QgsMapClippingUtils Class Reference

Utility functions for use when clipping map renders. More...

#include <qgsmapclippingutils.h>

Static Public Member Functions
static QgsGeometry	calculateFeatureIntersectionGeometry (const QList< QgsMapClippingRegion > &regions, const QgsRenderContext &context, bool &shouldClip)
	Returns the geometry representing the intersection of clipping regions from context which should be used to clip individual feature geometries prior to rendering.
static QgsGeometry	calculateFeatureRequestGeometry (const QList< QgsMapClippingRegion > &regions, const QgsRenderContext &context, bool &shouldFilter)
	Returns the geometry representing the intersection of clipping regions from context.
static QgsGeometry	calculateLabelIntersectionGeometry (const QList< QgsMapClippingRegion > &regions, const QgsRenderContext &context, bool &shouldClip)
	Returns the geometry representing the intersection of clipping regions from context which should be used to clip individual feature geometries while registering them with labeling engines.
static QPainterPath	calculatePainterClipRegion (const QList< QgsMapClippingRegion > &regions, const QgsRenderContext &context, Qgis::LayerType layerType, bool &shouldClip)
	Returns a QPainterPath representing the intersection of clipping regions from context which should be used to clip the painter during rendering of a layer of the specified layerType.
static QList< QgsMapClippingRegion >	collectClippingRegionsForLayer (const QgsRenderContext &context, const QgsMapLayer *layer)
	Collects the list of map clipping regions from a context which apply to a map layer.

Detailed Description

Utility functions for use when clipping map renders.

Since

QGIS 3.16

Definition at line 39 of file qgsmapclippingutils.h.

Member Function Documentation

calculateFeatureIntersectionGeometry()

QgsGeometry QgsMapClippingUtils::calculateFeatureIntersectionGeometry ( const QList< QgsMapClippingRegion > &  regions, const QgsRenderContext &  context, bool &  shouldClip  )

static

Returns the geometry representing the intersection of clipping regions from context which should be used to clip individual feature geometries prior to rendering.

The returned geometry will be automatically reprojected into the same CRS as the source layer, ready for use for clipping features.

Parameters

regions	list of clip regions which apply to the layer
context	a render context
shouldClip	will be set to true if layer's features should be filtered, i.e. one or more clipping regions applies to the layer

Returns

combined clipping region for use when rendering features

Definition at line 81 of file qgsmapclippingutils.cpp.

calculateFeatureRequestGeometry()

QgsGeometry QgsMapClippingUtils::calculateFeatureRequestGeometry ( const QList< QgsMapClippingRegion > &  regions, const QgsRenderContext &  context, bool &  shouldFilter  )

static

Returns the geometry representing the intersection of clipping regions from context.

The returned geometry will be automatically reprojected into the same CRS as the source layer, ready for use for filtering a feature request.

Parameters

regions	list of clip regions which apply to the layer
context	a render context
shouldFilter	will be set to true if layer's features should be filtered, i.e. one or more clipping regions applies to the layer

Returns

combined clipping region for use when filtering features to render

Definition at line 38 of file qgsmapclippingutils.cpp.

calculateLabelIntersectionGeometry()

QgsGeometry QgsMapClippingUtils::calculateLabelIntersectionGeometry ( const QList< QgsMapClippingRegion > &  regions, const QgsRenderContext &  context, bool &  shouldClip  )

static

Returns the geometry representing the intersection of clipping regions from context which should be used to clip individual feature geometries while registering them with labeling engines.

The returned geometry will be automatically reprojected into the same CRS as the source layer, ready for use for clipping features.

Parameters

regions	list of clip regions which apply to the layer
context	a render context
shouldClip	will be set to true if layer's features should be clipped for labeling, i.e. one or more clipping regions applies to the layer

Returns

combined clipping region for use when labeling features

Definition at line 183 of file qgsmapclippingutils.cpp.

calculatePainterClipRegion()

QPainterPath QgsMapClippingUtils::calculatePainterClipRegion ( const QList< QgsMapClippingRegion > &  regions, const QgsRenderContext &  context, Qgis::LayerType  layerType, bool &  shouldClip  )

static

Returns a QPainterPath representing the intersection of clipping regions from context which should be used to clip the painter during rendering of a layer of the specified layerType.

The returned coordinates are in painter coordinates for the destination context.

Parameters

regions	list of clip regions which apply to the layer
context	a render context
shouldClip	will be set to true if the clipping path should be applied
layerType	the layer type to filter

Returns

combined painter clipping region for use when rendering maps

Definition at line 127 of file qgsmapclippingutils.cpp.

collectClippingRegionsForLayer()

QList< QgsMapClippingRegion > QgsMapClippingUtils::collectClippingRegionsForLayer ( const QgsRenderContext &  context, const QgsMapLayer *  layer  )

static

Collects the list of map clipping regions from a context which apply to a map layer.

Definition at line 24 of file qgsmapclippingutils.cpp.

---

The documentation for this class was generated from the following files:

• /build/qgis-3.41.0+git20241225+af5edcb665c+99sid/src/core/qgsmapclippingutils.h
• /build/qgis-3.41.0+git20241225+af5edcb665c+99sid/src/core/qgsmapclippingutils.cpp