MItCurveCV Class Reference
[OpenMaya - API module for common classes]

#include <MItCurveCV.h>

List of all members.

---

Detailed Description

Iterator for NURBS curve CVs.

This class is the iterator class for NURBS curve control vertices (CVs). The iteration can be for a given curve or for a group of CVs.

Example: Translates the CVs for a curve in the X direction (world space).

    MItCurveCV* cvIter = new MItCurveCV( curve, &stat );
    MVector vector(1.0,0.0,0.0);

    if ( MStatus::kSuccess == stat ) {
        for ( ; !cvIter->isDone(); cvIter->next() )
        {
            cvIter->translateBy( vector, MSpace::kWorld );
        }
        cvIter->updateCurve();  // Tell curve is has been changed
    }
    else {
        cerr << "Error creating iterator!" << endl;
    }

Examples:

cvPosCmd.cpp, lassoTool.cpp, moveCurveCVsCmd.cpp, moveTool.cpp, and translateCmd.cpp.

Public Member Functions
	MItCurveCV (MObject &curve, MStatus *ReturnStatus=NULL)
	MItCurveCV (const MDagPath &curve, MObject &component=MObject::kNullObj, MStatus *ReturnStatus=NULL)
virtual	~MItCurveCV ()
bool	isDone (MStatus *ReturnStatus=NULL) const
MStatus	next ()
MStatus	reset ()
MStatus	reset (MObject &curve)
MStatus	reset (const MDagPath &curve, MObject &component=MObject::kNullObj)
MPoint	position (MSpace::Space space=MSpace::kObject, MStatus *ReturnStatus=NULL) const
MStatus	setPosition (const MPoint &pt, MSpace::Space space=MSpace::kObject)
MStatus	translateBy (const MVector &vec, MSpace::Space space=MSpace::kObject)
int	index (MStatus *ReturnStatus=NULL) const
MObject	cv (MStatus *ReturnStatus=NULL) const
	This method is obsolete.
MObject	currentItem (MStatus *ReturnStatus=NULL) const
bool	hasHistoryOnCreate (MStatus *ReturnStatus=NULL) const
MStatus	updateCurve ()

---

Constructor & Destructor Documentation

MItCurveCV::MItCurveCV	(	MObject &	curve,
		MStatus *	ReturnStatus = NULL
	)

Constructor. This constructor is used when iterating over an entire curve.

Parameters:

[in]	curve	The curve for the iteration
[out]	ReturnStatus	Status code

Status Codes:

• MS::kSuccess The iterator was constructed.
• MS::kInsufficientMemory No memory available.
• MS::kInvalidParameter An invalid object was given.
• MS::kFailure An object error has occurred.

MItCurveCV::MItCurveCV	(	const MDagPath &	curve,
		MObject &	component = MObject::kNullObj,
		MStatus *	ReturnStatus = NULL
	)

Constructor. This constructor is used when iterating over a group of CVs. If the component is not given then the iteration will be for the whole curve.

Parameters:

[in]	curve	Dag path to the curve for the iteration
[in]	component	A group of CVs to be iterated on
[out]	ReturnStatus	Status code

Status Codes:

• MS::kSuccess The iterator was constructed.
• MS::kInsufficientMemory No memory available.
• MS::kInvalidParameter An invalid object was given.
• MS::kFailure An object error has occurred.

MItCurveCV::~MItCurveCV

(

)

[virtual]

Class destructor. Deallocates memory used by this iterator.

---

Member Function Documentation

bool MItCurveCV::isDone

(

MStatus *

ReturnStatus = NULL

)

const

Returns true if the iteration is finished, i.e. there are no more CVs to iterate on.

Parameters:

[out]

ReturnStatus

Status code

Returns:

Boolean value: true if there are no more CVs to iterate on, false otherwise.

Status Codes:

• MS::kSuccess The method was successful.
• MS::kFailure An object error has occurred.

MStatus MItCurveCV::next

(

)

Advance to the next CV in the iteration. If the iterator is already at the last CV then this method has no effect. Use isDone to determine if the iterator is at the last CV.

Returns:

Status code

Status Codes:

• MS::kSuccess The method was successful.
• MS::kFailure An object error has occurred.

MStatus MItCurveCV::reset

(

)

Reset the iterator to the first CV.

Returns:

Status code

Status Codes:

• MS::kSuccess The iterator was reset.
• MS::kFailure An object error has occurred.

MStatus MItCurveCV::reset

(

MObject &

curve

)

Reset the iterator to the specified curve.

Parameters:

[in]

curve

The curve for the iteration

Returns:

Status code

Status Codes:

• MS::kSuccess The iterator was reset.
• MS::kInsufficientMemory No memory available.
• MS::kInvalidParameter An invalid object was given.
• MS::kFailure An object error has occurred.

MStatus MItCurveCV::reset	(	const MDagPath &	curve,
		MObject &	component = MObject::kNullObj
	)

Reset the iterator to the specified curve and component. The component is a group of CVs belonging to the specified curve. The component defaults to MObject::kNullObj. If a component is not given then the iterator will be reset for the whole curve.

Parameters:

[in]	curve	Dag path to the curve for the iteration
[in]	component	A group of CVs to be iterated on

Returns:

Status code

Status Codes:

• MS::kSuccess The iterator was reset.
• MS::kInsufficientMemory No memory available.
• MS::kInvalidParameter An invalid object was given.
• MS::kFailure An object error has occurred.

MPoint MItCurveCV::position	(	MSpace::Space	space = MSpace::kObject,
		MStatus *	ReturnStatus = NULL
	)			const

Return the position of the current CV.

Parameters:

[in]	space	the co-oordinate system for the returned point
[out]	ReturnStatus	Status code

Returns:

Status code

Status Codes:

• MS::kSuccess The position of the current CV was returned.
• MS::kInvalidParameter Invalid space parameter..
• MS::kFailure An Object error has occurred.

MStatus MItCurveCV::setPosition	(	const MPoint &	pt,
		MSpace::Space	space = MSpace::kObject
	)

Set the position of the current CV to the specified point.

Parameters:

[in]

space

the co-ordinate system for this transformation.

Returns:

Status code

Status Codes:

• MS::kSuccess The transformation was successful.
• MS::kInvalidParameter Invalid space for this transformation.
• MS::kFailure An Object error has occurred.

MStatus MItCurveCV::translateBy	(	const MVector &	vec,
		MSpace::Space	space = MSpace::kObject
	)

Translates the current CV by the amount sepcified in vec.

Parameters:

[in]

space

the co-oordinate system for this transformation.

Returns:

Status code

Status Codes:

• MS::kSuccess The transformation was successful.
• MS::kInvalidParameter Invalid space for this transformation.
• MS::kFailure An Object error has occurred.

int MItCurveCV::index

(

MStatus *

ReturnStatus = NULL

)

const

This method returns the index of the current CV in the CV array for this curve.

Parameters:

[out]

ReturnStatus

Status code

Returns:

The index of the current CV

Status Codes:

• MS::kSuccess The method was successful
• MS::kFailure An object error has occurred

MObject MItCurveCV::cv

(

MStatus *

ReturnStatus = NULL

)

const

This method is obsolete.

Deprecated:

Use the MItCurveCV::currentItem method.

This method returns the current CV as an MObject.

Parameters:

[out]

ReturnStatus

Status code

Returns:

A handle to the CV requested

Status Codes:

• MS::kSuccess The method was successful
• MS::kInsufficientMemory No memory available.
• MS::kFailure An object error has occurred

MObject MItCurveCV::currentItem

(

MStatus *

ReturnStatus = NULL

)

const

This method returns the current CV as an MObject.

Parameters:

[out]

ReturnStatus

Status code

Returns:

A handle to the CV requested

Status Codes:

• MS::kSuccess The method was successful
• MS::kInsufficientMemory No memory available.
• MS::kFailure An object error has occurred

bool MItCurveCV::hasHistoryOnCreate

(

MStatus *

ReturnStatus = NULL

)

const

This method determines if the shape was created with history.

If the object that this iterator is attached to is not a shape then this method will fail.

Parameters:

[out]

ReturnStatus

Returns:

Boolean value: true if shape has history, false otherwise.

Status Codes:

• MS::kSuccess The method was successful.
• MS::kFailure An object error has occurred.

MStatus MItCurveCV::updateCurve

(

)

This method is used to signal the curve that it has been changed and needs to redraw itself.

When modifying a large number of CVs, it is most efficient to call this method after all of the CVs have been modified.

• Status code

Status Codes:

• MS::kSuccess Method was successful.
• MS::kFailure An Object error has occurred.