using System.Collections;

using System.Collections.Generic;

using UnityEngine;

using UnityEngine.UI;

using DG.Tweening;

public class UIDamage : MonoBehaviour {

    public Text numText;

    private Camera uiCamera;

    RectTransform rectTrans;

    List<Tween> numList = new List<Tween>();

    void Awake() {

        uiCamera = CameraController.Instance.transform.GetComponentInChildren<Camera>();

        rectTrans = transform.GetComponent<RectTransform>();

        EventCenter.AddListener<Vector3, int, int>(EGameEvent.ShowEffectNumber, ShowEffectNumber);

    }

    //public void ConnectButonOnClick() {

    //    UIManager.Instance.PushPanel(UIType.CONNECT_PANEL);

    //}

    private void OnDestroy()

    {

        EventCenter.AddListener<Vector3, int, int>(EGameEvent.ShowEffectNumber, ShowEffectNumber);

    }

    /// <summary>

    /// 根据EffectType不同显示不同颜色，或者不同内容

    /// </summary>

    /// <param name="worldPos"></param>

    /// <param name="effectNum"></param>

    /// <param name="effectType"></param>

    void ShowEffectNumber(Vector3 worldPos, int effectNum, int effectType)

    {

        Vector2 v2 = WorldToUgui(worldPos);

        Text num = Object.Instantiate(numText);

        num.transform.SetParent(this.transform);

        num.transform.localPosition = new Vector3(v2.x, v2.y, 0);

        num.transform.localScale = Vector3.one;

        num.transform.localEulerAngles = Vector3.zero;

        num.gameObject.SetActive(true);

        num.text = "-" + effectNum;

        Tweener tween = num.transform.DOLocalMoveY(num.transform.localPosition.y + 100, 2f);

        tween.SetAutoKill(false);

        numList.Add(tween);

        tween.OnComplete(MyComplete);

    }

    void MyComplete()

    {

        for(int i= numList.Count - 1; i > -1; i--)

        {

            if (numList[i].IsComplete())

            {

                numList[i].Kill();

                Destroy((numList[i].target as Transform).gameObject);

                numList.RemoveAt(i);

            }

        }

    }

    /// <summary>

    /// 将世界坐标转换为Ugui坐标

    /// 这种算法，cavas不能用填充，只能用居中

    /// </summary>

    /// <param name="position"></param>

    /// <returns></returns>

    public Vector2 WorldToUgui(Vector3 position)

    {

        Vector2 screenPoint = Camera.main.WorldToScreenPoint(position);//世界坐标转换为屏幕坐标

        Vector2 screenSize = new Vector2(Screen.width, Screen.height);

        screenPoint -= screenSize / 2;//将屏幕坐标变换为以屏幕中心为原点

        Vector2 anchorPos = screenPoint / screenSize * rectTrans.sizeDelta;//缩放得到UGUI坐标

        return anchorPos;

    }

}