Unity3d在手机里面实现用手势放大缩小镜头

 刚进入一家公司，上了4天班了，终于发现自己是那么的菜，看了老大写的一些代码。没办法看下去了，简直太强了，在这几天上班里，因为是很大的公司，感觉自己压力很大很大啊。心里很压抑。因为自己很菜。好了，先不说这些了，加油吧。坚持努力学习。这几天里老大叫我实现在手机里面实现镜头的放大缩小和移动场景，有点像海岛奇兵那样的控制镜头那样的效果，在写这些代码中。遇到了很多很多的问题。因为紧张，也因为自己基础不行。

代码如下，需要把这个脚本绑定在摄像机上：

using UnityEngine;
using System.Collections;

public class CameraController : MonoBehaviour
{

    public float ZoomSpeed = 500;
    public float zoomSpeed
    {
        get
        {
            return ZoomSpeed;
        }
        set
        {
            ZoomSpeed = value;
        }
    }
    public float MaxY = 3921;
    public float maxY
    {
        get
        {
            return MaxY;
        }
        set
        {
            MaxY = value;
        }
    }

    public float MinY = 1200;
    public float minY
    {
        get
        {
            return MinY;
        }
        set
        {
            MinY = value;
        }
    }
    // Update is called once per frame
    private Vector2 lastTouchPos1 = Vector2.zero;
    private Vector2 lastTouchPos2 = Vector2.zero;


    void Update()
    {
      //这里是鼠标控制
        if (Input.GetAxis("Mouse ScrollWheel") != 0)
        {
            var forward = Camera.main.transform.forward * ZoomSpeed * Input.GetAxis("Mouse ScrollWheel");
            Camera.main.transform.position += forward;
        }

   //这里是在手机上手势控制
        if (Input.touchCount > 1)
        {

            if (Input.GetTouch(0).phase == TouchPhase.Moved || Input.GetTouch(1).phase == TouchPhase.Moved)
            {
                Vector2 v1 = Input.GetTouch(0).position;
                Vector2 v2 = Input.GetTouch(1).position;



                float distance = GetDistance(v1, v2);
                Vector3 forward = Camera.main.transform.forward * distance * Time.deltaTime * 0.5f;
                Vector3 newPos = Camera.main.transform.position + forward;
                if (newPos.y > MaxY || newPos.y < MinY)
                {

                }
                else
                {
                    Camera.main.transform.position = newPos;
                }
                lastTouchPos1 = Input.GetTouch(0).position;
                lastTouchPos2 = Input.GetTouch(1).position;

            }
            else
            {
                lastTouchPos1 = Vector2.zero;
                lastTouchPos2 = Vector2.zero;
            }


        }

    }


    private float GetDistance(Vector2 pos1, Vector2 pos2)
    {
        if (lastTouchPos1 == Vector2.zero && lastTouchPos2 == Vector2.zero)
        {
            return 0.0f;
        }

        return (pos2 - pos1).sqrMagnitude - (lastTouchPos2 - lastTouchPos1).sqrMagnitude;
    }

}

这里只是实现镜头的放大缩小，下次补上移动场景的。先加班了，大家加油吧