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Re: patternTransform -- and toroidal wraps

From: Ken Stacey <ken@svgmaker.com>
Date: Wed, 05 Oct 2011 01:11:58 +1000
Message-ID: <4E8B223E.3090405@svgmaker.com>
To: www-svg@w3.org
Part of the problem with overflow="visible" is deciding what the paint 
order should be for overlapping content.  This could be defined by the 
tile rendering order (not currently defined?).  Having decided a paint 
order, overflow="visible" would only enable a subset of the patterns 
possible using David's type="wrap" (or overflow="wrap ?).

Successive tiles can paint over the overhanging content of previous 
tiles.  As with overflow="hidden", an author is forced to resort to 
drawing parts of the pattern multiple times to achieve the desired effect.

With something like type="wrap", the rendering is confined to the tile 
and avoids this issue.  In the edge case where the pattern content wraps 
and overlaps itself, the rendering order again needs to be defined - the 
order of wrapping edges/corners.  I'm not sure how useful it is to have 
a pattern wrap over itself, but the process should at least be predictable.

A simple, but perhaps not useful, case where the pattern content 
overlaps itself -

<pattern x="0" y="0" width="10" height="10" type="wrap">
   <rect x="-10" y="-10" width="30" height="30" fill="white"
         stroke="black"/>
</pattern>

Ken
Received on Tuesday, 4 October 2011 15:11:55 GMT

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