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Re: Pan and zoom navigation history

by thomas.deweese :: Rate this Message:

Hi Luc,

Luc_B <lucbard@...> wrote on 06/30/2009 03:43:57 PM: > I got it working except for one thing which is major for me. Let me explain. > All transformations such as zoom and pan are working fine with the history > now. > > My only problem is views. Whenever I set a new view via > canvas.setFragmentIdentifier("MyView"); > > It will be stored into the history but when I hit back it brings me back but > not at the same zoom level I was prior to calling setFragmentIdentifier.
This is because setting the fragment identifier clears the rendering
transform (this is done because in general the fragment identifier specifies
a viewbox). You may need to provide your own version of the setFragmentIdent
that incorporates the renderingTransform you want - in particular replace
the call to computeRenderingTransform such that initalTransform is replaced
with your desired history transform.

> I suspect I need in this case to store the ViewBoxTransform in history > instead of the RederingTransform
I don't think this is needed, you just need to install both.

> > But if so how can I distinguish between a regular interaction(zoom, pan) > and a setFragmentIdentifier call? > > Thanks again, > Luc > > thomas.deweese wrote: > > > > Hi Luc, > > > > Luc_B <lucbard@...> wrote on 06/29/2009 04:03:39 PM: > > > >> So I did my test by choosing the "Transform..." menu item. I did a bunch > > of > >> transforms and the next and previous menu item would never become > > enabled... > >> > >> This did not work until I clicked on the Stop button that I noticed was > >> enabled. Then all my transformations would trigger the > > gvtRenderingCompleted > >> event and therefor update the transformHistory object... > > > > Ok, I see the problem. It used to be that all rendering transform > > changes caused a gvtRenderingComplete, that is no longer the case for > > 'interactive' documents - i.e. ones with script and/or animation. So > > the right thing to do now is to register a JGVTComponentListener with > > the canvas to catch componentTransformChanged events instead. > > > >> thomas.deweese wrote: > >> > > >> > Hi Luc, > >> > > >> >> Luc_B wrote: > >> >> > > >> >> > I am trying to implement a back / forward history in the svg > > whenever > >> > a > >> >> > user has panned or zoomed. > >> >> > > >> >> > I have tried to reuse the TransformHistory class from the > > SVGBrowser > >> > but > >> >> > they seem to only store the RenderingTransform at load. I need more > > > >> > than > >> >> > that. > >> > > >> > In my tests it records all my pan and zoom actions. Are you > > including > >> > the code from the JSVGViewerFrame that notifies the history class of > >> > transform changes? > >> > > >> >> > I want to know what AffineTransform should I store so when the user > > > >> > hits > >> >> > back in order to show him where he was before. > >> > > >> > 'canvas.getRenderingTransform()'. > >> > > >> >> > I am also wondering how to restore the svg view to that specific > >> > point... > >> > > >> > 'canvas.setRenderingTransform( affine );' > >> > > >> > This is all in the JSVGViewerFrame class already. Just look for > > all > >> > the lines with 'transformHistory'. > >> > > >> > > >> > >> -- > >> View this message in context: http://www.nabble.com/Pan-and-zoom- > >> navigation-history-tp24074338p24260583.html > >> Sent from the Batik - Users mailing list archive at Nabble.com. > >> > >> > >> --------------------------------------------------------------------- > >> To unsubscribe, e-mail: batik-users-unsubscribe@... > >> For additional commands, e-mail: batik-users-help@... > >> > > > > > > -- > View this message in context: http://www.nabble.com/Pan-and-zoom- > navigation-history-tp24074338p24277832.html > Sent from the Batik - Users mailing list archive at Nabble.com. > > > --------------------------------------------------------------------- > To unsubscribe, e-mail: batik-users-unsubscribe@... > For additional commands, e-mail: batik-users-help@... >

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