Re: Obtaining glyph bounding box

[James Shaw]

Thomas DeWeese wrote:
Hi James,
   To get back to your original question if all you want is the
bounding box of elements in the DOM, you can do this right with
the SVG DOM (svgelem.getBBox()).  The only advantage of this is
that you can using getElementById to avoid the need to walk the
whole tree.  Also using the SVG DOM you can even get the
location/size of individual glyphs from a text node.  Take a look
at:  samples/tests/spec/scripting/text_content.svg

This method looks promising, but I've failed to make it work.  A 
NullPointerException is raised when I do bbox.getX() (or any other 
method of SVGRect).
I think this is due to a null SVGContext.  Presumably some intermediate 
steps need to be taken before I can invoke the SVGRect methods.

My code looks like this:
Element textNode = doc.createElementNS(SVG_NS, "svg:text");
textNode.setAttributeNS(null, "font-family", "LilyPond-feta-20");
textNode.setAttributeNS(null, "font-size",   "18pt");
textNode.setAttributeNS(null, "x", "0");
textNode.setAttributeNS(null, "y", "0");
Element altGlyph = doc.createElementNS(SVG_NS, "svg:altGlyph");
altGlyph.setAttributeNS(XLINK_NS, "xlink:href", "#sixtyfourthrest");
altGlyph.appendChild(doc.createTextNode("?"));
textNode.appendChild(altGlyph);
doc.getDocumentElement().appendChild(textNode);
// not sure if the following two lines are needed
JSVGComponent svg = new JSVGComponent();
svg.setSVGDocument((SVGDocument)doc);
SVGRect bbox = ((SVGOMTextElement)textNode).getBBox();
System.out.println("MinX: " + bbox.getX());
Thanks
James Shaw
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