QuickTime 4 Reference

Single Tweens and Tween Sequences

A tween operation can include one or more tweens. A tween operation that includes just one tween is called a single tween . For a single tween, results for any time points in the tween duration are derived from that tween. A tween sequence contains more than one tween of the same type. To specify when each tween is used, you specify an ending percentage for each tween. For example, if you have a tween sequence containing three tweens and want to use the first tween for the first quarter of the tween duration, the second tween for the second quarter of the tween duration, and the third tween for the remainder of the tween duration, you set the end percentage for the first tween to .25 , for the second to .5 , and for the third to 1.0 . The first tween in the sequence always begins at the beginning, and each subsequent tween begins after the end percentage of the tween before it.