Event.delta
var delta: Vector2;
Description

The relative movement of the mouse compared to last event.

Used in EventType.MouseMove, EventType.MouseDrag, EventType.ScrollWheel events.

See Also: Event.mousePosition.
	// Move the scroll wheel to determine
	// the X & Y scrolling amount.
	function OnGUI() {
		var e : Event = Event.current;
		if (e.isMouse) {
			Debug.Log(e.delta);
		}
	}