I loaded a shapefile in geotools 2. I displayed it in a renderer. If I
output the polygons of the renderer's maplayer, the absolute values of
the coordinates are in the neighborhood of 2e6. I want to filter those
polygons with respect to a point. If I create a point manually with
one of the coordinates from the polygons (2e6) it works fine. However
if I create a point based on a mouseclick by using an AffineTransform
created from the envelope (same as getbounds on the collection of
polygons) the point turns out to have x,y absolute values in the range
of 80. While such a point displays OK on the screen it is incompatible
with the polygons (2e6) for purposes of filtering.

What AffineTransform should I be using to go from screen coordinates
to MapLayer coordinates (e.g. 640x480 --> 2*10^6, 8*10^5) There must
be a different way to get an Envelope.

I will be out of town for a few days.