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Bug 3427 - Android accelerometer z-axis incorrect
Summary: Android accelerometer z-axis incorrect
Status: RESOLVED FIXED
Alias: None
Product: SDL
Classification: Unclassified
Component: joystick (show other bugs)
Version: HG 2.0
Hardware: All Android (All)
: P2 normal
Assignee: Sam Lantinga
QA Contact: Sam Lantinga
URL:
Keywords:
Depends on:
Blocks:
 
Reported: 2016-09-17 01:06 UTC by Alex Szpakowski
Modified: 2016-09-30 00:16 UTC (History)
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Description Alex Szpakowski 2016-09-17 01:06:33 UTC 
As seen here https://bitbucket.org/rude/love/issues/1202/accelerometer-z-axis , the Java code for sending accelerometer data to SDL's C code has an incorrect Z-axis calculation.
Comment 1 Sam Lantinga 2016-09-29 23:40:55 UTC 
Fixed, thanks!
https://hg.libsdl.org/SDL/rev/c9e2cb97c17d
Comment 2 Sam Lantinga 2016-09-29 23:41:29 UTC 
Actually, Alex, can you confirm that with that change iOS and Android match for the same phone orientation?
Comment 3 Alex Szpakowski 2016-09-30 00:16:18 UTC 
I don't have an Android device (or any Android development tools set up right now), so I can only test iOS. Some observations:

- with my phone lying flat on a table and the screen facing up, acceleration due to gravity is -Z. It's +Z when the screen is facing down and lying flat.

- holding it vertically in portrait, gravity is +Y. It's -Y when held upside down that way.

- holding it vertically in landscape (with the top of the phone pointing to the right), gravity is +X. Pointing to the left it's -X.

- the window's orientation doesn't affect the gravity values, only the device orientation does.