Axis constant: ToolMajor axis of a motion event.

• For a touch screen, reports the length of the major axis of an ellipse that represents the size of the approaching finger or tool used to make contact.
• For a touch pad, reports the length of the major axis of an ellipse that represents the size of the approaching finger or tool used to make contact. The units are device-dependent; use InputDevice.GetMotionRange(Axis) to query the effective range of values.

When the touch is circular, the major and minor axis lengths will be equal to one another.

The tool size may be larger than the touch size since the tool may not be fully in contact with the touch sensor.