import java.awt.event.*;
               
 
               
void setup() {
               
 addMouseWheelListener(new MouseWheelListener() { 
               
 public void mouseWheelMoved(MouseWheelEvent mwe) { 
               
 mouseWheel(mwe.getWheelRotation());
               
 }}); 
               
}
               
 
               
void mouseWheel(int delta) {
               
 println("mouse has moved by " + delta + " units."); 
               
}
               
 
               
void draw() {
               
 
               
}