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RE: Orientation event draft

From: Thomson, Martin <Martin.Thomson@andrew.com>
Date: Mon, 8 Mar 2010 06:57:20 +0800
To: Andrei Popescu <andreip@google.com>, public-geolocation <public-geolocation@w3.org>, Matt Womer <mdw@w3.org>
Message-ID: <8B0A9FCBB9832F43971E38010638454F03DF09802D@SISPE7MB1.commscope.com>

On my first read, I assumed that these events would be cumulative changes from the current orientation.  The angles are described in relation to the device axes (A, B, C), not the local reference frame (X, Y, Z), which doesn't help in making this any clearer.  There is no clear link between (A, B, C) and (X, Y, Z). 

Would I be right in assuming that 0, 0, 0 orientation equates to a device with the screen facing up and the top of the screen toward north?  That seems consistent with the example.

Could you also describe rotation a little more clearly.  Clockwise when viewed along an axis isn't sufficiently clear.  From the examples, I would assume that this is when values on the axis increase in the direction the viewer is facing.

I'd also point that the choice of rotation direction is a difficult one that needs more explanation.  Most people are accustomed to having East at 90 degrees (even if that is counter to mathematical convention.

Could a diagram (or diagrams) be added?


> -----Original Message-----
> From: public-geolocation-request@w3.org [mailto:public-geolocation-
> request@w3.org] On Behalf Of Andrei Popescu
> Sent: Saturday, 6 March 2010 6:32 AM
> To: public-geolocation; Matt Womer
> Subject: Orientation event draft
> Hello,
> I have uploaded the first editor's draft of the Orientation Events API:
> http://dev.w3.org/geo/api/spec-source-orientation.html

> I would be very grateful if you could review it and send comments.
> This also completes the following action item:
> http://www.w3.org/2008/geolocation/track/actions/53

> Matt, Steve Block has kindly volunteered to co-edit this spec with me.
> Would you be ok with that? If so, I would be grateful if you could
> help get him set up with CVS access, etc.
> Many thanks,
> Andrei

Received on Sunday, 7 March 2010 22:56:44 UTC

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