Thank you for your reply.
I have modified my ActionListener:
button.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
UpdateManager um = canvas.getUpdateManager();
um.getUpdateRunnableQueue().invokeLater(new Runnable() {
public void run() {
resizeCircle();
}
});
}
});
and put canvas.setDocumentState(JSVGCanvas.ALWAYS_DYNAMIC) *before*
canvas.setDocument(doc), as the FAQ says.
Now, I only see the *last update* but not the others in between.
I also implemented updateStarted and updateCompleted methods of
UpdateManagerListener and added it to the canvas. It seems that all the
update events are being consolidated into a single event even though I
have sleep delays in between the resizings. In my real application, I
need to be able to see many dynamic updates to the SVG that occur pretty
close together. Is there anything else I can do to get the desired
behavior?
Any more thoughts would be appreciated.
> -----Original Message-----
> From: Thomas DeWeese [mailto:[EMAIL PROTECTED]
> Sent: Friday, August 08, 2003 4:33 PM
> To: Batik Users
> Subject: Re: Dynamic JSVGCanvas Updates
>
>
> Hi Grant,
>
> Please see: http://xml.apache.org/batik/faqs.html#faq-21
>
>
> Grant Mc Auley wrote:
> > Hello,
> >
> > My simple test program (relevant code below) loads an SVG
> file into a
> > JSVGCanvas. Clicking a button calls a method that
> iteratively resizes a
> > circle in the SVG document.
> >
> > What I am observing is this:
> > 1) After clicking the toolbar button, I do not see the circle resize
> > unless I move my mouse into the canvas.
> > 2) Further, unless I continually move my mouse over the
> canvas I do not
> > see the iterative resizing. That is, when I continuously move the
> > mouse, I see the circle change size every second. When I stop, the
> > circle size does not change. When I move again, I see the
> updates. If
> > I move outside of the canvas I see no updates.
> >
> > How are canvas updates related to mouse position and
> movement? Is there
> > something else that I must do to see live or dynamic canvas updates?
> >
> >
> > // ------- Code:
> >
> > JSVGCanvas canvas = new JSVGCanvas();
> > File f = new File(shapes.svg");
> > String parser = XMLResourceDescriptor.getXMLParserClassName();
> > SAXSVGDocumentFactory factory = new SAXSVGDocumentFactory(parser);
> > Document doc = factory.createDocument(f.toURL().toString());
> > canvas.setDocument(doc);
> > canvas.setDocumentState(JSVGCanvas.ALWAYS_DYNAMIC);
> >
> > ...
> >
> > button.addActionListener(new ActionListener() {
> >
> > public void actionPerformed(ActionEvent e) {
> > Thread t = new Thread(new Runnable() {
> > public void run() {
> > resizeCircle();
> > }
> > });
> > t.start();
> > }
> >
> > });
> >
> > ...
> >
> > private void resizeCircle() throws DOMException {
> >
> > SVGDocument doc = canvas.getSVGDocument();
> > Element el = doc.getElementById("circleOne");
> > for (int i = 0; i < 10; i++) {
> >
> > if (el.getAttribute("r").equals("20")) { // initial value of r
> > (radius) is 20
> > el.setAttribute("r", "50");
> > else
> > el.setAttribute("r", "20");
> > try {
> > Thread.sleep(1000);
> > }
> > catch (InterruptedException ex) {
> > }
> >
> > }
> >
> > }
> > // -------
> >
> >
> >
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> >
> >
>
>
>
>
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