unity3D物体移动和缩放（手机端）

//为了方便操作放上源码
//新建脚本 把脚本放在需要移动的物体身上
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 / 10, 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;
}

}