dynamically adding an element to svgdocument

[ch...@infowayconsulting.net]

Hi All

Iam trying to add an element dynamically to the svgdocument 
bound to a JSVGCanvas. Iam doing this inside 
updatemanagerthread but it doesn't work. can anybody suggest 
what iam doing wrong here.
The following code snippet is inside a 
dynamicUpdatebutton.addActionListener(new ActionListener() {
			   public void actionPerformed
(ActionEvent ae) {  
svgCanvas.getUpdateManager().getUpdateRunnableQueue
().invokeLater(
						    new 
Runnable() {
						          
public void run() {
	  	  
						          
	  SVGDocument svgdoc=svgCanvas.getSVGDocument();
							    
Element elt = svgdoc.createElement("a");
  elt.setAttribute("xlink:href","http://www.ibm.com/");
Element polygon = svgdoc.createElement("polygon");
	polygon.setAttribute("points","60 160,165 172,180 
60,290 290,272 280,172 285,250 255");
	  polygon.setAttribute("style","fill:dimgrey");
	  elt.appendChild(polygon);
	  svgdoc.getRootElement().appendChild(elt);
	  svgCanvas.setDocumentState
(JSVGCanvas.ALWAYS_DYNAMIC);
	  svgCanvas.setSVGDocument(svgdoc);
	}
					
	                         });

Thanks in advance
Chandra

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Re: dynamically adding an element to svgdocument

[Thomas DeWeese <Th...@Kodak.com>]

Hi Chandra,

>>                                 Element elt = svgdoc.createElement("a");
>>   elt.setAttribute("xlink:href","http://www.ibm.com/");

There is one more thing you are missing.  SVG/Batik is a namespace
aware language/processor so you need to take care to use namespaces
properly:

SVG_NS = "http://www.w3.org/2000/svg";
XLINK_NS = "http://www.w3.org/1999/xlink";

// Use this for all SVG elements.
Element elt = svgdoc.createElementNS(SVG_NS, "a");

// Use this for "xlink" attributes.
elt.setAttributeNS(XLINK_NS, "xlink:href","http://www.ibm.com/");

// Use either for "unprefixed" attributes (I've been told that
// the ns one is better than the non-ns one but I'm not 100%
// certain I agree there should be a difference).
elt.setAttributeNS(null, "style", "fill:blue");
elt.setAttribute("stroke", "none");


Jorg Heymans wrote:

> This should come first:
> 
> svgCanvas.setDocumentState(JSVGCanvas.ALWAYS_DYNAMIC);
> 
> furthermore, there is no need IMO to set the document back on the canvas 
> as you're updating it in place.
> 
> And not all of your code below needs to be invoked from the update mgr 
> thread, only the svgdoc.getRootElement().appendChild(elt); is modifying 
> the document really.



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Re: dynamically adding an element to svgdocument

[Jorg Heymans <jh...@domek.be>]

This should come first:

svgCanvas.setDocumentState(JSVGCanvas.ALWAYS_DYNAMIC);

furthermore, there is no need IMO to set the document back on the canvas 
as you're updating it in place.

And not all of your code below needs to be invoked from the update mgr 
thread, only the svgdoc.getRootElement().appendChild(elt); is modifying 
the document really.

HTH
Jorg
chandrasrini@infowayconsulting.net wrote:
> Hi All
> 
> Iam trying to add an element dynamically to the svgdocument 
> bound to a JSVGCanvas. Iam doing this inside 
> updatemanagerthread but it doesn't work. can anybody suggest 
> what iam doing wrong here.
> The following code snippet is inside a 
> dynamicUpdatebutton.addActionListener(new ActionListener() {
> 			   public void actionPerformed
> (ActionEvent ae) {  
> svgCanvas.getUpdateManager().getUpdateRunnableQueue
> ().invokeLater(
> 						    new 
> Runnable() {
> 						          
> public void run() {
> 	  	  
> 						          
> 	  SVGDocument svgdoc=svgCanvas.getSVGDocument();
> 							    
> Element elt = svgdoc.createElement("a");
>   elt.setAttribute("xlink:href","http://www.ibm.com/");
> Element polygon = svgdoc.createElement("polygon");
> 	polygon.setAttribute("points","60 160,165 172,180 
> 60,290 290,272 280,172 285,250 255");
> 	  polygon.setAttribute("style","fill:dimgrey");
> 	  elt.appendChild(polygon);
> 	  svgdoc.getRootElement().appendChild(elt);
> 	  svgCanvas.setDocumentState
> (JSVGCanvas.ALWAYS_DYNAMIC);
> 	  svgCanvas.setSVGDocument(svgdoc);
> 	}
> 					
> 	                         });
> 
> Thanks in advance
> Chandra


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