ActionTowerDefense/ActionTowerDefense/Assets/Scripts/Portal/PortalsCountDownUI.cs

using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using TMPro;

public class PortalsCountDownUI : MonoBehaviour
{
    public CameraController cameraController;

    public Vector3 portalPos;       //传送门位置
    public TextMeshProUGUI[] text;  //倒计时数字
    public GameObject[] effect;     //UI指示器
    public GameObject[] countDown;  //text和effect的父物体
    public Vector2 parentRect;      //父物体Rect Transform的长宽的一半
    public float hypotenuse;        //父物体Rect Transform斜边的长度
    public float myRect;            //自己的边长的一半

    private void Start()
    {
        hypotenuse = parentRect.magnitude;
        cameraController = GameObject.Find("View").GetComponent<CameraController>();
    }

    private void Update()
    {
        refreshPortalUIPos(cameraController.mainCamera, 0,
            -parentRect + new Vector2(myRect, myRect),
            parentRect - new Vector2(myRect, myRect));
        if (countDown[1].activeSelf)
        {
            countDown[1].SetActive(false);
        }
        //if (cameraController.isSplit)
        //{
        //    Camera camera0 = cameraController.player0Camera;
        //    Camera camera1 = cameraController.player1Camera;
        //    refreshPortalUIPos(
        //        camera0, 0,
        //        new Vector2(25 + (camera0.rect.x - 0.5f) * parentRect.x * 2 + myRect,
        //            - parentRect.y + myRect),
        //        new Vector2(-25 + camera0.rect.x * parentRect.x * 2 - myRect,
        //            parentRect.y - myRect));
        //    refreshPortalUIPos(
        //        camera1, 1,
        //        new Vector2(25 + (camera1.rect.x - 0.5f) * parentRect.x * 2 + myRect,
        //            - parentRect.y + myRect),
        //        new Vector2(-25 + camera1.rect.x * parentRect.x * 2 - myRect,
        //            parentRect.y - myRect));
        //}
        //else
        //{
        //    refreshPortalUIPos(cameraController.mainCamera, 0,
        //        - parentRect + new Vector2(myRect, myRect),
        //        parentRect - new Vector2(myRect, myRect));
        //    if (countDown[1].activeSelf)
        //    {
        //        countDown[1].SetActive(false);
        //    }
        //}
    }

    //刷新指示箭头显示
    void refreshPortalUIPos(Camera camera,int id,Vector2 RectClampMin,Vector2 RectClampMax)
    {
        //计算指示箭头的方向
        Vector3 pos = camera.transform.position;
        float angle = Mathf.Atan2(portalPos.y - pos.y, portalPos.x - pos.x) * Mathf.Rad2Deg - 90;
        effect[id].transform.rotation = Quaternion.Euler(Vector3.forward * angle);

        //判断传送门是否在屏幕内
        Vector3 viewportPoint = camera.WorldToViewportPoint(portalPos);
        if (viewportPoint.x >= 0 && viewportPoint.y >= 0 
            && viewportPoint.x <= camera.rect.width && viewportPoint.y <= 1
            && viewportPoint.z > camera.nearClipPlane)
        {
            if (countDown[id].activeSelf)
            {
                countDown[id].SetActive(false);
            }
        }
        else
        {
            if (!countDown[id].activeSelf)
            {
                countDown[id].SetActive(true);
            }

            //计算指示箭头的位置
            Vector3 target = new Vector3(portalPos.x - pos.x, portalPos.y - pos.y, 0);
            target = target.normalized * hypotenuse;
            target.x = Mathf.Clamp(target.x, RectClampMin.x, RectClampMax.x);
            target.y = Mathf.Clamp(target.y, RectClampMin.y, RectClampMax.y);
            countDown[id].transform.localPosition = target;
        }
    }
}