Hi Zhao,
"comlong zhao" <[EMAIL PROTECTED]> wrote on 08/09/2006 12:00:28 PM:
> Thanks a lot for your suggestion. I used a really large Button to
try
> whether it could work well.
What do you mean "a really large Button"? there is no button in SVG.
> Now, by your words, it seems the GVTtree is not changed by my
code. I
> have to modifies the document to change the GVTtree, but not only by the
code
> of "ad.mouseClicked(evt);" .Is it right?
Why would you expect that dispatching an event would change GVTtree?
> And, what is the event handler I could use? Could you explain a
litter
> more? What is the correlative method I could use.
There are several ways to add a DOM event handler. The simplest is by
using one of the event attributes in the SVG:
<!--- very large rect which should turn blue when mouse moves over
it -->
<rect onmousemove="evt.target.setAttribute('fill', 'blue')"
x="-1000%" y="-1000%" width="3000%" height="3000%"
fill="red"/>
You can also investigate W3C DOM Events spec in particular the
'EventTarget.addEventHandler' method, which you can call from Java to
add event handlers to just about any rendered SVG Element.
> On 8/9/06, [EMAIL PROTECTED] <[EMAIL PROTECTED]> wrote:
> Hi Zhao,
>
> "comlong zhao" <[EMAIL PROTECTED]> wrote on 08/09/2006 04:13:03 AM:
>
> > First, I want to ask what is difference between the GVTtree
and
> the
> > GraphicsNode. If the GVTtree is changed, whether the GraphicsNode is
> changed
> > too? more details more better. thanks a lot.
>
> The GVT tree is the collection of GraphicsNodes. Put another way
> the GraphicsNodes are the nodes in the GVT tree.
>
> > For my project, I do not use the JSVGCanvas, the event is
come
> from
> > Canvas3D. I use the AWTEventDispatcher, the instance named "ad". I
use
> the
> > normal way that
>
> The code all looks pretty good. The important thing to know is that
> an event is only dispatched in the SVG tree if the mouse event is over
> an SVG element.
>
> > ad.setRootNode(gvtRoot);
> > ad.setBaseTransform(curTxf); //curTxf is the
AffineTransform
>
> The mouse coordinates in evt are transformed to the user coordinate
> system of the root SVG element by 'curTxf' this point is then checked to
> see if it is inside any of the SVG elements if it is then a mouse event
> is dispatched. Otherwise no event will be dispatched. Also obviously
> you must have an event handler that modifies the document, simply
> dispatching
> an event won't change anything.
>
> I would start with a very simple SVG document that just contains a
> very large rectangle (much larger than the 'displayed' document) and
have
> a mousemove handler that prints the clientX/Y of the DOM event to see
what
> you
> are getting and if they make sense.
>
> > And then from the Frame I could call the MouseEvent of like
> this:
> > public void mouseEvent1(final MouseEvent evt){ //transport
> the
> > parameter of evt to this method
> > final Element rect = r; // the element r has been
> initialized
> > RunnableQueue rq = manager.getUpdateRunnableQueue(); //
add
> the
> > event to RunableQueue
> > try { rq.invokeAndWait(new Runnable() {
> > public void run() {
> > ad.mouseClicked(evt); // set
> mouse
> > event to change the GTV tree
> > rect.setAttributeNS(null, "x", ""+5); //
> > setAttribute of the document
> > };
> > });
> > } catch (InterruptedException ie) {
> > ie.printStackTrace();
> > }
> > if(manager.getUpdateTracker().hasChanged()) // test
> whether
> > the GVTtree has been changed
> > System.out.println("GTV changed"); }
>
> > But unfortunately, I could find the GVTtree has been changed
only
> by
> > the Attribute changed. If I removed the line of attribute, it seems
that
> the
> > GTVTree will not been changed. I want to know whether this is a right
> way
> > that just only setRootNode() and then call the mouseCliked(). Or I
> should add
> > some code. For the RunableQueue, I think this way is right, because if
I
>
> > removed it, I can not see the result of the Attribute changed.
> > What should I do to change the GVTtree by one mouseclick?
> > Thanks a lot
> > Regards
> > zhao
>
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