need some suggestions

I am writing a program in Java.

In the end I need a program which will generate vector
graphics.  This
program will need to save the graphics in SVG format as well
as a
rasterized version.

These graphics need to be viewed in a standalone viewer
which can pan
and zoom.  This viewer will need to update automatically
when the
program is re-ran.

I am hoping that Batik can help me out with a lot of this
but I'm having
some trouble making decisions.
What would be the best way for my program to generate these
graphics?
Should I use a StringBuilder and keep adding my <rect
/>'s or should I
use a Document class?

On the viewer side, is it possible to get panning and
zooming working
with a JSVGCanvas?  I haven't seen any examples of this.
And as for the viewer updating...Should the program that is
generating
the graphics notify the viewer that the file has been
updated through
RMI?  Should the viewer periodically check the filesystem?
Having an RMI client/server setup seems like overkill and
checking the
filesystem every second seems like a bad idea too.
I've seen text editors that know when a file has been
modified
externally.  Any ideas how they work?

Thanks for the help,
~Eric

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Am Montag, den 22.10.2007, 15:20 -0400 schrieb Frederich,
Eric P21322:
> And as for the viewer updating...Should the program
that is generating
> the graphics notify the viewer that the file has been
updated through
> RMI?  Should the viewer periodically check the
filesystem?
> Having an RMI client/server setup seems like overkill
and checking the
> filesystem every second seems like a bad idea too.
> I've seen text editors that know when a file has been
modified
> externally.  Any ideas how they work?

If you are targeting a Linux platform, you can probably make
use of
inotify. With this, the kernel can notify your application
when the file
has changed on disk.

Cheers,
Frederik


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Thanks Thomas and Frederik.
Since I'm replying to both of you rather than picking one
I'll just
reply to myself.

Someone reminded me that one of the editors I use checks for
a new file
when the window regains focus.
So I did a couple of tests and it seems that it checks the
filesystem
every 5 seconds or so while it had focus but checks
instantly when it
gains focus.  I think I may implement something like that. 
Plus maybe
listening for pings on a port like Thomas suggested.  If I
have all
three of those things going it should be pretty smooth.

As for the JSVGCanvas are those keys customizable?
I'd like a middle drag to pan, a right drag up/down to zoom
in/out, and
a left drag to do a box zoom.
Maybe a middle click to reset.
I'd try to get the same behavior as some of our other
viewers we use
here.

Thanks again,
~Eric

> -----Original Message-----
> From: Frederich, Eric P21322 
> Sent: Monday, October 22, 2007 3:20 PM
> To: batik-usersxmlgraphics.apache.org
> Subject: need some suggestions
> 
> I am writing a program in Java.
> 
> In the end I need a program which will generate vector
graphics.  This
> program will need to save the graphics in SVG format as
well as a
> rasterized version.
> 
> These graphics need to be viewed in a standalone viewer
which can pan
> and zoom.  This viewer will need to update
automatically when the
> program is re-ran.
> 
> I am hoping that Batik can help me out with a lot of
this but 
> I'm having
> some trouble making decisions.
> What would be the best way for my program to generate
these graphics?
> Should I use a StringBuilder and keep adding my
<rect />'s or should I
> use a Document class?
> 
> On the viewer side, is it possible to get panning and
zooming working
> with a JSVGCanvas?  I haven't seen any examples of
this.
> And as for the viewer updating...Should the program
that is generating
> the graphics notify the viewer that the file has been
updated through
> RMI?  Should the viewer periodically check the
filesystem?
> Having an RMI client/server setup seems like overkill
and checking the
> filesystem every second seems like a bad idea too.
> I've seen text editors that know when a file has been
modified
> externally.  Any ideas how they work?
> 
> Thanks for the help,
> ~Eric
> 
>
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---------
> To unsubscribe, e-mail: batik-users-unsubscribexmlgraphics.apache.org
> For additional commands, e-mail: 
> batik-users-helpxmlgraphics.apache.org
> 
> 

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