On Wed, Aug 3, 2011 at 1:03 PM, Mike Jarmy <[email protected]> wrote:
> I'm working with a custom widget toolkit that is built directly on top
> of java.awt -- in other words I'm not using Swing, or SWT, or anything
> other than a framework built on plain old AWT.
>
> I'd like to be able to render (and animate) SVG drawings directly onto
> a java.awt.Graphics2D instance. However, I'm having a bit of trouble
> figuring out how exactly to do that with batik. I *think* that I need
> to decode my SVG drawing into a GVT tree, and then render the tree.
> However I can't figure out which part of batik I need in order to do
> the rendering. Transcoder and SVGGraphics2D do not seem to be quite
> what I want. Actually, I haven't yet figured out the
> decoding-to-GVT-step either, but I'm assuming that's pretty
> straightforward.
>
> So can anyone give me a pointer on how to do this? Perhaps just point
> me to an existing example? My first goal is to just get static images
> rendering.
>
> After that, I'll need to get animation working. I'm assuming that
> supporting animation will entail updating the drawing's current time
> every so oftern on a separate thread, via the AnimationEngine, and
> then re-rendering the updated GVT?
>
> I *could* do all this by rendering into a static java.awt.Image, and
> then bliting the Image (i.e. roll my own double-buffering), but I'd
> prefer to figure out how to just draw directly onto a Graphics2D
> instance first. That's because the framework I'm using already has
> some double-buffering, so I most likely wont need to do that with the
> SVG rendering.
>
> Thanks,
> Mike Jarmy
>
> P.S. FYI, I'll probably never need to support handling interactive user input.
>
OK, I have discovered the GraphicsNode.paint(Graphics2D g2d) method,
which may be all I need to call once I actually get a valid GVT build.
However, I'm having trouble building a GVT from a
java.io.InputStream. Here is the code I'm using:
String parser = XMLResourceDescriptor.getXMLParserClassName();
SAXSVGDocumentFactory f = new SAXSVGDocumentFactory(parser);
// String uri = "http://www.example.org/document.svg";;
Document document = f.createDocument(null, inputStream);
UserAgent userAgent = new UserAgentAdapter();
DocumentLoader loader = new DocumentLoader(userAgent);
BridgeContext bctx = new BridgeContext(userAgent, loader);
bctx.setDynamicState( BridgeContext.DYNAMIC );
GVTBuilder builder = new GVTBuilder();
this.gvtRoot = builder.build(bctx, document);
This code fails at the call to GVTBuilder.build(), with the following error:
Invalid CSS document.
Unable to make sense of URL for connection
at
org.apache.batik.css.engine.CSSEngine.parseStyleSheet(CSSEngine.java:1149)
at
org.apache.batik.dom.svg.SVGDOMImplementation.createCSSEngine(SVGDOMImplementation.java:117)
at
org.apache.batik.dom.ExtensibleDOMImplementation.createCSSEngine(ExtensibleDOMImplementation.java:212)
at
org.apache.batik.bridge.BridgeContext.initializeDocument(BridgeContext.java:378)
at org.apache.batik.bridge.GVTBuilder.build(GVTBuilder.java:55)
at com.tridium.svg.ui.BSvgDrawing.loadDrawing(BSvgDrawing.java:305)
Could that be because I'm passing a null value in for the URI when I
create the document from the InputStream? I have noticed that I get
the same error no matter what I pass in for the URI. Is there perhaps
a better way to construct a Document from an InputStream?
Thanks,
Mike Jarmy
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