The ratio of width to use when determining font scale. Will be used if smaller than verticalScaleRatio. Default value is 0.5.
rotation
rotation:number
Brief
Rotation angle for the labels.
The angle is computed clockwise from the track central line.
(i.e. The vertical line if the track is vertical and
the horizontal line if the track is horizontal.)
verticalScaleRatio
verticalScaleRatio:number
The ratio of height to use when determining font scale. Will be used if smaller than horizontalScaleRatio. Default value is 0.1.
The ratio of width to use when determining font scale. Will be used if smaller than verticalScaleRatio. Default value is 0.5.