MFnKeyframeDeltaTangent Class Reference

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Detailed Description

Function set for changes to a key's tangent.

A MFnKeyframeDeltaTangent function allows API programmers to read changes in keyframe tangent values. It captures changes in tangent type, as well as, changes in tangent time/value pair.

MFnKeyframeDeltaTangents are generated by a MAnimMessage::addAnimKeyframeEditedCallback. Because a key's tangent may be unbroken. It is possible to receive to MFnKeyframeDeltaTangent values per key -- one for the incoming tangent and one for the outgoing tangent. The API programmer should use the isInTangent method to determine if the tangent change affects the in-bound tangent or out-bound tangent.

#include <MFnKeyframeDeltaTangent.h>

Inheritance diagram for MFnKeyframeDeltaTangent:

List of all members.

Public Member Functions
virtual MFn::Type	type () const
	Function set type.
virtual	~MFnKeyframeDeltaTangent ()
	Destructor.
	MFnKeyframeDeltaTangent ()
	Default constructor.
	MFnKeyframeDeltaTangent (MObject &object, MStatus *ReturnStatus=NULL)
	Constructor.
MFnAnimCurve::TangentType	previousTangentType (MStatus *ReturnStatus=NULL) const
	Returns the previous tangent type.
MFnAnimCurve::TangentType	currentTangentType (MStatus *ReturnStatus=NULL) const
	Returns the current tangent type that the key represents.
MStatus	getPreviousPosition (float &x, float &y) const
	Get the values of the previous time/value position of the tangent for this key.
MStatus	getCurrentPosition (float &x, float &y) const
	Get the values of the current time/value position of the tangent for this key.
bool	isInTangent (MStatus *ReturnStatus=NULL) const
	Key's have two tangents, in-bound and out-bound.
	MFnKeyframeDeltaTangent (const MObject &object, MStatus *ReturnStatus=NULL)
	Constructor.
Protected Member Functions
virtual const char *	className () const
	Class name.

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Constructor & Destructor Documentation

MFnKeyframeDeltaTangent	(	MObject &	object,
		MStatus *	ReturnStatus = NULL
	)

Constructor.

Class constructor that initializes the function set to the given MObject.

Parameters:

[in]	object	The MObject to attach the function set to
[out]	ReturnStatus	the return status

Status Codes:

• MS::kSuccess if the function set is successfully attached
• MS::kInvalidParameter if the MObject does not represent a valid Maya object or if the function set is not allowed to attach to this MObject

MFnKeyframeDeltaTangent	(	const MObject &	object,
		MStatus *	ReturnStatus = NULL
	)

Constructor.

Class constructor that initializes the function set to the given MObject.

Parameters:

[in]	object	The MObject to attach the function set to
[out]	ReturnStatus	the return status

Status Codes:

• MS::kSuccess if the function set is successfully attached
• MS::kInvalidParameter if the MObject does not represent a valid Maya object or if the function set is not allowed to attach to this MObject

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Member Function Documentation

MFn::Type type

(

)

const [virtual]

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Function set type.

Return the class type : MFn::kKeyframeDeltaTangent.

Reimplemented from MFnKeyframeDelta.

const char * className

(

)

const [protected, virtual]

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Class name.

Return the class name : "MFnKeyframeDeltaTangent".

Reimplemented from MFnKeyframeDelta.

MFnAnimCurve::TangentType previousTangentType

(

MStatus *

ReturnStatus = NULL

)

const

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Returns the previous tangent type.

Parameters:

[out]

ReturnStatus

Return code.

Returns:

The previous tangent type.

Status Codes:

• MS::kSuccess The operation succeeded.
• MS::kFailure An object error has occurred.

MFnAnimCurve::TangentType currentTangentType

(

MStatus *

ReturnStatus = NULL

)

const

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Returns the current tangent type that the key represents.

Parameters:

[out]

ReturnStatus

Return code.

Returns:

The current tangent type.

Status Codes:

• MS::kSuccess The operation succeeded.
• MS::kFailure An object error has occurred.

MStatus getPreviousPosition	(	float &	x,
		float &	y
	)		const

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Get the values of the previous time/value position of the tangent for this key.

Parameters:

[out]	x	The x component of the position.
[out]	y	The y component of the position.

Returns:

MStatus based on the success or failure of the method.

Status Codes:

• MS::kSuccess The operation succeeded.
• MS::kFailure An object error has occurred.

MStatus getCurrentPosition	(	float &	x,
		float &	y
	)		const

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Get the values of the current time/value position of the tangent for this key.

Parameters:

[out]	x	The x component of the position.
[out]	y	The y component of the position.

Returns:

A MStatus based on the success or failure of the method.

Status Codes:

• MS::kSuccess The operation succeeded.
• MS::kFailure An object error has occurred.

bool isInTangent

(

MStatus *

ReturnStatus = NULL

)

const

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Key's have two tangents, in-bound and out-bound.

A MFnKeyframeTangent object can created once for each tangent. Use this method to determine which tangent was modified.

Parameters:

[out]

ReturnStatus

Return code.

Returns:

• true if the incoming tangent was modified.
• false if the outgoing tangent was modified.

Status Codes:

• MS::kSuccess The operation succeeded.
• MS::kFailure An object error has occurred.