Hello Matthew,
I think that you didn't put a listener in the correct/normal use.
I will give you an small example how to put a circle on a canvas on mouse
clicks.
Code:
=====
//We are going to react on mouse clicks, so the appropriate listener is
added
svgCanvas.addMouseListener(this);
// The following line is needed for our canvas to react on every change of
the document
// associated with it
svgCanvas.setDocumentState(JSVGCanvas.ALWAYS_DYNAMIC);
............
public void mouseClicked(MouseEvent e) {
addBall(e.getX(), e.getY());
}
private void addBall(int x, int y) {
// The code is put into a Runnable object
final int a = x;
final int b = y;
Runnable r = new Runnable() {
public void run() {
Element root = canvas.getSVGDocument().getDocumentElement();
doc = (SVGDocument) canvas.getSVGDocument();
// A new ball is created
Element circle = doc.createElementNS(svgNS,
"circle");
circle.setAttributeNS(null, "stroke", "black");
circle.setAttributeNS(null, "stroke-width", "1");
circle.setAttributeNS(null, "r", "" + 5);
circle.setAttributeNS(null, "cx", "" + a);
circle.setAttributeNS(null, "cy", "" + b);
root.appendChild(circle);
}
};
// Running our code in the UpdateManager thread
UpdateManager um = canvas.getUpdateManager();
um.getUpdateRunnableQueue().invokeLater(r);
}
Pay attention on what you "listen" and how you update your canvas and I
think that you will get it.
PS: Please excuse my English.
Regards,
On Jan 20, 2008 11:47 PM, Matthew Wilson < [EMAIL PROTECTED]> wrote:
> Hi,
> I have written a Swing component which wraps JSVGCanvas, and I would
> like to capture DOM mouse click events so that I can draw on the canvas
> where the user has clicked. So I register and define my event listener
> like this:
>
> public class PlanViewPanel extends JPanel implements MouseWheelListener,
> EventListener, SVGLoadEventDispatcherListener {
>
> ....... stuff ......
>
> public PlanViewPanel(SVGDocument svg) {
> svgCanvas.setDocument(svg);
> svgCanvas.addMouseWheelListener(this); // this is for
> something else entirely
> scrollPane = new JSVGScrollPane(svgCanvas);
> scrollPane.setScrollbarsAlwaysVisible(true);
>
> scrollPane.setPreferredSize(Toolkit.getDefaultToolkit().getScreenSize());
> add(scrollPane);
> setMinimumSize(new Dimension(800,600));
>
> svgCanvas.getSVGDocument().getRootElement().addEventListener("click",
> this, false);
> }
>
> .... stuff ....
> public void handleEvent(org.w3c.dom.events.Event evt) {
> System.out.println("did something");
>
> }
>
> }
>
> but my event handler is never called (I've placed a breakpoint and run
> it in the eclipse debugger to confirm this). I have confirmed also
> using a debugger that the event handler is present in the hashtable in
> the document root's EventSupport structure, but I do not understand why
> it is not called. I have messed around with various different event
> types and tried bubble/capture, but nothing works.
>
> Using JDK 1.6.0 and Batik 1.7.
>
> Any suggestions would be greatly appreciated.
>
> Matthew Wilson.
>
>
>
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