Combe, Colin wrote:
Hi
I found the method setAreaOfInterest at the mapContext, but this
requires an envelope.
Not only that I'm not really sure of what an envelope is, I also don't
know how to change the area to be displayed at the envelope. There are
no such things as setter methods or similar.
Is the envelope like a folder, that contains all the layers of a map?
If yes, how do I tell the folder to only grab my AreaOfInterest?
'envelope' basically means rectangle - an envelope is constructed from
two coordinates, representing diagonally opposite corners of the
rectangle.
By the way, have you looked at the pan/zoom example at
http://www.geotools.org/display/GEOTOOLS/How+to+render+a+shape+file,+sty
le+with+SLD,+zoom,+pan+--+jdk+1.5+geotools+2.1.M4
Yes I have. My current class I'm working on is based on this example.
The "pan"-function at this example only shifts the map by clicking on
buttons. I want it to shift, as I drag the mouse and am still looking on
how to do this...
I now tried to make a zoom-function to zoom into an area, the mouse
selected. I use this piece of code to set the preferredArea:
public void mousePressed(MouseEvent e) {
if (state == ZOOM) {
dragStart = pixelToWorld(e.getX(), e.getY(), envelope);
}
}
public void mouseReleased(MouseEvent e) {
if (state == ZOOM) {
dragEnd = pixelToWorld(e.getX(), e.getY(), envelope);
Envelope newenv = new Envelope();
newenv.expandToInclude(dragStart);
newenv.expandToInclude(dragEnd);
mapContext.setAreaOfInterest(newenv);
this.repaint();
}
}
Actually it does not zoom in or even shift the view...
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