Event.delta

Description

与上次事件相比该鼠标的相对移动。

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

另请参阅：Event.mousePosition。

using UnityEngine;

public class Example : MonoBehaviour
{
    // Move the scroll wheel to determine
    // the X & Y scrolling amount.
    void OnGUI()
    {
        Event e = Event.current;
        if (e.isMouse)
        {
            Debug.Log(e.delta);
        }
    }
}