[tei-council] links into images

[Conal Tuohy]

I have taken Sebastian's encoding of the example and modified the svg to use the svg:view element in place of svg:rect. 

Like a rect, a view element also defines a rectangle (it has a viewBox attribute containing the x, y, width and height of the view's bounding box). However, a view is probably a more appropriate type of SVG element to link to. To quote from the SVG spec:
 
 Because SVG content often represents a picture or drawing of something, 
 a common need is to link into a particular view of the document, where 
 a view indicates the initial transformations so as to present a closeup 
 of a particular section of the document.

   http://www.w3.org/TR/SVG/linking.html#LinksIntoSVG

Navigating to a view element within an svg is supposed to zoom in on the region defined in that view. In a real application it might be preferable to highlight the region defined by the view using a coloured rectangle, but equally some other rendering might be chosen; this is better not encoded in the TEI and left up to the rendering application or user agent I think (it's a trivial transformation anyway).

Cheers

Con


<!--
<?xml version="1.0" standalone="no"?>
<!DOCTYPE svg PUBLIC "-//W3C//DTD SVG 1.1//EN" "http://www.w3.org/Graphics/SVG/1.1/DTD/svg11.dtd">
-->
<svg xmlns="http://www.w3.org/2000/svg"
	xmlns:xlink="http://www.w3.org/1999/xlink">
	<image
		xlink:href="../Source/Images/compic.png"
		width="597"
		height="897"
		id="image1764" />	
	<view id="p-l9801" viewBox="57 467.85216 169 53.5"/>
	<view id="p-l9802" viewBox="312 474.36218 126 47"/>
	<view id="p-l9806" viewBox="313 601.36218 158.5 32.5"/>
	<view id="p-e9806" viewBox="56.5 591.36218 233 25.5"/>
	<view id="p-l9807" viewBox="312 635.86218 130 25.5"/>
	<view id="p-e9807" viewBox="55 618.86218 188 22.5"/>
</svg>

PS I was a bit disappointed that firefox didn't zoom to show a view when I opened the above file with a fragment id, like "example.svg#p-l9801".


-----Original Message-----
From: tei-council-bounces at lists.village.Virginia.EDU on behalf of Lou Burnard
Sent: Tue 10/10/06 21:27
To: Christian Wittern
Cc: TEI Council; Syd_Bauman at Brown.edu
Subject: Re: [tei-council] links into images
 
Is anyone going to answer my question?

Here it is again: How do I do that in SVG (or anything else they'd care 
to recommend)

I'd like to edit the text of this chapter to demonstrate how this 
example works in whatever or whatevers. I don't like leaving an example 
which recommends something we know is broken.


Christian Wittern wrote:
> Syd Bauman <Syd_Bauman at Brown.edu> writes:
>
>   
>> [Comenius example at
>> http://www.tei-c.org/release/doc/tei-p5-doc/html/SA.html#SACSXA.] 
>>
>>     
>>> I'm guessing that I can do this in SVG. So how do I revise the
>>> example in this chapter to do that?
>>>       
>> Yes, the intent has always been to change those comments of vestigal
>> extended pointer syntax into SVG. At the time, I did not know enough
>> SVG to do that myself, although with some effort I could probably do
>> it now.
>>     
>
> The proposal from Dot and Conal propose to do this differently -- they
> initially suggested mp(), but then discovered that this does not work
> for bitmapped images and are now suggesting a home-baked syntax.
>
> Well, hesitatingly, I admit that this is one of the cases where we
> should propably recommend SVG -- although I seem to remember that METS
> can do similar things, which might be more attractive for (digital) libraries
> who are committed to METS anyway.
>
> best, chw
>
>   

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