I may not understand the details of what you are trying to achieve -
but I am assuming that you have an SVG file (that you don't control),
you want to rotate the image by some arbitrary amount, and transcode
the rotated image as a PNG? Putting to one side the problem of working
out the size of the output image, I would create my own SVG as
follows:
<svg ...>
<g transform="rotate(45, <x>, <y>)">
<svg>Imported SVG file</svg>
</g>
</svg>
Obviously, the dimensions of the outer SVG document must be at least
as large as the bounding box of the rotated inner document.
HTH
Martin
On 12 August 2010 10:13, Tiago Matias <tiagomat...@psiengine.com> wrote:
> Just a small update. I managed to obtain the dimensions of the SVG file
> using this bit of code:
>
> UserAgentAdapter userAgent = new UserAgentAdapter();
> DocumentLoader loader = new DocumentLoader(userAgent);
> BridgeContext ctx = new BridgeContext(userAgent, loader);
> ctx.setDynamicState(BridgeContext.DYNAMIC);
> GVTBuilder builder = new GVTBuilder();
> GraphicsNode rootGN = builder.build(ctx, svgDocument);
>
> Rectangle2D bounds = rootGN.getBounds();
>
> So only one question remains: how to apply a transformation to the
> SVGGraphics2D and get the result back (or update the original SVGDocument
> DOM)?
>
> Thanks once again!
>
> Tiago Matias
>
> ________________________________
> From: Tiago Matias
> Sent: Wednesday, August 11, 2010 2:16 PM
> To: batik-users@xmlgraphics.apache.org
> Subject: Rotating an existing SVG document
>
> Hello all,
>
>
>
> I'm sorry for asking this question once more, but I'm really having trouble
> rotating an existing SVG document.
>
>
>
> The purpose is to load an SVG file, rotate it about the centerpoint and then
> transcode it.
>
>
>
> I got the process sort of working except for the rotation.
>
>
>
> Here's the code (questions below)
>
>
>
> private final SVGDocument svgDocument;
>
>
>
> // Load the SVG file.
>
> SAXSVGDocumentFactory factory = new
> SAXSVGDocumentFactory(SAXParser.class.getCanonicalName());
>
> svgDocument = (SVGDocument)
> factory.createDocument(url.toString());
>
>
>
> SVGGraphics2D engine = new SVGGraphics2D(svgDocument);
>
>
>
> // 90º rotation
>
> engine.rotate(Math.Pi / 2);
>
>
>
> Element root = svgDocument.getDocumentElement();
>
> root.appendChild(engine.getRoot());
>
>
>
> // Transcode.
>
> PNGTranscoder trans = new PNGTranscoder();
>
>
>
> ByteArrayOutputStream outputStream = new
> ByteArrayOutputStream(2048);
>
> trans.transcode(new TranscoderInput(svgDocument), new
> TranscoderOutput(outputStream));
>
>
>
> My questions are:
>
> 1) If I invoke a engine.stream() I get an empty document. It
> just contains (roughly) <SVG><G/></SVG> (plus a defs element and some
> styling attributes).
>
> 2) To proper rotate the document I'd need to translat it to
> the origin. Thing is, how may I obtain the dimensions and height of the
> canvas? I tried engine.getDimension() but it returns null.
>
>
>
> Additionally, the output of this bit of code is the original file transcoded
> to PNG. Which means that the original svgDocument was not changed (with or
> without rotation).
>
>
>
> Any help would be greatly appreciated.
>
>
>
> Best retards,
>
>
>
> Tiago Matias
>
>
>
>
--
>From my MacBook Pro
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