QuickTime 4 Reference

Using a `kTweenTypePathToMatrixTranslationAndRotation` Tween Component

To use a kTweenTypePathToMatrixTranslationAndRotation tween component, do the following:

Create a QT atom container.
Insert a kTweenEntry atom into the QT atom container for the tween.
Insert a kTweenType atom that specifies the tween type into the kTweenEntry atom.
Insert a kTweenData atom into the kTweenEntry atom.
Perform the tweening operation, using QTDoTween .

Listing 16 shows how to create a kTweenTypePathToMatrixTranslationAndRotation tween.

Listing 16 Creating a kTweenTypePathToMatrixTranslationAndRotation tween container



 
err = CreateSamplePathTweenContainer( container,

                            kTweenTypePathToMatrixTranslationAndRotation,

                            1, false, duration, X2Fix(0.5), &tweenAtom );

if ( err ) goto bail;



err = QTNewTween( &tween, container, tweenAtom, duration );

if ( err ) goto bail;



for ( tweenTime = 0; tweenTime <= duration; tweenTime++ ) {

    MatrixRecord absoluteMatrix;

    

    err = QTDoTween( tween, tweenTime, result, nil, nil, nil );

    if ( err ) goto bail;

    

    absoluteMatrix = *(MatrixRecord *)*result;

}

    

err = QTDisposeTween( tween );



bail:

    if ( container ) QTDisposeAtomContainer( container );

    if ( result ) DisposeHandle( result );

Using a kTweenTypePathToMatrixTranslationAndRotation Tween Component

Using a `kTweenTypePathToMatrixTranslationAndRotation` Tween Component