[Geotools-devel] problem with MapViewer demo

[William S. <wst...@wh...>]

Hi all,

There seems to be a problem with MapViewer in the j2se-demos module. 
 After successfully loading in in a polygon shapefile and creating the 
shapefile datasource and feature collection in the mapPane method, I got 
the following messages:

Layers: 1
java.awt.Rectangle[x=0,y=0,width=300,height=300]
Aug 27, 2003 3:50:23 PM org.geotools.gui.swing.MapPaneImpl paintComponent
WARNING: Transform error while rendering. Cause is: null
Aug 27, 2003 3:50:24 PM org.geotools.gui.swing.MapPaneImpl paintComponent
WARNING: Transform error while rendering. Cause is: null
java.awt.Rectangle[x=0,y=0,width=300,height=300]

and a blank (all white) frame with no map showing.  After looking at 
MapViewer2, a simple solution to correct this is to explicitly set the 
area of interest for the context in the  createMapPane method of 
MapPaneImpl, as in

    context.getBoundingBox().setAreaOfInterest(fc.getBounds());

The underlying cause of the problem is that, without explicitly setting 
the AOI, the areaOfInterest of the variable bounds in context seems to 
be set with miny=180, minx=-180, maxy=180, maxx=-180--which of course is 
a rectangle collapsed to a point--and a call to 
dotToCoordinateTransform.createInverse() in the paintComponent method of 
MapPaneImpl triggers the "transform error" warning.  

Apologies, but I haven't been able to track down where the AOI for 
bounds in context gets set as it does, but I suspect it is in an 
initialization step somewhere.  Fixing this would, of course, be the 
best solution.

Best regards,

Buck Stockhausen

-- 
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*William T. Stockhausen, Ph.D.     |email: Wil...@no...*
*NRC Postdoctoral Fellow           |voice: 508-289-2238                *
*Northeast Fisheries Science Center|fax:   508-457-2169                *
*National Marine Fisheries Service |web:   http://www.nefsc.noaa.gov   *
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