Internal method that handles repeating or yoyo'ing this TweenData.
Called automatically by setStateFromStart and setStateFromEnd.
| name | type | description |
|---|---|---|
| diff | number |
Any extra time that needs to be accounted for in the elapsed and progress values. |
| setStart | boolean |
Set the TweenData start values? |
| isYoyo | boolean |
Is this call a Yoyo check? |