QValue3DAxisFormatter

The QValue3DAxisFormatter class is a base class for value axis formatters. More…

Inherited by: QLogValue3DAxisFormatter

Synopsis

Functions

• def allowNegatives ()

• def allowZero ()

• def axis ()

• def gridPositions ()

• def labelPositions ()

• def labelStrings ()

• def locale ()

• def markDirty ([labelsChange=false])

• def setAllowNegatives (allow)

• def setAllowZero (allow)

• def setLocale (locale)

• def subGridPositions ()

Virtual functions

• def createNewInstance ()

• def populateCopy (copy)

• def positionAt (value)

• def recalculate ()

• def stringForValue (value, format)

• def valueAt (position)

Detailed Description

This class provides formatting rules for a linear value 3D axis. Subclass it if you want to implement custom value axes.

The base class has no public API beyond constructors and destructors. It is meant to be only used internally. However, subclasses may implement public properties as needed.

See also

QValue3DAxis QLogValue3DAxisFormatter

class PySide6.QtDataVisualization.QValue3DAxisFormatter([parent=None])

Parameters

parent – PySide6.QtCore.QObject

Constructs a new value 3D axis formatter with the optional parent parent.

PySide6.QtDataVisualization.QValue3DAxisFormatter.allowNegatives()

Return type

bool

Returns true if negative values are valid values for the parent axis. The default implementation always returns true.

See also

setAllowNegatives()

PySide6.QtDataVisualization.QValue3DAxisFormatter.allowZero()

Return type

bool

Returns true if zero is a valid value for the parent axis. The default implementation always returns true.

See also

setAllowZero()

PySide6.QtDataVisualization.QValue3DAxisFormatter.axis()

Return type

PySide6.QtDataVisualization.QValue3DAxis

Returns the parent axis. The parent axis must only be accessed in the recalculate() method to maintain thread safety in environments using a threaded renderer.

See also

recalculate()

PySide6.QtDataVisualization.QValue3DAxisFormatter.createNewInstance()

Return type

PySide6.QtDataVisualization.QValue3DAxisFormatter

Creates a new empty value 3D axis formatter. Must be reimplemented in a subclass.

Returns the new formatter. The renderer uses this method to cache a copy of the formatter. The ownership of the new copy is transferred to the caller.

PySide6.QtDataVisualization.QValue3DAxisFormatter.gridPositions()

Return type

Returns a reference to the array of normalized grid line positions. The default array size is equal to the segment count of the parent axis plus one, but a subclassed implementation of the recalculate() method may resize the array differently. The values should be between 0.0 (the minimum value) and 1.0 (the maximum value), inclusive.

See also

segmentCount recalculate()

PySide6.QtDataVisualization.QValue3DAxisFormatter.labelPositions()

Return type

Returns a reference to the array of normalized label positions. The default array size is equal to the segment count of the parent axis plus one, but a subclassed implementation of the recalculate() method may resize the array differently. The values should be between 0.0 (the minimum value) and 1.0 (the maximum value), inclusive. By default, the label at the index zero corresponds to the minimum value of the axis.

See also

segmentCount labels recalculate()

PySide6.QtDataVisualization.QValue3DAxisFormatter.labelStrings()

Return type

list of strings

Returns a reference to the string list containing formatter label strings. The array size must be equal to the size of the label positions array, which the indexes also correspond to.

See also

labelPositions()

PySide6.QtDataVisualization.QValue3DAxisFormatter.locale()

Return type

PySide6.QtCore.QLocale

Returns the current locale this formatter is using.

See also

setLocale()

PySide6.QtDataVisualization.QValue3DAxisFormatter.markDirty([labelsChange=false])

Parameters

labelsChange – bool

Marks this formatter dirty, prompting the renderer to make a new copy of its cache on the next renderer synchronization. This method should be called by a subclass whenever the formatter is changed in a way that affects the resolved values. Set labelsChange to true if the change requires regenerating the parent axis label strings.

PySide6.QtDataVisualization.QValue3DAxisFormatter.populateCopy(copy)

Parameters

copy – PySide6.QtDataVisualization.QValue3DAxisFormatter

Copies all the values necessary for resolving positions, values, and strings with this formatter to the copy of the formatter. When reimplementing this method in a subclass, call the superclass version at some point. The renderer uses this method to cache a copy of the formatter.

Returns the new copy. The ownership of the new copy transfers to the caller.

PySide6.QtDataVisualization.QValue3DAxisFormatter.positionAt(value)

Parameters

value – float

Return type

float

Returns the normalized position along the axis for the given value. The returned value should be between 0.0 (the minimum value) and 1.0 (the maximum value), inclusive, if the value is within the parent axis range.

Reimplement this method if the position cannot be resolved by linear interpolation between the parent axis minimum and maximum values.

See also

recalculate() valueAt()

PySide6.QtDataVisualization.QValue3DAxisFormatter.recalculate()

Resizes and populates the label and grid line position arrays and the label strings array, as well as calculates any values needed to map a value to its position. The parent axis can be accessed from inside this function.

This method must be reimplemented in a subclass if the default array contents are not suitable.

See gridPositions() , subGridPositions() , labelPositions() , and labelStrings() methods for documentation about the arrays that need to be resized and populated.

See also

gridPositions() subGridPositions() labelPositions() labelStrings() axis()

PySide6.QtDataVisualization.QValue3DAxisFormatter.setAllowNegatives(allow)

Parameters

allow – bool

Allows the parent axis to have negative values if allow is true.

See also

allowNegatives()

PySide6.QtDataVisualization.QValue3DAxisFormatter.setAllowZero(allow)

Parameters

allow – bool

Allows the parent axis to have a zero value if allow is true.

See also

allowZero()

PySide6.QtDataVisualization.QValue3DAxisFormatter.setLocale(locale)

Parameters

locale – PySide6.QtCore.QLocale

Sets the locale that this formatter uses. The graph automatically sets the formatter’s locale to a graph’s locale whenever the parent axis is set as an active axis of the graph, the axis formatter is set to an axis attached to the graph, or the graph’s locale changes.

See also

locale() locale

PySide6.QtDataVisualization.QValue3DAxisFormatter.stringForValue(value, format)

Parameters

• value – float

• format – str

Return type

str

Returns the formatted label string using the specified value and format.

Reimplement this method in a subclass to resolve the formatted string for a given value if the default formatting rules specified for labelFormat property are not sufficient.

See also

recalculate() labelStrings() labelFormat

PySide6.QtDataVisualization.QValue3DAxisFormatter.subGridPositions()

Return type

Returns a reference to the array of normalized subgrid line positions. The default array size is equal to the segment count of the parent axis times the sub-segment count of the parent axis minus one, but a subclassed implementation of the recalculate() method may resize the array differently. The values should be between 0.0 (the minimum value) and 1.0 (the maximum value), inclusive.

See also

segmentCount subSegmentCount recalculate()

PySide6.QtDataVisualization.QValue3DAxisFormatter.valueAt(position)

Parameters

position – float

Return type

float

Returns the value at the normalized position along the axis. The position value should be between 0.0 (the minimum value) and 1.0 (the maximum value), inclusive, to obtain values within the parent axis range.

Reimplement this method if the value cannot be resolved by linear interpolation between the parent axis minimum and maximum values.

See also

recalculate() positionAt()