Hi Antti, Antti wrote on 06/28/2007 04:20:26 AM:
> On Thu, 28 Jun 2007 04:24:24 +0300, <[EMAIL PROTECTED]> wrote: > > > Antti wrote on 06/27/2007 03:19:50 AM: > > > >> I have an svg image that I need to rotate (90 or -90 degrees) and > >> rasterize. What is the correct way to do this? > >> > >> I have the rasterizing (to png) already working using the transcoder > >> API. Is it possible to do the rotation at the same time, i.e. use some > >> transcoding hint for this? > > > > There isn't currently a transcoding hint for this. > > Should I file an enhancement request? Well, you can always file one, but it's a pretty specific request that as I already detailed has 3 ways of being done. > > It could be done using an SVG Fragment Identifier: > > http://www.w3.org/TR/SVG11/linking.html#SVGFragmentIdentifiers > > This one looks a bit scary as I am not that familiar with the SVG > specification. I guess I'll have to dig into this if all else fails... This is actually the simplest (except for the translate/bounds problem). > > However, I would probably subclass the Transcoder to adjust the > > 'curTxf' member to include the desired transform. > > I tried this, but I must be missing something here. I made a simple > subclass: > But it turns out setting curTxf field this way in the constructor is > useless. When calling transcode method, the following lines in > SVGAbstractTranscoder reset the curTxf field (lines 266-271 in batik 1.6 > sources): > I could not figure out a way to get to modify curTxf during transcoding > after the above executes, short of modifying batik sources. = / Did I miss > something? class RotatingPNGTranscoder extends PNGTranscoder { protected void transcode(Document document, String uri, TranscoderOutput output) { super.transcode(document, uri, output); AffineTransform transform = AffineTransform.getRotateInstance( theta ); if ( this.curTxf != null ) { this.curTxf.concatenate( transform ) ; } else this.curTxf = transform ; } > > You could do this be building a small SVG document dynamically that > > used > > the 'image' element to pull in the 'real' SVG document. Then you can use > > the transform attribute on the image element to rotate things. > > Do you mean something like this: > > String parser = > XMLResourceDescriptor.getXMLParserClassName() ; > SAXSVGDocumentFactory factory = new SAXSVGDocumentFactory( parser ) ; > Document temp = > factory.createDocument( SVGDOMImplementation.SVG_NAMESPACE_URI ) ; > > But where to from here? SVGGraphics2D has methods for drawing Images, > but how do I get from Document to image (i.e. the svg I have is as a > Document object)? I ment use standard DOM methods to construct the elements. Element img = temp.createElementNS("http://www.w3.org/2000/svg";, "image"); img.setAttributeNS("http://www.w3.org/1999/xlink";, "xlink:href", "foo.svg"); img.setAttributeNS(null, "transform", "rotate(90)"); [....] temp.getRootElement.appendChild(img); > > The tricky bits of all this is that when you rotate you typically need > > to add a translate to move the document (or provide a viewBox) and that > > depends on the dimensions of the image in question. If you subclass the > > Transcoder this information is fairly readily available. > > Well, I'll worry about that once I get some rotation happening at all... Good luck! --------------------------------------------------------------------- To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
