Event.delta

Description

The relative movement of the mouse compared to last event.

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

	// 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);
        
    }
}

import UnityEngine
import System.Collections

public class ExampleClass(MonoBehaviour):

	def OnGUI() as void:
		e as Event = Event.current
		if e.isMouse:
			Debug.Log(e.delta)