RE: batik JSVGCanvas won't display

[Thomas E Deweese <th...@kodak.com>]

>>>>> "BR" == Baron, Randy {PRG~Basel} <RA...@Roche.COM> writes:

 
BR> but get an error like this:
 
BR> java.lang.NullPointerException at
BR> org.apache.batik.bridge.CSSUtilities.getComputedStyle(Unknown
BR> Source) at
    
    You are not setting the CSSEngine on the BridgeContext.

BR> The source that corresponds to this error comes from this method:
 
          String elementText =
aTextElement.getFirstChild().getNodeValue();
          log.debug("  the element's text: " + elementText);
          int textLength = elementText.length();
 
       // Given the Element representing the current line of sequence,
find it's x0,y0 and height & width using GVT methods.
          Element overlayRect = doc.createElementNS(svgNS, "rect");
          GVTBuilder builder = new GVTBuilder();
          BridgeContext ctx = new BridgeContext(new UserAgentAdapter());
          GraphicsNode aTextElementNode = builder.build(ctx,
aTextElement);
          double width = aTextElementNode.getBounds().getWidth();
          double height =  aTextElementNode.getBounds().getHeight();
          double x =  aTextElementNode.getBounds().getX();
          double y =  aTextElementNode.getBounds().getMinY();
(...code continues)
 
BR>   I thought of and tried to test for various things like maybe
BR> there wasn't a big enough Frame or JSVGCanvas or something funny
BR> was happening with the timing of the JSVGCanvas creation, but
BR> haven't had an luck.  I suspect it has something to do with the
BR> BridgeContext or maybe UserAgent, but don't really know.
 
BR> Any ideas would be appreciated.
 
 You could provide a CSSEngine but I wonder why you are bothering to
build this second SVG tree?  Why not just query the tree you already
have?

        BridgeContext context = /* get the BridgeContext used to build
                                   gvt tree possibly by subclassing
                                   JSVGCanvas */

        GraphicsNode aTextElementNode = context.getGraphicsNode(aTextElement);
        /*...*/


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