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; } }