Wow, thanks. This is exactly what I need.
Glen
On Fri, 25 Feb 2005 14:47:45 -0500, Andres Toussaint
<[EMAIL PROTECTED]> wrote:
> The best option is to render the image in a JSVGComponent, and once it
> is available, encode it as a PNG.
>
> The basic idea is to intercept the gvtRenderingCompleted event to
> recover the BufferedImage, and then encode this image to something your
> Cocoa App can handle, like a PNG.
>
> If your source is from a URL, simply take the JSVGCanvas tutorial on
> the Batik page as a guideline and change the JSVGCanvas to a
> JSVGComponent, also, you do not need a Swing component, nor do you need
> to add the JSVGComponent to any window for it to render the image. And
> once the gvtRenderingCompleted is called you can recover your image.
>
> I use this method for a JavaClient WebObjects app in Macintosh
> (although i only show the BufferedImage in a Swing component, and add
> the PNG back to my SVG as a thumbnail), so i am sure that it works on
> Max OS X.
>
> From a previous mail, that did not made it into the archives:
>
> Basically, you need to create a JSVGComponent (you do not need a
> JSVGCanvas since you are displaying in a AWT) and add the build and
> render listeners, so you are notified when the data is ready to be
> fetched. The important one is GVTRenderListener. When the image is
> fully rendered into a BufferedImage, a GVTRenderingCompleted is
> triggered and you can fetch the image directly from the Event.
>
> Once the listeners are in place, you need to load the document to your
> JSVGComponent, you can do so from a String (probably recuperated from a
> Database), from the filesystem, or from a prebuild org.w3c.dom.Document
> object. Once you assign the document to the JSVGComponent, simply wait
> until the event is triggered, and that is it.
>
> Here is an abstract on how to do it.
>
> ---------------Start of code
> svg = new JSVGComponent();
> svg.addSVGDocumentLoaderListener(new
> SVGDocumentLoaderAdapter() {
> public void
> documentLoadingStarted(SVGDocumentLoaderEvent e) {
> }
> public void
> documentLoadingCompleted(SVGDocumentLoaderEvent e) {
> //System.out.println("SaveAsDXF-ExportCache
> succesfully loaded");
> }
> });
> svg.addGVTTreeBuilderListener(new GVTTreeBuilderAdapter() {
> public void gvtBuildStarted(GVTTreeBuilderEvent e) {
>
> //System.out.println("SaveAsDXF-ExportCache-GVTBuilder Starting.....");
> }
> public void gvtBuildCompleted(GVTTreeBuilderEvent
> event) {
>
> //////////////// If you want access to the G2D elements (generalPath,
> shapes, rectangles2D, you can
> //////////////// get the GVTTree in this place and walk through it. The
> GVTTree has all your SVG
> //////////////// converted into Graphics2D objects.
>
> }
> });
>
> svg.addGVTTreeRendererListener(new GVTTreeRendererAdapter() {
> public void gvtRenderingPrepare(GVTTreeRendererEvent e) {
> }
> public void gvtRenderingCompleted(GVTTreeRendererEvent e) {
> ////////////////////////////////////
> ////////////////////////////////////
> // In here you can access your image, once the JSVGComponent has loaded
> // the XMl and parsed it as SVG and into Graphics2D objects, and finally
> // painted them into a BufferedImage.
> ////////////////////////////////////
>
> BufferedImage e.getImage();
>
> }
> });
>
> //////////////////////////////////// And now, to load your XML into the
> JSVGComponent you need something like this:
> //////////////////////////////////// Please note that this example has
> it that the XML is already in memory in a String.
> //////////////////////////////////// But you can have a FileReader to
> read from the filesystem also.
> /////////////Or you can simply call the
> jsvgComponent.loadSVGDocument(String URL);
> try {
> String parser =
> XMLResourceDescriptor.getXMLParserClassName();
> SAXSVGDocumentFactory f = new
> SAXSVGDocumentFactory(parser);
> //////////data is the XML that defines the SVG. Usually a string.
> Document doc = f.createSVGDocument(null, new
> java.io.StringReader((String)data));
>
> ////////////"svg" is the JSVGComponent object.
> svg.setDocument(doc);
>
> } catch (IOException ex) {
> System.out.println("Error de svg."+ex);
> }
>
> //-------------------------end of code
>
> Also, code form a mail by Thomas de Wesse, also lost in oblivion, to
> encode the BufferedImame into a PNG:
> Encode it as a PNG and include it in the xlink:href using
> the data protocol. This is what the code below does (very
> indirectly).
>
> The code to do this more directly (take from
> batik.svggen.ImageHandlerBase64Encoder) is something like:
>
> public static final String DATA_PROTOCOL_PNG_PREFIX =
> "data:image/png;base64,";;
>
> ByteArrayOutputStream os = new ByteArrayOutputStream();
> Base64EncoderStream b64Encoder = new Base64EncoderStream(os);
>
> ImageEncoder encoder = new PNGImageEncoder(b64Encoder, null);
> encoder.encode(buf);
>
> // Close the b64 encoder stream (terminates b64 streams).
> b64Encoder.close();
>
> String encodedPNGString = DATA_PROTOCOL_PNG_PREFIX + os.toString();
> ----------------End of code to encode as PNG
>
> On Feb 25, 2005, at 2:04 PM, Glen Simmons wrote:
>
> > I'm just getting started with Batik (and also with Java, somewhat) and
> > can't quite figure out where to start. I need to render an SVG and get
> > an image that I can display in the UI of my app. This is a Mac OS X
> > Cocoa app, so the JSVGCanvas component is not an option. Calling other
> > Java code is no problem, though.
>
> > From the architecture overview
> > (http://xml.apache.org/batik/architecture.html), it appears that I
> > need to drop down to the Renderer module. But I can't figure out how
> > to load an SVG file into it and get it to render. Is there some sample
> > code that shows how to do this?
> >
> > Thanks,
> > Glen Simmons
> >
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>
>
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