TrafficRoad/Assets/Scripts/Pass2/Tool/TraficLightUI.cs

using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using UnityEngine.UI;


public enum LightDir
{
    up,
    down,
    left,
    right
}
/// <summary>
/// 红绿灯UI
/// </summary>
public class TraficLightUI : MonoBehaviour
{
    public Sprite red, yellow, green;
    public Transform _target;
    [SerializeField]
    private float redTime, yellowTime, greenTime;

    private bool _isRed, _isGreen, _isYellow = false;

    private Image image;
    [SerializeField]
    private float timer = 0f;

    private TraficLightUI _elseDirLight;


    public void Init(bool isGreen, TraficTimeSet set, Transform target, LightDir dir,TraficLightUI elseDirLight)
    {
        image = GetComponent<Image>();
        transform.SetParent(GameObject.Find("Canvas").transform);

        redTime = set.redTime;
        yellowTime = set.yellowTime;
        greenTime = set.greenTime;

        if (isGreen)
        {
            
            _isGreen = true;
            image.sprite = green;
        }
        else
        {
            _isRed = true;
            image.sprite = red;
        }
        _target = target;

        //UI方向调整
        switch (dir)
        {
            case LightDir.up:

                break;
            case LightDir.down:

                break;
            case LightDir.left:

                break;
            case LightDir.right:

                break;
        }

        _elseDirLight = elseDirLight;
    }


    private void Update()
    {
        LightChange();
        ZoneUI();
    }
    /// <summary>
    /// 红绿灯切换
    /// </summary>
    private void LightChange()
    {

        if (_isGreen)
        {
            timer += Time.deltaTime* TraficLightManager.Instance.traficLightTimeScale;
            if (timer >= greenTime)
            {
                _isYellow = true;
                image.sprite = yellow;

                _isGreen = false;
                timer = 0f;
            }
        }
        else if (_isYellow)
        {
            timer += Time.deltaTime* TraficLightManager.Instance.traficLightTimeScale;
            if (timer >= yellowTime)
            {
                _isRed = true;
                image.sprite = red;

                _isYellow = false;
                timer = 0f;
                //让另一方向的灯绿
                _elseDirLight._isGreen = true;
                _elseDirLight.image.sprite = _elseDirLight.green;
            }
        }
    }

    /// <summary>
    /// 屏幕坐标跟随3D空间
    /// </summary>
    private void ZoneUI()
    {
        if (_target != null)
        {
            Vector3 screenPos = Camera.main.WorldToScreenPoint(_target.position);
            this.transform.position = screenPos;
        }
    }


}