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Re: SVG 1.2 - SvgWindow And SvgDocument

From: Don XML <don_xml@hotmail.com>
Date: Wed, 11 Dec 2002 14:34:53 -0500
To: www-svg@w3.org
Message-ID: <F360T9b22lxJQ7Lsgd40000400e@hotmail.com>

Jim,

I'm having a hard time understanding your following statement.  Can you 
clarify it:

<Jim>
I have a problem with this view, I would say, that with SVG within
another document, the SvgWindow doesn't exist, what would innerHeight and 
innerWidth be in this situation (we don't even know the viewport would be 
rectangular for example, let alone its size)?  The defaultStyleSheet 
attribute is also presumably intended to overcome problems the problems with 
not knowing what that stylesheet is, but that doesn't help in a mixed 
namespace document since you don't know what other CSS rules are coming down 
from the other namespace.  I think having svgWindow outside of viewers of 
SVG Documents is too problematic.
</Jim>

If the SvgWindow doesn't exist, and the SvgDocument doesn't exist (since the 
SVG element isn't the root element the 1.1 spec says a SvgDocument can't 
exist) how do your create a SvgElement?  What is the root object that can 
create SVG objects?  That's what lead me to a DocFragment approach.  I also 
agree that the SvgWindow doesn't make total sense outside of viewer 
applications, but without it some SVG DOM methods can not return values in 
some situations.

Take the following example:

<?xml version="1.0" standalone="yes"?>
<parent xmlns="http://example.org"
       xmlns:svg="http://www.w3.org/2000/svg">
   <!-- parent contents here -->
   <svg:svg width="100%" height="100%" version="1.1">
      <svg:ellipse cx="2cm" cy="4cm" rx="2cm" ry="1cm" />
   </svg:svg>
   <!-- ... -->
</parent>

What is the width and height of the SVG?  It's 100% of the parent element, 
but what's the height and width of the parent element?  In section 7.2 it is 
described as:

In the following example, an SVG graphic is embedded inline within a parent 
XML document which is formatted using CSS layout rules. Since CSS 
positioning properties are not provided on the outermost 'svg' element, the 
width="100px" and height="200px" attributes determine the size of the 
initial viewport.

But in my example I changed the height and width of the parent element, so 
you need some way of letting informing the SVG fragment the size of the 
parent element, otherwise you can not create an initial viewport.


Don XML

Always listen to experts. They'll tell you what can't be done, and why. Then 
do it.


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Received on Wednesday, 11 December 2002 14:41:00 GMT

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