QGIS API Documentation 3.41.0-Master (d5b93354e9c)
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A renderer that automatically displaces points with the same geographic location. More...
#include <qgspointdisplacementrenderer.h>
Public Types | |
enum | Placement { Ring , ConcentricRings , Grid } |
Placement methods for dispersing points. More... | |
Public Types inherited from QgsPointDistanceRenderer | |
typedef QList< QgsPointDistanceRenderer::GroupedFeature > | ClusteredGroup |
A group of clustered points (ie features within the distance tolerance). | |
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... | |
Public Member Functions | |
QgsPointDisplacementRenderer (const QString &labelAttributeName=QString()) | |
Constructor for QgsPointDisplacementRenderer. | |
bool | accept (QgsStyleEntityVisitorInterface *visitor) const override |
Accepts the specified symbology visitor, causing it to visit all symbols associated with the renderer. | |
QgsMarkerSymbol * | centerSymbol () |
Returns the symbol for the center of a displacement group (but not ownership of the symbol). | |
QColor | circleColor () const |
Returns the color used for drawing the displacement group circle. | |
double | circleRadiusAddition () const |
Returns the factor for increasing the ring size of displacement groups. | |
double | circleWidth () const |
Returns the line width for the displacement group circle in mm. | |
QgsPointDisplacementRenderer * | clone () const override |
Create a deep copy of this renderer. | |
Qgis::FeatureRendererFlags | flags () const override |
Returns flags associated with the renderer. | |
double | labelDistanceFactor () const |
Returns the factor for label distance from the symbol. | |
Placement | placement () const |
Returns the placement method used for dispersing the points. | |
QDomElement | save (QDomDocument &doc, const QgsReadWriteContext &context) override |
Stores renderer properties to an XML element. | |
void | setCenterSymbol (QgsMarkerSymbol *symbol) |
Sets the center symbol for a displacement group. | |
void | setCircleColor (const QColor &color) |
Sets the color used for drawing the displacement group circle. | |
void | setCircleRadiusAddition (double distance) |
Sets a factor for increasing the ring size of displacement groups. | |
void | setCircleWidth (double width) |
Sets the line width for the displacement group circle. | |
void | setLabelDistanceFactor (double factor) |
Sets a factor for increasing the label distances from the symbol. | |
void | setPlacement (Placement placement) |
Sets the placement method used for dispersing the points. | |
void | startRender (QgsRenderContext &context, const QgsFields &fields) override |
Must be called when a new render cycle is started. | |
void | stopRender (QgsRenderContext &context) override |
Must be called when a render cycle has finished, to allow the renderer to clean up. | |
QSet< QString > | usedAttributes (const QgsRenderContext &context) const override |
Returns a list of attributes required by this renderer. | |
Public Member Functions inherited from QgsPointDistanceRenderer | |
QgsPointDistanceRenderer (const QString &rendererName, const QString &labelAttributeName=QString()) | |
Constructor for QgsPointDistanceRenderer. | |
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) override |
Sets whether the legend symbology item with the specified ley should be checked. | |
const QgsFeatureRenderer * | embeddedRenderer () const override |
Returns the current embedded renderer (subrenderer) for this feature renderer. | |
QString | filter (const QgsFields &fields=QgsFields()) override |
If a renderer does not require all the features this method may be overridden and return an expression used as where clause. | |
bool | filterNeedsGeometry () const override |
Returns true if this renderer requires the geometry to apply the filter. | |
QString | labelAttributeName () const |
Returns the attribute name used for labeling points, or an empty string if no labeling will be done by the renderer. | |
QColor | labelColor () const |
Returns the color used for for labeling points. | |
QFont | labelFont () const |
Returns the font used for labeling points. | |
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. | |
double | minimumLabelScale () const |
Returns the minimum map scale (i.e. | |
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 |
Render a feature using this renderer in the given context. | |
void | setEmbeddedRenderer (QgsFeatureRenderer *r) override |
Sets an embedded renderer (subrenderer) for this feature renderer. | |
void | setLabelAttributeName (const QString &name) |
Sets the attribute name for labeling points. | |
void | setLabelColor (const QColor &color) |
Sets the color to use for for labeling points. | |
void | setLabelFont (const QFont &font) |
Sets the font used for labeling points. | |
void | setLegendSymbolItem (const QString &key, QgsSymbol *symbol) override |
Sets the symbol to be used for a legend symbol item. | |
void | setMinimumLabelScale (double scale) |
Sets the minimum map scale (i.e. | |
void | setTolerance (double distance) |
Sets the tolerance distance for grouping points. | |
void | setToleranceMapUnitScale (const QgsMapUnitScale &scale) |
Sets the map unit scale object for the distance tolerance. | |
void | setToleranceUnit (Qgis::RenderUnit unit) |
Sets the units for the tolerance distance. | |
void | startRender (QgsRenderContext &context, const QgsFields &fields) override |
Must be called when a new render cycle is started. | |
void | stopRender (QgsRenderContext &context) override |
Must be called when a render cycle has finished, to allow the renderer to clean up. | |
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. | |
double | tolerance () const |
Returns the tolerance distance for grouping points. | |
const QgsMapUnitScale & | toleranceMapUnitScale () const |
Returns the map unit scale object for the distance tolerance. | |
Qgis::RenderUnit | toleranceUnit () const |
Returns the units for the tolerance distance. | |
void | toSld (QDomDocument &doc, QDomElement &element, const QVariantMap &props=QVariantMap()) const override |
used from subclasses to create SLD Rule elements following SLD v1.1 specs | |
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 | dump () const |
Returns debug information about this renderer. | |
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. | |
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. | |
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 QgsPointDisplacementRenderer * | convertFromRenderer (const QgsFeatureRenderer *renderer) |
Creates a QgsPointDisplacementRenderer from an existing renderer. | |
static QgsFeatureRenderer * | create (QDomElement &symbologyElem, const QgsReadWriteContext &context) |
Create a renderer from XML element. | |
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 | |
Protected Member Functions inherited from QgsPointDistanceRenderer | |
void | drawLabels (QPointF centerPoint, QgsSymbolRenderContext &context, const QList< QPointF > &labelShifts, const ClusteredGroup &group) const |
Renders the labels for a group. | |
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 QgsPointDistanceRenderer | |
QList< ClusteredGroup > | mClusteredGroups |
Groups of features that are considered clustered together. | |
bool | mDrawLabels |
Whether labels should be drawn for points. This is set internally from startRender() depending on scale denominator. | |
QMap< QgsFeatureId, int > | mGroupIndex |
Mapping of feature ID to the feature's group index. | |
QMap< QgsFeatureId, QgsPointXY > | mGroupLocations |
Mapping of feature ID to approximate group location. | |
QString | mLabelAttributeName |
Attribute name for labeling. An empty string indicates that no labels should be rendered. | |
QColor | mLabelColor |
Label text color. | |
QFont | mLabelFont |
Label font. | |
int | mLabelIndex |
Label attribute index (or -1 if none). This index is not stored, it is requested in the startRender() method. | |
double | mMinLabelScale = 0 |
Maximum scale denominator for label display. A zero value indicates no scale limitation. | |
std::unique_ptr< QgsFeatureRenderer > | mRenderer |
Embedded base renderer. This can be used for rendering individual, isolated points. | |
QgsSpatialIndex * | mSpatialIndex = nullptr |
Spatial index for fast lookup of nearby points. | |
double | mTolerance |
Distance tolerance. Points that are closer together than this distance are considered clustered. | |
QgsMapUnitScale | mToleranceMapUnitScale |
Map unit scale for distance tolerance. | |
Qgis::RenderUnit | mToleranceUnit |
Unit for distance tolerance. | |
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 |
A renderer that automatically displaces points with the same geographic location.
Definition at line 30 of file qgspointdisplacementrenderer.h.
Placement methods for dispersing points.
Enumerator | |
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Ring | Place points in a single ring around group. |
ConcentricRings | Place points in concentric rings around group. |
Grid | Place points in a grid around group. |
Definition at line 37 of file qgspointdisplacementrenderer.h.
QgsPointDisplacementRenderer::QgsPointDisplacementRenderer | ( | const QString & | labelAttributeName = QString() | ) |
Constructor for QgsPointDisplacementRenderer.
labelAttributeName | optional attribute name for labeling points |
Definition at line 31 of file qgspointdisplacementrenderer.cpp.
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overridevirtual |
Accepts the specified symbology visitor, causing it to visit all symbols associated with the renderer.
Returns true
if the visitor should continue visiting other objects, or false
if visiting should be canceled.
Reimplemented from QgsFeatureRenderer.
Definition at line 249 of file qgspointdisplacementrenderer.cpp.
QgsMarkerSymbol * QgsPointDisplacementRenderer::centerSymbol | ( | ) |
Returns the symbol for the center of a displacement group (but not ownership of the symbol).
Definition at line 203 of file qgspointdisplacementrenderer.cpp.
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inline |
Returns the color used for drawing the displacement group circle.
Definition at line 89 of file qgspointdisplacementrenderer.h.
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Returns the factor for increasing the ring size of displacement groups.
Definition at line 102 of file qgspointdisplacementrenderer.h.
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inline |
Returns the line width for the displacement group circle in mm.
Definition at line 74 of file qgspointdisplacementrenderer.h.
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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 48 of file qgspointdisplacementrenderer.cpp.
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Creates a QgsPointDisplacementRenderer from an existing renderer.
nullptr
. Definition at line 480 of file qgspointdisplacementrenderer.cpp.
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Create a renderer from XML element.
Definition at line 166 of file qgspointdisplacementrenderer.cpp.
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overridevirtual |
Returns flags associated with the renderer.
Reimplemented from QgsFeatureRenderer.
Definition at line 38 of file qgspointdisplacementrenderer.cpp.
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inline |
Returns the factor for label distance from the symbol.
Definition at line 117 of file qgspointdisplacementrenderer.h.
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Returns the placement method used for dispersing the points.
Definition at line 123 of file qgspointdisplacementrenderer.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 208 of file qgspointdisplacementrenderer.cpp.
void QgsPointDisplacementRenderer::setCenterSymbol | ( | QgsMarkerSymbol * | symbol | ) |
Sets the center symbol for a displacement group.
symbol | new center symbol. Ownership is transferred to the renderer. |
Definition at line 264 of file qgspointdisplacementrenderer.cpp.
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Sets the color used for drawing the displacement group circle.
color | circle color |
Definition at line 82 of file qgspointdisplacementrenderer.h.
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Sets a factor for increasing the ring size of displacement groups.
distance | addition factor |
Definition at line 96 of file qgspointdisplacementrenderer.h.
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Sets the line width for the displacement group circle.
width | line width in mm |
Definition at line 67 of file qgspointdisplacementrenderer.h.
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Sets a factor for increasing the label distances from the symbol.
factor | addition factor |
Definition at line 110 of file qgspointdisplacementrenderer.h.
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Sets the placement method used for dispersing the points.
placement | placement method |
Definition at line 130 of file qgspointdisplacementrenderer.h.
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overridevirtual |
Must be called when a new render cycle is started.
A call to startRender() must always be followed by a corresponding call to stopRender() after all features have been rendered.
context | Additional information passed to the renderer about the job which will be rendered |
fields | The fields available for rendering |
Reimplemented from QgsFeatureRenderer.
Definition at line 147 of file qgspointdisplacementrenderer.cpp.
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overridevirtual |
Must be called when a render cycle has finished, to allow the renderer to clean up.
Calls to stopRender() must always be preceded by a call to startRender().
Reimplemented from QgsFeatureRenderer.
Definition at line 157 of file qgspointdisplacementrenderer.cpp.
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overridevirtual |
Returns a list of attributes required by this renderer.
Attributes not listed in here may not have been requested from the provider at rendering time.
Implements QgsFeatureRenderer.
Definition at line 241 of file qgspointdisplacementrenderer.cpp.