compensation property
A List<double> ordered [x,y] that corresponds to an amount
that gets shaved from each raw AccelerometerEvent, sampled at
samplingRate, to compensate for a device being held in a "standard"
position for some time.
If Reset.shouldReset is true,
this compensation is applied in addition.
This "compensated" sensor data may differ from, say, raw y output
which is 0 only when the device is flat on its back on a surface.
The default is [0, 0] which corresponds to no compensation
for the X-axis nor Y-axis readings.
Compensation.none applies a const [0,0] compensation.
An initialization around Compensation.mobilePortraitMostlyUpright
([0, 8.5]) roughly correlates to a mobile phone that is held upright,
portrait mode toward a user's face.
Implementation
final List<double> compensation;