Hi Eugen Assuming you're using Apache FOP 1.0 or later, I would suggest to you to write a set of plug-ins for the Apache XML Graphics Commons image loader framework. The documentation for that is found here: http://xmlgraphics.apache.org/commons/image-loader.html
That's our new infrastructure for handling images. And your charting XML is nothing other than an image in XML. A good example of such a set of plug-ins can be found in Barcode4J: http://barcode4j.cvs.sourceforge.net/viewvc/barcode4j/barcode4j/src/xmlgraphics-commons/ You can see multiple ImageConverter implementations there. One converts [1] a generic XML document into an ImageBarcode [2]. And you would create something like an ImageChart. Furthermore, I'd go the Java2D route (Graphics2D), so you'd add an ImageConverter which takes an ImageChart and produces an ImageGraphics2D [3] (The code in there basically paints your chart against a Graphics2D object). The latter can be processed by FOP's PDF support to create high-quality vector graphics without you having to learn about PDF specifics. The nice side-effect is that it won't only work for PDF, but also for all other output formats supported by FOP. [1] http://barcode4j.cvs.sourceforge.net/viewvc/barcode4j/barcode4j/src/xmlgraphics-commons/java/org/krysalis/barcode4j/image/loader/ImageConverterBarcodeXML2Barcode.java?view=markup [2] http://barcode4j.cvs.sourceforge.net/viewvc/barcode4j/barcode4j/src/xmlgraphics-commons/java/org/krysalis/barcode4j/image/loader/ImageBarcode.java?view=markup [3] http://barcode4j.cvs.sourceforge.net/viewvc/barcode4j/barcode4j/src/xmlgraphics-commons/java/org/krysalis/barcode4j/image/loader/ImageConverterBarcode2G2D.java?view=markup If you don't plan to put charts in external files (i.e. you use only fo:instream-foreign-object), you can omit the Preloader, LoaderFactory and Loader, I think. The image converters should be enough. If there's something that our PDFGraphics2D can't handle, we can take a closer look at this again. HTH On 03.01.2011 16:55:32 gen1986 wrote: > > Hi, > > I'm working on a project where I have to extend FO to support custom tags > for drawing charts. > For doing so I've extended ElementMapping and created my custom > ContentHandlerFactory, etc. > Until here it's ok. I can get all the infos about the chart from the xsl-fo > template. > > My problem is that I want now to write the chart as a stream to the PDF, but > I don't know which fop classes to use for doing it the right way. Any help > is welcome. > > If my problem isn't clear enough I can give more explanations, just let me > know ;) > > Thanks, > > Eugen > -- > View this message in context: > http://old.nabble.com/how-to-extend-the-rendering-part-of-fop-tp30579066p30579066.html > Sent from the FOP - Users mailing list archive at Nabble.com. Jeremias Maerki --------------------------------------------------------------------- To unsubscribe, e-mail: fop-users-unsubscr...@xmlgraphics.apache.org For additional commands, e-mail: fop-users-h...@xmlgraphics.apache.org
