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From rm <ruben.malc...@googlemail.com>
Subject keeping DOM and Graphics in sync
Date Thu, 18 Oct 2012 04:23:49 GMT


hello list,

i am having difficulties grasping the relationship between the SvgBuilder and the DOM tree.
for the 
task i am trying to implement, an svg document would travel along a pipeline with several
steps,
each step adding stuff to it. 

the things added are nodes copied from other svgs, but they also need to be transformed, so
the
initial approach was to create an empty SVG and boot it, then pass it along with it's bridge
context,
graphics node and svg graphics 2d through this pipeline, the each step could use regular DOM

methods to clone elements from other SVGs into the current one, then use SVG specific versions

of the elements to do transforms etc.

the problem occurs when i try to get the SVG node associated with the "dom version" of it
- i can get
a node of the correct type, but i cannot get it's BBox. below is the code i am using and it's
output.

a sidenote: what's the best way to make sure that all drawing operations on SVGGraphics2D
are 
reflected in the DOM? obviously, i could do stream() and then parse the output again … but
that
seems like a rather expensive way to do that … 

any suggestions? what am i missing?

thanks!

.rm


---------------------------------------------------------------------------------------------------------------------------------------------------



			DOMImplementation domImpl = new SVGDOMImplementation();
			SVGDocument svg = (SVGDocument) domImpl.createDocument(
					SvgNamespaceContext.SVG_NS_URI,
					SvgNamespaceContext.SVG_NS_PREFIX, null);

			SVGGraphics2D graphics = new SVGGraphics2D(svg);
			UserAgent 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, svg);

			System.err.println("===> A");

			// does not work:
			graphics.drawRect(10,10,200,300);
			Document d = ctx.getDocument();
			ctx.get
			System.err.println();
			XmlUtil.transform(ctx.getDocument(), System.err);
			System.err.println();

			System.err.println("===> B");
			
			Element n = ctx.getDocument().createElementNS(SvgNamespaceContext.SVG_NS_URI,"rect");
			SvgUtil.setSvgAttribute(n, "id", "test-circle");
			SvgUtil.setSvgAttribute(n, "x", 2);
			SvgUtil.setSvgAttribute(n, "y", 30);
			SvgUtil.setSvgAttribute(n, "width", 200);
			SvgUtil.setSvgAttribute(n, "height", 100);
			SvgUtil.setSvgAttribute(n, "style", "fill:#ff0000;fill-rule:evenodd;stroke:#000000;stroke-width:1px;stroke-linecap:butt;stroke-linejoin:miter;stroke-opacity:1");
			ctx.getDocument().getDocumentElement().appendChild(n);
			System.err.println();
			XmlUtil.transform(ctx.getDocument(), System.err);
			System.err.println();
			
			
			System.err.println("===> C: ");
			Node n2 = graphics.getRoot(n);
			System.err.println();
			System.err.println(" ========> "+n2);
			System.err.println(" ========> "+((SVGLocatable )n2).getBBox());
			System.err.println();


---------------------------------------------------------------------------------------------------------------------------------------------------

and the output is as follows:


===> A

<?xml version="1.0" encoding="UTF-8"?>
<svg xmlns:xlink="http://www.w3.org/1999/xlink" xmlns="http://www.w3.org/2000/svg"
	contentScriptType="text/ecmascript" zoomAndPan="magnify"
	contentStyleType="text/css" preserveAspectRatio="xMidYMid meet"
	version="1.0" />
===> B

<?xml version="1.0" encoding="UTF-8"?>
<svg xmlns:xlink="http://www.w3.org/1999/xlink" xmlns="http://www.w3.org/2000/svg"
	contentScriptType="text/ecmascript" zoomAndPan="magnify"
	contentStyleType="text/css" preserveAspectRatio="xMidYMid meet"
	version="1.0">
	<rect y="30"
		style="fill:#ff0000;fill-rule:evenodd;stroke:#000000;stroke-width:1px;stroke-linecap:butt;stroke-linejoin:miter;stroke-opacity:1"
		x="2" id="test-circle" width="200" height="100" />
</svg>

===> C: 

 ========> org.apache.batik.dom.svg.SVGOMRectElement@3c3a1834
	    ^^^ this is actually exactly what i expect
 ========> null
	    ^^^ this is not quite what i want … 
 




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