QGIS API Documentation  3.20.0-Odense (decaadbb31)
Public Member Functions | Protected Attributes | List of all members
QgsMeshLayerRenderer Class Reference
core library

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

#include <qgsmeshlayerrenderer.h>

Inheritance diagram for QgsMeshLayerRenderer:
Inheritance graph
[legend]

Public Member Functions

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

Protected Attributes

QList< QgsMapClippingRegion > mClippingRegions
 
std::unique_ptr< QgsMeshLayerRendererFeedback > mFeedback
 feedback class for cancellation More...
 
QgsRectangle mLayerExtent
 
QgsMesh mNativeMesh
 
QSize mOutputSize
 
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
 
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. More...
 

Additional Inherited Members

- 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. More...
 

Detailed Description

Implementation of threaded rendering for mesh layers.

Note
not available in Python bindings
Since
QGIS 3.2

Definition at line 91 of file qgsmeshlayerrenderer.h.

Constructor & Destructor Documentation

◆ QgsMeshLayerRenderer()

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

Ctor.

Definition at line 46 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)

Since
QGIS 3.0

Reimplemented from QgsMapLayerRenderer.

Definition at line 98 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 311 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 291 of file qgsmeshlayerrenderer.cpp.

Member Data Documentation

◆ mClippingRegions

QList< QgsMapClippingRegion > QgsMeshLayerRenderer::mClippingRegions
protected

Definition at line 150 of file qgsmeshlayerrenderer.h.

◆ mFeedback

std::unique_ptr<QgsMeshLayerRendererFeedback> QgsMeshLayerRenderer::mFeedback
protected

feedback class for cancellation

Definition at line 120 of file qgsmeshlayerrenderer.h.

◆ mLayerExtent

QgsRectangle QgsMeshLayerRenderer::mLayerExtent
protected

Definition at line 129 of file qgsmeshlayerrenderer.h.

◆ mNativeMesh

QgsMesh QgsMeshLayerRenderer::mNativeMesh
protected

Definition at line 123 of file qgsmeshlayerrenderer.h.

◆ mOutputSize

QSize QgsMeshLayerRenderer::mOutputSize
protected

Definition at line 153 of file qgsmeshlayerrenderer.h.

◆ mRendererSettings

QgsMeshRendererSettings QgsMeshLayerRenderer::mRendererSettings
protected

Definition at line 148 of file qgsmeshlayerrenderer.h.

◆ mScalarActiveFaceFlagValues

QgsMeshDataBlock QgsMeshLayerRenderer::mScalarActiveFaceFlagValues
protected

Definition at line 133 of file qgsmeshlayerrenderer.h.

◆ mScalarDatasetMaximum

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

Definition at line 136 of file qgsmeshlayerrenderer.h.

◆ mScalarDatasetMinimum

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

Definition at line 135 of file qgsmeshlayerrenderer.h.

◆ mScalarDatasetValues

QVector<double> QgsMeshLayerRenderer::mScalarDatasetValues
protected

Definition at line 132 of file qgsmeshlayerrenderer.h.

◆ mScalarDataType

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

Definition at line 134 of file qgsmeshlayerrenderer.h.

◆ mTriangularMesh

QgsTriangularMesh QgsMeshLayerRenderer::mTriangularMesh
protected

Definition at line 126 of file qgsmeshlayerrenderer.h.

◆ mVectorDatasetGroupMagMaximum

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

Definition at line 144 of file qgsmeshlayerrenderer.h.

◆ mVectorDatasetGroupMagMinimum

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

Definition at line 143 of file qgsmeshlayerrenderer.h.

◆ mVectorDatasetMagMaximum

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

Definition at line 142 of file qgsmeshlayerrenderer.h.

◆ mVectorDatasetMagMinimum

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

Definition at line 141 of file qgsmeshlayerrenderer.h.

◆ mVectorDatasetValues

QgsMeshDataBlock QgsMeshLayerRenderer::mVectorDatasetValues
protected

Definition at line 139 of file qgsmeshlayerrenderer.h.

◆ mVectorDatasetValuesMag

QVector<double> QgsMeshLayerRenderer::mVectorDatasetValuesMag
protected

Definition at line 140 of file qgsmeshlayerrenderer.h.

◆ mVectorDataType

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

Definition at line 145 of file qgsmeshlayerrenderer.h.

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