记录：Unity旋转和缩放物体

两个手指缩放物体参考：缩放物体方法地址

主要用到点击屏幕的方法，然后记录老的位置，当位置发生变化时进行新老值的计算然后改变缩放大小或改变旋转角度

public class ChangeObjectSizeAndRotate: MonoBehaviour{

   [SerializeField] GameObject changeObject; //你要改变的物体
private Vector2 lastSlidePos; //上一个位置
     private Vector2 currentPos; //当前位置
     private Touch lastTouch_1; //上一个触摸点1
     private Touch lastTouch_2; //上一个触摸点2
     private Touch currentTouch_1; //当前触摸点1
     private Touch currentTouch_2; //当前触摸点2
     float lastDistance; //老的触摸点的距离
     float currDistance; //新的触摸点的距离
     float offset; //新老位置差 >0 放大 <0 缩小
     float scaleCoefficient; //缩放系数，根据求出来的位置差计算出来
   private void Update(){
#if UNITY_ANDROID
   if(Input.touchCount > 0)
             {
_RotateAndScale ();
             }
             else
{
//恢复旋转前的位置
                      changeObject .transform.rotation = Quaternion.Slerp( changeObject .transform.rotation, Quaternion.Euler(0, 0, 0), 0.1f);
             }
#endif
}

void _RotateAndScale()
     {
         if (Input.touchCount == 1)
         {
if (Input.touches[0].phase == TouchPhase.Began)
{
lastSlidePos = Input.touches[0].position;
currentPos = Input.touches[0].position;
}
if (Input.touches[0].phase == TouchPhase.Moved)
{
                         currentPos = Input.touches[0].position;
                          changeObject .transform.rotation *= Quaternion.Euler(0, -(currentPos.x - lastSlidePos.x) * 1f, 0);
                         lastSlidePos = currentPos;
}
                 return;
}
currentTouch_1 = Input.GetTouch(0);
currentTouch_2 = Input.GetTouch(1);
         if (currentTouch_2.phase == TouchPhase.Began)
         {
                 lastTouch_2 = currentTouch_2;
                 lastTouch_1 = currentTouch_1;
         }
         if (Input.touches[0].phase == TouchPhase.Moved && Input.touches[1].phase == TouchPhase.Moved)
         {
                 lastDistance = Vector2.Distance(lastTouch_1.position, lastTouch_2.position);
                 currDistance = Vector2.Distance(currentTouch_1.position, currentTouch_2.position);
offset = currDistance - lastDistance;
                 scaleCoefficient = offset / 1000f;
                 Vector3 gameobjectScale = changeObject .transform.localScale;
                 Vector3 scale = new Vector3(gameobjectScale.x + scaleCoefficient, gameobjectScale.y + scaleCoefficient, gameobjectScale.z + scaleCoefficient);
//判断可到达的最大值和最小值因为我xyz三个值相同所以只判断了x
                 if (scale.x >= 0.2f && scale.x <= 1)
                 {
                          changeObject .transform.localScale = scale;
                 }
         lastTouch_1 = currentTouch_1;
         lastTouch_2 = currentTouch_2;
         }
     }

}