using System.Collections;
using System.Collections.Generic;
using UnityEngine;
public class ScaleByTwoFinger : MonoBehaviour
{
    public Transform target; //目标
    bool isInit;
    Vector3 touch1, touch2, oriPos, pos;
    float scale, disX, disY, oriScale;
    public float scaleSpeed = 1;

    public bool isLimitScale;
    public float min, max;

    private void Update()
    {
        if (UI_manage.inst.FBX_obj.transform.childCount != 0)
        {
            //不是双指就关闭
            if (Input.touchCount != 2)
            {
                isInit = false;
            }

            //初始化
            if (Input.touchCount == 2 && !isInit)
            {
                //两指点位
                touch1 = Camera.main.ScreenToWorldPoint(Input.GetTouch(0).position);
                touch2 = Camera.main.ScreenToWorldPoint(Input.GetTouch(1).position);

                //目标初始点位
                oriPos = new Vector3(UI_manage.inst.FBX_obj.transform.GetChild(0).position.x, UI_manage.inst.FBX_obj.transform.GetChild(0).position.y, UI_manage.inst.FBX_obj.transform.GetChild(0).position.z);

                //两指中点
                pos = new Vector3((Camera.main.ScreenToWorldPoint(Input.GetTouch(0).position).x + Camera.main.ScreenToWorldPoint(Input.GetTouch(1).position).x) / 2, (Camera.main.ScreenToWorldPoint(Input.GetTouch(0).position).y + Camera.main.ScreenToWorldPoint(Input.GetTouch(1).position).y) / 2, 0);

                //两指中点和目标距离
                disX = pos.x - oriPos.x;
                disY = pos.y - oriPos.y;
                oriScale = UI_manage.inst.FBX_obj.transform.GetChild(0).localScale.x;


                isInit = true;
            }

            if (Input.touchCount == 2)
            {
                //两指缩放比例
                scale = Vector3.Distance(Camera.main.ScreenToWorldPoint(Input.GetTouch(0).position), Camera.main.ScreenToWorldPoint(Input.GetTouch(1).position)) / Vector3.Distance(touch1, touch2);

                //利用scaleSpeed控制缩放速度
                scale = (scale - 1) * scaleSpeed;

                //给缩放比例加限制
                if (isLimitScale && UI_manage.inst.FBX_obj.transform.GetChild(0).localScale.x <= min && scale < 0)
                    return;
                if (isLimitScale && UI_manage.inst.FBX_obj.transform.GetChild(0).localScale.x >= max && scale > 0)
                    return;

                //缩放目标大小
                UI_manage.inst.FBX_obj.transform.GetChild(0).localScale = new Vector3(oriScale + scale, oriScale + scale, oriScale + scale);
                //改变目标位置，让位置保持不变
                UI_manage.inst.FBX_obj.transform.GetChild(0).position = new Vector3(oriPos.x - ((UI_manage.inst.FBX_obj.transform.GetChild(0).localScale.x - oriScale) * disX), oriPos.y - ((UI_manage.inst.FBX_obj.transform.GetChild(0).localScale.y - oriScale) * disY), UI_manage.inst.FBX_obj.transform.GetChild(0).localScale.z - oriScale);
            }
        }
        ////不是双指就关闭
        //if (Input.touchCount != 2)
        //{
        //    isInit = false;
        //}

        ////初始化
        //if (Input.touchCount == 2 && !isInit)
        //{
        //    //两指点位
        //    touch1 = Camera.main.ScreenToWorldPoint(Input.GetTouch(0).position);
        //    touch2 = Camera.main.ScreenToWorldPoint(Input.GetTouch(1).position);

        //    //目标初始点位
        //    oriPos = new Vector3(transform.position.x, transform.position.y, 0);

        //    //两指中点
        //    pos = new Vector3((Camera.main.ScreenToWorldPoint(Input.GetTouch(0).position).x + Camera.main.ScreenToWorldPoint(Input.GetTouch(1).position).x) / 2, (Camera.main.ScreenToWorldPoint(Input.GetTouch(0).position).y + Camera.main.ScreenToWorldPoint(Input.GetTouch(1).position).y) / 2, 0);

        //    //两指中点和目标距离
        //    disX = pos.x - oriPos.x;
        //    disY = pos.y - oriPos.y;
        //    oriScale = transform.localScale.x;


        //    isInit = true;
        //}

        //if (Input.touchCount == 2)
        //{
        //    //两指缩放比例
        //    scale = Vector3.Distance(Camera.main.ScreenToWorldPoint(Input.GetTouch(0).position), Camera.main.ScreenToWorldPoint(Input.GetTouch(1).position)) / Vector3.Distance(touch1, touch2);

        //    //利用scaleSpeed控制缩放速度
        //    scale = (scale - 1) * scaleSpeed;

        //    //给缩放比例加限制
        //    if (isLimitScale && UI_manage.inst.FBX_obj.transform.GetChild(0).localScale.x <= min && scale < 0)
        //        return;
        //    if (isLimitScale && UI_manage.inst.FBX_obj.transform.GetChild(0).localScale.x >= max && scale > 0)
        //        return;

        //    //缩放目标大小
        //    UI_manage.inst.FBX_obj.transform.GetChild(0).localScale = new Vector3(oriScale + scale, oriScale + scale, oriScale + scale);
        //    //改变目标位置，让位置保持不变
        //    transform.position = new Vector3(oriPos.x - ((UI_manage.inst.FBX_obj.transform.GetChild(0).localScale.x - oriScale) * disX), oriPos.y - ((UI_manage.inst.FBX_obj.transform.GetChild(0).localScale.y - oriScale) * disY), 0);
        //}
    }
}