FOP 0.90 help for fo:instream-foreign-object

[Debasish Jana <de...@anshinsoft.com>]

Hi:

I was trying to use fop 0.90 alpha for PDF rendering from a XSL:FO document.

But, I don't have any clue how to render fo:instream-foreign-object.
Suppose, I would like to render a chart using own chart drawing algorithm
and want to Hook up with the fop renderer as an extension to fo.
 
Can you pass some pointer ro link with some code examples to do that?

An early reply in this regard would be greatly appreciated.

Warm regards,
Debasish Jana


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Re: FOP 0.90 help for fo:instream-foreign-object

[Jeremias Maerki <de...@jeremias-maerki.ch>]

Apache FOP supports an extension mechanism to handle arbitrary XML
namespaces in fo:instream-foreign-object. First of all, I'd upgrade to
at least the latest release (0.91beta) or even FOP Trunk (the latest
source code in the Subversion repository). There are several examples of
extension implementations for instream-foreign-objects. Here's a list:

- SVG extension: in the package org.apache.fop.fo.extension.svg in
src/java
- MathML extension: in examples/mathml
- Plan extension: in examples/plan
- Barcode4J (barcode generator): http://barcode4j.krysalis.org

The best and simplest example in your case is probably the plan
extension. It defines an arbitrary XML dialect and converts it to SVG
internally. After that, FOP will simply use Batik to render the SVG
document to the target format. Barcode4J is a good example of an
advanced extension which provides native rendering capabilities, for
example directly using a Graphics2D interface. Note that you'll need FOP
Trunk for the latter to work. The SVG approach works with 0.91beta or
later.

Key points for such an extension:
- An ElementMapping descendant which tells FOP which namespace and
elements are supported.
- XMLObj descendants which represent the elements in the foreign
namespace.
- The JAR which will contain your extension will have to contain a file
called "org.apache.fop.fo.ElementMapping" in the META-INF/services
directory. Its contents is the fully qualified classname of the
ElementMapping descendant.

Good luck.

On 09.03.2006 05:24:14 Debasish Jana wrote:
> Hi:
> 
> I was trying to use fop 0.90 alpha for PDF rendering from a XSL:FO document.
> 
> But, I don't have any clue how to render fo:instream-foreign-object.
> Suppose, I would like to render a chart using own chart drawing algorithm
> and want to Hook up with the fop renderer as an extension to fo.
>  
> Can you pass some pointer ro link with some code examples to do that?
> 
> An early reply in this regard would be greatly appreciated.
> 
> Warm regards,
> Debasish Jana


Jeremias Maerki


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