Re: Batik Question

[Thomas DeWeese]

don undeen wrote:

wow, thanks for your swift reply, Thomas.

I read your pdf presentation (I can tell I'll be
referring to that document quite a bit in the future,
thank you!), particularly the part with the code
snippet:
document = canvas.getSVGDocument();
elem = document.getElementById("foo");
elem.addEventListener([event-type],[listener],[use-capture]);
That makes sense to me, but my difficulty is that elem
doesn't seem to have a method named addEventListener.
The interface for org.w3c.dom.Element doesn't describe
any such method, and I get compile errors saying
there's no such method.
am I using the wrong version of something?
Hi Don,

   Sorry, you need to down cast to an EventTarget.
   So the code snippet should be:
   ((EventTarget)elem).addEventListener(....);

   The example came from JavaScript where this isn't needed.

yours,
Don
--- Thomas DeWeese <[EMAIL PROTECTED]> wrote:

Hi Don,

   Sounds like you need to do some reading over the
holidays :)
   My Recommended reading list is, the SVG DOM:
        
http://xml.apache.org/batik/javadoc/org/w3c/dom/svg/package-summary.html

   It (and all other graphics elements in SVG)
implements the
EventTarget interface:

http://www.w3.org/TR/2000/REC-DOM-Level-2-Events-20001113/java-binding.html

   This has the add/remove methods.  You may also
want to read the
rest of the DOM Events spec (it's really not that
large) as it
describes exactly how the events are dispatched in
the document tree
in particular the roles of 'target' and
'currentTarget'.
   Finally I'm sure the PDF of my presentation at
ApacheCON will keep
you up late at night anxious to see how it turns out
:)
  

http://cvs.apache.org/~deweese/ac2003/ApacheCON2003.pdf

   If you snoop there is also an SVG version of the
presentation but
it lacks the commentary which is probably of the
most interest to you.
You may want to start with this as it will give you
a high level
overview of many of the things that can be done with
Batik.
   Enjoy!

don undeen wrote:


Hi There,
I've been reading this thred with interest,
because

I'm trying to accomplish something similar.
I'm using batik to generate SVG output for display
in

a Java application. I'm putting text and lines
(with

unique "id" attributes)  in the SVG display, and I
want the java app to be notified when the mouse
passes

over, or is clicked on, a text or line element.
You say:"The easiest thing to do is add a DOM
'click'

event listener on the root SVG element."
If by "root SVG Element" you mean the element you
get

from:
DOMImplementation impl =
SVGDOMImplementation.getDOMImplementation();
   this.svgDoc =
(SVGDocument)impl.createDocument(svgNS, "svg",
null);

   this.svgRoot = svgDoc.getDocumentElement();

Then I don't see how to add a listener to svgRoot,
as

it doesn't have any addListener methods. Neither
does

svgDoc.

However, the svgCanvas I get from
 this.svgCanvas = new JSVGCanvas();
does have listener Methods. Is that where I should
register a listener? And if so, could you tell me
which listener, and how to find out the id of the
clicked element? 

Where does the DOMEvent come from?

Thanks in advance for any advice you can give me.
I'm

really stimied on this one.

Yours,
Don Undeen (New member of this newsgroup)


--- Thomas DeWeese <[EMAIL PROTECTED]>
wrote:

Jamie wrote:



Specifically then Thomas, would the call be:

documentX =
SVGElement.getScreenCTM(DOMEvent.getClientX());


documentY =
SVGElement.getScreenCTM(DOMEvent.getClientY());

  No, you can take a look at:
      



samples/tests/spec/scripting/currentScaleTranslate.svg

  It does all the right things in JavaScript
(look

at 'mouseOver')
you will have to translate back to Java but it's
pretty straight
forward.



----- Original Message -----
From: "Thomas DeWeese" <[EMAIL PROTECTED]>
To: "Batik Users" <[EMAIL PROTECTED]>
Sent: Thursday, December 18, 2003 11:33 AM
Subject: Re: Batik Question




Omar Abdala wrote:




I have a question about using Java Batik. I
have

a JSVGCanvas within


which



I'm displaying SVG files. I want to add a
listener to it that will


listen



for mouse clicks on the Canvas and calculate
the

point that was clicked


in



terms of the SVG files' coordinates. Is there
some standard way of doing


this or is it an easy calculation?
  The easiest thing to do is add a DOM 'click'
event listener on the


root SVG element.  Then you can use
SVGElement.getScreenCTM to get


the transform from any SVG element's coordinate
system to the screen


coordinate system (the coordinate system for
DOMEvent.getClientX/Y).





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