Hello Cojocar,
Thank you for taking the time to reply and write an example. However, I
don't think I explained myself very well. As I understand it, the code
you posted uses the Java AWT mouse listener directly, rather than using
the SVG DOM event listener. Therefore the co-ordinates retrieved using
e.getX() and e.getY() are the screen co-ordinates (relative to the
svgCanvas), rather than the SVG client co-ordinates. Therefore, when
they are used to draw on the svgCanvas, the circle does not appear where
I clicked (testing your code in my application, the circles appear about
20 px up and to the left of where I clicked, due to a translate on the
document). I need to be able to zoom, pan etc my SVG document and still
have the circles appear in the correct place. This is why I thought I
should be using the DOM event listener, as I could then get the
co-ordinates of the mouse click in terms of the SVG document client
co-ordinate system, and hence draw in the correct place. Please correct
me if I am wrong.
Thanks again for your help,
Matthew.
On Mon, 2008-01-21 at 20:24 +0200, Cojocar Cosmin wrote:
> 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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