static void click(MouseEvent @event, int x, int y, MouseEvent flags)
{
if (@event.Equals(MouseEvent.LButtonDown))
{
clickPoints.Clear();
clickPoints.Add(new Tuple <int, int>(x, y));
}
else if (@event.Equals(MouseEvent.LButtonUp))
{
clickPoints.Add(new Tuple <int, int>(x, y));
}
}
