A bounding box query (matching the area the person clicked) will do.
There is an example in the user guide
http://docs.codehaus.org/display/GEOTDOC/Filter+Examples
Under "What did I click on":
ReferencedEnvelope pixels = new ReferencedEnvelope( x-1,y-1, x+1, y+1,
screenCRS );
MathTransform screen2world= CRS.findMathTransform(screenCRS, dataCRS);
ReferencedEnvelope selected = JTS.transform( pixels, null,
screen2world, 10 );
FilterFactory2 ff = CommonFactoryFinder.getFilterFactory2
( GeoTools.getDefaultHints );
Filter filter = ff.bbox( ff.property("THE_GEOM" ), ff.literal
( selected ) );
Jody
On 05/10/2009, at 4:15 PM, dadar wrote:
I need to gain data from an area in my shapefile when i clicked it
does anybody know which function and how can I get the data??
and how can I get the center point (x,y) from a polygon??
Darmawan
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