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From Piyush Rai <raights...@yahoo.com>
Subject Attribute modifications don't show on canvas
Date Wed, 23 Jun 2004 09:21:59 GMT
Hi,
 
I am trying to load an SVG document on JSVGCanvas and trying to update the attribute of some
element. However, the changes are not shown on the canvas. From what I know, any modifications
made to DOM should be in the Swing update thread of the application. Also, perhaps I need
register a listener on the JSVGCanvas for the first 'gvtRenderingCompleted'  event. I have
tried to make all these changes in my application without any success. I don't know what are
the correct places to make these changes. I am giving the code here(shamelessly copied from
xml-batik page+some modifications done!!) . Please suggest how should I restructure it correctly
to achieve what I want.
 
***SVG file***
<?xml version="1.0" encoding="ISO-8859-1" standalone="no"?>
<!DOCTYPE svg PUBLIC "-//W3C//DTD SVG 20010904//EN"
    "http://www.w3.org/TR/2001/REC-SVG-20010904/DTD/svg10.dtd">
 <svg xmlns="http://www.w3.org/2000/svg" width="600" height="600">
<g>
      <path id="curve" style="stroke-width:20; stroke:#00ffff; fill:none" d="M496 496 L200
496"/> 
   </g>
</svg>

***SVGApplication***
public class SVGApplication {
    public static void main(String[] args) {
        new SVGApplication();
    }
    JFrame frame;
    JSVGCanvas canvas;
    Document document;
    Window window;
    Element curve;
    public SVGApplication() {
        frame = new JFrame();
        canvas = new JSVGCanvas();
        // Forces the canvas to always be dynamic even if the current
        // document does not contain scripting or animation.
        canvas.setDocumentState(JSVGCanvas.ALWAYS_DYNAMIC);
        canvas.addSVGLoadEventDispatcherListener
            (new SVGLoadEventDispatcherAdapter() {
                    public void svgLoadEventDispatchStarted
                        (SVGLoadEventDispatcherEvent e) {
                        // At this time the document is available...
                        document = canvas.getSVGDocument();
                        // ...and the window object too.
                        window = canvas.getUpdateManager().
                            getScriptingEnvironment().createWindow();
                        // Registers the listeners on the document
                        // just before the SVGLoad event is
                        // dispatched.
                        registerListeners();
                        // It is time to pack the frame.
                        frame.pack();
                    }
                });
        frame.addWindowListener(new WindowAdapter() {
                public void windowOpened(WindowEvent e) {
                    // The canvas is ready to load the base document
                    // now, from the AWT thread.
                    canvas.setURI("doc.svg");
                }
            });
 
  //IS IT RIGHT??  
 canvas.getUpdateManager().getUpdateRunnableQueue().invokeLater(new
     Runnable() { public void run() {
         curve.setAttributeNS(null,"d","M10 296 L236 296");//as a sample change in attribute
          }
   });

        frame.getContentPane().add(canvas);
        frame.setSize(800, 600);
        frame.show();
    }
    public void registerListeners() {
        // Gets an element from the loaded document.
        curve = document.getElementById("curve");
        EventTarget t = (EventTarget)curve;
        // Adds a 'onload' listener
        t.addEventListener("SVGLoad", new OnLoadAction(), false);
        // Adds a 'onclick' listener
        t.addEventListener("click", new OnClickAction(), false);
 
//IS IT RIGHT??
        //register a listener on the JSVGCanvas for the first 'gvtRenderingCompleted' event.
        canvas.addGVTTreeRendererListener(new GVTTreeRendererAdapter() {
              public void gvtRenderingPrepare(GVTTreeRendererEvent e) {
                                }
              public void gvtRenderingCompleted(GVTTreeRendererEvent e) {
              }
          });

    }
    public class OnLoadAction implements EventListener {
        public void handleEvent(Event evt) {
            // Make some actions here...
            // ...for example start an animation loop:
            window.setInterval(new Animation(), 50);
        }
    }
    public class OnClickAction implements EventListener {
        public void handleEvent(Event evt) {
            // Make some actions here...
            // ...for example schedule an action for later:
            window.setTimeout(new DelayedTask(), 500);
        }
    }
    public class Animation implements Runnable {
        public void run() {
            // Insert animation code here...
        }
    }
    public class DelayedTask implements Runnable {
        public void run() {
            // Make some actions here...
            // ...for example displays an alert dialog:
            window.alert("Delayed Action invoked!");
        }
    }
}


		
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