Hi Brendon,
"Brendon J. Wilson" <[email protected]> wrote on 12/14/2009
09:16:07 PM:
> Interesting, so I've taken your advice but it appears the
> SVGTextPositioningElement.getExtentOfChar method throws a
> NullPointerException [...].
> Is there some other initialization I need to do before
> I attempt to use this method?
Yes you must boot the SVG & CSS DOM before you
try and use them:
http://wiki.apache.org/xmlgraphics-batik/BootSvgAndCssDom
> // Open the SVG template.
> String parser = XMLResourceDescriptor.getXMLParserClassName();
> SAXSVGDocumentFactory f = new SAXSVGDocumentFactory(parser);
> SVGDocument doc = f.createSVGDocument(new
File("test.svg").toURI().toString());
Insert the Initialization code here...
> Element testElement = doc.getElementById("test");
> SVGTextPositioningElement positioning =
(SVGTextPositioningElement)
> testElement;
> SVGRect testBounds = positioning.getExtentOfChar(3);
>
>
> if (testBounds != null)
> {
> System.out.println("No overflow!");
> }
> else
> {
> System.out.println("Overflow!");
> }
> }
> catch (IOException ex)
> {
> System.out.println("Unable to read the template SVG file!");
> }
> }
> }
>
> ---
>
> Thanks in advance,
>
> Brendon
>
>
> On Dec 14, 2009, at 5:30 AM, [email protected] wrote:
>
> > Hi Brendon,
> >
> > "Brendon J. Wilson" <[email protected]> wrote on 12/13/2009
> > 11:24:25 PM:
> >
> > > The Desired Result: An area of text that uses the largest font size
> > > possible while still fitting into a given rectangle.
> > >
> > > The Proposed Solution: Use the 'flowroot' element, check for
> > overflow,
> > > and iteratively adjust the font size of the text.
> > >
> > > The Problem: Based on emails from this list dating from 2006, it
> > does
> > > not appear overflow events are implemented, and my alternative
> > > attempts to formulate my own overflow detection mechanism have been
> > > unsuccessful.
> >
> > I haven't checked the recently but my recollection is that there
> > were some issues with the way those events were specified that made
> > it problematic to implement them.
> >
> >
> > > but a similar call to attempt to get the bounding box for the laid
> > out
> > > text (I presume, I'm actually shooting in the dark at this point)
> > > results in an uncaught exception:
> > >
> > > ---
> > > SVGElement svgElement = (SVGElement) doc.getElementById("title");
> > > SVGLocatable locatable = (SVGLocatable) svgElement;
> > > SVGRect altbounds = locatable.getBBox();
> >
> > The problem is that the flowDiv/flowPara/flowSpan implement the
> > SVG Text positioning interface rather than SVG Locatable. You should
> > be able to detect overflow by checking if the 'getExtentOfChar' for
> > the last 'printing char' is empty (i.e. the flow text hid it).
> >
> > > Is there another, easier way to figure out the actual dimensions of
> > > the laid out text in a flowDiv, or check the flowRoot for
> > overflow? Or
> > > are overflow events still not implemented?
> >
> > The layout code actually tracks if overflow occurs but it isn't
> > exposed anywhere. In 'FlowTextPainter.getTextRuns' the 'textWrap'
> > function called at the end returns true if there was overflow, but
> > that return value is propagated anywhere.
> >
>
> Thanks,
>
> Brendon
> ---
> Brendon J. Wilson
> www.brendonwilson.com
>
>
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