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Editorial: small fixup to Device Motion section #163

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merged 5 commits into from
May 8, 2024
Merged

Editorial: small fixup to Device Motion section #163

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2bc2dca
Editorials: small fixup to Device Motion section
marcoscaceres May 2, 2024
53b051e
Add back PROPERACCELERATION
marcoscaceres May 7, 2024
a44261c
Update index.bs
marcoscaceres May 7, 2024
1f6f277
Update index.bs
marcoscaceres May 7, 2024
dba5559
Merge branch 'main' into Device-Motion
marcoscaceres May 7, 2024
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4 changes: 2 additions & 2 deletions index.bs
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Expand Up @@ -195,7 +195,7 @@ Note: This choice of angles follows mathematical convention, but means that alph

A device's orientation is always relative to another coordinate system, whose choice influences the kind of information that the orientation conveys as well as the source of the orientation data.

<dfn>Relative orientation</dfn> is measured with an accelerometer and a gyroscope, and the reference coordinate system is arbitrary. Consequently, the orientation data provides information about changes relative to the initial position of the device.
<dfn local-lt="relative orientation">Relative device orientation</dfn> is measured with an accelerometer and a gyroscope, and the reference coordinate system is arbitrary. Consequently, the orientation data provides information about changes relative to the initial position of the device.

Note: In native platform terms, this is similar to a relative <a href="https://learn.microsoft.com/en-us/uwp/api/windows.devices.sensors.sensorreadingtype#remarks">OrientationSensor</a> on Windows, a <a href="https://developer.android.com/reference/android/hardware/Sensor#TYPE_GAME_ROTATION_VECTOR">game rotation vector sensor</a> on Android, or the <a href="https://developer.apple.com/documentation/coremotion/cmattitudereferenceframe/1615953-xarbitraryzvertical">xArbitraryZVertical</a> option for Core Motion.

Expand All @@ -210,7 +210,7 @@ This specification expresses a device's motion in space by measuring its acceler

Acceleration is the rate of change of velocity of a device with respect to time. Is is expressed in meters per second squared (m/s<sup>2</sup>).

<dfn>Linear acceleration</dfn> represents the device's acceleration rate without the contribution of the gravity force. When the device is laying flat on a table, its <a>linear acceleration</a> is 0 m/s<sup>2</sup>.
<dfn local-lt="linear acceleration">Linear device acceleration</dfn> represents the device's acceleration rate without the contribution of the gravity force. When the device is laying flat on a table, its <a>linear acceleration</a> is 0 m/s<sup>2</sup>.

When the acceleration <dfn lt="acceleration with gravity">includes gravity</dfn>, its value includes the effect of gravity and represents proper acceleration ([[PROPERACCELERATION]]). When the device is in free-fall, the acceleration is 0 m/s<sup>2</sup>. This is less useful in many applications but is provided as a means of providing best-effort support by implementations that are unable to provide <a>linear acceleration</a> (due, for example, to the lack of a gyroscope).

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