Get the current length of the minor axis of an ellipse that describes the size
of the approaching tool for the given pointer index.
The tool area represents the estimated size of the finger or pen that is
touching the device independent of its actual touch area at the point of contact.
Get the current length of the minor axis of an ellipse that describes the size of the approaching tool for the given pointer index. The tool area represents the estimated size of the finger or pen that is touching the device independent of its actual touch area at the point of contact.