QGIS API Documentation 3.36.0-Maidenhead (09951dc0acf)
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A line symbol type, for rendering LineString and MultiLineString geometries. More...
#include <qgslinesymbol.h>
Public Member Functions | |
QgsLineSymbol (const QgsSymbolLayerList &layers=QgsSymbolLayerList()) | |
Constructor for QgsLineSymbol, with the specified list of initial symbol layers. | |
QgsLineSymbol * | clone () const override |
Returns a deep copy of this symbol. | |
QgsProperty | dataDefinedWidth () const |
Returns data defined width for whole symbol (including all symbol layers). | |
void | renderPolyline (const QPolygonF &points, const QgsFeature *f, QgsRenderContext &context, int layer=-1, bool selected=false) |
Renders the symbol along the line joining points, using the given render context. | |
void | setDataDefinedWidth (const QgsProperty &property) const |
Set data defined width for whole symbol (including all symbol layers). | |
void | setWidth (double width) const |
Sets the width for the whole line symbol. | |
void | setWidthUnit (Qgis::RenderUnit unit) const |
Sets the width units for the whole symbol (including all symbol layers). | |
double | width () const |
Returns the estimated width for the whole symbol, which is the maximum width of all marker symbol layers in the symbol. | |
double | width (const QgsRenderContext &context) const |
Returns the symbol width, in painter units. | |
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virtual | ~QgsSymbol () |
QgsSymbolAnimationSettings & | animationSettings () |
Returns a reference to the symbol animation settings. | |
const QgsSymbolAnimationSettings & | animationSettings () const |
Returns a reference to the symbol animation settings. | |
bool | appendSymbolLayer (QgsSymbolLayer *layer) |
Appends a symbol layer at the end of the current symbol layer list. | |
QImage | asImage (QSize size, QgsRenderContext *customContext=nullptr) |
Returns an image of the symbol at the specified size. | |
Q_DECL_DEPRECATED QImage | bigSymbolPreviewImage (QgsExpressionContext *expressionContext=nullptr, int flags=static_cast< int >(Qgis::SymbolPreviewFlag::FlagIncludeCrosshairsForMarkerSymbols)) |
QImage | bigSymbolPreviewImage (QgsExpressionContext *expressionContext=nullptr, Qgis::SymbolPreviewFlags flags=Qgis::SymbolPreviewFlag::FlagIncludeCrosshairsForMarkerSymbols, const QgsScreenProperties &screen=QgsScreenProperties()) |
Returns a large (roughly 100x100 pixel) preview image for the symbol. | |
bool | canCauseArtifactsBetweenAdjacentTiles () const |
Returns true if the symbol 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 | changeSymbolLayer (int index, QgsSymbolLayer *layer) |
Deletes the current layer at the specified index and replaces it with layer. | |
bool | clipFeaturesToExtent () const |
Returns whether features drawn by the symbol will be clipped to the render context's extent. | |
QColor | color () const |
Returns the symbol's color. | |
QgsPropertyCollection & | dataDefinedProperties () |
Returns a reference to the symbol's property collection, used for data defined overrides. | |
const QgsPropertyCollection & | dataDefinedProperties () const |
Returns a reference to the symbol's property collection, used for data defined overrides. | |
bool | deleteSymbolLayer (int index) |
Removes and deletes the symbol layer at the specified index. | |
void | drawPreviewIcon (QPainter *painter, QSize size, QgsRenderContext *customContext=nullptr, bool selected=false, const QgsExpressionContext *expressionContext=nullptr, const QgsLegendPatchShape *patchShape=nullptr, const QgsScreenProperties &screen=QgsScreenProperties()) |
Draws an icon of the symbol that occupies an area given by size using the specified painter. | |
QString | dump () const |
Returns a string dump of the symbol's properties. | |
void | exportImage (const QString &path, const QString &format, QSize size) |
Export the symbol as an image format, to the specified path and with the given size. | |
Qgis::SymbolFlags | flags () const |
Returns flags for the symbol. | |
bool | forceRHR () const |
Returns true if polygon features drawn by the symbol will be reoriented to follow the standard right-hand-rule orientation, in which the area that is bounded by the polygon is to the right of the boundary. | |
bool | hasDataDefinedProperties () const |
Returns whether the symbol utilizes any data defined properties. | |
bool | insertSymbolLayer (int index, QgsSymbolLayer *layer) |
Inserts a symbol layer to specified index. | |
Q_DECL_DEPRECATED const QgsVectorLayer * | layer () const |
QgsMapUnitScale | mapUnitScale () const |
Returns the map unit scale for the symbol. | |
qreal | opacity () const |
Returns the opacity for the symbol. | |
Qgis::RenderUnit | outputUnit () const |
Returns the units to use for sizes and widths within the symbol. | |
void | renderFeature (const QgsFeature &feature, QgsRenderContext &context, int layer=-1, bool selected=false, bool drawVertexMarker=false, Qgis::VertexMarkerType currentVertexMarkerType=Qgis::VertexMarkerType::SemiTransparentCircle, double currentVertexMarkerSize=0.0) |
Render a feature. | |
Qgis::SymbolRenderHints | renderHints () const |
Returns the rendering hint flags for the symbol. | |
void | setAnimationSettings (const QgsSymbolAnimationSettings &settings) |
Sets a the symbol animation settings. | |
void | setClipFeaturesToExtent (bool clipFeaturesToExtent) |
Sets whether features drawn by the symbol should be clipped to the render context's extent. | |
void | setColor (const QColor &color) const |
Sets the color for the symbol. | |
void | setDataDefinedProperties (const QgsPropertyCollection &collection) |
Sets the symbol's property collection, used for data defined overrides. | |
void | setDataDefinedProperty (Property key, const QgsProperty &property) |
Sets a data defined property for the symbol. | |
void | setFlags (Qgis::SymbolFlags flags) |
Sets flags for the symbol. | |
void | setForceRHR (bool force) |
Sets whether polygon features drawn by the symbol should be reoriented to follow the standard right-hand-rule orientation, in which the area that is bounded by the polygon is to the right of the boundary. | |
Q_DECL_DEPRECATED void | setLayer (const QgsVectorLayer *layer) |
void | setMapUnitScale (const QgsMapUnitScale &scale) const |
Sets the map unit scale for the symbol. | |
void | setOpacity (qreal opacity) |
Sets the opacity for the symbol. | |
void | setOutputUnit (Qgis::RenderUnit unit) const |
Sets the units to use for sizes and widths within the symbol. | |
void | setRenderHints (Qgis::SymbolRenderHints hints) |
Sets rendering hint flags for the symbol. | |
void | startFeatureRender (const QgsFeature &feature, QgsRenderContext &context, int layer=-1) |
Called before symbol layers will be rendered for a particular feature. | |
void | startRender (QgsRenderContext &context, const QgsFields &fields=QgsFields()) |
Begins the rendering process for the symbol. | |
void | stopFeatureRender (const QgsFeature &feature, QgsRenderContext &context, int layer=-1) |
Called after symbol layers have been rendered for a particular feature. | |
void | stopRender (QgsRenderContext &context) |
Ends the rendering process. | |
QgsSymbolLayer * | symbolLayer (int layer) |
Returns the symbol layer at the specified index. | |
const QgsSymbolLayer * | symbolLayer (int layer) const |
Returns the symbol layer at the specified index, const variant. | |
int | symbolLayerCount () const |
Returns the total number of symbol layers contained in the symbol. | |
QgsSymbolLayerList | symbolLayers () const |
Returns the list of symbol layers contained in the symbol. | |
QgsSymbolRenderContext * | symbolRenderContext () |
Returns the symbol render context. | |
QgsSymbolLayer * | takeSymbolLayer (int index) |
Removes a symbol layer from the list and returns a pointer to it. | |
void | toSld (QDomDocument &doc, QDomElement &element, QVariantMap props) const |
Converts the symbol to a SLD representation. | |
Qgis::SymbolType | type () const |
Returns the symbol's type. | |
QSet< QString > | usedAttributes (const QgsRenderContext &context) const |
Returns a list of attributes required to render this feature. | |
bool | usesMapUnits () const |
Returns true if the symbol has any components which use map unit based sizes. | |
Static Public Member Functions | |
static QgsLineSymbol * | createSimple (const QVariantMap &properties) |
Create a line symbol with one symbol layer: SimpleLine with specified properties. | |
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static QgsSymbol * | defaultSymbol (Qgis::GeometryType geomType) |
Returns a new default symbol for the specified geometry type. | |
static const QgsPropertiesDefinition & | propertyDefinitions () |
Returns the symbol property definitions. | |
static Qgis::SymbolType | symbolTypeForGeometryType (Qgis::GeometryType type) |
Returns the default symbol type required for the specified geometry type. | |
static QString | symbolTypeToString (Qgis::SymbolType type) |
Returns a translated string version of the specified symbol type. | |
Additional Inherited Members | |
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enum class | Property : int { Opacity } |
Data definable properties. More... | |
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QgsSymbol (Qgis::SymbolType type, const QgsSymbolLayerList &layers) | |
Constructor for a QgsSymbol of the specified type. | |
QgsSymbolLayerList | cloneLayers () const |
Retrieve a cloned list of all layers that make up this symbol. | |
void | renderUsingLayer (QgsSymbolLayer *layer, QgsSymbolRenderContext &context, Qgis::GeometryType geometryType=Qgis::GeometryType::Unknown, const QPolygonF *points=nullptr, const QVector< QPolygonF > *rings=nullptr) |
Renders a context using a particular symbol layer without passing in a geometry. | |
void | renderVertexMarker (QPointF pt, QgsRenderContext &context, Qgis::VertexMarkerType currentVertexMarkerType, double currentVertexMarkerSize) |
Render editing vertex marker at specified point. | |
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static QPolygonF | _getLineString (QgsRenderContext &context, const QgsCurve &curve, bool clipToExtent=true) |
Creates a line string in screen coordinates from a QgsCurve in map coordinates. | |
static QPointF | _getPoint (QgsRenderContext &context, const QgsPoint &point) |
Creates a point in screen coordinates from a QgsPoint in map coordinates. | |
static void | _getPolygon (QPolygonF &pts, QVector< QPolygonF > &holes, QgsRenderContext &context, const QgsPolygon &polygon, bool clipToExtent=true, bool correctRingOrientation=false) |
Creates a polygon in screen coordinates from a QgsPolygonXYin map coordinates. | |
static QPolygonF | _getPolygonRing (QgsRenderContext &context, const QgsCurve &curve, bool clipToExtent, bool isExteriorRing=false, bool correctRingOrientation=false) |
Creates a polygon ring in screen coordinates from a QgsCurve in map coordinates. | |
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QgsSymbolAnimationSettings | mAnimationSettings |
bool | mClipFeaturesToExtent = true |
bool | mForceRHR = false |
Q_DECL_DEPRECATED const QgsVectorLayer * | mLayer = nullptr |
QgsSymbolLayerList | mLayers |
qreal | mOpacity = 1.0 |
Symbol opacity (in the range 0 - 1) | |
Qgis::SymbolRenderHints | mRenderHints |
Qgis::SymbolFlags | mSymbolFlags = Qgis::SymbolFlags() |
Symbol flags. | |
Qgis::SymbolType | mType |
A line symbol type, for rendering LineString and MultiLineString geometries.
Definition at line 29 of file qgslinesymbol.h.
QgsLineSymbol::QgsLineSymbol | ( | const QgsSymbolLayerList & | layers = QgsSymbolLayerList() | ) |
Constructor for QgsLineSymbol, with the specified list of initial symbol layers.
Ownership of the layers are transferred to the symbol.
Definition at line 33 of file qgslinesymbol.cpp.
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overridevirtual |
Returns a deep copy of this symbol.
Ownership is transferred to the caller.
Implements QgsSymbol.
Definition at line 303 of file qgslinesymbol.cpp.
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static |
Create a line symbol with one symbol layer: SimpleLine with specified properties.
This is a convenience method for easier creation of line symbols.
Definition at line 22 of file qgslinesymbol.cpp.
QgsProperty QgsLineSymbol::dataDefinedWidth | ( | ) | const |
Returns data defined width for whole symbol (including all symbol layers).
Definition at line 178 of file qgslinesymbol.cpp.
void QgsLineSymbol::renderPolyline | ( | const QPolygonF & | points, |
const QgsFeature * | f, | ||
QgsRenderContext & | context, | ||
int | layer = -1 , |
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bool | selected = false |
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Renders the symbol along the line joining points, using the given render context.
The f 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.
Definition at line 232 of file qgslinesymbol.cpp.
void QgsLineSymbol::setDataDefinedWidth | ( | const QgsProperty & | property | ) | const |
Set data defined width for whole symbol (including all symbol layers).
Definition at line 142 of file qgslinesymbol.cpp.
void QgsLineSymbol::setWidth | ( | double | width | ) | const |
Sets the width for the whole line symbol.
Individual symbol layer sizes will be scaled to maintain their current relative size to the whole symbol size.
Definition at line 40 of file qgslinesymbol.cpp.
void QgsLineSymbol::setWidthUnit | ( | Qgis::RenderUnit | unit | ) | const |
Sets the width units for the whole symbol (including all symbol layers).
unit | size units |
Definition at line 83 of file qgslinesymbol.cpp.
double QgsLineSymbol::width | ( | ) | const |
Returns the estimated width for the whole symbol, which is the maximum width of all marker symbol layers in the symbol.
Definition at line 96 of file qgslinesymbol.cpp.
double QgsLineSymbol::width | ( | const QgsRenderContext & | context | ) | const |
Returns the symbol width, in painter units.
This is the maximum width of all marker symbol layers in the symbol.
This method returns an accurate width by calculating the actual rendered width of each symbol layer using the provided render context.
Definition at line 127 of file qgslinesymbol.cpp.