line
The cues anchor positioned by line. One of AnchorType.AnchorTypeStart, AnchorType.AnchorTypeMiddle, AnchorType.AnchorTypeEnd and AnchorType.TypeUnset.
For the normal case of horizontal text, AnchorType.AnchorTypeStart, AnchorType.AnchorTypeMiddle and AnchorType.AnchorTypeEnd correspond to the top, middle and bottom of the cue box respectively.