Unity 移动端,手指移动缩放物体

Unity 移动端,手指移动缩放物体
下面代码直接挂载到要缩放的问题上面即可

using System.Collections;
using System.Collections.Generic;
using UnityEngine;
public class RotateControl : MonoBehaviour
{
    
    
    float x = 0f;
    float y = 0f;
    float Speed = 0.25f;

    Vector2 oldPosition1;
    Vector2 oldPosition2;

   
    void Update()
    {
    
    
        //没有触摸  
        if (Input.touchCount <= 0)
        {
    
    
            return;
        }
        if (Input.anyKey)
        {
    
    
            //当只有一次触摸
            if (Input.touchCount == 1)
            {
    
    
                //触摸类型，滑动
                if (Input.GetTouch(0).phase == TouchPhase.Moved)
                {
    
    
                    //获取x轴
                    x = Input.GetAxis("Mouse X") * Speed;
                    //获取y轴
                    y = Input.GetAxis("Mouse Y") * Speed;
                    transform.Translate(x, y, 0);
                }

            }
            //当两次触摸
            if (Input.touchCount > 1)
            {
    
    
                //两次触摸都有滑动
                if (Input.GetTouch(0).phase == TouchPhase.Moved || Input.GetTouch(1).phase == TouchPhase.Moved)
                {
    
    
                    //获取第一、二次两次触摸的位置
                    Vector2 tempPosition1 = Input.GetTouch(0).position;
                    Vector2 tempPosition2 = Input.GetTouch(1).position;
                    //放大
                    if (isEnlarge(oldPosition1, oldPosition2, tempPosition1, tempPosition2))
                    {
    
    
                        float oldScale = transform.localScale.x;
                        float newScale = Mathf.Clamp(oldScale * 1.3f, 0.3f, 1.8f); ;
                        transform.localScale = new Vector3(newScale, newScale, newScale);
                    }
                    else//缩小
                    {
    
    
                        float oldScale = transform.localScale.x;
                        float newScale = Mathf.Clamp(oldScale / 1.3f, 0.3f, 1.8f);
                        transform.localScale = new Vector3(newScale, newScale, newScale);
                    }
                    //备份上一次触摸点的位置，用于对比   
                    oldPosition1 = tempPosition1;
                    oldPosition2 = tempPosition2;
                }
            }
        }

    }
    /// <summary>
    /// 比较两次的位置，大小，来进行放大还是缩小
    /// </summary>
    /// <param name="oP1"></param>
    /// <param name="oP2"></param>
    /// <param name="nP1"></param>
    /// <param name="nP2"></param>
    /// <returns></returns>
    bool isEnlarge(Vector2 oP1, Vector2 oP2, Vector2 nP1, Vector2 nP2)
    {
    
    
        //函数传入上一次触摸两点的位置与本次触摸两点的位置计算出用户的手势   
        var leng1 = Mathf.Sqrt((oP1.x - oP2.x) * (oP1.x - oP2.x) + (oP1.y - oP2.y) * (oP1.y - oP2.y));
        var leng2 = Mathf.Sqrt((nP1.x - nP2.x) * (nP1.x - nP2.x) + (nP1.y - nP2.y) * (nP1.y - nP2.y));
        if (leng1 < leng2)
        {
    
    
            //放大手势   
            return true;
        }
        else
        {
    
    
            //缩小手势   
            return false;
        }
    }


}