Axis constant: TouchMajor axis of a motion event.

• For a touch screen, reports the length of the major axis of an ellipse that represents the touch area at the point of contact. The units are display pixels.
• For a touch pad, reports the length of the major axis of an ellipse that represents the touch area at the point of contact. The units are device-dependent; use InputDevice.GetMotionRange(Axis) to query the effective range of values.