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Event.delta

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public var delta: Vector2;
public Vector2 delta;

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);
		}
	}
using UnityEngine;
using System.Collections;

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