Vladimir Bulatov wrote:
Hello everybody, We are using Batik for writing accessible SVG viewer to be used by blind computer users to access to graphical information. We use special tactile graphics printer as output device and special touch screen as input device and replacement for a mouse. This is just some background info to explain, that we may have unusual requirements.
The problem we currently have with Batik is to find a way to print text in a custom way. Text for blind users should be printed in a special way. Most popular is Braille code, when every character is represented by combination of dots on 2 by 3 or 2 by 4 matrix with 1/10 inch distance between dots. This size roughly corresponds to 29 or 36 points font size. Other ways to represent text are possible depending on characters size. But, in any case, tactile representation should be very much different from visual representation.
We need an advise on the best way to customize Batik to allow special text rendering. Visual representation should remain the same to be useful for sighted user. Only printed copy should be different. Ideally we would like to be to have the ability to pass text strings directly to printer driver (we are on windows platform and have quite sophisticated driver, which converts text into Braille itself), bypassing Batik rasterizer.
I'm not sure I fully understand what you mean by 'pass text strings directly to print driver'. This is Java we never talk to something as low level as a driver. We do talk to Java's implementation of Graphics2D for Print. _Most_ of our text is drawn using 'drawGlyphVector' in cases where the text is stroked, or based on an SVG Font we may draw shapes to the Graphics2D.
If you want to 'reimplement' text most of the work is done by the SVGTextElementBridge in the org.apache.batik.bridge package. However if all you want to do is extract the text from the document I wouldn't bother with Batik I would just use a little XSLT - so I imagine you want something more than just "text strings".
That all said my initial response on how to modify output for braille would be to use something like a user style sheet, with an '@media braille' rule. The Batik browser allows you to set the CSS Media in use for display.
Any advice would be appreciated.
All the best, Vladimir Bulatov
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