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Re: SVG2 - suggestion for a new path command to close a subpath smoothly

From: Doug Schepers <schepers@w3.org>
Date: Sat, 01 Dec 2012 14:51:37 -0500
Message-ID: <50BA5FC9.40402@w3.org>
To: "Dr. Olaf Hoffmann" <Dr.O.Hoffmann@gmx.de>
CC: www-svg@w3.org
Hi, Dr. Olaf-

On 12/1/12 12:01 PM, Dr. Olaf Hoffmann wrote:
>
> there was already some discussion about new
> path commands in SVG2 to simplify the work
> of authors.
> I propose to introduce a new path command
> as an extension of the commands S and Z.
>
> This closes a subpath similar to the Z command,
> but not with a straight line. It uses a cubic
> curve like the S command. The first control
> point it determined by the previous point and
> its direction as for the S command.
> The second control point is determined in a
> similar way, but the first point of the subpath
> that has to be closed is used and its direction.
> The resulting effect is, that it is simpler for
> authors to close shapes in a smooth way without
> a corner.
> Today authors have to compute especially the
> second control point manually to get this effect.
> With some knowlegde in analysis (mathematics), this
> is not difficult, but unfortunately it cannot be
> assumed, that all authors have such capabilities.
>
> If information about the direction to determine the
> control points is not available, corresponding rules
> as for S apply (typically with the result, that there
> will be corners again, but to avoid this is usually a
> simple task for authors).

This seems very sensible to me.



> Suggestions for naming:
> Because 'ß' (ligature for 'sz') would be only an intuitive
> name for german speaking people, maybe another name
> would be more preferable like 'Y' or 'R'. 'O' would be very
> suggestive, but can be mixed up with '0' (zero). 'B' would be
> another, less suggestive choice, but with less problems as 'O'.

The name would probably be the hardest part of this to decide... :P

So, I suggest we consider the functionality first, then try to decide a 
command after.

Regards-
-Doug
Received on Saturday, 1 December 2012 19:51:45 GMT

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