getting Update Manager for JSVGCanvas...

[Reinhard Brandstädter <r....@gmx.at>]

Jan suggested updating a SVGDocument displayed in a JSVGCanvas via the 
UpdateManager, but now I'm struggling with getting the UpdateManager for 
my canvas.

I'm new to Batik and just playing around a little bit, but the Javadoc 
isn't very helpful...

How do I create a UpdateManager so that I can use it in the way 
described by Jan below?

I tried something (useless as the UpdateManager returned is null) like this:
This test should only "move" the rectangle "myrect" accross the canvas (?)
------
svgCanvas.setSVGDocument(svgDoc);
svgCanvas.getUpdateManager(). \\
getUpdateRunnableQueue().invokeLater(new Runnable() {
   public void run() {
     int x=0, y=0;
     for (;;) {
       x = (x+1)%400;
       y = (y+1)%400;
       Element e = svgDoc.getElementById("myrect");
       e.setAttribute("x",(new Integer(x)).toString());
       e.setAttribute("y",(new Integer(y)).toString());
     }
   }
}
);
------

thx,
Reinhard

Lolling, Jan wrote:
> OK now it is clear.
> 
> BATIK is the right think to solve your task.
> 
> Than all comments from Vincent are correct and the best way to create and remove elements is manipulating the DOM in the update manager.
> 
> You can retrieve this from JSVGCanvas methode 
> getUpdateManager().getUpdateRunnableQueue().invokeLater(yourDOMUpdateRunnable);
> 
> here is an code snippet---------------
> 
>                 canvas.getUpdateManager().getUpdateRunnableQueue().invokeLater(new Runnable() {
>                     public void run() {
>                         Element rectangle = document.createElementNS(svgNS, "rect");
>                         rectangle.setAttributeNS(null, "x", String.valueOf(x));
>                         rectangle.setAttributeNS(null, "y", String.valueOf(y));
>                         rectangle.setAttributeNS(null, "width", String.valueOf(ddx));
>                         rectangle.setAttributeNS(null, "height", String.valueOf(ddy));
>                         rectangle.setAttributeNS(null, "style", "fill:white; stroke:black");
>                         svgRoot.appendChild(rectangle);
>                     } //run
>                 });
> 
> ---------------------------------


-- 
Reinhard Brandstaedter   r.brandstaedter@gmx.at  GPG: 0x033B81DB
-    Student of Computer Science - J.K. University of Linz     -
-        <ICQ: 73059068>    <Mobile: +43 699 12419541>         -
-                  http://adelaide.dnsalias.net                -


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