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Re: Transformed Pointer Coordinates?

From: Rik Cabanier <cabanier@gmail.com>
Date: Wed, 1 May 2013 23:39:38 -0700
Message-ID: <CAGN7qDA62qjhKo+-1YLmk0cNnyfouuXOcpRCv=n2ZrPLGZ8skg@mail.gmail.com>
To: Jet Villegas W3C <w3c@junglecode.net>
Cc: Doug Schepers <schepers@w3.org>, public-pointer-events@w3.org, public-fx@w3.org, www-style@w3.org
Those floats should be unrestricted though since they could become NaN in
certain circumstances.

On Wed, May 1, 2013 at 10:11 PM, Jet Villegas W3C <w3c@junglecode.net>wrote:

> I've started hacking this up for Gecko[1]. The DOMPoint IDL source
> currently looks like this:
>
> [Constructor(optional float x = 0, optional float y = 0),Pref="layout.css.dompoint.enabled"]
> dictionary DOMPoint {
>   float x = 0;
>   float y = 0;
> };
>
> I'd like to ratify the IDL in the appropriate spec before moving on to the
> coord-space-conversion methods. Do we have consensus?
>
> [1] https://bugzilla.mozilla.org/show_bug.cgi?id=850805
>
> --Jet
>
>
> On Tue, Jan 29, 2013 at 9:28 AM, Doug Schepers <schepers@w3.org> wrote:
>
>> Hi, folks-
>>
>> When elements are transformed (shifted X/y through translate, larger or
>> smaller through scale, etc.) using CSS transforms or SVG, dealing with
>> pointer events becomes more complicated and unintuitive... things just
>> aren't where they appear to be.
>>
>> This leads to all sorts of confusion for authors in positioning things...
>> dragging, repositioning, or creating elements based on pointer position.
>> (To a lesser extent, this is a general problem with positioning relative to
>> transformed elements, but nesting context takes care of most
>> non-pointer-position cases.)
>>
>> Jonathan Watt (Mozilla) has a handy script library [1] that helps authors
>> solve this in SVG, but unless someone knows about that script, it is
>> frustrating. I think this should be solved in a spec, perhaps as a method
>> to get the relative transformed coordinates in the appropriate coordinate
>> space.
>>
>> I started to address this in DOM3 Events [2][3], but we decided to defer
>> it, or to address it in CSSOM or the CSS Transforms spec.
>>
>> I'm raising this here to ask where it is most appropriate to address
>> this: the Pointer Events v2 spec (still in the future), the CSS Transforms
>> spec, or the CSSOM spec?
>>
>> [1] http://jwatt.org/svg/tmp/**mouse-relative-positioning.svg<http://jwatt.org/svg/tmp/mouse-relative-positioning.svg>
>> [2] http://www.w3.org/2009/09/16-**webapps-minutes.html#item09<http://www.w3.org/2009/09/16-webapps-minutes.html#item09>
>> [3] http://www.w3.org/2010/10/13-**webapps-minutes.html#item01<http://www.w3.org/2010/10/13-webapps-minutes.html#item01>
>>
>> Regards-
>> -Doug
>>
>>
>
Received on Thursday, 2 May 2013 06:41:32 UTC

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