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Re: Minutes, 22 April 2010 SVG WG meweting

From: Dr. Olaf Hoffmann <Dr.O.Hoffmann@gmx.de>
Date: Fri, 23 Apr 2010 12:06:52 +0200
To: www-svg@w3.org
Message-Id: <201004231206.52846.Dr.O.Hoffmann@gmx.de>
Hello,

about still problematic path rendering issues:

>There was some discussion recently on Line caps drawing on zero
>   length lines
>
>   jeff schiller argued it was pointless, dr olaf said it was needed

I think, it might help some readers to have a link to the implementation
notes  (for example: 'for details see F.5') for stroke-linecap and 
stroke-linejoin.

The reason for previous problems was maybe, that it was not
expected to find the normative behaviour of zero length segments
in an appendix, just reading the definitions of the properties.
On the other hand, many readers might not need details directly
within the property definition, therefore such an additional link
looks like a good solution (as it is already available for the marker
with the related directionality problem).

Oh - and just because there was already a discussion (for example
with Cameron) and there seem to be problems to get the correct
direction for problematic path segments (if points or control
points coincide) - maybe it could help to provide some hints
in the appendix about this as well - if there is an interest I can
try to provide an explanation what the simple result of a mathematical
proof is, I did some time ago ...

Another question is, whether it might help implementors to
give a hint as well about the applicability of a stroke-linejoin, 
if a cusp/corner appears within a cubic path segment...


Olaf
Received on Friday, 23 April 2010 10:09:20 GMT

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