nuke.curveknob.CurveKnob

class nuke.curveknob.CurveKnob

Bases: Knob

The knob which holds the tree of paint elements (Layers, Shapes and Strokes).

Most operations are performed on the tree itself, or its elements, rather than through the knob. You can get the root of the tree through the knob’s rootLayer property, or you can get straight to a specific element using the toElement() method.

A common usage scenario is as follows:

>>> knob = nuke.toNode('RotoPaint1')['curves']
>>> root = knob.rootLayer
>>> # perform operations on the root layer.

Creating any new shapes, strokes or layers will require you to pass in a reference to the knob, so it’s worth storing the reference in a variable.

Methods

Class	return Class name.
ClassID	return Class ID.
changed	Call this after performing updates on the tree, to tell it that it's been updated.
clearAnimated	Clear animation for channel 'c'.
clearFlag	Clear flag.
critical	param message message to put the knob in error, and do a popup.
debug	param message message to put out to the error console, attached to the knob, if the verbosity level is set high enough.
enabled	return True if the knob is enabled, False if it's disabled.
error	param message message to put the knob in error.
fromScript	Initialise from script.
fullyQualifiedName	Returns the fully-qualified name of the knob within the node.
getAuthorMode	Returns the authoring mode currently set on the knob.
getAuthorModes	Returns the names of the authoring modes of the knob if the knob is an authoring knob, otherwise an empty list.
getDerivative	Return derivative at time 't' for channel 'c'.
getFlag	Returns whether the input flag is set.
getIntegral	Return integral at the interval [t1, t2] for channel 'c'.
getKeyIndex	Return keyframe index at time 't' for channel 'c'.
getKeyList	Get all unique keys on the knob.
getKeyTime	Return index of the keyframe at time 't' for channel 'c'.
getNthDerivative	Return nth derivative at time 't' for channel 'c'.
getNumKeys	Return number of keyframes for channel 'c'.
getSelected	Returns list of all selected items in a curve knob As an example, say you have a Bezier curve selected,the following will return 'Bezier1' >>> curveKnob = nuke.toNode('RotoPaint1)['curves'] >>> selected = curveKnob.getSelected() >>> selected[0].name
getValue	Return value at the current frame for channel 'c'.
getValueAt	Return value at time 't' for channel 'c'.
hasExpression	Return True if animation at index 'index' has an expression.
isAnimated	Return True if channel 'c' is animated.
isKey	Return True if there is a keyframe at the current frame for channel 'c'.
isKeyAt	Return True if there is a keyframe at time 't' for channel 'c'.
label	return label.
makeWidget	Returns an instance of the QWidget subclass used to edit the knob's value.
name	return name.
node	Return the node that this knob belongs to.
removeKey	Remove key for channel 'c'.
removeKeyAt	Remove key at time 't' for channel 'c'.
setAnimated	Set channel 'c' to be animated.
setAuthorMode	Sets the authoring mode on the knob.
setEnabled	Enable or disable the knob.
setExpression	Set the expression for a knob.
setFlag	Logical OR of the argument and existing knob flags.
setLabel	param s New label.
setName	param s New name.
setTooltip	param s New tooltip.
setValue	Sets the value 'val' at channel 'chan'.
setValueAt	Sets the value 'val' at channel 'chan' for time 'time'.
setVisible	Show or hide the knob.
toElement	Takes a path which identifies a particular element in the curve tree and returns the corresponding Layer, Stroke or Shape object.
toScript	Return the value of the knob in script syntax.
tooltip	return tooltip.
value	Return value at the current frame for channel 'c'.
visible	return True if the knob is visible, False if it's hidden.
warning	param message message to put a warning on the knob.

Attributes

curveWidget	Curve Widget
rootLayer	The root layer.

Class() → Class name.

Returns

Class name.

ClassID() → Class ID.

Returns

Class ID.

changed() → None

Call this after performing updates on the tree, to tell it that it’s been updated. For many operations this is called automatically, but you can call it manually for those cases where it isn’t.

clearAnimated()

Clear animation for channel ‘c’. Return True if successful.

clearFlag(f) → None.

Clear flag. :param f: Flag. :return: None.

critical(message) → None.

Parameters

message – message to put the knob in error, and do a popup.

Returns

None.

curveWidget

Curve Widget

debug(message) → None.

Parameters

message – message to put out to the error console, attached to the knob, if the verbosity level is set high enough.

Returns

None.

enabled() → Boolean.

Returns

True if the knob is enabled, False if it’s disabled.

error(message) → None.

Parameters

message – message to put the knob in error.

Returns

None.

fromScript()

Initialise from script.

fullyQualifiedName(channel=- 1) → string

Returns the fully-qualified name of the knob within the node. This can be useful for expression linking.

Parameters

channel – Optional parameter, specifies the channel number of the sub-knob (for example, channels of 0 and 1 would refer to the x and y of a XY_Knob respectively), leave blank or set to -1 to get the qualified name of the knob only.

Returns

The string of the qualified knob or sub-knob, which can be used directly in expression links.

getAuthorMode() → Integer.

Returns the authoring mode currently set on the knob. This is a unique string identifier of the option, which is also used for serialisation and deserialisation. It is not meant to change,thus one can rely on it. :return: The string identifier of the current authoring mode set.

getAuthorModes() → List.

Returns the names of the authoring modes of the knob if the knob is an authoring knob, otherwise an empty list. :return: The names of the authoring modes of the knob if the knob is an authoring knob, otherwise an empty list. This is a list of strings.

getDerivative()

Return derivative at time ‘t’ for channel ‘c’.

getFlag(f) → Bool.

Returns whether the input flag is set. :param f: Flag. :return: True if set, False otherwise.

getIntegral()

Return integral at the interval [t1, t2] for channel ‘c’.

getKeyIndex()

Return keyframe index at time ‘t’ for channel ‘c’.

getKeyList()

Get all unique keys on the knob. Returns list.

getKeyTime()

Return index of the keyframe at time ‘t’ for channel ‘c’.

getNthDerivative()

Return nth derivative at time ‘t’ for channel ‘c’.

getNumKeys()

Return number of keyframes for channel ‘c’.

getSelected() → [selectedObjects]

Returns list of all selected items in a curve knob As an example, say you have a Bezier curve selected,the following will return ‘Bezier1’ >>> curveKnob = nuke.toNode(‘RotoPaint1)[‘curves’] >>> selected = curveKnob.getSelected() >>> selected[0].name

getValue()

Return value at the current frame for channel ‘c’.

getValueAt()

Return value at time ‘t’ for channel ‘c’.

hasExpression(index=- 1) → bool

Return True if animation at index ‘index’ has an expression. :param index: Optional index parameter. Defaults to -1 if not specified. This can be specified as a keyword parameter if desired. :return: True if has expression, False otherwise.

isAnimated()

Return True if channel ‘c’ is animated.

isKey()

Return True if there is a keyframe at the current frame for channel ‘c’.

isKeyAt()

Return True if there is a keyframe at time ‘t’ for channel ‘c’.

label() → label.

Returns

label.

makeWidget() → PySide2.QtWidgets.QWidget.

Returns an instance of the QWidget subclass used to edit the knob’s value. The widget will update the knob’s value when its value changes and should update its displayed value(s) when they change on the knob. Can return null if no widget should be created for the knob. :return: PySide2.QtWidgets.QWidget.

name() → name.

Returns

name.

node() → nuke.Node

Return the node that this knob belongs to. If the node has been cloned, we’ll always return a reference to the original. :return: The node which owns this knob, or None if the knob has no owner yet.

removeKey()

Remove key for channel ‘c’. Return True if successful.

removeKeyAt()

Remove key at time ‘t’ for channel ‘c’. Return True if successful.

rootLayer

The root layer.

setAnimated()

Set channel ‘c’ to be animated.

setAuthorMode(authorMode) → None.

Sets the authoring mode on the knob. This accepts both the unique string identifier, which is also used for serialisation and deserialisation, or index of the option for convenience. These values are not meant to change, thus one can rely on them. :param authorMode: The string identifier or index of the authoring mode. :return: None.

setEnabled(enabled) → None.

Enable or disable the knob. :param enabled: True to enable the knob, False to disable it.

setExpression(expression, channel=- 1, view=None) → bool

Set the expression for a knob. You can optionally specify a channel to set the expression for.

Parameters

• expression – The new expression for the knob. This should be a string.

• channel – Optional parameter, specifying the channel to set the expression for. This should be an integer.

• view – Optional view parameter. Without, this command will set the expression for the current view theinterface is displaying. Can be the name of the view or the index.

Returns

True if successful, False if not.

setFlag(f) → None.

Logical OR of the argument and existing knob flags. :param f: Flag. :return: None.

setLabel(s) → None.

Parameters

s – New label.

Returns

None.

setName(s) → None.

Parameters

s – New name.

Returns

None.

setTooltip(s) → None.

Parameters

s – New tooltip.

Returns

None.

setValue(val, chan) → bool

Sets the value ‘val’ at channel ‘chan’. :return: True if successful, False if not.

setValueAt(val, time, chan) → bool

Sets the value ‘val’ at channel ‘chan’ for time ‘time’. :return: True if successful, False if not.

setVisible(visible) → None.

Show or hide the knob. :param visible: True to show the knob, False to hide it.

toElement(path) → Element

Takes a path which identifies a particular element in the curve tree and returns the corresponding Layer, Stroke or Shape object. The path is a slash separated string and is always resolved relative to the root layer. So if, for example, you have a RotoPaint node with a layer called ‘Layer1’ which contains a shape called ‘Shape1’, the path to the shape would be ‘Layer1/Shape1’. >>> knob = nuke.toNode(‘RotoPaint1)[‘curves’] >>> shape = knob.toElement(‘Layer1/Shape1’) >>> shape.name ‘Shape1’

toScript(quote, context=current) → string.

Return the value of the knob in script syntax. Pass True for quote to return results quoted in {}. Pass None for context to get results for all views and key times (as stored in a .nk file).

tooltip() → tooltip.

Returns

tooltip.

value()

Return value at the current frame for channel ‘c’.

visible() → Boolean.

Returns

True if the knob is visible, False if it’s hidden.

warning(message) → None.

Parameters

message – message to put a warning on the knob.

Returns

None.