I've also come across a similar scenario where by a text element containing
just space causes an exception when I attempt to calculate the bounding box.
For my situation such text elements with spaces can be ignored so I just do
a check to avoid the exception.
For you I would suggest looking into the SVG specification or SVG CSS
specification as there may be ways in which the length of a space can be
derived by calculations based on style sheet values. For example, there is
and attribute called horiz-adv-x which might give you a clue to how wide a
space should be. The height doesn't matter - you could derive this from the
height of the rest of the text.
So I would suggest removing trailing spaces (but keeping a record of them in
a String) to avoid the exception you get from batik. Do your calculation to
get the rectangle. The query your document's CSS values to work out the size
of a space and multiply this by the number of spaces in that String and add
this to the rectangle dimensions.
madprog wrote:
>
> Hello,
>
> I am having a problem with the SVGOMTextElement.getSubStringLength
> method.
> In the following code, this.selectMask is a SVGOMRectElement and
> this.text a SVGOMTextElement.
> It tries to set the width of the <rect> element to the length of the
> text showed in the <text> element.
>
> 1: try {
> 2: this.selectMask.setAttribute("width",
> Float.toString(this.text.getSubStringLength(start, length)));
> 3: } catch (NullPointerException npe) {
> 4: System.out.println("selection: '" +
> this.text.getTextContent().substring(start, start + length) + "'");
> 5: npe.printStackTrace();
> 6: }
>
> The output is following:
>
> selection: 'Hello, '
> java.lang.NullPointerException
> at
> org
> .apache
> .batik
> .bridge
> .SVGTextElementBridge.getSubStringLength(SVGTextElementBridge.java:2723)
> at
> org
> .apache
> .batik
> .bridge
> .SVGTextElementBridge.getSubStringLength(SVGTextElementBridge.java:2385)
> at
> org
> .apache
> .batik
> .dom
> .svg
> .SVGTextContentSupport.getSubStringLength(SVGTextContentSupport.java:
> 260)
> at
> org
> .apache
> .batik
> .dom
> .svg
> .SVGOMTextContentElement
> .getSubStringLength(SVGOMTextContentElement.java:195)
> at (attached source code, line 2)
> ...
>
> The exception is raised only when the substring is at the end of the
> text content, and when this content is ended by a space character (' ').
>
> Is this a bug ? If it is not, do I have to trim the substring, and get
> the length of this new string from the <text> element ?
> Is not there a way to have this space included in the calculation ?
>
> Paul
>
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