noni_4444 wrote:
>
> I have an SVG document containing a rectangle which is to be animated
> repeatedly depending upon a value received in a callback function. The
> SVG document is loaded inside an applet. The problem i face is that
> SVGCanvas is not updated automatically until i minimize the html page
> containing the applet and maximize it. Doing this calls the repaint method
> of applet. If i call the repaint method myself inside the callback method,
> i see the canvas flickering. I have already read a dozen posts on this
> forum
> related to this and have tried all the suggested solutions. All point to
> something like
>
> "If you set the canvas's document state to JSVGCanvas.ALWAYS_DYNAMIC and
> run
> all your document updates in the UpdateManager, it should update itself".
>
> What to do to update the SVG canvas without calling repaint() ? I am
> already following
> the above guideline.
>
> Following are relevant portions of my code.
>
> public class BatikApplet extends Applet {
> UpdateManager updateManager = null;
>
> //Initialize the applet
> public void init() {
> jbInit();
> svgCanvas = new JSVGCanvas();
> svgCanvas.setDocumentState(JSVGCanvas.ALWAYS_DYNAMIC);
> String parser =
> XMLResourceDescriptor.getXMLParserClassName();
> docFactory = new SAXSVGDocumentFactory(parser);
> rectDoc =
> docFactory.createSVGDocument("http://localhost:8080/"+screenName);
> registerListeners();
> svgCanvas.setDocument(rectDoc);
> this.add(svgCanvas, BorderLayout.NORTH);
> svgCanvas.repaint();
> }
>
> // Paint method
> public void paint(Graphics g) {
> svgCanvas.paintComponent(g);
> }
>
> // Method which is called repeatedly with updated animation values to be
> drawn
> public synchronized void callback(final String strData) {
> runnable = new Runnable() {
> public void run() {
> //Call to external object which changes the SVG
> document
> oAnimEngine.animateScreen(strData);
> }
> };
>
> try {
>
> updateManager.getUpdateRunnableQueue().invokeLater(runnable);
> } catch (Exception ex) {
>
> }
> }
>
> // Register listener method
> public void registerListeners() {
> svgCanvas.addGVTTreeRendererListener(new
> GVTTreeRendererAdapter() {
> public void gvtRenderingCompleted(GVTTreeRendererEvent
> e) {
> updateManager = svgCanvas.getUpdateManager();
> oAnimEngine.setCustomSVGDocument(rectDoc);
> }
> });
> }
> }
>
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