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Posted to batik-users@xmlgraphics.apache.org by "Nazar Stasiv (Lohika, Inc)" <ns...@lohika.com> on 2006/08/21 16:38:39 UTC
AffineTransform
Hello,
what I'm trying to do is to zoom SVG diagram in size. Is that the right
way ?
public static SVGDocument parseSvg(String uri) {
UserAgentAdapter userAgent = new UserAgentAdapter();
DocumentLoader loader = new DocumentLoader(userAgent);
SVGDocument doc = (SVGDocument) loader.loadDocument(uri);
BridgeContext ctx = new BridgeContext(userAgent, loader);
ctx.setDynamicState(BridgeContext.DYNAMIC);
GVTBuilder builder = new GVTBuilder();
GraphicsNode gvtRoot = builder.build(ctx, doc);
AffineTransform at = AffineTransform.getScaleInstance(0.5,
0.5);
gvtRoot.setTransform(at);
return doc;
}
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Re: AffineTransform
Posted by th...@kodak.com.
Hi Nazar,
"Nazar Stasiv (Lohika, Inc)" <ns...@lohika.com> wrote on 08/22/2006
06:49:43 AM:
> thomas.deweese@kodak.com wrote:
> >
> >
> > I would suggest looking at the code in
> > batik.transcoder.SVGAbstractTranscoder, in particular around the
> > call 'setViewingTransform'. This is in some sense the 'correct'
> > way to handle this.
> >
> I see transcode method which does setViewingTransform. And I've got two
> questions
> 1. transcode method is applied to every GraphicsNode in GVTTree or
> applying it to root node is enough?
Applying it to the root is enough.
> 2. setViewingTransform is the method of type CanvasGraphicsNode and I
> get a ClassCastException when casting GraphicsNode
Normally the CanvasGraphicNode is the first child of the
RootGraphicsNode.
See code from SVGAbstractTranscoder (two lines above setViewingTransform):
CanvasGraphicsNode cgn = getCanvasGraphicsNode(gvtRoot);
And the method that calls (9 lines after setViewingTransform):
protected CanvasGraphicsNode getCanvasGraphicsNode(GraphicsNode gn) {
if (!(gn instanceof CompositeGraphicsNode))
return null;
CompositeGraphicsNode cgn = (CompositeGraphicsNode)gn;
List children = cgn.getChildren();
if (children.size() == 0)
return null;
gn = (GraphicsNode)children.get(0);
if (!(gn instanceof CanvasGraphicsNode))
return null;
return (CanvasGraphicsNode)gn;
}
> Nothing happens for the code below, the condition is false
> if (gvtRoot instanceof CanvasGraphicsNode){
> ((CanvasGraphicsNode)gvtRoot).setViewingTransform(Px);
> }
>
>
> Nazar
>
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Re: AffineTransform
Posted by "Nazar Stasiv (Lohika, Inc)" <ns...@lohika.com>.
Hello Thomas,
see my comments inline
thomas.deweese@kodak.com wrote:
>
>
> I would suggest looking at the code in
> batik.transcoder.SVGAbstractTranscoder, in particular around the
> call 'setViewingTransform'. This is in some sense the 'correct'
> way to handle this.
>
I see transcode method which does setViewingTransform. And I've got two
questions
1. transcode method is applied to every GraphicsNode in GVTTree or
applying it to root node is enough?
2. setViewingTransform is the method of type CanvasGraphicsNode and I
get a ClassCastException when casting GraphicsNode
Nothing happens for the code below, the condition is false
if (gvtRoot instanceof CanvasGraphicsNode){
((CanvasGraphicsNode)gvtRoot).setViewingTransform(Px);
}
Nazar
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Re: AffineTransform
Posted by th...@kodak.com.
Hi Nazar,
"Nazar Stasiv (Lohika, Inc)" <ns...@lohika.com> wrote on 08/21/2006
10:38:39 AM:
> what I'm trying to do is to zoom SVG diagram in size. Is that the right
> way ?
I would suggest looking at the code in
batik.transcoder.SVGAbstractTranscoder, in particular around the
call 'setViewingTransform'. This is in some sense the 'correct'
way to handle this.
I suspect your way will work for many cases, but I think
certain SVG DOM calls will return wrong/misleading values
(things like getCTM/getScreenCTM).
> public static SVGDocument parseSvg(String uri) {
> UserAgentAdapter userAgent = new UserAgentAdapter();
> DocumentLoader loader = new DocumentLoader(userAgent);
> SVGDocument doc = (SVGDocument) loader.loadDocument(uri);
> BridgeContext ctx = new BridgeContext(userAgent, loader);
> ctx.setDynamicState(BridgeContext.DYNAMIC);
> GVTBuilder builder = new GVTBuilder();
> GraphicsNode gvtRoot = builder.build(ctx, doc);
> AffineTransform at = AffineTransform.getScaleInstance(0.5,
> 0.5);
> gvtRoot.setTransform(at);
> return doc;
> }
>
>
>
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