[Geotools-gt2-users] Getting world coordinates by Mouseclick, Mousebehaviour on StyledMapPane

[Bernhard K. <bka...@li...>]

Hi,

I'm new to Geotools and would like to do a small project which reads 
Shapefiles and displays them in a JFrame.
However, I managed to display my Shapefiles using the same methods as 
the Spearfish Sample on the homepage (JAI, ...).
Now, I have two questions:

1. How do I get the world-coordinates when clicking with the mouse? When 
adding a normal MouseListener, it only returns the coordinates on the 
screen, but I would like to know the position on the map.
I tried adding a MouseListener to the map by doing
8<------------------
public class do_it implements MouseListener {
[...]
StyledMapPane mapPane = new StyledMapPane();
[...]
mapPane.addMousteListener(this);
[...]
public void mouseReleased(MouseEvent me) {
  GeoMouseEvent event = (GeoMouseEvent) me;
}
[...]
8<------------------
Unfortunately I get an InvalidClassCast-Exception, but this is the 
syntax suggested in org.geotools.gui.swing.event.GeoMouseEvent.class so 
I'm confused.
I also tried creating a new GeoMouseEvent with it's constructor using a 
null-transform MathTransform var and manually creating a new Coordinate. 
Didn't work.
So how do I get the world-coordinate of the mouse on the map?

2. How do I change the behaviour of the mouse on a map? When clicking 
and draging the mouse, it generates a zoom-pane with the selected area. 
I want to change this behaviour to pan the map. So, when moving the 
mouse, the map also moves, but doesn't zoom or anything else. Is this 
possible?

And another question: As already mentioned, I'm using the methods as in 
the Spearfish Sample, which uses J2D-renderer. I experienced 
OutOfMemoryExceptions when dealing with larger shapefiles (3x 30 MB). Is 
there a possibility to avoid that?

greetings

Bernhard