[geotk] Next step for WMS

[johann sorel]

Hi,

thanks for the feedback on wms.
you can create a jira task for this bug, someone at work can fix this 
quickly, it's just a null test check.
(In the worst case i'll fix it when I come back)


About the image problem, I've seen this error twice before.
Once when I was using an OpenJDK with a low grade graphic card (very old 
one with only 2Mb of ram)
And on an emulated windows on virtualBox.

The problems can come from severals things :
- the graphic card
- the driver
- the JRE implementation
- the operation system

in the J2DCanvas I use a volatile image which is a special 
"bufferedImage" stored on the video card ram.
this speed up the performances but can also lead to some artifacts on 
some "old" configurations.

I guess I'll have to add a hint to replace the VolatileImage by a 
BufferedImage.
You can make a jira task for this too.

johann

Sam B a écrit :
> Dear Johann,
>
> Thanks a lot for that answer. It helped so much that now I am able to 
> get a picture from demis WorldMap server.
>
> > > By the way, looking at puzzle gis, I noticed that the URL for the 
> WMS server contains the "&STYLES=null" argument, which makes the 
> server to send a blank image.
> > > Is it a way to get rid of this ?
>
> I made small investigations about this. I put here a few links so that 
> you can see what happens. I mainly used Puzzle GIS as example. There, 
> when you create your distance source, the default server is
>
>    http://www2.demis.nl/WMS/wms.asp?wms=WorldMap
>
> This is the approximate request that Puzzle-GIS cound have sent :
>
>    
> http://www2.demis.nl/wms/wms.asp?Service=WMS&WMS=WorldMap&Version=1.1.1&Request=GetMap&BBox=-20,-40,60,40&SRS=EPSG:4326&Width=400&Height=400&Layers=Countries&Format=image/png&STYLES=null
>
> You can see that everything is black, but you get an image. Without 
> the "null" now :
>
>    
> http://www2.demis.nl/wms/wms.asp?Service=WMS&WMS=WorldMap&Version=1.1.1&Request=GetMap&BBox=-20,-40,60,40&SRS=EPSG:4326&Width=400&Height=400&Layers=Countries&Format=image/png&STYLES=
>
> And you will see (mainly green) colors.
>
> Now if you do the same with the BlueMarble WMS :
>
>    
> http://www2.demis.nl/wms/wms.ashx?Service=WMS&WMS=BlueMarble&Version=1.1.1&Request=GetMap&BBox=-20,-40,60,40&SRS=EPSG:4326&Width=400&Height=400&Layers=Earth%20Image&Format=image/png&STYLES=
>
> works perfectly well, as
>
>    
> http://www2.demis.nl/wms/wms.ashx?Service=WMS&WMS=BlueMarble&Version=1.1.1&Request=GetMap&BBox=-20,-40,60,40&SRS=EPSG:4326&Width=400&Height=400&Layers=Earth%20Image&Format=image/png&STYLES=null
>
> produces no image.
>
> This may come from line 225 in AbstractGetMap.java, in which 
> toString(styles) probably returns null when no style has been specified.
>
> A workaround could be to call WMSMapLayer.setStyles(new String("")), 
> but as WMSMapLayer extends AbstractMapLayer, which doesn't implement 
> setStyles(), I don't know if it is possible. Does someone knows this ??
>
> I found something else that could maybe be a display bug. Yesterday 
> night I played with Puzzle GIS and were able to get maps from demis, 
> and they displayed correctly on the screen. Now, I am currently 
> developping on another computer. I finally succeeded to get a picture 
> from demis with my test software, but the display was horrible. So I 
> ran PuzzleGIS on the computer I am developping on, and the same 
> "display bug" appears.
>
> Here is a screenshot from Puzzle GIS. Is it possible that this is a 
> display bug depending on the computer ?
>
> http://img353.imageshack.us/img353/1622/puzzlegisbug.jpg
>
> See you,
>
> Sam
>
>
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