diff options
Diffstat (limited to 'core/java/android/hardware')
-rw-r--r-- | core/java/android/hardware/SensorEvent.java | 17 |
1 files changed, 17 insertions, 0 deletions
diff --git a/core/java/android/hardware/SensorEvent.java b/core/java/android/hardware/SensorEvent.java index a3ce9f5..b111b84 100644 --- a/core/java/android/hardware/SensorEvent.java +++ b/core/java/android/hardware/SensorEvent.java @@ -253,6 +253,23 @@ public class SensorEvent { * <p>Elements of the rotation vector are unitless. * The x,y, and z axis are defined in the same way as the acceleration * sensor.</p> + * The reference coordinate system is defined as a direct orthonormal basis, + * where: + * </p> + * + * <ul> + * <li>X is defined as the vector product <b>Y.Z</b> (It is tangential to + * the ground at the device's current location and roughly points East).</li> + * <li>Y is tangential to the ground at the device's current location and + * points towards the magnetic North Pole.</li> + * <li>Z points towards the sky and is perpendicular to the ground.</li> + * </ul> + * + * <p> + * <center><img src="../../../images/axis_globe.png" + * alt="World coordinate-system diagram." border="0" /></center> + * </p> + * * <ul> * <p> * values[0]: x*sin(θ/2) |