QGIS API Documentation 3.41.0-Master (af5edcb665c)
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QgsInvertedPolygonRenderer is a polygon-only feature renderer used to display features inverted, where the exterior is turned to an interior and where the exterior theoretically spans the entire plane, allowing to mask the surroundings of some features. More...
#include <qgsinvertedpolygonrenderer.h>
Public Member Functions | |
QgsInvertedPolygonRenderer (const QgsInvertedPolygonRenderer &)=delete | |
Direct copies are forbidden. Use clone() instead. | |
QgsInvertedPolygonRenderer (QgsFeatureRenderer *embeddedRenderer=nullptr) | |
Constructor. | |
QgsInvertedPolygonRenderer * | clone () const override |
Create a deep copy of this renderer. | |
QString | dump () const override |
Returns debug information about this renderer. | |
QgsInvertedPolygonRenderer & | operator= (const QgsInvertedPolygonRenderer &)=delete |
Direct copies are forbidden. Use clone() instead. | |
bool | preprocessingEnabled () const |
QDomElement | save (QDomDocument &doc, const QgsReadWriteContext &context) override |
Stores renderer properties to an XML element. | |
void | setPreprocessingEnabled (bool enabled) |
Public Member Functions inherited from QgsMergedFeatureRenderer | |
QgsMergedFeatureRenderer (const QgsMergedFeatureRenderer &)=delete | |
Direct copies are forbidden. Use clone() instead. | |
QgsMergedFeatureRenderer (QgsFeatureRenderer *embeddedRenderer) | |
Constructor for QgsMergedFeatureRenderer. | |
bool | accept (QgsStyleEntityVisitorInterface *visitor) const override |
Accepts the specified symbology visitor, causing it to visit all symbols associated with the renderer. | |
QgsFeatureRenderer::Capabilities | capabilities () override |
Returns details about internals of this renderer. | |
void | checkLegendSymbolItem (const QString &key, bool state=true) override |
Sets whether the legend symbology item with the specified ley should be checked. | |
QgsMergedFeatureRenderer * | clone () const override |
Create a deep copy of this renderer. | |
QString | dump () const override |
Returns debug information about this renderer. | |
const QgsFeatureRenderer * | embeddedRenderer () const override |
Returns the current embedded renderer (subrenderer) for this feature renderer. | |
bool | filterNeedsGeometry () const override |
Returns true if this renderer requires the geometry to apply the filter. | |
Qgis::FeatureRendererFlags | flags () const override |
Returns flags associated with the renderer. | |
QSet< QString > | legendKeysForFeature (const QgsFeature &feature, QgsRenderContext &context) const override |
Returns legend keys matching a specified feature. | |
QString | legendKeyToExpression (const QString &key, QgsVectorLayer *layer, bool &ok) const override |
Attempts to convert the specified legend rule key to a QGIS expression matching the features displayed using that key. | |
bool | legendSymbolItemChecked (const QString &key) override |
Returns true if the legend symbology item with the specified key is checked. | |
QgsLegendSymbolList | legendSymbolItems () const override |
Returns a list of symbology items for the legend. | |
bool | legendSymbolItemsCheckable () const override |
Returns true if symbology items in legend are checkable. | |
QgsMergedFeatureRenderer & | operator= (const QgsMergedFeatureRenderer &)=delete |
Direct copies are forbidden. Use clone() instead. | |
QgsSymbol * | originalSymbolForFeature (const QgsFeature &feature, QgsRenderContext &context) const override |
Returns symbol for feature. | |
QgsSymbolList | originalSymbolsForFeature (const QgsFeature &feature, QgsRenderContext &context) const override |
Equivalent of originalSymbolsForFeature() call extended to support renderers that may use more symbols per feature - similar to symbolsForFeature() | |
bool | renderFeature (const QgsFeature &feature, QgsRenderContext &context, int layer=-1, bool selected=false, bool drawVertexMarker=false) override |
Renders a given feature. | |
QDomElement | save (QDomDocument &doc, const QgsReadWriteContext &context) override |
Stores renderer properties to an XML element. | |
void | setEmbeddedRenderer (QgsFeatureRenderer *subRenderer) override |
Sets an embedded renderer (subrenderer) for this feature renderer. | |
void | setLegendSymbolItem (const QString &key, QgsSymbol *symbol) override |
Sets the symbol to be used for a legend symbol item. | |
void | startRender (QgsRenderContext &context, const QgsFields &fields) override |
Must be called when a new render cycle is started. | |
void | stopRender (QgsRenderContext &context) override |
The actual rendering will take place here. | |
QgsSymbol * | symbolForFeature (const QgsFeature &feature, QgsRenderContext &context) const override |
To be overridden. | |
QgsSymbolList | symbols (QgsRenderContext &context) const override |
Returns list of symbols used by the renderer. | |
QgsSymbolList | symbolsForFeature (const QgsFeature &feature, QgsRenderContext &context) const override |
Returns list of symbols used for rendering the feature. | |
QSet< QString > | usedAttributes (const QgsRenderContext &context) const override |
Returns a list of attributes required by this renderer. | |
bool | willRenderFeature (const QgsFeature &feature, QgsRenderContext &context) const override |
Returns whether the renderer will render a feature or not. | |
Public Member Functions inherited from QgsFeatureRenderer | |
virtual | ~QgsFeatureRenderer () |
virtual bool | canSkipRender () |
Returns true if the renderer can be entirely skipped, i.e. | |
void | copyRendererData (QgsFeatureRenderer *destRenderer) const |
Clones generic renderer data to another renderer. | |
virtual QList< QgsLayerTreeModelLegendNode * > | createLegendNodes (QgsLayerTreeLayer *nodeLayer) const |
Returns a list of legend nodes to be used for the legend for the renderer. | |
QgsPropertyCollection & | dataDefinedProperties () |
Returns a reference to the renderer's property collection, used for data defined overrides. | |
const QgsPropertyCollection & | dataDefinedProperties () const |
Returns a reference to the renderer's property collection, used for data defined overrides. | |
virtual QString | filter (const QgsFields &fields=QgsFields()) |
If a renderer does not require all the features this method may be overridden and return an expression used as where clause. | |
bool | forceRasterRender () const |
Returns whether the renderer must render as a raster. | |
virtual QString | legendClassificationAttribute () const |
If supported by the renderer, return classification attribute for the use in legend. | |
QSet< QString > | legendKeys () const |
Returns the set of all legend keys used by the renderer. | |
double | maximumExtentBuffer (QgsRenderContext &context) const |
Returns the maximum extent buffer found in this renderer's symbols. | |
virtual void | modifyRequestExtent (QgsRectangle &extent, QgsRenderContext &context) |
Allows for a renderer to modify the extent of a feature request prior to rendering. | |
QgsFeatureRequest::OrderBy | orderBy () const |
Gets the order in which features shall be processed by this renderer. | |
bool | orderByEnabled () const |
Returns whether custom ordering will be applied before features are processed by this renderer. | |
QgsPaintEffect * | paintEffect () const |
Returns the current paint effect for the renderer. | |
double | referenceScale () const |
Returns the symbology reference scale. | |
void | setDataDefinedProperties (const QgsPropertyCollection &collection) |
Sets the renderer's property collection, used for data defined overrides. | |
void | setDataDefinedProperty (Property key, const QgsProperty &property) |
Sets a data defined property for the renderer. | |
void | setForceRasterRender (bool forceRaster) |
Sets whether the renderer should be rendered to a raster destination. | |
void | setOrderBy (const QgsFeatureRequest::OrderBy &orderBy) |
Define the order in which features shall be processed by this renderer. | |
void | setOrderByEnabled (bool enabled) |
Sets whether custom ordering should be applied before features are processed by this renderer. | |
void | setPaintEffect (QgsPaintEffect *effect) |
Sets the current paint effect for the renderer. | |
void | setReferenceScale (double scale) |
Sets the symbology reference scale. | |
void | setUsingSymbolLevels (bool usingSymbolLevels) |
void | setVertexMarkerAppearance (Qgis::VertexMarkerType type, double size) |
Sets type and size of editing vertex markers for subsequent rendering. | |
virtual void | toSld (QDomDocument &doc, QDomElement &element, const QVariantMap &props=QVariantMap()) const |
used from subclasses to create SLD Rule elements following SLD v1.1 specs | |
QString | type () const |
virtual bool | usesEmbeddedSymbols () const |
Returns true if the renderer uses embedded symbols for features. | |
bool | usingSymbolLevels () const |
virtual QDomElement | writeSld (QDomDocument &doc, const QString &styleName, const QVariantMap &props=QVariantMap()) const |
create the SLD UserStyle element following the SLD v1.1 specs with the given name | |
Static Public Member Functions | |
static QgsInvertedPolygonRenderer * | convertFromRenderer (const QgsFeatureRenderer *renderer) |
Creates a QgsInvertedPolygonRenderer by a conversion from an existing renderer. | |
static QgsFeatureRenderer * | create (QDomElement &element, const QgsReadWriteContext &context) |
Creates a renderer out of an XML, for loading. | |
Static Public Member Functions inherited from QgsMergedFeatureRenderer | |
static QgsMergedFeatureRenderer * | convertFromRenderer (const QgsFeatureRenderer *renderer) |
Creates a QgsMergedFeatureRenderer by a conversion from an existing renderer. | |
static QgsFeatureRenderer * | create (QDomElement &element, const QgsReadWriteContext &context) |
Creates a renderer out of an XML, for loading. | |
Static Public Member Functions inherited from QgsFeatureRenderer | |
static QgsFeatureRenderer * | defaultRenderer (Qgis::GeometryType geomType) |
Returns a new renderer - used by default in vector layers. | |
static QgsFeatureRenderer * | load (QDomElement &symbologyElem, const QgsReadWriteContext &context) |
create a renderer from XML element | |
static QgsFeatureRenderer * | loadSld (const QDomNode &node, Qgis::GeometryType geomType, QString &errorMessage) |
Create a new renderer according to the information contained in the UserStyle element of a SLD style document. | |
static const QgsPropertiesDefinition & | propertyDefinitions () |
Returns the symbol property definitions. | |
Additional Inherited Members | |
Public Types inherited from QgsFeatureRenderer | |
typedef QFlags< Capability > | Capabilities |
enum | Capability { SymbolLevels = 1 , MoreSymbolsPerFeature = 1 << 2 , Filter = 1 << 3 , ScaleDependent = 1 << 4 } |
Used to specify details about a renderer. More... | |
enum class | Property : int { HeatmapRadius , HeatmapMaximum } |
Data definable properties for renderers. More... | |
Protected Types inherited from QgsMergedFeatureRenderer | |
enum | GeometryOperation { Merge , InvertOnly , MergeAndInvert } |
Operations to apply to collected geometries prior to rendering. More... | |
Protected Member Functions inherited from QgsMergedFeatureRenderer | |
QgsMergedFeatureRenderer (const QString &type, QgsFeatureRenderer *embeddedRenderer) | |
Constructor for QgsMergedFeatureRenderer. | |
Protected Member Functions inherited from QgsFeatureRenderer | |
QgsFeatureRenderer (const QString &type) | |
void | renderFeatureWithSymbol (const QgsFeature &feature, QgsSymbol *symbol, QgsRenderContext &context, int layer, bool selected, bool drawVertexMarker) |
Render the feature with the symbol using context. | |
void | renderVertexMarker (QPointF pt, QgsRenderContext &context) |
render editing vertex marker at specified point | |
void | renderVertexMarkerPolygon (QPolygonF &pts, QList< QPolygonF > *rings, QgsRenderContext &context) |
render editing vertex marker for a polygon | |
void | renderVertexMarkerPolyline (QPolygonF &pts, QgsRenderContext &context) |
render editing vertex marker for a polyline | |
void | saveRendererData (QDomDocument &doc, QDomElement &element, const QgsReadWriteContext &context) |
Saves generic renderer data into the specified element. | |
Static Protected Member Functions inherited from QgsFeatureRenderer | |
static QPointF | _getPoint (QgsRenderContext &context, const QgsPoint &point) |
Creates a point in screen coordinates from a wkb string in map coordinates. | |
static void | convertSymbolRotation (QgsSymbol *symbol, const QString &field) |
static void | convertSymbolSizeScale (QgsSymbol *symbol, Qgis::ScaleMethod method, const QString &field) |
Protected Attributes inherited from QgsMergedFeatureRenderer | |
GeometryOperation | mOperation = Merge |
Operation to apply to collected geometries. | |
std::unique_ptr< QgsFeatureRenderer > | mSubRenderer |
Embedded renderer. | |
Protected Attributes inherited from QgsFeatureRenderer | |
double | mCurrentVertexMarkerSize = 2 |
The current size of editing marker. | |
Qgis::VertexMarkerType | mCurrentVertexMarkerType = Qgis::VertexMarkerType::Cross |
The current type of editing marker. | |
bool | mForceRaster = false |
QgsFeatureRequest::OrderBy | mOrderBy |
bool | mOrderByEnabled = false |
QgsPaintEffect * | mPaintEffect = nullptr |
double | mReferenceScale = -1.0 |
QString | mType |
bool | mUsingSymbolLevels = false |
QgsInvertedPolygonRenderer is a polygon-only feature renderer used to display features inverted, where the exterior is turned to an interior and where the exterior theoretically spans the entire plane, allowing to mask the surroundings of some features.
It is designed on top of another feature renderer, which is called "embedded" Most of the methods are then only proxies to the embedded renderer.
Features are collected to form one "inverted" polygon during renderFeature() and rendered on stopRender().
Definition at line 41 of file qgsinvertedpolygonrenderer.h.
QgsInvertedPolygonRenderer::QgsInvertedPolygonRenderer | ( | QgsFeatureRenderer * | embeddedRenderer = nullptr | ) |
Constructor.
embeddedRenderer | optional embeddedRenderer. If nullptr , a default one will be assigned. Ownership will be transferred. |
Definition at line 33 of file qgsinvertedpolygonrenderer.cpp.
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delete |
Direct copies are forbidden. Use clone() instead.
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overridevirtual |
Create a deep copy of this renderer.
Should be implemented by all subclasses and generate a proper subclass.
Implements QgsFeatureRenderer.
Definition at line 52 of file qgsinvertedpolygonrenderer.cpp.
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static |
Creates a QgsInvertedPolygonRenderer by a conversion from an existing renderer.
nullptr
. Definition at line 101 of file qgsinvertedpolygonrenderer.cpp.
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static |
Creates a renderer out of an XML, for loading.
Definition at line 68 of file qgsinvertedpolygonrenderer.cpp.
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overridevirtual |
Returns debug information about this renderer.
Reimplemented from QgsFeatureRenderer.
Definition at line 43 of file qgsinvertedpolygonrenderer.cpp.
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delete |
Direct copies are forbidden. Use clone() instead.
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inline |
true
if the geometries are to be preprocessed (merged with an union) before rendering. Definition at line 67 of file qgsinvertedpolygonrenderer.h.
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overridevirtual |
Stores renderer properties to an XML element.
Subclasses which override this method should call saveRendererData() as part of their implementation in order to store all common base class properties in the returned DOM element.
Reimplemented from QgsFeatureRenderer.
Definition at line 82 of file qgsinvertedpolygonrenderer.cpp.
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inline |
enabled | enables or disables the preprocessing. When enabled, geometries will be merged with an union before being rendered. It allows fixing some rendering artifacts (when rendering overlapping polygons for instance). This will involve some CPU-demanding computations and is thus disabled by default. |
Definition at line 75 of file qgsinvertedpolygonrenderer.h.