Version: 2017.4
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public var delta: Vector2;
public Vector2 delta;


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) {
using UnityEngine;
using System.Collections;

public class ExampleClass : MonoBehaviour { void OnGUI() { Event e = Event.current; if (e.isMouse) Debug.Log(; } }