Re: How to use an already existing DOM Document for generating Images.

[Stephane Hillion <St...@sophia.inria.fr>]

Davanum Srinivas wrote:

> Am trying to use the Transcoder to generate a JPG (In Cocoon2). My problem is according to the
> javadocs the first param in transcodeToStream can be a org.w3c.dom.Document, But trasncodeToStream
> throws an Class Cast Exception as it is trying to cast it to a SVGDocument. Now the question is
> what is the "correct" way to pass my own org.w3c.dom.Document to the Transcoder???
>
>    TranscoderFactory factory =
>        ConcreteTranscoderFactory.getTranscoderFactoryImplementation();
>    Transcoder transcoder = factory.createTranscoder("image/jpg");
>    transcoder.transcodeToStream(doc, this.output);
>

The transcoder needs a SVGDocument instance, so you have two solutions:
    - you can create and manipulate a SVGDocument while you generate the original document in your
application (before using the transcoder).  This should be easy to do if you create your documents in
a 'standard' way, ie:

    DOMImplementation domImpl = SVGDOMImplementation.getDOMImplementation();
    SVGDocument document = domImpl.createDocument(SVGDOMImplementation.SVG_NAMESPACE_URI, "svg",
null);
    // then use the document factory methods.

    - else, you can recursively transform the original document into a SVGDocument. Easy too.
--
    Stephane.