Hi Brendan,
Without a complete example of the code, I'm guessing a bit here.
I have found that when dealing with text and bounding boxes you must be
careful to never try to obtain the newly "added to the DOM" text's bounding
box in the same worker.
To summarize:
urq.invokeLater(new Runnable() {
public void run() {
Text t = document.createTextNode(text);
textNode.replaceChild(t, textNode.getFirstChild());
...
SVGRect altbounds = locatable.getBBox();
}
});
Would likely fail because the text has yet to be rendered (hence the size
has not been calculated?)
You can easily get around this using 2 worker threads in succession.
Perform the Locatable bounding box operation in the second one:
urq.invokeLater(new Runnable() {
public void run() {
Text t = document.createTextNode(text);
textNode.replaceChild(t, textNode.getFirstChild());
}
});
urq.invokeLater(new Runnable() {
public void run() {
...
SVGRect altbounds = locatable.getBBox();
}
});
If I've missed the mark, please try to provide some additional information.
On Sun, Dec 13, 2009 at 11:24 PM, Brendon J. Wilson <
[email protected]> wrote:
> After a couple hours of Googling and hacking, it would appear time to send
> an email to this list to see if there's a solution I'm missing.
>
> 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.
>
> The SVG:
> ---
> <?xml version="1.0" encoding="utf-8"?>
> <svg version="1.2" xmlns="http://www.w3.org/2000/svg"; x="0px" y="0px"
> width="982px" height="1200px" viewBox="0 0 982 1200">
>
> ...
>
> <flowRoot xml:space="preserve">
> <flowRegion vertical-align="middle">
> <rect x="74.472" y="376.98" width="833.958" height="296.985"
> id="bounding"/>
> </flowRegion>
>
> <flowDiv>
> <flowPara justification="middle" top-margin="10" left-margin="10"
> right-margin="10" bottom-margin="10" fill="#331C1D"
> font-family="'Futura-Medium'" font-size="72" id="title"><flowLine>Some
> interesting text</flowLine></flowPara>
> </flowDiv>
> </flowRoot>
> </svg>
> ---
>
> While this code allows me to get the rectangle into which I'm flowing text:
> ---
> SVGElement svgElement = (SVGElement) doc.getElementById("bounding");
> SVGLocatable locatable = (SVGLocatable) svgElement;
> SVGRect altbounds = locatable.getBBox();
> ---
>
> 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();
> ---
>
> Even if I move the id="title" to the flowDiv, the result is the same. So
> I'm at a bit of a loss.
>
> 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?
>
> Thanks in advance,
>
> Brendon
> ---
> Brendon J. Wilson
> www.brendonwilson.com
>
>
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