and widths within the symbol layer. | |
Q_DECL_DEPRECATED Qgis::MarkerLinePlacement | placement () const |
Returns the placement of the symbols. | |
Qgis::MarkerLinePlacements | placements () const |
Returns the placement of the symbols. | |
bool | placeOnEveryPart () const |
Returns true if the placement applies for every part of multi-part feature geometries. | |
QVariantMap | properties () const override |
Should be reimplemented by subclasses to return a string map that contains the configuration information for the symbol layer. | |
void | renderPolygonStroke (const QPolygonF &points, const QVector< QPolygonF > *rings, QgsSymbolRenderContext &context) FINAL |
Renders the line symbol layer along the outline of polygon, using the given render context. | |
void | renderPolyline (const QPolygonF &points, QgsSymbolRenderContext &context) override |
Renders the line symbol layer along the line joining points, using the given render context. | |
bool | rotateSymbols () const |
Returns true if the repeating symbols be rotated to match their line segment orientation. | |
void | setAverageAngleLength (double length) |
Sets the length of line over which the line's direction is averaged when calculating individual symbol angles. | |
void | setAverageAngleMapUnitScale (const QgsMapUnitScale &scale) |
Sets the map unit scale for the length over which the line's direction is averaged when calculating individual symbol angles. | |
void | setAverageAngleUnit (Qgis::RenderUnit unit) |
Sets the unit for the length over which the line's direction is averaged when calculating individual symbol angles. | |
void | setInterval (double interval) |
Sets the interval between individual symbols. | |
void | setIntervalMapUnitScale (const QgsMapUnitScale &scale) |
Sets the map unit scale for the interval between symbols. | |
void | setIntervalUnit (Qgis::RenderUnit unit) |
Sets the units for the interval between symbols. | |
void | setMapUnitScale (const QgsMapUnitScale &scale) FINAL |
void | setOffsetAlongLine (double offsetAlongLine) |
Sets the the offset along the line for the symbol placement. | |
void | setOffsetAlongLineMapUnitScale (const QgsMapUnitScale &scale) |
Sets the map unit scale used for calculating the offset in map units along line for symbols. | |
void | setOffsetAlongLineUnit (Qgis::RenderUnit unit) |
Sets the unit used for calculating the offset along line for symbols. | |
void | setOutputUnit (Qgis::RenderUnit unit) override |
Sets the units to use for sizes and widths within the symbol layer. | |
Q_DECL_DEPRECATED void | setPlacement (Qgis::MarkerLinePlacement placement) |
Sets the placement of the symbols. | |
void | setPlacements (Qgis::MarkerLinePlacements placements) |
Sets the placement of the symbols. | |
void | setPlaceOnEveryPart (bool respect) |
Sets whether the placement applies for every part of multi-part feature geometries. | |
void | setRotateSymbols (bool rotate) |
Sets whether the repeating symbols should be rotated to match their line segment orientation. | |
void | startFeatureRender (const QgsFeature &feature, QgsRenderContext &context) override |
Called before the layer will be rendered for a particular feature. | |
void | stopFeatureRender (const QgsFeature &feature, QgsRenderContext &context) override |
Called after the layer has been rendered for a particular feature. | |
Public Member Functions inherited from QgsLineSymbolLayer | |
QgsLineSymbolLayer (const QgsLineSymbolLayer &other)=delete | |
void | drawPreviewIcon (QgsSymbolRenderContext &context, QSize size) override |
double | dxfWidth (const QgsDxfExport &e, QgsSymbolRenderContext &context) const override |
Gets line width. | |
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 |
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 | 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 | 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 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. | |
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 | startRender (QgsSymbolRenderContext &context)=0 |
Called before a set of rendering operations commences on the supplied render context. | |
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 | |
void | copyTemplateSymbolProperties (QgsTemplatedLineSymbolLayerBase *destLayer) const |
Copies all common properties of this layer to another templated symbol layer. | |
virtual void | renderSymbol (const QPointF &point, const QgsFeature *feature, QgsRenderContext &context, int layer=-1, bool selected=false)=0 |
Renders the templated symbol at the specified point, using the given render context. | |
virtual void | setSymbolAngle (double angle)=0 |
Sets the symbol's angle, in degrees clockwise. | |
virtual void | setSymbolLineAngle (double angle)=0 |
Sets the line angle modification for the symbol's angle. | |
virtual double | symbolAngle () const =0 |
Returns the symbol's current angle, in degrees clockwise. | |
Protected Member Functions inherited from QgsLineSymbolLayer | |
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. | |
Static Protected Member Functions | |
static void | setCommonProperties (QgsTemplatedLineSymbolLayerBase *destLayer, const QVariantMap &properties) |
Sets all common symbol properties in the destLayer, using the settings serialized in the properties map. | |
Friends | |
class | TestQgsMarkerLineSymbol |
Base class for templated line symbols, e.g.
line symbols which draw markers or hash lines at intervals along the line feature.
Definition at line 554 of file qgslinesymbollayer.h.
QgsTemplatedLineSymbolLayerBase::QgsTemplatedLineSymbolLayerBase | ( | bool | rotateSymbol = true , |
double | interval = 3 |
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Constructor for QgsTemplatedLineSymbolLayerBase.
Creates a template line placed at the specified interval (in millimeters).
The rotateSymbol argument specifies whether individual symbols should be rotated to match the line segment alignment.
Definition at line 1244 of file qgslinesymbollayer.cpp.
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Returns the length of line over which the line's direction is averaged when calculating individual symbol angles.
Longer lengths smooth out angles from jagged lines to a greater extent.
Units are retrieved through averageAngleUnit()
Definition at line 751 of file qgslinesymbollayer.h.
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Returns the map unit scale for the length over which the line's direction is averaged when calculating individual symbol angles.
Definition at line 803 of file qgslinesymbollayer.h.
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Returns the unit for the length over which the line's direction is averaged when calculating individual symbol angles.
Definition at line 783 of file qgslinesymbollayer.h.
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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
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Reimplemented from QgsSymbolLayer.
Definition at line 1535 of file qgslinesymbollayer.cpp.
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Copies all common properties of this layer to another templated symbol layer.
Definition at line 1571 of file qgslinesymbollayer.cpp.
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Returns the interval between individual symbols.
Units are specified through intervalUnits().
Definition at line 587 of file qgslinesymbollayer.h.
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Returns the map unit scale for the interval between symbols.
Definition at line 626 of file qgslinesymbollayer.h.
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Returns the units for the interval between symbols.
Definition at line 610 of file qgslinesymbollayer.h.
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Reimplemented from QgsLineSymbolLayer.
Definition at line 1500 of file qgslinesymbollayer.cpp.
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Returns the offset along the line for the symbol placement.
For Interval placements, this is the distance between the start of the line and the first symbol. For FirstVertex and LastVertex placements, this is the distance between the symbol and the start of the line or the end of the line respectively. This setting has no effect for Vertex or CentralPoint placements.
Definition at line 698 of file qgslinesymbollayer.h.
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Returns the map unit scale used for calculating the offset in map units along line for symbols.
Definition at line 733 of file qgslinesymbollayer.h.
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Returns the unit used for calculating the offset along line for symbols.
Definition at line 719 of file qgslinesymbollayer.h.
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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 QgsLineSymbolLayer.
Definition at line 1474 of file qgslinesymbollayer.cpp.
Qgis::MarkerLinePlacement QgsTemplatedLineSymbolLayerBase::placement | ( | ) | const |
Returns the placement of the symbols.
Definition at line 1251 of file qgslinesymbollayer.cpp.
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Returns the placement of the symbols.
Definition at line 647 of file qgslinesymbollayer.h.
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Returns true
if the placement applies for every part of multi-part feature geometries.
The default is true
, which means that Qgis::MarkerLinePlacement::FirstVertex or Qgis::MarkerLinePlacement::LastVertex placements will result in a symbol on the first/last vertex of EVERY part of a multipart feature.
If false
, then Qgis::MarkerLinePlacement::FirstVertex or Qgis::MarkerLinePlacement::LastVertex placements will result in a symbol on the first/last vertex of the overall multipart geometry only.
Definition at line 670 of file qgslinesymbollayer.h.
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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 1511 of file qgslinesymbollayer.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 from QgsLineSymbolLayer.
Definition at line 1414 of file qgslinesymbollayer.cpp.
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Renders the line symbol layer along the line joining points, using the given render context.
Implements QgsLineSymbolLayer.
Definition at line 1282 of file qgslinesymbollayer.cpp.
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Renders the templated symbol at the specified point, using the given render context.
The feature argument is used to pass the feature currently being rendered (when available).
If only a single symbol layer from the symbol should be rendered, it should be specified in the layer argument. A layer of -1 indicates that all symbol layers should be rendered.
If selected is true
then the symbol will be drawn using the "selected feature" style and colors instead of the symbol's normal style.
Implemented in QgsMarkerLineSymbolLayer, and QgsHashedLineSymbolLayer.
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Returns true
if the repeating symbols be rotated to match their line segment orientation.
Definition at line 574 of file qgslinesymbollayer.h.
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Sets the length of line over which the line's direction is averaged when calculating individual symbol angles.
Longer lengths smooth out angles from jagged lines to a greater extent.
Units are set through setAverageAngleUnit()
Definition at line 763 of file qgslinesymbollayer.h.
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Sets the map unit scale for the length over which the line's direction is averaged when calculating individual symbol angles.
Definition at line 793 of file qgslinesymbollayer.h.
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Sets the unit for the length over which the line's direction is averaged when calculating individual symbol angles.
Definition at line 773 of file qgslinesymbollayer.h.
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Sets all common symbol properties in the destLayer, using the settings serialized in the properties map.
Definition at line 1592 of file qgslinesymbollayer.cpp.
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Sets the interval between individual symbols.
interval | interval size. Units are specified through setIntervalUnit() |
Definition at line 595 of file qgslinesymbollayer.h.
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Sets the map unit scale for the interval between symbols.
Definition at line 618 of file qgslinesymbollayer.h.
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Sets the units for the interval between symbols.
unit | interval units |
Definition at line 603 of file qgslinesymbollayer.h.
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Reimplemented from QgsLineSymbolLayer.
Definition at line 1492 of file qgslinesymbollayer.cpp.
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Sets the the offset along the line for the symbol placement.
For Interval placements, this is the distance between the start of the line and the first symbol. For FirstVertex and LastVertex placements, this is the distance between the symbol and the start of the line or the end of the line respectively. This setting has no effect for Vertex or CentralPoint placements.
offsetAlongLine | Distance to offset markers along the line. The offset unit is set via setOffsetAlongLineUnit. |
Definition at line 711 of file qgslinesymbollayer.h.
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Sets the map unit scale used for calculating the offset in map units along line for symbols.
Definition at line 739 of file qgslinesymbollayer.h.
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Sets the unit used for calculating the offset along line for symbols.
unit | Offset along line unit type. |
Definition at line 727 of file qgslinesymbollayer.h.
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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 QgsLineSymbolLayer.
Definition at line 1484 of file qgslinesymbollayer.cpp.
void QgsTemplatedLineSymbolLayerBase::setPlacement | ( | Qgis::MarkerLinePlacement | placement | ) |
Sets the placement of the symbols.
Definition at line 1275 of file qgslinesymbollayer.cpp.
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Sets the placement of the symbols.
Definition at line 654 of file qgslinesymbollayer.h.
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Sets whether the placement applies for every part of multi-part feature geometries.
The default is true
, which means that Qgis::MarkerLinePlacement::FirstVertex or Qgis::MarkerLinePlacement::LastVertex placements will result in a symbol on the first/last vertex of EVERY part of a multipart feature.
If false
, then Qgis::MarkerLinePlacement::FirstVertex or Qgis::MarkerLinePlacement::LastVertex placements will result in a symbol on the first/last vertex of the overall multipart geometry only.
Definition at line 686 of file qgslinesymbollayer.h.
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Sets whether the repeating symbols should be rotated to match their line segment orientation.
Definition at line 580 of file qgslinesymbollayer.h.
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protectedpure virtual |
Sets the symbol's angle, in degrees clockwise.
Implemented in QgsMarkerLineSymbolLayer, and QgsHashedLineSymbolLayer.
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Sets the line angle modification for the symbol's angle.
This angle is added to the symbol's rotation and data defined rotation before rendering the symbol, and is used for orienting symbols to match the line's angle.
angle | Angle in degrees, valid values are between 0 and 360 |
Implemented in QgsMarkerLineSymbolLayer, and QgsHashedLineSymbolLayer.
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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 1543 of file qgslinesymbollayer.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 1551 of file qgslinesymbollayer.cpp.
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protectedpure virtual |
Returns the symbol's current angle, in degrees clockwise.
Implemented in QgsMarkerLineSymbolLayer, and QgsHashedLineSymbolLayer.
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Definition at line 908 of file qgslinesymbollayer.h.