Unity中用触摸控制物体旋转和放大

using UnityEngine;using System.Collections;using System.IO;
public class ScaleAndRotate : MonoBehaviour{	private Touch oldTouch1;  //上次触摸点1(手指1)	private Touch oldTouch2;  //上次触摸点2(手指2)
	void Start()	{
	}	

	void Update () {
		//没有触摸		if ( Input.touchCount <= 0 ){			return;		}
		//单点触摸， 水平上下旋转		if( 1 == Input.touchCount ){			Touch touch = Input.GetTouch (0);			Vector2 deltaPos = touch.deltaPosition;						transform.Rotate(Vector3.down  * deltaPos.x , Space.World); 			transform.Rotate(Vector3.right * deltaPos.y , Space.World);		}
		//多点触摸, 放大缩小		Touch newTouch1 = Input.GetTouch (0);		Touch newTouch2 = Input.GetTouch (1);				//第2点刚开始接触屏幕, 只记录，不做处理		if( newTouch2.phase == TouchPhase.Began ){			oldTouch2 = newTouch2;			oldTouch1 = newTouch1;			return;		}				//计算老的两点距离和新的两点间距离，变大要放大模型，变小要缩放模型		float oldDistance = Vector2.Distance(oldTouch1.position, oldTouch2.position);		float newDistance = Vector2.Distance(newTouch1.position, newTouch2.position);
		//两个距离之差，为正表示放大手势， 为负表示缩小手势		float offset = newDistance - oldDistance;
		//放大因子， 一个像素按 0.01倍来算(100可调整)		float scaleFactor = offset / 100f;		Vector3 localScale = transform.localScale;		Vector3 scale = new Vector3(localScale.x + scaleFactor,		                            localScale.y + scaleFactor, 		                            localScale.z + scaleFactor);
		//最小缩放到 0.3 倍		if (scale.x > 0.3f && scale.y > 0.3f && scale.z > 0.3f) {			transform.localScale = scale;		}
		//记住最新的触摸点，下次使用		oldTouch1 = newTouch1;		oldTouch2 = newTouch2;	}
}