"Or you could adopt the strategy that several CursorTools use and
simply draw your lines in XOR."
Yeah, but that would be to easy. :]
Thanks for taking the time to respond Jon. I'm actually thinking
beyond CursorTools, and exploring ideas for drawing temporary graphics
on the LayerViewPanel. I guess I'm wanting to get better acquainted
with OpenJUMP's rendering system.
I acutally reviewed an e-mail from you from many months ago. I had
asked some questions about JUMP's rendering system. You outlined the
basic steps in the rendering process. I wasn't able to understand it
from the source code at the time. At any rate, I found your e-mail
still very helpful, and now that I've become more adept at reading
other's Java code I think I'm getting a fuzzy picture of how
OpenJUMP's rendering works.
I looked at the source code today. I am curious, does the
RenderingManager use ContentIDs to identify the type Renderer that
should be used with each layer? I know it has been a long time for
you. If you don't remember I'll look at the code some more.
You mentioned that "the LayerViewPanel's RenderingManager maintains
several transparent images (one for each layer, then one for the
yellow selection handles, and maybe a couple more)."
I think this is the ImageCachingRenderer and
ImageCachingFeatureCollectionRenderer classes.
I may just have to render the graphics to an offscreen image after the
graphics have been painted to the LayerViewPanel. The downside of this
is that I'll have to paint the grpahics twice. I really wanted to snag
the image that was already generated by the Java2D framework and
painted on the screen.
I'll do some more digging. I might post a question on the uDig mailing
list, and on a Java forum I use.
Thanks again for all of the help Jon. I'm really glad you keep a half
an ear on our list still. :] I hope you are doing well.
The Sunburned Surveyor
On 11/10/06, Jonathan Aquino <[EMAIL PROTECTED]> wrote:
> I think there's a "Copy Image" menu in there somewhere. Or was.
>
> The LayerViewPanel's RenderingManager maintains several transparent images
> (one for each layer, then one for the yellow selection handles, and maybe a
> couple more). So you could add another image ("Renderable" I think they're
> called), or do it manually using the same technique.
>
> Or you could adopt the strategy that several CursorTools use and simply draw
> your lines in XOR.
>
> Jon
>
>
>
> > -----Original Message-----
> > From: [EMAIL PROTECTED]
> > [mailto:[EMAIL PROTECTED] On
> > Behalf Of Sunburned Surveyor
> > Sent: Friday, November 10, 2006 2:26 PM
> > To: JUMP Developers; List for discussion of JPP development and use.
> > Subject: [JPP-Devel] Snagging a "snapshot" of the LayerViewPanel
> >
> >
> > I'm stuck on a small challenge with JUMP/OpenJUMP and I was
> > hoping one of you guys might be able to save me some time
> > beating my head on the concrete.
> >
> > What is the quickest way to snag a "snapshot" image of the
> > contents of the LayerViewPanel? I looked at the
> > LayerViewPanel class, and both of its superclasses Component
> > and JComponent, but I couldn't figure out how to do this. (I
> > don't want to render all of the geometries to an offscreen
> > image. Instead I'd like to snag the image that has already
> > been computed to paint the image on the screen in the program.)
> >
> > Also, is there a way to repaint the LayerViewPanel by passing
> > it an image?
> >
> > I'm working on a way to speed up the rendering of the
> > LayerViewPanel when the user is using a CursorTool. I'll post
> > my thoughts to the OpenJUMP blog when I find an anwer to this
> > question.
> >
> > Thanks,
> >
> > The Sunburned Surveyor
> >
> > --------------------------------------------------------------
> > -----------
> > Using Tomcat but need to do more? Need to support web
> > services, security? Get stuff done quickly with
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> dat=121642
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>
>
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Get stuff done quickly with pre-integrated technology to make your job easier
Download IBM WebSphere Application Server v.1.0.1 based on Apache Geronimo
http://sel.as-us.falkag.net/sel?cmd=lnk&kid=120709&bid=263057&dat=121642
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