You should report this as a Jira issue then; is there any way for you to create
a small java program showing the problem (it really helps when reporting issues
if the volunteer does not have to try and sort out how to test for the problem).
--
Jody Garnett
On Thursday, 9 June 2011 at 12:12 PM, Alexander Lanin wrote:
> Oh sry, fount the tile code in 2.5. Unfortunately the GridCoverage2D creation
> is identical and there is nothing there beyond that.
>
> Alex
>
>
>
> -----Ursprüngliche Nachricht-----
> Von: Alexander Lanin [mailto:[email protected]]
> Gesendet: Donnerstag, 9. Juni 2011 03:54
> An: [email protected]
> (mailto:[email protected])
> Betreff: Re: [Geotools-gt2-users] osm tiles: GridCoverage2D layers
>
> Hi,
>
>
>
> Thanks for your reply. That’s actually what I’m going for. I have a Cache
> that holds some thousand tiles in ram and a cache that uses the hard drive.
> Using a simple HashMap respectively file names for that. I have a Listener,
> maybe a MapPaneListener, that will download tiles in a separate thread and
> render them as required.
>
>
>
> Back to the missing tiles:
>
>
>
> I was able to eliminate the problem in 2 ways:
>
> map.setRepaint(false);
>
> add all layers
>
> map.setRepaint(true);
>
> map.drawBaseImage(false); // I made this public
>
> map.repaint();
>
>
>
> But since adding all layers may take several seconds that isn’t really
> acceptable. Interesting enough I found another solution:
>
> After adding each layer as described before I add a sleep:
>
> map.getMapContext().addLayer(layer);
>
> Thread.sleep(25);
>
>
>
> Then I can see how tile by tile is drawn - and it flickers a LOT :D
>
> But at least the final result is perfect. It’s just not advisable to look at
> it during rendering…
>
>
>
> I can only guess the Problem is something like addLayer triggering
> drawBaseImage or something multiple times before the last run was even
> completed.
>
>
>
> “We did back port the tile code in GeoTools 2.5.x” can u please point me to
> where that is? I downloaded 2.5.8-src but can’t find it there.
>
>
>
> “I expect you are running into trouble with images being loaded gradually” –
> during testing I have all the BufferedImages in ram.
>
>
>
> Regards,
>
> Alex
>
>
>
> P.S. sry code in last mail lost all line breaks, no idea why that happened.
>
>
>
>
>
> Von: Jody Garnett [mailto:[email protected]]
> Gesendet: Donnerstag, 9. Juni 2011 02:04
> An: [email protected] (mailto:[email protected])
> Cc: [email protected]
> (mailto:[email protected])
> Betreff: Re: [Geotools-gt2-users] osm tiles: GridCoverage2D layers
>
>
>
> We do something similar to display tiles from a range of services (google
> maps, osm, wmts, etc...) in uDig. We gather up the tiles into a collection of
> grid coverages for display. We do however load the tiles in a background
> thread and refresh the screen as they come in (with the option of loading
> them into a memory or disk based cache).
>
>
>
> I expect you are running into trouble with images being loaded gradually; and
> your mapMove gives you a chance to redraw the same image now that it has
> content. You may wish to try and force the content to load (and listen to the
> image so you can tell when it is done); or save the content to disk and
> render from that ...
>
>
>
> We did back port the tile code in GeoTools 2.5.x but there was not enough
> enough collaboration to complete the effort. Since that time a google summer
> of code project has made the uDig tile rendering / fetching system much more
> capable. If anyone is interested in porting the work into an unsupported
> module is welcome to, the uDig code base would happily track the change to
> prevent duplication of future effort.
>
>
>
> --
> Jody Garnett
>
> On Thursday, 9 June 2011 at 9:10 AM, Alexander Lanin wrote:
>
> Hi,
>
> I'm trying to get osm tiles (256x256px images) to display in my JMapPane.
> What I do is: I download tiles from http://tile.openstreetmap.org/ (then I
> cache etc.) and then:
>
> StyleBuilder sb = new StyleBuilder();
> Style style = sb.createStyle(sb.createRasterSymbolizer());
> GridCoverageFactory gridFactory = new GridCoverageFactory(); GridCoverage2D
> grid = gridFactory.create("GridCoverage-" + tile.getUniqueId(),
> tile.getImage(), tile.getEnvelope()); MapLayer layer = new MapLayer(grid,
> style); _map.getMapContext().addLayer(layer);
> _map.repaint();
>
> With _map being a JMapPane.
>
> While this works most of the time, some tiles/layers are sometimes not
> rendered. Actually every time there are some tiles/layers missing.
>
> Interestingly when using JMapPane.moveImage in a completely unrelated part
> of my code (panning) all the tiles show up. I already tried to use
> moveImage(1,1) after addLayer, but that just messes everything up.
>
> Sometimes I get this message:
> 09.06.2011 00:09:30
> org.geotools.renderer.lite.gridcoverage2d.GridCoverageRenderer
> prepareFinalImage
> INFO: The destination envelope does not intersect the envelope of the source
> coverage.
> But that's just 10% of the time tiles/layers are missing.
>
> Am I even on the right track for displaying these images? And why doesn't it
> work? :-)
>
> Oh and I'm using geotools 8.0-M.0 + fix from
> http://jira.codehaus.org/browse/GEOT-3555
>
> Regards,
> Alex
>
>
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