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From Helder Magalhães <helder.magalh...@gmail.com>
Subject Re: batik performances best practices
Date Sat, 24 May 2014 19:00:52 GMT
Hi David,

I'd highly recommend using SMIL [1] to achieve those animated effects
(which should feel more intuitive and/or designer friendly) or, in
alternative, manipulate the DOM directly using Java [2] - faster - or
JavaScript [3]  - slower but with lots of utility libraries available.

Given your narrowed question I'm assuming you've already taken a good look
at the documentation, but I still didn't quite understand what does the
"animated background" stand for, as well as what the main animation looks
like. An example (maybe a small video recording, though a textual
explanation will also work) might help understanding what is the desired
goal and, so, receiving better feedback.


[1] http://www.w3.org/TR/SVG11/animate.html
[2] http://xmlgraphics.apache.org/batik/using/scripting/java.html
[3] http://xmlgraphics.apache.org/batik/using/scripting/ecmascript.html
Em 10/03/2014 16:06, "David Delbecq" <delbd@meteo.be> escreveu:

> Hello,
> we have developped a swing application that uses batik as it's main
> rendering interface, mainly because it was a vector based application. This
> application has an animation button, where, frame after frame, we change
> the content of the svg tree, mainly by raplacing a whole subtree. This
> basicaly look like this
> setCurrentFrame(int frame){
>     SVGElement newChild = getSVG(frame);
>     element.replaceChild(oldChild,newChild);
>     oldChild = newChild();
> }
> called in a loop. The best we achieve is 12fps this way. If we remove the
> animated background, we go up to 19fps. It's simplified, the real operation
> are done using a Runnable added to the updatequeue of batik, so visual is
> up to date.
> My problem is that batik recalculates, for newChild, the GVT, which is
> obviously needed to display the SVG on the JSVGCanvas. Profiling operation
> show most of my time (~80%) is spent in GVT builder. Is there some way to
> tell batik to remember "newChild" so that, next time (next loop) i reinsert
> newChild, it doesn't need to rebuild the GVT tree but can reuse the
> previous one?
> Do you have any recommandation on how to handle animations with better
> performances?
> thanks for help
> David Delbecq

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