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Re: Fwd: getBBox() on a <use>

From: Jeff Schiller <codedread@gmail.com>
Date: Fri, 29 Jan 2010 09:30:36 -0600
Message-ID: <da131fde1001290730x9ee01bcvd37ffa3d5cecfcf2@mail.gmail.com>
To: Francis Hemsher <fhemsher@gmail.com>
Cc: Patrick Dengler <patd@microsoft.com>, www-svg <www-svg@w3.org>
Hi Francis,

Actually you remind me to bring up a point here:

In the SVG 1.1 spec [1], it shows the properties of SVGRect
(x,y,width,height) and SVGMatrix (a,b,c,d,e,f) with the comment

    // raises DOMException on setting

However, I've never seen this in practice (and actually SVG-edit
really depends on the values of SVGMatrix being editable in some

Is this corrected in SVG 1.1 2ed?  Can someone give insight into this?


[1] http://www.w3.org/TR/SVG11/idl.html

On Fri, Jan 29, 2010 at 9:23 AM, Francis Hemsher <fhemsher@gmail.com> wrote:
> Hi Patrick,
> I've never had a need to consider changing the bounding box values.
> I always assumed it was read-only.
> Regards,
> Francis
> On 1/29/10, Patrick Dengler <patd@microsoft.com> wrote:
>> Sorry to be the late to the game on this one, I thought I would add more
>> confusion or perhaps ask an already answered question :)
>> Should SVGLocatable.getBBox return a read-only SVGRect?
>> You obviously cannot modify the bounding box of an element by modifying the
>> rectangle. Making it readonly would allow implementations to store a cached
>> result without fear of the value being changed by callers.
>> Thanks in advance,
>> Patrick Dengle
>> -----Original Message-----
>> From: www-svg-request@w3.org [mailto:www-svg-request@w3.org] On Behalf Of
>> Boris Zbarsky
>> Sent: Wednesday, January 20, 2010 12:53 PM
>> To: Jeff Schiller
>> Cc: www-svg
>> Subject: Re: Fwd: getBBox() on a <use>
>> On 1/20/10 3:47 PM, Jeff Schiller wrote:
>>> The confusing part is that<g>  does not have x,y,width,height
>>> attributes, while<use>  does, implying that the<use>  imposes a given
>>> box in the user coordinate system beyond just its referenced/shadowed
>>> content.
>> Yep.
>>> I realize that it's too late to change things in SVG 1.1 and SVGT 1.2,
>>> but I'm curious why would it be useful for getBBox() on a<use>
>>> element to return the bounding box of the referenced content and not
>>> take into account the position/scaling imposed by the surrounding use
>>> element's x,y,width,height?
>> I have no idea, honestly.  But then again, the behavior of getBBox()
>> generally seems to be ... somewhat odd (given the user coordinate system
>> thing).
>>> For instance, I could have six<use>  elements all pointing to the same
>>> element - yet all six<use>  bboxes would be identical.
>> I'm not sure they necessarily would if the element used percent sizes,
>> would they?
>> -Boris
Received on Friday, 29 January 2010 15:31:11 UTC

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