Class: QgsMapLayerElevationProperties¶

class qgis.core.QgsMapLayerElevationProperties¶

Bases: PyQt5.QtCore.QObject

Base class for storage of map layer elevation properties.

QgsMapLayerElevationProperties exposes user-configurable settings for controlling how an individual QgsMapLayer behaves with relation to z values or elevations.

New in version 3.18.

QgsMapLayerElevationProperties(parent: QObject) Constructor for QgsMapLayerElevationProperties, with the specified parent object.

Methods

calculateZRange

Attempts to calculate the overall elevation or z range for the specified layer, using the settings defined by this elevation properties object.

childEvent

clone

Creates a clone of the properties.

connectNotify

copyCommonProperties

Copies common properties from another object.

customEvent

dataDefinedProperties

Returns a reference to the object's property collection, used for data defined overrides.

disconnectNotify

flags

Returns flags associated to the elevation properties.

hasElevation

Returns True if the layer has an elevation or z component.

htmlSummary

Returns a HTML formatted summary of the properties.

isSignalConnected

isVisibleInZRange

Returns True if the layer should be visible and rendered for the specified z range.

propertyDefinitions

Returns the definitions for data defined properties available for use in elevation properties.

readCommonProperties

Reads common class properties from a DOM element previously written by writeXml().

readXml

Reads the elevation properties from a DOM element previously written by writeXml().

receivers

sender

senderSignalIndex

setDataDefinedProperties

Sets the object's property collection, used for data defined overrides.

setDefaultsFromLayer

Sets default properties based on sensible choices for the given map layer.

setZOffset

Sets the z offset, which is a fixed offset amount which will be added to z values from the layer.

setZScale

Sets the z scale, which is a scaling factor which will be applied to z values from the layer.

showByDefaultInElevationProfilePlots

Returns True if the layer should be visible by default in newly created elevation profile plots.

timerEvent

writeCommonProperties

Writes common class properties to a DOM element, to be used later with readXml().

writeXml

Writes the properties to a DOM element, to be used later with readXml().

zOffset

Returns the z offset, which is a fixed offset amount which should be added to z values from the layer.

zScale

Returns the z scale, which is a scaling factor which should be applied to z values from the layer.

Signals

changed

Emitted when any of the elevation properties have changed.

profileGenerationPropertyChanged

Emitted when any of the elevation properties which relate solely to generation of elevation profiles have changed.

profileRenderingPropertyChanged

Emitted when any of the elevation properties which relate solely to presentation of elevation results have changed.

zOffsetChanged

Emitted when the z offset changes.

zScaleChanged

Emitted when the z scale changes.

Attributes

ExtrusionHeight

FlagDontInvalidateCachedRendersWhenRangeChanges

ZOffset

ExtrusionHeight = 1¶

class Flag¶: Bases: int

FlagDontInvalidateCachedRendersWhenRangeChanges = 1¶

class Flags¶
class Flags(Union[QgsMapLayerElevationProperties.Flags, QgsMapLayerElevationProperties.Flag])
class Flags(QgsMapLayerElevationProperties.Flags): Bases: sip.wrapper

class Property¶: Bases: int

ZOffset = 0¶

calculateZRange(self, layer: QgsMapLayer) → QgsDoubleRange¶

Attempts to calculate the overall elevation or z range for the specified layer, using the settings defined by this elevation properties object.

May return an infinite range if the extent could not be calculated.

Parameters: layer (QgsMapLayer) –
Return type: QgsDoubleRange

changed¶

Emitted when any of the elevation properties have changed.

See renderingPropertyChanged() and profileGenerationPropertyChanged() for more fine-grained signals. [signal]

childEvent(self, QChildEvent)¶

clone(self) → QgsMapLayerElevationProperties¶

Creates a clone of the properties.

New in version 3.26.

Return type: QgsMapLayerElevationProperties

connectNotify(self, QMetaMethod)¶

copyCommonProperties(self, other: QgsMapLayerElevationProperties)¶

Copies common properties from another object.

New in version 3.26.

Parameters: other (QgsMapLayerElevationProperties) –

customEvent(self, QEvent)¶

dataDefinedProperties(self) → QgsPropertyCollection¶

Returns a reference to the object’s property collection, used for data defined overrides.

See also

setDataDefinedProperties()

New in version 3.26.

Return type: QgsPropertyCollection

disconnectNotify(self, QMetaMethod)¶

flags(self) → QgsMapLayerElevationProperties.Flags¶

Returns flags associated to the elevation properties.

Return type: QgsMapLayerElevationProperties.Flags

hasElevation(self) → bool¶

Returns True if the layer has an elevation or z component.

Return type: bool

htmlSummary(self) → str¶

Returns a HTML formatted summary of the properties.

New in version 3.26.

Return type: str

isSignalConnected(self, QMetaMethod) → bool¶

isVisibleInZRange(self, range: QgsDoubleRange) → bool¶

Returns True if the layer should be visible and rendered for the specified z range.

Parameters: range (QgsDoubleRange) –
Return type: bool

profileGenerationPropertyChanged¶: Emitted when any of the elevation properties which relate solely to generation of elevation profiles have changed.

See also

changed()

See also

profileRenderingPropertyChanged()

New in version 3.26: [signal]

profileRenderingPropertyChanged¶: Emitted when any of the elevation properties which relate solely to presentation of elevation results have changed.

See also

changed()

See also

profileGenerationPropertyChanged()

New in version 3.26: [signal]

propertyDefinitions() → Dict[int, QgsPropertyDefinition]¶

Returns the definitions for data defined properties available for use in elevation properties.

New in version 3.26.

Return type: Dict[int, QgsPropertyDefinition]

readCommonProperties(self, element: QDomElement, context: QgsReadWriteContext)¶

Reads common class properties from a DOM element previously written by writeXml().

See also

writeCommonProperties()

New in version 3.26.

Parameters

element (QDomElement) –
context (QgsReadWriteContext) –

readXml(self, element: QDomElement, context: QgsReadWriteContext) → bool¶

Reads the elevation properties from a DOM element previously written by writeXml().

See also

writeXml()

Parameters

element (QDomElement) –
context (QgsReadWriteContext) –

Return type

bool

receivers(self, PYQT_SIGNAL) → int¶

sender(self) → QObject¶

senderSignalIndex(self) → int¶

setDataDefinedProperties(self, collection: QgsPropertyCollection)¶

Sets the object’s property collection, used for data defined overrides.

Any existing properties will be discarded.

See also

dataDefinedProperties()

See also

Property

New in version 3.26.

Parameters: collection (QgsPropertyCollection) –

setDefaultsFromLayer(self, layer: QgsMapLayer)¶

Sets default properties based on sensible choices for the given map layer.

New in version 3.26.

Parameters: layer (QgsMapLayer) –

setZOffset(self, offset: float)¶

Sets the z offset, which is a fixed offset amount which will be added to z values from the layer.

Note

Any scaling specified via zScale() is applied before any offset value specified via zOffset()

See also

zOffset()

Parameters: offset (float) –

setZScale(self, scale: float)¶

Sets the z scale, which is a scaling factor which will be applied to z values from the layer.

This can be used to correct or manually adjust for incorrect elevation values in a layer, such as conversion of elevation values in feet to meters.

Note

Any scaling specified via zScale() is applied before any offset value specified via zOffset()

See also

zScale()

Parameters: scale (float) –

showByDefaultInElevationProfilePlots(self) → bool¶

Returns True if the layer should be visible by default in newly created elevation profile plots.

Subclasses should override this with logic which determines whether the layer is likely desirable to be initially checked in these plots.

New in version 3.26.

Return type: bool

timerEvent(self, QTimerEvent)¶

writeCommonProperties(self, element: QDomElement, doc: QDomDocument, context: QgsReadWriteContext)¶

Writes common class properties to a DOM element, to be used later with readXml().

See also

readCommonProperties()

New in version 3.26.

Parameters

element (QDomElement) –
doc (QDomDocument) –
context (QgsReadWriteContext) –

writeXml(self, element: QDomElement, doc: QDomDocument, context: QgsReadWriteContext) → QDomElement¶

Writes the properties to a DOM element, to be used later with readXml().

See also

readXml()

Parameters

element (QDomElement) –
doc (QDomDocument) –
context (QgsReadWriteContext) –

Return type

QDomElement

zOffset(self) → float¶

Returns the z offset, which is a fixed offset amount which should be added to z values from the layer.

Note

Any scaling specified via zScale() is applied before any offset value specified via zOffset()

See also

setZOffset()

Return type: float

zOffsetChanged¶: Emitted when the z offset changes.

New in version 3.26: [signal]

zScale(self) → float¶

Returns the z scale, which is a scaling factor which should be applied to z values from the layer.

This can be used to correct or manually adjust for incorrect elevation values in a layer, such as conversion of elevation values in feet to meters.

Note

Any scaling specified via zScale() is applied before any offset value specified via zOffset()

See also

setZScale()

Return type: float

zScaleChanged¶: Emitted when the z scale changes.

New in version 3.26: [signal]