Hi Hauke,
SMIL is a declarative way to define interactivity and animation (doesn't
require scripting but can interact with scripting). It can start an
animation based on another mouse or keyboard event. If you read the
animation chapter in the SVG specification or a SMIL intro you'll get
the idea.
But from what I read regarding your problem it sounds like a combination
of script and SMIL might be required.
With script you can fetch the data (use something like getURL/postURL or
XMLHttpRequest (in browsers)) process the data and then place a little
symbol to where you want it to have, using .getPointAtLength(). The
problem is, that you probably want to auto-orient the symbol according
to the tangent angle at the given point along the curve. As far as I
know there is no scripting way to do this, but the SMIL method
animateTransform can auto orient objects along a path. But luckily you
can create SMIL elements with script and just create a new
animateTransform element and tweak its values.
http://www.eminerllc.com/demos/SVG/Menu.svg has a few examples similar
to what you want to do. Some examples use old, incompatible code made
for the Adobe viewer, but the ones that are marked with the firefox icon
should also run on Batik, Opera and Safari. I think most of the examples
are script based, since Firefox doesn't support SMIL yet.
Hope this helps a little bit,
Andreas
This sounds quite what I want to do, expect one thing (sorry, I'm an SVG
newbie, so I'm not exactly sure, what features SMIL provides): as I
understand, the animations of SMIL are synchronized to time. However I
need to trigger these animations manually, resp. by some external events.
For example I want to define a gauge, that displays some sensor value
that some other program regularly sends to my application. So I need to
animate the needle of the gauge corresponding to external input and not
to predefined time. Is it possible to do this with batik (with SMIL?)?
Best regards,
Hauke
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Andreas Neumann
Institute of Cartography
ETH Zurich
Wolfgang-Paulistrasse 15
CH-8093 Zurich, Switzerland
Phone: ++41-44-633 3031, Fax: ++41-44-633 1153
e-mail: [EMAIL PROTECTED]
www: http://www.carto.net/neumann/
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