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Re: Offset

From: Dr. Olaf Hoffmann <Dr.O.Hoffmann@gmx.de>
Date: Thu, 25 Jan 2007 14:17:49 +0100
To: www-svg@w3.org
Cc: Simon.Flannery@wrsa.com.au
Message-Id: <200701251417.49978.Dr.O.Hoffmann@gmx.de>


some ideas about this (maybe there are much
more possibilities):

1. The program calculates the position of the
offset in the same coordinate system as the polyline
or path and the offset is realised with a transform
attribute. Of course, the information about the fraction
of 50/234 of the pathLength is lost.
The transform attribute can be used in general to
get some relative offset, often it will be useful
to group elements with the g element to translate
them together.

2. A path itself can be structured with stroke-dasharray
in arbitrary fractions.
Of course this is limited to the possibilities of 
stroke-dasharray, but is enough to mark a fraction 
or 50/234 of the pathLength. 

3. With animateMotion, maybe using pathLength, 
keyPoints, keyTimes, keySplines and so on it is 
possible to position any object at any fraction of 
an arbitrary path time dependent or constant in
time. Calculating correct timing will be
necessary to avoid any visible motion in the last case.
This method is limited to paths expressed in a
path element (no polyline or polygon element) or
alternatively a list of values (like a polyline or polygon).
Here only some information about the meaning of
the path is lost and the viewer needs to support
animation, even if the timing is chosen in such
a way, that nothing really moves within the
display time.
An information about the meaning of the path
can be added again using elements like title and
desc or the class attribute.
This seems to me the most comfortable solution
of the problem with a minimum of information loss,
but requires simple calculation and the
understanding of the animateMotion element of course.
Received on Thursday, 25 January 2007 13:23:21 UTC

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