Question

JavaScript => public var deltaPosition: Vector2;
C# => public Vector2 deltaPosition;

Description 描述

The position delta since last change.

自最后改变的位置增量。

The absolute position of the touch is recorded periodically and available in the position property. The deltaPosition value is a Vector2 that represents the difference between the touch position recorded on the most recent update and that recorded on the previous update. The deltaTime value gives the time that elapsed between the previous and current updates; you can calculate the touch's speed of motion by dividing deltaPosition.magnitude by deltaTime.

触摸的绝对位置被周期性地记录并在位置属性可用。deltaPosition 的值是个Vector2，表示最近update被记录的位置和上次update记录位置之间的差。该deltaTime值给出了以前和当前的update之间的时间间隔;您可以通过deltaPosition.magnitude除以deltaTime计算运动的触摸的速度。

See Also: deltaTime.

C#:

using UnityEngine;
using System.Collections;
 
public class Sample : MonoBehaviour {
 
	void Update () 
	{
		int nbTouches = Input.touchCount;
 
		if(nbTouches > 0)
		{
			for (int i = 0; i < nbTouches; i++)
			{
				Touch touch = Input.GetTouch(i);
 
				TouchPhase phase = touch.phase;
 
				switch(phase)
				{
				case TouchPhase.Began:
					print("New touch detected at position " + touch.position + " , index " + touch.fingerId);
					break;
				case TouchPhase.Moved:
					print("Touch index " + touch.fingerId + " has moved by " + touch.deltaPosition);
					break;
				case TouchPhase.Stationary:
					print("Touch index " + touch.fingerId + " is stationary at position " + touch.position);
					break;
				case TouchPhase.Ended:
					print("Touch index " + touch.fingerId + " ended at position " + touch.position);
					break;
				case TouchPhase.Canceled:
					print("Touch index " + touch.fingerId + " cancelled");
					break;
				}
			}
		}
	}
}

Touch