Hi,
I get the following error: java.lang.NullPointerException
after correcting the bug you pointed out...
Pls Elp
Yasmin
> Hi Yasmin,
>
> [EMAIL PROTECTED] wrote on 02/27/2006 04:50:04 PM:
>
>> I've tried using the code below, but its not displaying the red circles
>> ...This is what happens, I load the SVG document by selecting from a
> menu
>> bar, which triggers an event to load and rendering etc... once the
>> document is displayed I then click a button to get the data from the
>> database, which I store into an arrayList, at this point I store the
>> points in a separate list... and then I added the code below, and
> nothing
>> happens, I get an error Msg : null :(
>
> The error Msg probably has a stack trace if you 'expand' the window.
> Also there was a bug below (might be the problem):
> g.appendChild(g);
>
> Should be:
>
> g.appendChild(e);
>
> You can't add your self as a child.
>
>
>>
>> pls advice, ThankU
>>
>> yasmin
>>
>>
>>
>>
>>
>> > Hi Yasmin,
>> >
>> > [EMAIL PROTECTED] wrote on 02/27/2006 01:26:07 PM:
>> >
>> >> yes, it does but how does that work?
>> >
>> > Assuming there is no 'obvious' dynamic content in the
>> > SVG file already (script, event handlers, etc). You need
>> > to tell the canvas to treat your document as dynamic:
>> >
>> > canvas.setDocumentState(JSVGCanvas.ALWAYS_DYNAMIC);
>> >
>> > // Do what ever you curently do to load your SVG and get
>> > // a list of points for circles.
>> > // Once the document is loaded (onload callback or
>> > // wait for first rendering):
>> >
>> > canvas.getUpdateManager().getUpdateRunnableQueue().
>> > invokeLater(new Runnable() {
>> > public void run() {
>> > SVGDocuemnt doc = canvas.getSVGDocument();
>> > String SVGNS = "http://www.w3.org/2000/svg";; // SVG namespace
>> > Iterator i = ...; // get list of points
>> > Element g = doc.getElementById("circleGroup");
>> > while (i.hasNext()) {
>> > Point2D pt2d = i.next();
>> > Element e = doc.createElementNS(SVGNS, "circle");
>> > e.setAttributeNS(null, "cx", ""+pt2d.getX());
>> > e.setAttributeNS(null, "cy", ""+pt2d.getY());
>> > e.setAttributeNS(null, "r", "5");
>> > g.appendChild(g);
>> > }
>> > });
>> >
>> >>
>> >>
>> >>
>> >> > Well you're not adding them to a document in the file system, but
> the
>> >> > JSVGCanvas certainly has a reference to an SVGDocument in memory,
>> > right?
>> >> >
>> >> > Michael Bishop
>> >> >
>> >> > -----Original Message-----
>> >> > From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]
>> >> > Sent: Monday, February 27, 2006 1:18 PM
>> >> > To: [email protected]
>> >> > Subject: RE: Red Spots
>> >> >
>> >> > Hi there!
>> >> >
>> >> > I can't make the spots part of the document, because they are drawn
>> >> > after
>> >> > getting the information from a database (Accident database) ...is
>> > there
>> >> > a
>> >> > way when a mouse clicks on any of the spots to activate an event?
>> >> >
>> >> > ThankU
>> >> >
>> >> > yasmin
>> >> >
>> >> >
>> >> >
>> >> >
>> >> >
>> >> >> Hi Yasmin,
>> >> >>
>> >> >> [EMAIL PROTECTED] wrote on 02/27/2006 12:42:09 PM:
>> >> >>
>> >> >>> ...I've drawn the circles on the canvas, they are not part of my
> svg
>> >> >>> document such that the actual file is not altered, the the
> circles
>> >> > are
>> >> >> not
>> >> >>> individual elements - any ideas :(
>> >> >>
>> >> >> Yes, make them part of your document ;)
>> >> >> Really this is the simplest thing. If you want to minimize the
>> >> >> 'impact' on the original document put all the circle in a special
>> >> > group
>> >> >> (probably dynamically created) so you can just delete the group to
>> >> > 'reset'
>> >> >> the document. This way you can let the SVG engine do all the
> event
>> >> >> tracking.
>> >> >>
>> >> >> You could add an event listener (mouse move or the like) to the
>> >> >> rootmost SVG element and you will get notified of any mouse event
>> >> >> over any element in the document. You could then manually check
>> > these
>> >> >> points against your circles. But this seems like a bunch of extra
>> >> > work
>> >> >> for nothing.
>> >> >>
>> >> >>>
>> >> >>> yasmin
>> >> >>>
>> >> >>>
>> >> >>> > Hello,
>> >> >>> > For events, I attach an event to the entire document. For
>> >> >>> > individual elements, this may work. You'll need to get your
>> > circle
>> >> > as
>> >> >>> > an org.w3c.dom.Element.
>> >> >>> >
>> >> >>> > EventTarget eventTarget = (EventTarget) yourElement;
>> >> >>> > eventTarget.addEventListener(SVGConstants.SVG_EVENT_MOUSEDOWN,
> new
>> >> >>> > YourEventListener(), false);
>> >> >>> >
>> >> >>> > Michael Bishop
>> >> >>> >
>> >> >>> > -----Original Message-----
>> >> >>> > From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]
>> >> >>> > Sent: Monday, February 27, 2006 12:13 PM
>> >> >>> > To: [email protected]
>> >> >>> > Subject: Red Spots
>> >> >>> >
>> >> >>> >
>> >> >>> > Hi Michael Bishop,
>> >> >>> >
>> >> >>> > I have been beavering on my project and have successfully
>> > converted
>> >> > my
>> >> >>> > screen coordinates to documents and can interact with my
> database
>> >> > to
>> >> >>> > retrieve the information for the current view and show red
> spots
>> > on
>> >> >> the
>> >> >>> > areas where accidents have happend on the map ...now I need to
>> > make
>> >> >> the
>> >> >>> > red spots active so when a user clicks on a red spot the
> relevant
>> >> >>> > information about that particular accident is displayed ...i
>> > simply
>> >> >> used
>> >> >>> > the following code to create the red spot:
>> >> >>> >
>> >> >>> > Graphics spot = canvas.getGraphics();
>> >> >>> > spot.setColor(Color.RED);
>> >> >>> > spot.fillOval(x,y,22,22);
>> >> >>> > spot.dispose();
>> >> >>> >
>> >> >>> > but i cant assign an ActionEvent to the spot ...Any ideas?
>> >> >>> >
>> >> >>> > Many thanks in advance :)
>> >> >>> >
>> >> >>> > Yasmin
>> >> >>> >
>> >> >>> >
>> >> >>> >
>> >> >>> >
>> >> >>> >> <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 3.2//EN">
>> >> >>> >> <HTML>
>> >> >>> >> <HEAD>
>> >> >>> >> <META HTTP-EQUIV="Content-Type" CONTENT="text/html;
>> >> >>> > charset=iso-8859-1">
>> >> >>> >>
>> >> >>> >>
>> >> >>> >> <META NAME="Generator" CONTENT="MS Exchange Server version
>> >> >>> > 6.5.7226.0">
>> >> >>> >> <TITLE>RE: Coordinates</TITLE>
>> >> >>> >> </HEAD>
>> >> >>> >> <BODY>
>> >> >>> >> <DIV id=idOWAReplyText99836 dir=ltr>
>> >> >>> >> <DIV dir=ltr><FONT face=Arial color=#000000 size=2>Element
>> > element
>> >> >>
>> >> >>> >>
>> >> >
> svgDocument.createElement(SVGConstants.SVG_CIRCLE_TAG);</FONT></DIV>
>> >> >>> >> <DIV dir=ltr><FONT face=Arial
>> >> >>> >> size=2>element.setAttribute(SVGConstants.SVG_CX_ATTR,
>> >> >>> >> xPosition);</FONT></DIV>
>> >> >>> >> <DIV dir=ltr><FONT face=Arial
>> >> >>> >> size=2>element.setAttribute(SVGConstants.SVG_CY_ATTR,
>> >> >>> >> yPosition);</FONT></DIV>
>> >> >>> >> <DIV dir=ltr><FONT face=Arial
>> >> >>> >> size=2>element.setAttribute(SVGConstants.SVG_R_ATTR,
>> >> >>> > radius);</FONT></DIV>
>> >> >>> >> <DIV dir=ltr><FONT face=Arial
>> >> >>> >> size=2>element.setAttribute(SVGConstants.SVG_FILL_ATTR,
>> >> >>> >> "red");</FONT></DIV>
>> >> >>> >> <DIV dir=ltr><FONT face=Arial
>> >> >>> >>
>> >> > size=2>svgDocument.getDocumentElement.append(element);</FONT></DIV>
>> >> >>> >> <DIV dir=ltr><FONT face=Arial size=2></FONT> </DIV>
>> >> >>> >> <DIV dir=ltr><FONT face=Arial size=2>Use code completion or
> the
>> >> > Batik
>> >> >>> >> Javadoc. Most of those SVGConstants references are
> probably
>> >> >>> >> wrong.</FONT></DIV>
>> >> >>> >> <DIV dir=ltr><FONT face=Arial size=2></FONT> </DIV>
>> >> >>> >> <DIV dir=ltr><FONT face=Arial size=2>Michael
>> >> >> Bishop</FONT></DIV></DIV>
>> >> >>> >> <DIV dir=ltr><BR>
>> >> >>> >> <HR tabIndex=-1>
>> >> >>> >> <FONT face=Tahoma size=2><B>From:</B> [EMAIL PROTECTED]
>> >> >>> >> [mailto:[EMAIL PROTECTED]<BR><B>Sent:</B> Sun 2/19/2006
>> >> > 3:07
>> >> >>> >> PM<BR><B>To:</B>
>> >> >> [email protected]<BR><B>Subject:</B>
>> >> >>> > RE:
>> >> >>> >> Coordinates<BR></FONT><BR></DIV>
>> >> >>> >> <DIV>
>> >> >>> >> <P><FONT size=2>me again!<BR><BR>...I think I don't need to
>> >> > convert
>> >> >>> > back
>> >> >>> >> to
>> >> >>> >> screen coordinates I should be<BR>able to use the document
>> >> >>> > coordinates,
>> >> >>> >> but how
>> >> >>> >> can I draw a red-spot<BR>(filled circle) and a given location
> on
>> >> > the
>> >> >>> >> canvas?<BR><BR>ThankU in advance<BR><BR>yasmin<BR><BR>>
>> >> >>> > <!DOCTYPE
>> >> >>> >> HTML
>> >> >>> >> PUBLIC "-//W3C//DTD HTML 3.2//EN"><BR>>
>> > <HTML><BR>>
>> >> >>> >> <HEAD><BR>> <META HTTP-EQUIV="Content-Type"
>> >> >>> >> CONTENT="text/html;
>> >> >>> >> charset=iso-8859-1"><BR>><BR>><BR>> <META
>> >> >>> > NAME="Generator"
>> >> >>> >> CONTENT="MS Exchange Server version 6.5.7226.0"><BR>>
>> >> >>> >> <TITLE>Coordinates</TITLE><BR>>
>> >> > </HEAD><BR>>
>> >> >>> >> <BODY><BR>> <DIV id=idOWAReplyText8269
>> >> >> dir=ltr><BR>>
>> >> >>> >> <DIV
>> >> >>> >> dir=ltr><FONT face=Arial color=#000000 size=2>Not
> sure;
>> >> >>> > haven't
>> >> >>> >> done<BR>> it in<BR>> reverse.&nbsp; There is a
> method
>> >> > for
>> >> >> an
>> >> >>> >> SVGLocatable called getScreenCTM<BR>> that<BR>> may be
> of
>> >> >>> >> use.</FONT></DIV><BR>> <DIV
> dir=ltr><FONT
>> >> >>> >> face=Arial
>> >> >>> >> size=2></FONT>&nbsp;</DIV><BR>> <DIV
>> >> >>> >> dir=ltr><FONT face=Arial size=2>Michael
>> >> >>> >> Bishop</FONT></DIV></DIV><BR>> <DIV
>> >> >>> >> dir=ltr><BR><BR>> <HR tabIndex=-1><BR>>
>> >> > <FONT
>> >> >>> >> face=Tahoma size=2><B>From:</B>
>> >> >>> >> [EMAIL PROTECTED]<BR>>
>> >> >>> >> [<A
>> >> >>> >>
>> >> >>> >
>> >> >>
>> >> >
>> >
> href="mailto:[EMAIL PROTECTED]">mailto:[EMAIL PROTECTED]</A>
>> >> >>> > ]<BR><B>Sent:</B>
>> >> >>> >> Sun 2/19/2006 1:08<BR>> PM<BR><B>To:</B>
>> >> >>> >>
>> >> >>> >
>> >> >>
>> >> >
>> >
> [email protected]<BR><B>Subject:</B><
>> >> >>> > BR>>
>> >> >>> >>
> Coordinates<BR></FONT><BR></DIV><BR>>
>> >> >>> >> <DIV><BR>> <P><FONT size=2>Hi Michael
>> >> >>> >> Bishop,<BR><BR>...I've converted my screen<BR>>
>> >> >>> > coordinates
>> >> >>> >> to my
>> >> >>> >> document coordinates - now<BR>I'm trying to
> convert<BR>>
>> >> >>> >> document<BR>> coordinates to screen coordinate so that
>> >> >>> > at<BR>that
>> >> >>> >> point
>> >> >>> >> on the map, I<BR>> can draw<BR>> a red_spot on the
>> >> > canvas...any
>> >> >>> >> ideas?<BR><BR>ThankU in<BR>>
>> >> >>> >>
>> >> >>> >
>> >> >>
>> >> >
>> >
> advance<BR><BR>yasmin<BR><BR><BR>---------
>> >> >>> >
>> >> >>
>> >> >
>> >
> ------------------------------------------------------------<BR>To
>> >> >>> > <BR>>
>> >> >>> >> unsubscribe, e-mail:
>> >> >>> >>
>> >> > [EMAIL PROTECTED]<BR>For<BR>>
>> >> >>> >> additional
>> >> >>> >> commands, e-mail:<BR>>
>> >> >>> >>
>> >> >>> >
>> >> >>
>> >> >
>> >
> [EMAIL PROTECTED]<BR></FONT></P>
>> >> >>> > </DIV><BR>><BR>>
>> >> >>> >> </BODY><BR>>
>> >> >>> >>
>> >> >>> >
>> >> >>
>> >> >
>> >
> </HTML><BR><BR><BR><BR>-------------------------------------------
>> >> >>> > --------------------------<BR>To
>> >> >>> >> unsubscribe, e-mail:
>> >> >>> > [EMAIL PROTECTED]<BR>For
>> >> >>> >> additional commands, e-mail:
>> >> >>> >> [EMAIL PROTECTED]<BR></FONT></P></DIV>
>> >> >>> >>
>> >> >>> >> </BODY>
>> >> >>> >> </HTML>
>> >> >>> >
>> >> >>> >
>> >> >>> >
>> >> >>> >
>> >> >
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