On 10/25/07, theunsgis <[EMAIL PROTECTED]> wrote:
>
> HI all
> Could somebody please help me or direct me in the right direction for
> converting screenXY pixels to world Lat longs.
>
> I added a shp file to a mapcontext with a DefaultGeographicCRS.WGS84
> coordinate reference system.
> I have a mouse listener that listen for mouse movement and i can get the x y
> on the panel.
> Now to convert it to the correct lat long?
>
The way that JMapPane does it is this:
Rectangle bounds = this.getBounds();
double x = (double) (e.getX());
double y = (double) (e.getY());
double width = mapArea.getWidth();
double height = mapArea.getHeight();
double width2 = mapArea.getWidth() / 2.0;
double height2 = mapArea.getHeight() / 2.0;
double mapX = ((x * width) / (double) bounds.width) + mapArea.getMinX();
double mapY = (((bounds.getHeight() - y) * height) / (double)
bounds.height)
+ mapArea.getMinY();
where mapArea is the envelope that represents the bounds of the viewing area.
See JMapPane.mouseClicked(MouseEvent e) for full code examples.
Ian
--
Ian Turton
http://www.geotools.org
http://pennspace.blogspot.com/
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