Class: QgsPointCloudRenderer

class qgis.core.QgsPointCloudRenderer

Bases: sip.wrapper

Abstract base class for 2d point cloud renderers.

New in version 3.18.

QgsPointCloudRenderer() Constructor for QgsPointCloudRenderer.

Enums

DrawOrder	alias of PointCloudDrawOrder
PointSymbol	alias of PointCloudSymbol

Methods

checkLegendItem	Called when the check state of the legend item with the specified key is changed.
clone	Create a deep copy of this renderer.
copyCommonProperties	Copies common point cloud properties (such as point size and screen error) to the destination renderer.
createLegendNodes	Creates a set of legend nodes representing the renderer.
drawOrder2d	Returns the drawing order used by the renderer for drawing points.
drawPoint	Draws a point using a color at the specified x and y (in map coordinates).
legendItemChecked	Returns True if the legend item with the specified key is checked.
legendRuleKeys	Returns a list of all rule keys for legend nodes created by the renderer.
load	Creates a renderer from an XML element.
maximumScreenError	Returns the maximum screen error allowed when rendering the point cloud.
maximumScreenErrorUnit	Returns the unit for the maximum screen error allowed when rendering the point cloud.
pointSize	Returns the point size.
pointSizeMapUnitScale	Returns the map unit scale used for the point size.
pointSizeUnit	Returns the units used for the point size.
pointSymbol	Returns the symbol used by the renderer for drawing points.
pointXY	Retrieves the x and y coordinate for the point at index i.
pointZ	Retrieves the z value for the point at index i.
renderBlock	Renders a block of point cloud data using the specified render context.
restoreCommonProperties	Restores common renderer properties (such as point size and screen error) from the specified DOM element.
save	Saves the renderer configuration to an XML element.
saveCommonProperties	Saves common renderer properties (such as point size and screen error) to the specified DOM element.
setDrawOrder2d	Sets the drawing order used by the renderer for drawing points.
setMaximumScreenError	Sets the maximum screen error allowed when rendering the point cloud.
setMaximumScreenErrorUnit	Sets the unit for the maximum screen error allowed when rendering the point cloud.
setPointSize	Sets the point size.
setPointSizeMapUnitScale	Sets the map unit scale used for the point size.
setPointSizeUnit	Sets the units used for the point size.
setPointSymbol	Sets the symbol used by the renderer for drawing points.
startRender	Must be called when a new render cycle is started.
stopRender	Must be called when a render cycle has finished, to allow the renderer to clean up.
type	Returns the identifier of the renderer type.
usedAttributes	Returns a list of attributes required by this renderer.
willRenderPoint	Checks whether the point holding pointAttributes attributes will be rendered By default if not overridden in the subclass renderer will return true ( the renderer is responsible for the filtering behavior )

DrawOrder

alias of PointCloudDrawOrder

PointSymbol

alias of PointCloudSymbol

checkLegendItem(self, key: str, state: bool = True)

Called when the check state of the legend item with the specified key is changed.

See also

legendItemChecked()

Parameters:

• key (str) –

• state (bool = True) –

clone(self) → QgsPointCloudRenderer

Create a deep copy of this renderer. Should be implemented by all subclasses and generate a proper subclass.

Return type:

QgsPointCloudRenderer

copyCommonProperties(self, destination: QgsPointCloudRenderer)

Copies common point cloud properties (such as point size and screen error) to the destination renderer.

Parameters:

destination (QgsPointCloudRenderer) –

createLegendNodes(self, nodeLayer: QgsLayerTreeLayer) → List[QgsLayerTreeModelLegendNode]

Creates a set of legend nodes representing the renderer.

Parameters:

nodeLayer (QgsLayerTreeLayer) –

Return type:

List[QgsLayerTreeModelLegendNode]

drawOrder2d(self) → Qgis.PointCloudDrawOrder

Returns the drawing order used by the renderer for drawing points.

See also

setDrawOrder2d()

New in version 3.24.

Return type:

Qgis.PointCloudDrawOrder

drawPoint(self, x: float, y: float, color: QColor | Qt.GlobalColor | QGradient, context: QgsPointCloudRenderContext)

Draws a point using a color at the specified x and y (in map coordinates).

Parameters:

• x (float) –

• y (float) –

• color (Union[QColor) –

• context (QgsPointCloudRenderContext) –

legendItemChecked(self, key: str) → bool

Returns True if the legend item with the specified key is checked.

See also

checkLegendItem()

Parameters:

key (str) –

Return type:

bool

legendRuleKeys(self) → List[str]

Returns a list of all rule keys for legend nodes created by the renderer.

Return type:

List[str]

load(element: QDomElement, context: QgsReadWriteContext) → QgsPointCloudRenderer

Creates a renderer from an XML element.

Caller takes ownership of the returned renderer.

See also

save()

Parameters:

• element (QDomElement) –

• context (QgsReadWriteContext) –

Return type:

QgsPointCloudRenderer

maximumScreenError(self) → float

Returns the maximum screen error allowed when rendering the point cloud.

Larger values result in a faster render with less points rendered.

Units are retrieved via maximumScreenErrorUnit().

See also

setMaximumScreenError()

See also

maximumScreenErrorUnit()

Return type:

float

maximumScreenErrorUnit(self) → Qgis.RenderUnit

Returns the unit for the maximum screen error allowed when rendering the point cloud.

See also

maximumScreenError()

See also

setMaximumScreenErrorUnit()

Return type:

Qgis.RenderUnit

pointSize(self) → float

Returns the point size.

The point size units are retrieved by calling pointSizeUnit().

See also

setPointSize()

See also

pointSizeUnit()

See also

pointSizeMapUnitScale()

Return type:

float

pointSizeMapUnitScale(self) → QgsMapUnitScale

Returns the map unit scale used for the point size.

See also

setPointSizeMapUnitScale()

See also

pointSizeUnit()

See also

pointSize()

Return type:

QgsMapUnitScale

pointSizeUnit(self) → Qgis.RenderUnit

Returns the units used for the point size.

See also

setPointSizeUnit()

See also

pointSize()

See also

pointSizeMapUnitScale()

Return type:

Qgis.RenderUnit

pointSymbol(self) → Qgis.PointCloudSymbol

Returns the symbol used by the renderer for drawing points.

See also

setPointSymbol()

Return type:

Qgis.PointCloudSymbol

pointXY(context: QgsPointCloudRenderContext, ptr: str, i: int) → Tuple[float, float]

Retrieves the x and y coordinate for the point at index i.

Parameters:

• context (QgsPointCloudRenderContext) –

• ptr (str) –

• i (int) –

Return type:

Tuple[float, float]

pointZ(context: QgsPointCloudRenderContext, ptr: str, i: int) → float

Retrieves the z value for the point at index i.

Parameters:

• context (QgsPointCloudRenderContext) –

• ptr (str) –

• i (int) –

Return type:

float

renderBlock(self, block: QgsPointCloudBlock, context: QgsPointCloudRenderContext)

Renders a block of point cloud data using the specified render context.

Parameters:

• block (QgsPointCloudBlock) –

• context (QgsPointCloudRenderContext) –

restoreCommonProperties(self, element: QDomElement, context: QgsReadWriteContext)

Restores common renderer properties (such as point size and screen error) from the specified DOM element.

See also

saveCommonProperties()

Parameters:

• element (QDomElement) –

• context (QgsReadWriteContext) –

save(self, doc: QDomDocument, context: QgsReadWriteContext) → QDomElement

Saves the renderer configuration to an XML element.

See also

load()

Parameters:

• doc (QDomDocument) –

• context (QgsReadWriteContext) –

Return type:

QDomElement

saveCommonProperties(self, element: QDomElement, context: QgsReadWriteContext)

Saves common renderer properties (such as point size and screen error) to the specified DOM element.

See also

restoreCommonProperties()

Parameters:

• element (QDomElement) –

• context (QgsReadWriteContext) –

setDrawOrder2d(self, order: Qgis.PointCloudDrawOrder)

Sets the drawing order used by the renderer for drawing points.

See also

drawOrder2d()

New in version 3.24.

Parameters:

order (Qgis.PointCloudDrawOrder) –

setMaximumScreenError(self, error: float)

Sets the maximum screen error allowed when rendering the point cloud.

Larger values result in a faster render with less points rendered.

Units are set via setMaximumScreenErrorUnit().

See also

maximumScreenError()

See also

setMaximumScreenErrorUnit()

Parameters:

error (float) –

setMaximumScreenErrorUnit(self, unit: Qgis.RenderUnit)

Sets the unit for the maximum screen error allowed when rendering the point cloud.

See also

setMaximumScreenError()

See also

maximumScreenErrorUnit()

Parameters:

unit (Qgis.RenderUnit) –

setPointSize(self, size: float)

Sets the point size. Point size units are specified via setPointSizeUnit().

See also

pointSize()

See also

setPointSizeUnit()

See also

setPointSizeMapUnitScale()

Parameters:

size (float) –

setPointSizeMapUnitScale(self, scale: QgsMapUnitScale)

Sets the map unit scale used for the point size.

See also

pointSizeMapUnitScale()

See also

setPointSize()

See also

setPointSizeUnit()

Parameters:

scale (QgsMapUnitScale) –

setPointSizeUnit(self, units: Qgis.RenderUnit)

Sets the units used for the point size.

See also

setPointSize()

See also

pointSizeUnit()

See also

setPointSizeMapUnitScale()

Parameters:

units (Qgis.RenderUnit) –

setPointSymbol(self, symbol: Qgis.PointCloudSymbol)

Sets the symbol used by the renderer for drawing points.

See also

pointSymbol()

Parameters:

symbol (Qgis.PointCloudSymbol) –

startRender(self, context: QgsPointCloudRenderContext)

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.

See also

stopRender()

Warning

This method is not thread safe. Before calling startRender() in a non-main thread, the renderer should instead be cloned and startRender()/stopRender() called on the clone.

Parameters:

context (QgsPointCloudRenderContext) –

stopRender(self, context: QgsPointCloudRenderContext)

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().

Warning

This method is not thread safe. Before calling startRender() in a non-main thread, the renderer should instead be cloned and startRender()/stopRender() called on the clone.

See also

startRender()

Parameters:

context (QgsPointCloudRenderContext) –

type(self) → str

Returns the identifier of the renderer type.

Return type:

str

usedAttributes(self, context: QgsPointCloudRenderContext) → Set[str]

Returns a list of attributes required by this renderer. Attributes not listed in here may not be requested from the provider at rendering time.

Note

the “X” and “Y” attributes will always be fetched and do not need to be explicitly returned here.

Parameters:

context (QgsPointCloudRenderContext) –

Return type:

Set[str]

willRenderPoint(self, pointAttributes: Dict[str, Any]) → bool

Checks whether the point holding pointAttributes attributes will be rendered By default if not overridden in the subclass renderer will return true ( the renderer is responsible for the filtering behavior )

Parameters:

pointAttributes (Dict[str) –

Return type:

bool