Unity移动端手势操作——缩放3D物体

来源：互联网发布：事件提醒软件app 编辑：程序博客网时间：2024/04/29 20:08

自己写的一套用于Unity移动端手势操作的判断，主要有单指移动3D物体、单指旋转3D物体、双指缩放3D物体，这里首先分开介绍双指缩放3D物体，如下所示：

using UnityEngine;using System.Collections;public class ZoomControl : GestureControl{    //记录上一次手机触摸位置判断用户是在左放大还是缩小手势      private Vector2 oldPosition1;    private Vector2 oldPosition2;    //实时大小    Vector3 RealScale = new Vector3(1f, 1f, 1f);    //原始大小    float InitialScale = 0;    //缩放速度    public float ScaleSpeed = 0.1f;    //缩放比例    public float MaxScale = 2.5f;    public float MinScale = 0.5f;    void Start()    {        //获取物体最原始大小        InitialScale = this.transform.localScale.x;    }    protected override void InputCheck()    {        #region 多点触摸缩放（真实模型缩放）                if (Input.touchCount > 1)        {            status = 2;            StartCoroutine(CustomOnMouseDown());        }        #endregion    }    IEnumerator CustomOnMouseDown()    {        //当检测到一直触碰时，会不断循环运行        while (Input.GetMouseButton(0))        {            //实时记录模型大小            RealScale = this.transform.localScale;            if (Input.GetTouch(0).phase == TouchPhase.Moved || Input.GetTouch(1).phase == TouchPhase.Moved)            {                //触摸位置                Vector3 tempPosition1 = Input.GetTouch(0).position;                Vector3 tempPosition2 = Input.GetTouch(1).position;                //函数返回真为放大，返回假为缩小                 if (isEnlarge(oldPosition1, oldPosition2, tempPosition1, tempPosition2))                {                    //判断是否超过边界                    if (RealScale.x < InitialScale * MaxScale)                    {                        this.transform.localScale += this.transform.localScale * ScaleSpeed;                    }                }                else                {                    //判断是否超过边界                    if (RealScale.x > InitialScale * MinScale)                    {                        this.transform.localScale -= this.transform.localScale * ScaleSpeed;                    }                }                //备份上一次的触摸位置                oldPosition1 = tempPosition1;                oldPosition2 = tempPosition2;            }            yield return new WaitForFixedUpdate();        }    }    //记录手指位置与初始位置是缩小或放大    bool isEnlarge(Vector2 oP1, Vector2 oP2, Vector2 nP1, Vector2 nP2)    {        float leng1 = Mathf.Sqrt((oP1.x - oP2.x) * (oP1.x - oP2.x) + (oP1.y - oP2.y) * (oP1.y - oP2.y));        float leng2 = Mathf.Sqrt((nP1.x - nP2.x) * (nP1.x - nP2.x) + (nP1.y - nP2.y) * (nP1.y - nP2.y));        if (leng1 < leng2)        {            return true;        }        else        {            return false;        }    }}

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