Re: [udig-devel] Re: tiled rendering and labels

[Emily Gouge <egouge@xxxxxxxxxxxxxxx>]

Okay, I've committed the modifications I made to allow the first cut of 
label rendering for tiles.

I think the remainder of this conversation needs a irc chat as I'm not 
sure I understand your comment below about using glasspane to draw labels.

Thanks,
Emily

Jody Garnett wrote:
> Hi Emily; no problem adding methods; the api is open to revision - I
> do suggest we review RenderContext just befure udig 1.2 is released
> and make sure everything has javadocs and there are no duplicate or
> unused methods.
>
> This meta tiling thing is (I think anyways) the idea I mentioned about
> doing a "batch" of several tiles at once; and I guess in this case
> allowing the batch to share a common labelCache.
>
> We also talked about storing the label cache for each graphics context
> (ie for ecah tile) but not drawing them into the tile. We can applying
> the label cache from all the tiles on the screen as you move around
> (using the glasspane or similar). It would represent an interesting
> compromise that a desktop app can provide.
>
> Jody
>
> On Thu, Apr 9, 2009 at 4:40 AM, Emily Gouge <egouge@xxxxxxxxxxxxxxx> wrote:
> > Hello Again Jody,
> >
> > I had a look at this issue again this morning and have a partial solution to
> > it.  However I need to add the following method to the
> > RenderContextImpl.java class (and modify the getLabelPainter method
> > slightly)
> >
> > public synchronized void setLabelPainter(ILabelPainter labelPainter){
> >        this.labelPainter = labelPainter;
> > }
> >
> > Do you have any objections to me adding this function?
> >
> > I've attached a picture of what I have working at the moment.  As you can
> > see the labels show up for each tile, however there are some issue with
> > label chopping at tile boundaries.  I guess this can probably be fixed by
> > "meta-tiling".
> >
> > Emily
> >
> > Emily Gouge wrote:
> > > Yes Jody, you are correct.  Labels and tiled rendering do not work well
> > > together.  I looked into this briefly at one point but I didn't find a
> > > decent solution.  I believe what we are going to need is one label renderer
> > > for each tile rather than just a single label renderer.
> > >
> > > I may have some time over the next few weeks to look at this further. Not
> > > sure at the moment.
> > >
> > > Emily
> > >
> > >
> > >
> > > Jody Garnett wrote:
> > > > Hi Emily: This may be another corner case; I was testing out tiled
> > > > renderer with the "climate change intergration showcase" dataset for
> > > > foss4g this year. And labels went absolulty bonkers... this test is
> > > > with the last udig 1.2-M3 release and does not reflect any recent work
> > > > you have done.
> > > >
> > > > Near as I can tell the label cache implementation is not being reset
> > > > on a tile by tile basis; you may even wish to store a tilecache in the
> > > > render context you create for each tile? I am not sure how it should
> > > > be done ...
> > > >
> > > > Jody
> > > >
> > > >
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