QgsMeshLayerRenderer Class Reference

Implementation of threaded rendering for mesh layers. More...

#include <qgsmeshlayerrenderer.h>

Inheritance diagram for QgsMeshLayerRenderer:

Public Member Functions
	QgsMeshLayerRenderer (QgsMeshLayer *layer, QgsRenderContext &context)
	Ctor.
	~QgsMeshLayerRenderer () override=default
QgsFeedback *	feedback () const override
	Access to feedback object of the layer renderer (may be nullptr)
bool	forceRasterRender () const override
	Returns true if the renderer must be rendered to a raster paint device (e.g.
bool	render () override
	Do the rendering (based on data stored in the class).
Public Member Functions inherited from QgsMapLayerRenderer
	QgsMapLayerRenderer (const QString &layerID, QgsRenderContext *context=nullptr)
	Constructor for QgsMapLayerRenderer, with the associated layerID and render context.
virtual	~QgsMapLayerRenderer ()
QStringList	errors () const
	Returns list of errors (problems) that happened during the rendering.
virtual Qgis::MapLayerRendererFlags	flags () const
	Returns flags which control how the map layer rendering behaves.
bool	isReadyToCompose () const
	Returns whether the renderer has already drawn (at least partially) some data.
QString	layerId () const
	Gets access to the ID of the layer rendered by this class.
QgsRenderContext *	renderContext ()
	Returns the render context associated with the renderer.
const QgsRenderContext *	renderContext () const
	Returns the render context associated with the renderer.
virtual void	setLayerRenderingTimeHint (int time)
	Sets approximate render time (in ms) for the layer to render.
QList< QgsRenderedItemDetails * >	takeRenderedItemDetails ()
	Takes the list of rendered item details from the renderer.

Protected Attributes
QList< QgsMapClippingRegion >	mClippingRegions
double	mElevationOffset = 0.0
double	mElevationScale = 1.0
bool	mEnableProfile = false
std::unique_ptr< QgsMeshLayerRendererFeedback >	mFeedback
	feedback class for cancellation
QgsRectangle	mLayerExtent
QString	mLayerName
QgsMesh	mNativeMesh
QSize	mOutputSize
quint64	mPreparationTime = 0
bool	mRenderElevationMap = false
QgsMeshRendererSettings	mRendererSettings
QgsMeshDataBlock	mScalarActiveFaceFlagValues
double	mScalarDatasetMaximum = std::numeric_limits<double>::quiet_NaN()
double	mScalarDatasetMinimum = std::numeric_limits<double>::quiet_NaN()
QVector< double >	mScalarDatasetValues
QgsMeshDatasetGroupMetadata::DataType	mScalarDataType = QgsMeshDatasetGroupMetadata::DataOnVertices
QgsTriangularMesh	mTriangularMesh
QgsMeshDataBlock	mVectorActiveFaceFlagValues
double	mVectorDatasetGroupMagMaximum = std::numeric_limits<double>::quiet_NaN()
double	mVectorDatasetGroupMagMinimum = std::numeric_limits<double>::quiet_NaN()
double	mVectorDatasetMagMaximum = std::numeric_limits<double>::quiet_NaN()
double	mVectorDatasetMagMinimum = std::numeric_limits<double>::quiet_NaN()
QgsMeshDataBlock	mVectorDatasetValues
QVector< double >	mVectorDatasetValuesMag
QgsMeshDatasetGroupMetadata::DataType	mVectorDataType = QgsMeshDatasetGroupMetadata::DataOnVertices
Protected Attributes inherited from QgsMapLayerRenderer
QStringList	mErrors
QString	mLayerID
bool	mReadyToCompose = true
	The flag must be set to false in renderer's constructor if wants to use the smarter map redraws functionality https://github.com/qgis/QGIS-Enhancement-Proposals/issues/181.

Additional Inherited Members
Protected Member Functions inherited from QgsMapLayerRenderer
void	appendRenderedItemDetails (QgsRenderedItemDetails *details)
	Appends the details of a rendered item to the renderer.
Static Protected Attributes inherited from QgsMapLayerRenderer
static constexpr int	MAX_TIME_TO_USE_CACHED_PREVIEW_IMAGE = 3000
	Maximum time (in ms) to allow display of a previously cached preview image while rendering layers, before switching to a progressive rendering display.

Detailed Description

Implementation of threaded rendering for mesh layers.

Note

not available in Python bindings

Since

QGIS 3.2

Definition at line 93 of file qgsmeshlayerrenderer.h.

Constructor & Destructor Documentation

QgsMeshLayerRenderer()

QgsMeshLayerRenderer::QgsMeshLayerRenderer	(	QgsMeshLayer *	layer,
		QgsRenderContext &	context
	)

Ctor.

Definition at line 47 of file qgsmeshlayerrenderer.cpp.

~QgsMeshLayerRenderer()

QgsMeshLayerRenderer::~QgsMeshLayerRenderer ( )

overridedefault

Member Function Documentation

feedback()

QgsFeedback * QgsMeshLayerRenderer::feedback ( ) const

overridevirtual

Access to feedback object of the layer renderer (may be nullptr)

Reimplemented from QgsMapLayerRenderer.

Definition at line 181 of file qgsmeshlayerrenderer.cpp.

forceRasterRender()

bool QgsMeshLayerRenderer::forceRasterRender ( ) const

overridevirtual

Returns true if the renderer must be rendered to a raster paint device (e.g.

QImage).

Some layer settings require layers to be effectively "flattened" while rendering maps, which is achieved by first rendering the layer onto a raster paint device and then compositing the resultant image onto the final map render.

E.g. if a layer contains features with transparency or alternative blending modes, and the effects of these opacity or blending modes should be restricted to only affect other features within the SAME layer, then a flattened raster based render is required.

Subclasses should return true whenever their corresponding layer settings require the layer to always be rendered using a raster paint device.

Since

QGIS 3.18

Reimplemented from QgsMapLayerRenderer.

Definition at line 412 of file qgsmeshlayerrenderer.cpp.

render()

bool QgsMeshLayerRenderer::render ( )

overridevirtual

Do the rendering (based on data stored in the class).

Returns true if the layer was completely rendered successfully (i.e. the render was not canceled early).

Implements QgsMapLayerRenderer.

Definition at line 378 of file qgsmeshlayerrenderer.cpp.

Member Data Documentation

mClippingRegions

QList< QgsMapClippingRegion > QgsMeshLayerRenderer::mClippingRegions

protected

Definition at line 164 of file qgsmeshlayerrenderer.h.

mElevationOffset

double QgsMeshLayerRenderer::mElevationOffset = 0.0

protected

Definition at line 170 of file qgsmeshlayerrenderer.h.

mElevationScale

double QgsMeshLayerRenderer::mElevationScale = 1.0

protected

Definition at line 169 of file qgsmeshlayerrenderer.h.

mEnableProfile

bool QgsMeshLayerRenderer::mEnableProfile = false

protected

Definition at line 173 of file qgsmeshlayerrenderer.h.

mFeedback

std::unique_ptr<QgsMeshLayerRendererFeedback> QgsMeshLayerRenderer::mFeedback

protected

feedback class for cancellation

Definition at line 133 of file qgsmeshlayerrenderer.h.

mLayerExtent

QgsRectangle QgsMeshLayerRenderer::mLayerExtent

protected

Definition at line 142 of file qgsmeshlayerrenderer.h.

mLayerName

QString QgsMeshLayerRenderer::mLayerName

protected

Definition at line 130 of file qgsmeshlayerrenderer.h.

mNativeMesh

QgsMesh QgsMeshLayerRenderer::mNativeMesh

protected

Definition at line 136 of file qgsmeshlayerrenderer.h.

mOutputSize

QSize QgsMeshLayerRenderer::mOutputSize

protected

Definition at line 167 of file qgsmeshlayerrenderer.h.

mPreparationTime

quint64 QgsMeshLayerRenderer::mPreparationTime = 0

protected

Definition at line 174 of file qgsmeshlayerrenderer.h.

mRenderElevationMap

bool QgsMeshLayerRenderer::mRenderElevationMap = false

protected

Definition at line 171 of file qgsmeshlayerrenderer.h.

mRendererSettings

QgsMeshRendererSettings QgsMeshLayerRenderer::mRendererSettings

protected

Definition at line 162 of file qgsmeshlayerrenderer.h.

mScalarActiveFaceFlagValues

QgsMeshDataBlock QgsMeshLayerRenderer::mScalarActiveFaceFlagValues

protected

Definition at line 146 of file qgsmeshlayerrenderer.h.

mScalarDatasetMaximum

double QgsMeshLayerRenderer::mScalarDatasetMaximum = std::numeric_limits<double>::quiet_NaN()

protected

Definition at line 149 of file qgsmeshlayerrenderer.h.

mScalarDatasetMinimum

double QgsMeshLayerRenderer::mScalarDatasetMinimum = std::numeric_limits<double>::quiet_NaN()

protected

Definition at line 148 of file qgsmeshlayerrenderer.h.

mScalarDatasetValues

QVector<double> QgsMeshLayerRenderer::mScalarDatasetValues

protected

Definition at line 145 of file qgsmeshlayerrenderer.h.

mScalarDataType

QgsMeshDatasetGroupMetadata::DataType QgsMeshLayerRenderer::mScalarDataType = QgsMeshDatasetGroupMetadata::DataOnVertices

protected

Definition at line 147 of file qgsmeshlayerrenderer.h.

mTriangularMesh

QgsTriangularMesh QgsMeshLayerRenderer::mTriangularMesh

protected

Definition at line 139 of file qgsmeshlayerrenderer.h.

mVectorActiveFaceFlagValues

QgsMeshDataBlock QgsMeshLayerRenderer::mVectorActiveFaceFlagValues

protected

Definition at line 153 of file qgsmeshlayerrenderer.h.

mVectorDatasetGroupMagMaximum

double QgsMeshLayerRenderer::mVectorDatasetGroupMagMaximum = std::numeric_limits<double>::quiet_NaN()

protected

Definition at line 158 of file qgsmeshlayerrenderer.h.

mVectorDatasetGroupMagMinimum

double QgsMeshLayerRenderer::mVectorDatasetGroupMagMinimum = std::numeric_limits<double>::quiet_NaN()

protected

Definition at line 157 of file qgsmeshlayerrenderer.h.

mVectorDatasetMagMaximum

double QgsMeshLayerRenderer::mVectorDatasetMagMaximum = std::numeric_limits<double>::quiet_NaN()

protected

Definition at line 156 of file qgsmeshlayerrenderer.h.

mVectorDatasetMagMinimum

double QgsMeshLayerRenderer::mVectorDatasetMagMinimum = std::numeric_limits<double>::quiet_NaN()

protected

Definition at line 155 of file qgsmeshlayerrenderer.h.

mVectorDatasetValues

QgsMeshDataBlock QgsMeshLayerRenderer::mVectorDatasetValues

protected

Definition at line 152 of file qgsmeshlayerrenderer.h.

mVectorDatasetValuesMag

QVector<double> QgsMeshLayerRenderer::mVectorDatasetValuesMag

protected

Definition at line 154 of file qgsmeshlayerrenderer.h.

mVectorDataType

QgsMeshDatasetGroupMetadata::DataType QgsMeshLayerRenderer::mVectorDataType = QgsMeshDatasetGroupMetadata::DataOnVertices

protected

Definition at line 159 of file qgsmeshlayerrenderer.h.

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

• /build/qgis-3.40.0+99sid/src/core/mesh/qgsmeshlayerrenderer.h
• /build/qgis-3.40.0+99sid/src/core/mesh/qgsmeshlayerrenderer.cpp