Hi Nazar,
"Nazar Stasiv (Lohika, Inc)" <[EMAIL PROTECTED]> wrote on 08/14/2006
11:54:58 AM:
> the only difference is that I need SVGRect from different element, not
> the rootGN. Like next:
This should not be a problem. The only thing I can comment on
is that you are dropping references to a lot of objects that
need to be alive for the SVG DOM to work (in particular the
BridgeContext and the rootGN). I would think that until you
called BridgeContext.dispose() the DOM tree would be sufficient
to keep everything alive but in particular you may need to
hold a reference to the rootGN.
I would do three things:
1) try calling getBBox on the root SVG element in the
parseSVG method (to see if this is working at all
for you).
2) If #1 works try getBBox in the parseSVG method for
one (or more) of the Element's you want.
3) If #2 works then hold the reference and see if it
works later.
Also it's worth noting that if an element isn't rendered
(in a defs, has "display" set to "none", etc) then it won't
have a bbox.
> public static SVGDocument parseSvg(String uri) {
> UserAgent userAgent = new UserAgentAdapter();
> DocumentLoader loader = new DocumentLoader(userAgent);
> SVGDocument doc;
> try {
> doc = (SVGDocument) loader.loadDocument(uri);
> } catch (Exception e) {
> e.printStackTrace();
> throw new RuntimeException(e);
> }
> BridgeContext ctx = new BridgeContext(userAgent, loader);
> ctx.setDynamicState(BridgeContext.DYNAMIC);
> GVTBuilder builder = new GVTBuilder();
> GraphicsNode rootGN = builder.build(ctx, doc);
> loader.dispose();
> return doc;
> }
>
> //this will return null.
> public static SVGRect getSVGRect(SVGLocatable e) {
> return e.getBBox();
> }
>
> [EMAIL PROTECTED] wrote:
> > Hi Nazar,
> >
> > "Nazar Stasiv (Lohika, Inc)" <[EMAIL PROTECTED]> wrote on 08/14/2006
> > 09:55:27 AM:
> >
> >
> >> No I don't use JSVGCanvas. My application is using servlets.
Basically I
> >>
> >
> >
> >> construct SVGDocument from file and while visiting elements of its
DOM
> >> tree I need a coordinate of the element for later use
> >>
> >> To boot SVG DOM you mean a code like this ?
> >>
> >
> > Close but for correct results you need to build it from the root
> > of the SVG tree (just like the Wiki page). You should also only do
> > this once for the whole document right after loading it (not for
> > each element).
> >
> >
> >> public static Rectangle2D getBounds2D(Element e) {
> >> 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, e);
> >> return rootGN.getBounds();
> >>
> >> }
> >> Note: when visiting an element it is already of type SVGOMGElement,
> >> hence there no need to boot SVG DOM or am I wrong?
> >>
> >
> > You need to boot the SVG DOM in all cases, if you want to use it.
> >
> >
> >> If you look at my code at line last but one, rootGN =
builder.build(ctx,
> >>
> >
> >
> >> e); it assigns null to rootGN.
> >>
> >
> > Right you need to build from root of Document.
> >
> >
> >>
> >> [EMAIL PROTECTED] wrote:
> >>
> >>> Hi Nazar,
> >>>
> >>> "Nazar Stasiv (Lohika, Inc)" <[EMAIL PROTECTED]> wrote on
08/14/2006
> >>> 09:16:01 AM:
> >>>
> >>>
> >>>
> >>>> SVGLocatable.getBBox(elem) returns null No javadoc comments are
there
> >>>>
> > to
> >
> >>>
> >>>> unveil the reason of such behaviour
> >>>>
> >>>> Is there the other way to get coordinates of SVGOMGElement ?
> >>>>
> >>>>
> >>> How are you using the Document? Is it in the JSVGCanvas?
> >>> Are you trying to call this method before loading the document?
> >>>
> >>> For these methods to work you need to boot the SVG DOM.
> >>> This normally happens when you load the document in the Canvas
> >>> (you may need to set document state to ALWAYS_DYNAMIC on the
> >>> canvas before loading the document if there are no obvious dynamic
> >>> features of the document).
> >>>
> >>> If you are trying to use these features outside of the
> >>> JSVGCanvas check the Batik wiki for how to bring up the SVG DOM:
> >>>
> >>> http://wiki.apache.org/xmlgraphics-batik/BootSvgAndCssDom
> >>>
> >>>
> >>>
> >>>> [EMAIL PROTECTED] wrote:
> >>>>
> >>>>
> >>>>> Hi Nazer,
> >>>>>
> >>>>> "Nazar Stasiv (Lohika, Inc)" <[EMAIL PROTECTED]> wrote on
> >>>>>
> > 08/14/2006
> >
> >>>>> 07:29:19 AM:
> >>>>>
> >>>>>
> >>>>>
> >>>>>
> >>>>>> I use batik to operate SVG at runtime.
> >>>>>>
> >>>>>> The question is how can I get SVGOMGElement coordinates when
> >>>>>>
> > walking
> >
> >>> DOM
> >>>
> >>>
> >>>>>> tree of the SVG document?
> >>>>>>
> >>>>>>
> >>>>>>
> >>>>> You should look at the SVG DOM. In particular the 'getBBox'
> >>>>>
> >>>>>
> >>> method.
> >>>
> >>>
> >>>>> There are also methods get 'getIntersectionList' that could be
> >>>>>
> > useful.
> >
> >>>>>
> >>>>>
> >>>>>
> >>>>>> The reason I'm asking such a thing it that requirements are to
> >>>>>>
> >>>>>>
> >>> display
> >>>
> >>>
> >>>>>> info popup near named elements of SVG. If I had coordinates of
such
> >>>>>>
> >
> >
> >>> an
> >>>
> >>>
> >>>>>> element I could use DOM to add new element to the tree with
> >>>>>>
> > computed
> >
> >>>>>> coordinates for correct positioning of the info popup.
> >>>>>>
> >>>>>>
> >>>>>>
> >>>>> This is typically done with mouse over/out event handlers. This
> >>>>> allows you to receive a DOM event when the mouse enters/exits a
> >>>>>
> >>>>>
> >>> particular
> >>>
> >>>
> >>>>> element or group in the SVG document. If you need the sensitive
> >>>>>
> > area
> >
> >>> to
> >>>
> >>>
> >>>>> be larger than the rendered area you can add a hidden element
> >>>>> (visibility="hidden" pointer-events="fill") that can cover the
> >>>>>
> >>>>>
> >>> expanded
> >>>
> >>>
> >>>>> area and tie your event handler to that.
> >>>>>
> >>>>>
> >>>>>
> >>>>>
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