The orientation of the touching ellipse. The value should describe a signed
quarter of a revolution clockwise around the touch center. The signed value
range is arbitrary, but zero should be returned for an ellipse aligned with
- the Y axis of the surface, a negative value when the ellipse is turned to
- the left, and a positive value when the ellipse is turned to the
- right. When completely aligned with the X axis, the range max should be
- returned.
+ the Y axis (north) of the surface, a negative value when the ellipse is
+ turned to the left, and a positive value when the ellipse is turned to the
+ right. When aligned with the X axis in the positive direction, the range
+ max should be returned; when aligned with the X axis in the negative
+ direction, the range -max should be returned.
Touch ellipsis are symmetrical by default. For devices capable of true 360
degree orientation, the reported orientation must exceed the range max to