RE: "Refreshing" the JSVGCanvas...

["Bishop, Michael W. CONTR J9C880" <Mi...@je.jfcom.mil>]

Revisiting this point, I did add a refresh button because it was
requested.  If I refresh the canvas (using setDocument() instead of
setURI() since I'm working with a document in memory), it resets the
view transform.  If the user is zoomed/panned, it gets reset.  Is there
a way to refresh a document, then restore their view transform?

Michael Bishop

-----Original Message-----
From: thomas.deweese@kodak.com [mailto:thomas.deweese@kodak.com] 
Sent: Sunday, January 22, 2006 2:12 PM
To: batik-users@xmlgraphics.apache.org
Cc: batik-users@xmlgraphics.apache.org
Subject: RE: "Refreshing" the JSVGCanvas...

Hi Michael,

"Bishop, Michael W. CONTR J9C880" <Mi...@je.jfcom.mil> wrote on

01/22/2006 12:31:54 AM:

> Yes, I'm using JSVGScrollPane.  I get all kinds of weirdness.  If I
zoom 
in 
> (triggering the "default" zoom action JSVGCanvas.ZoomInAction), it
puts 
scroll
> bars on the JSVGCanvas.  So far, so good.  Zooming back out (again
with 
> default JSVGCanvas.ZoomOutAction), does not remove the scroll bars. 
Zooming 
> out once more will. 

   Hmmm, these sound like some bugs that I fixed in the scroll pane.
You might try the SVN version if you aren't using it already...

> But that's no major issue.  It's the lack of screen 
> updates (I won't say repaint() since JSVGCanvas.repaint() IS called) 
which is 
> the real frequent problem-causer.

   The problem is that if repaint is being called then it is drawing
what it has... One way to force a redraw is to tweak the scale of 
the renderingTransform on the Canvas.  But I suspect there is something
really wrong here...

> From: thomas.deweese@kodak.com [mailto:thomas.deweese@kodak.com]
> Sent: Sat 1/21/2006 6:12 PM
> To: batik-users@xmlgraphics.apache.org
> Cc: batik-users@xmlgraphics.apache.org
> Subject: RE: "Refreshing" the JSVGCanvas...
> 
> 
> 
> Hi Michael,
> 
> "Bishop, Michael W. CONTR J9C880" <Mi...@je.jfcom.mil> wrote
on
> 01/21/2006 06:03:36 PM:
> 
> > setURI() is a good idea.  I never ran into issues with the
JSVGCanvas
> painting
> > correctly until I added scroll bars.  It seems that if I zoom in or 
out
> on my
> > application, then try to draw (add data to the document), nothing
> appears on
> > the canvas until I move the scroll bars.
> 
>    What scroll bars are you using?  JSVGScrollPane?
> 
> > I did a little debugging and it turns out that repaint() on the
canvas
> IS
> > being called.  It just doesn't show on the screen until I move a 
scroll
> > bar.  Any idea how that could be related?
> 
>    Well I am unsure how well the Canvas will work with the
> standard JScrollPane.
> 
> >
> > Michael Bishop
> >
> > ________________________________
> >
> > From: Andrew Plotkin [mailto:erkyrath@eblong.com]
> > Sent: Sat 1/21/2006 12:51 AM
> > To: batik-users@xmlgraphics.apache.org
> > Subject: Re: "Refreshing" the JSVGCanvas...
> >
> >
> >
> > On Fri, 20 Jan 2006, Bishop, Michael W. CONTR J9C880 wrote:
> >
> > > Is there a way to refresh the JSVGCanvas?  Basically tell it to
> > > re-render the entire document?  I'm thinking repaint(); but I
don't
> know
> > > how that's implemented in the JSVGCanvas, so I figured I'd ask to 
make
> > > sure it really does redraw the entire document.
> >
> > If you used setURI() to load the SVG in the first place, you can
call 
it
> > again with the same argument.
> >
> > However, if you're manipulating the canvas correctly (i.e., from the
> right
> > thread) you shouldn't need to do any redraws. I've always found that

it
> > redraws itself when necessary, *unless* I had thread bugs.
> >
> > (I only use the setURI() trick when the file on disk has changed,
and 
I
> > want to reload it.)
> >
> > --Z
> >
> > --
> > "And Aholibamah bare Jeush, and Jaalam, and Korah: these were the
> borogoves..."
> > *
> > Just because you vote for the Republicans, doesn't mean they let you

be
> one.
> >
> >
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> >
> > [attachment "winmail.dat" deleted by Thomas E. DeWeese/449433/EKC]
> >
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RE: "Refreshing" the JSVGCanvas...

[Tonny Kohar <to...@kiyut.com>]

Hi,

On Fri, 2006-02-03 at 09:06 -0500, Bishop, Michael W. CONTR J9C880
wrote:
> Revisiting this point, I did add a refresh button because it was
> requested.  If I refresh the canvas (using setDocument() instead of
> setURI() since I'm working with a document in memory), it resets the
> view transform.  If the user is zoomed/panned, it gets reset.  Is there
> a way to refresh a document, then restore their view transform?

I am not sure if the method below works
1) you need to get the current view transform before refresh
(setURI/setDocument)
2) Refresh the canvas
3) apply back the transform you acquired before to the canvas after
refreshing

Regards
Tonny Kohar
-- 
Sketsa 
SVG Graphics Editor
http://www.kiyut.com


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