Perhaps the easiest way of doing it, without sub-classing JMapPane, is
something like this...
// somewhere in your code...
double clickToZoom = 0.1; // 1 wheel click is 10% zoom
// wheel event handler
public void handleMouseWheelEvent(MouseWheelEvent ev) {
int clicks = ev.getWheelRotation();
// -ve means wheel moved up, +ve means down
int sign = (clicks < 0 ? -1 : 1);
Envelope env = mapPane.getMapArea();
double width = env.getWidth();
double delta = width * clickToZoom * sign;
env.expandBy(delta);
mapPane.setMapArea(env);
mapPane.repaint();
}
Warning: I can't test this because I don't have a mouse wheel :-)
Michael
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