35 , mLabelAttributeName( labelAttributeName )
38 , mToleranceUnit(
Qgis::RenderUnit::Millimeters )
53 Q_UNUSED( drawVertexMarker )
84 label = getLabel( feature );
100 const QgsPoint *point = qgsgeometry_cast< const QgsPoint * >( *partIt );
105 if ( intersectList.empty() )
120 double minDist =
mGroupLocations.value( minDistFeatureId ).distance( point->
x(), point->
y() );
121 for (
int i = 1; i < intersectList.count(); ++i )
124 const double newDist =
mGroupLocations.value( candidateId ).distance( point->
x(), point->
y() );
125 if ( newDist < minDist )
128 minDistFeatureId = candidateId;
132 const int groupIdx =
mGroupIndex[ minDistFeatureId ];
138 ( oldCenter.
y() * group.size() + point->
y() ) / ( group.size() + 1.0 ) );
150void QgsPointDistanceRenderer::drawGroup(
const ClusteredGroup &group,
QgsRenderContext &context )
const
154 const auto constGroup = group;
155 for (
const GroupedFeature &f : constGroup )
157 groupMultiPoint->
addGeometry( f.feature.geometry().constGet()->clone() );
161 QPointF pt = centroid.asQPointF();
165 drawGroup( pt, context, group );
191 return mRenderer->legendSymbolItemsCheckable();
199 return mRenderer->legendSymbolItemChecked( key );
207 mRenderer->checkLegendSymbolItem( key, state );
229 QSet<QString> attributeList;
236 attributeList +=
mRenderer->usedAttributes( context );
238 return attributeList;
270 return mRenderer->symbolForFeature( feature, context );
277 return mRenderer->originalSymbolForFeature( feature, context );
286 return mRenderer->symbolsForFeature( feature, context );
293 return mRenderer->originalSymbolsForFeature( feature, context );
299 return QSet< QString >() << QString();
300 return mRenderer->legendKeysForFeature( feature, context );
308 return mRenderer->legendKeyToExpression( key, layer, ok );
317 return mRenderer->willRenderFeature( feature, context );
325 mRenderer->startRender( context, fields );
362 drawGroup( group, context );
386 return QgsRectangle( p->
x() - distance, p->
y() - distance, p->
x() + distance, p->
y() + distance );
389void QgsPointDistanceRenderer::printGroupInfo()
const
393 QgsDebugMsgLevel(
"number of displacement groups:" + QString::number( nGroups ), 3 );
394 for (
int i = 0; i < nGroups; ++i )
396 QgsDebugMsgLevel(
"***************displacement group " + QString::number( i ), 3 );
398 for (
const GroupedFeature &feature : constAt )
406QString QgsPointDistanceRenderer::getLabel(
const QgsFeature &feature )
const
426 p->setPen( labelPen );
432 pixelSizeFont.setPixelSize(
static_cast< int >( std::round( fontSizeInPixels ) ) );
433 QFont scaledFont = pixelSizeFont;
434 scaledFont.setPixelSize( pixelSizeFont.pixelSize() );
435 p->setFont( scaledFont );
437 const QFontMetricsF fontMetrics( pixelSizeFont );
438 QPointF currentLabelShift;
440 QList<QPointF>::const_iterator labelPosIt = labelShifts.constBegin();
441 ClusteredGroup::const_iterator groupIt = group.constBegin();
443 for ( ; labelPosIt != labelShifts.constEnd() && groupIt != group.constEnd(); ++labelPosIt, ++groupIt )
445 currentLabelShift = *labelPosIt;
446 if ( currentLabelShift.x() < 0 )
448 currentLabelShift.setX( currentLabelShift.x() - fontMetrics.horizontalAdvance( groupIt->label ) );
450 if ( currentLabelShift.y() > 0 )
452 currentLabelShift.setY( currentLabelShift.y() + fontMetrics.ascent() );
455 const QPointF drawingPoint( centerPoint + currentLabelShift );
457 p->translate( drawingPoint.x(), drawingPoint.y() );
458 p->drawText( QPointF( 0, 0 ), groupIt->label );
465 if ( group.size() > 1 )
469 ClusteredGroup::const_iterator groupIt = group.constBegin();
470 for ( ; groupIt != group.constEnd(); ++groupIt )
472 if ( !groupIt->symbol() )
475 if ( !groupColor.isValid() )
477 groupColor = groupIt->symbol()->color();
481 if ( groupColor != groupIt->symbol()->color() )
483 groupColor = QColor();
489 if ( groupColor.isValid() )
501 if ( !group.empty() )
504 clusterScope->
setFeature( group.at( 0 ).feature );
517 if ( symbolList.isEmpty() )
527 , isSelected( isSelected )
The Qgis class provides global constants for use throughout the application.
@ Points
Points (e.g., for font sizes)
WkbType
The WKB type describes the number of dimensions a geometry has.
virtual QgsPoint centroid() const
Returns the centroid of the geometry.
RAII class to pop scope from an expression context on destruction.
Single scope for storing variables and functions for use within a QgsExpressionContext.
void setFeature(const QgsFeature &feature)
Convenience function for setting a feature for the scope.
void addVariable(const QgsExpressionContextScope::StaticVariable &variable)
Adds a variable into the context scope.
static const QString EXPR_CLUSTER_SIZE
Inbuilt variable name for cluster size variable.
static const QString EXPR_CLUSTER_COLOR
Inbuilt variable name for cluster color variable.
Abstract base class for all 2D vector feature renderers.
virtual QString filter(const QgsFields &fields=QgsFields())
If a renderer does not require all the features this method may be overridden and return an expressio...
virtual void setLegendSymbolItem(const QString &key, QgsSymbol *symbol)
Sets the symbol to be used for a legend symbol item.
static QgsFeatureRenderer * defaultRenderer(Qgis::GeometryType geomType)
Returns a new renderer - used by default in vector layers.
virtual void stopRender(QgsRenderContext &context)
Must be called when a render cycle has finished, to allow the renderer to clean up.
QFlags< Capability > Capabilities
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
virtual void startRender(QgsRenderContext &context, const QgsFields &fields)
Must be called when a new render cycle is started.
The feature class encapsulates a single feature including its unique ID, geometry and a list of field...
bool hasGeometry() const
Returns true if the feature has an associated geometry.
void setGeometry(const QgsGeometry &geometry)
Set the feature's geometry.
Container of fields for a vector layer.
Q_INVOKABLE int lookupField(const QString &fieldName) const
Looks up field's index from the field name.
A geometry is the spatial representation of a feature.
QgsAbstractGeometry::const_part_iterator const_parts_begin() const
Returns STL-style const iterator pointing to the first part of the geometry.
Qgis::GeometryOperationResult transform(const QgsCoordinateTransform &ct, Qgis::TransformDirection direction=Qgis::TransformDirection::Forward, bool transformZ=false)
Transforms this geometry as described by the coordinate transform ct.
QgsAbstractGeometry::const_part_iterator const_parts_end() const
Returns STL-style iterator pointing to the imaginary part after the last part of the geometry.
Qgis::WkbType wkbType() const
Returns type of the geometry as a WKB type (point / linestring / polygon etc.)
void transformInPlace(double &x, double &y) const
Transforms map coordinates to device coordinates.
A marker symbol type, for rendering Point and MultiPoint geometries.
QgsMarkerSymbol * clone() const override
Returns a deep copy of this symbol.
Multi point geometry collection.
bool addGeometry(QgsAbstractGeometry *g) override
Adds a geometry and takes ownership. Returns true in case of success.
QMap< QgsFeatureId, QgsPointXY > mGroupLocations
Mapping of feature ID to approximate group location.
double mMinLabelScale
Maximum scale denominator for label display. A zero value indicates no scale limitation.
int mLabelIndex
Label attribute index (or -1 if none). This index is not stored, it is requested in the startRender()...
bool legendSymbolItemChecked(const QString &key) override
Returns true if the legend symbology item with the specified key is checked.
QgsSpatialIndex * mSpatialIndex
Spatial index for fast lookup of nearby points.
QgsSymbolList symbols(QgsRenderContext &context) const override
Returns list of symbols used by the renderer.
QColor mLabelColor
Label text color.
QgsMapUnitScale mToleranceMapUnitScale
Map unit scale for distance tolerance.
QString filter(const QgsFields &fields=QgsFields()) override
If a renderer does not require all the features this method may be overridden and return an expressio...
QList< ClusteredGroup > mClusteredGroups
Groups of features that are considered clustered together.
QMap< QgsFeatureId, int > mGroupIndex
Mapping of feature ID to the feature's group index.
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
QgsPointDistanceRenderer(const QString &rendererName, const QString &labelAttributeName=QString())
Constructor for QgsPointDistanceRenderer.
void drawLabels(QPointF centerPoint, QgsSymbolRenderContext &context, const QList< QPointF > &labelShifts, const ClusteredGroup &group) const
Renders the labels for a group.
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 stopRender(QgsRenderContext &context) override
Must be called when a render cycle has finished, to allow the renderer to clean up.
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 displaye...
QgsSymbol * symbolForFeature(const QgsFeature &feature, QgsRenderContext &context) const override
To be overridden.
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.
QgsSymbolList originalSymbolsForFeature(const QgsFeature &feature, QgsRenderContext &context) const override
Equivalent of originalSymbolsForFeature() call extended to support renderers that may use more symbol...
void startRender(QgsRenderContext &context, const QgsFields &fields) override
Must be called when a new render cycle is started.
void setEmbeddedRenderer(QgsFeatureRenderer *r) override
Sets an embedded renderer (subrenderer) for this feature renderer.
QgsFeatureRenderer::Capabilities capabilities() override
Returns details about internals of this renderer.
const QgsFeatureRenderer * embeddedRenderer() const override
Returns the current embedded renderer (subrenderer) for this feature renderer.
QString mLabelAttributeName
Attribute name for labeling. An empty string indicates that no labels should be rendered.
void checkLegendSymbolItem(const QString &key, bool state) override
Sets whether the legend symbology item with the specified ley should be checked.
QgsSymbolList symbolsForFeature(const QgsFeature &feature, QgsRenderContext &context) const override
Returns list of symbols used for rendering the feature.
double mTolerance
Distance tolerance. Points that are closer together than this distance are considered clustered.
QSet< QString > usedAttributes(const QgsRenderContext &context) const override
Returns a list of attributes required by this renderer.
bool mDrawLabels
Whether labels should be drawn for points. This is set internally from startRender() depending on sca...
QFont mLabelFont
Label font.
std::unique_ptr< QgsFeatureRenderer > mRenderer
Embedded base renderer. This can be used for rendering individual, isolated points.
QgsSymbol * originalSymbolForFeature(const QgsFeature &feature, QgsRenderContext &context) const override
Returns symbol for feature.
void setLegendSymbolItem(const QString &key, QgsSymbol *symbol) override
Sets the symbol to be used for a legend symbol item.
QList< QgsPointDistanceRenderer::GroupedFeature > ClusteredGroup
A group of clustered points (ie features within the distance tolerance).
Qgis::RenderUnit mToleranceUnit
Unit for distance tolerance.
bool willRenderFeature(const QgsFeature &feature, QgsRenderContext &context) const override
Returns whether the renderer will render a feature or not.
bool filterNeedsGeometry() const override
Returns true if this renderer requires the geometry to apply the filter.
QSet< QString > legendKeysForFeature(const QgsFeature &feature, QgsRenderContext &context) const override
Returns legend keys matching a specified feature.
bool accept(QgsStyleEntityVisitorInterface *visitor) const override
Accepts the specified symbology visitor, causing it to visit all symbols associated with the renderer...
A class to represent a 2D point.
Point geometry type, with support for z-dimension and m-values.
QgsPoint * clone() const override
Clones the geometry by performing a deep copy.
A rectangle specified with double values.
Contains information about the context of a rendering operation.
double convertToMapUnits(double size, Qgis::RenderUnit unit, const QgsMapUnitScale &scale=QgsMapUnitScale()) const
Converts a size from the specified units to map units.
double convertToPainterUnits(double size, Qgis::RenderUnit unit, const QgsMapUnitScale &scale=QgsMapUnitScale(), Qgis::RenderSubcomponentProperty property=Qgis::RenderSubcomponentProperty::Generic) const
Converts a size from the specified units to painter units (pixels).
QPainter * painter()
Returns the destination QPainter for the render operation.
double rendererScale() const
Returns the renderer map scale.
QgsExpressionContext & expressionContext()
Gets the expression context.
const QgsMapToPixel & mapToPixel() const
Returns the context's map to pixel transform, which transforms between map coordinates and device coo...
bool renderingStopped() const
Returns true if the rendering operation has been stopped and any ongoing rendering should be canceled...
QgsCoordinateTransform coordinateTransform() const
Returns the current coordinate transform for the context.
Scoped object for saving and restoring a QPainter object's state.
A spatial index for QgsFeature objects.
QList< QgsFeatureId > intersects(const QgsRectangle &rectangle) const
Returns a list of features with a bounding box which intersects the specified rectangle.
bool addFeature(QgsFeature &feature, QgsFeatureSink::Flags flags=QgsFeatureSink::Flags()) override
Adds a feature to the index.
An interface for classes which can visit style entity (e.g.
static QString encodeColor(const QColor &color)
QgsRenderContext & renderContext()
Returns a reference to the context's render context.
Abstract base class for all rendered symbols.
Represents a vector layer which manages a vector based data sets.
static Qgis::GeometryType geometryType(Qgis::WkbType type)
Returns the geometry type for a WKB type, e.g., both MultiPolygon and CurvePolygon would have a Polyg...
#define FID_TO_STRING(fid)
qint64 QgsFeatureId
64 bit feature ids negative numbers are used for uncommitted/newly added features
QList< QgsLegendSymbolItem > QgsLegendSymbolList
#define QgsDebugMsgLevel(str, level)
QList< QgsSymbol * > QgsSymbolList
Single variable definition for use within a QgsExpressionContextScope.
Contains properties for a feature within a clustered group.
GroupedFeature(const QgsFeature &feature, QgsMarkerSymbol *symbol, bool isSelected, const QString &label=QString())
Constructor for GroupedFeature.