DeviceMotionEvent: rotationRate property
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The rotationRate read-only property of the DeviceMotionEvent interface returns the rate at which the device is rotating around each of its axes in degrees per
second.
Note:
If the hardware isn't capable of providing this
information, this property returns null.
Value
The rotationRate property is a read only object describing the rotation
rates of the device around each of its axes:
alpha-
The rate at which the device is rotating about its Z axis; that is, being twisted about a line perpendicular to the screen.
beta-
The rate at which the device is rotating about its X axis; that is, front to back.
gamma-
The rate at which the device is rotating about its Y axis; that is, side to side.