using System.Collections.Generic;
using UnityEngine;
public class UavTrailRender : MonoBehaviour
{
    /// <summary>
    /// 启动轨迹渲染
    /// </summary>
    public bool open_trailing;
    /// <summary>
    /// 轨迹材质
    /// </summary>
    public Material material;
    /// <summary>
    /// 轨迹起始颜色
    /// </summary>
    public Color color_start = Color.red;
    /// <summary>
    /// 轨迹终止颜色
    /// </summary>
    public Color color_end = Color.green;
    /// <summary>
    /// 轨迹起始宽度
    /// </summary>
    public float thinkness_start = 0.1f;
    /// <summary>
    /// 轨迹终止宽度
    /// </summary>
    public float thinkness_end = 0.1f;

    /// <summary>
    /// 轨迹更新位置
    /// </summary>
    private Vector3 pos;
    /// <summary>
    /// 轨迹更新频率
    /// </summary>
    public float frequency = 0.1f;
    /// <summary>
    /// 频率计时器
    /// </summary>
    private float timer;

    private LineRenderer current_trail;

    /// <summary>
    /// 所有轨迹列表
    /// </summary>
    public List<LineRenderer> trail_list = new List<LineRenderer>();

    /// <summary>
    /// 自动画点，还是路径模式
    /// </summary>
    private bool is路径模式=false;

    void Update()
    {
        if (open_trailing)
        {
            //if (!is路径模式)
            {
                //自动画点模式
                timer += Time.deltaTime;
                if (timer > frequency)
                {
                    timer = 0;
                    if (pos != transform.position)
                    {
                        UpdateTrail();
                    }
                }
            }
        }
        else
        {
            if (current_trail != null)
            {
                current_trail.startWidth = current_trail.endWidth;
                current_trail = null;
            }
        }
    }

    /// <summary>
    /// 打开轨迹渲染
    /// </summary>
    /// <param name="_color"></param>
    /// <param name="_thinkness"></param>
    /// <param name="is路径模式"></param>
    public void Open(Color _color, float _thinkness,bool is路径模式)
    {
        open_trailing = true;
        this.is路径模式 = is路径模式;
        color_start = color_end = _color;
        thinkness_end = _thinkness;

        //初始化renderlinender
        if (current_trail == null)
        {
            InstantiateTrail();
            //实例化轨迹后立即更新当前位置
            if (!is路径模式)
            {
                UpdateTrail();
            }
        }
    }

    public void Close()
    {
        open_trailing = false;
    }

    /// <summary>
    /// 更新轨迹，当前坐标自动给点
    /// </summary>
    public void UpdateTrail()
    {
        current_trail.positionCount++;
        current_trail.SetPosition(current_trail.positionCount - 1, transform.position);
        pos = transform.position;
    }

    /// <summary>
    /// 更新轨迹，手动给点
    /// </summary>
    /// <param name="potion"></param>
    public void UpdateTrail(Vector3 potion)
    {
        current_trail.positionCount++;
        current_trail.SetPosition(current_trail.positionCount - 1, potion);
        pos = potion;
    }

    /// <summary>
    /// 实例化新轨迹
    /// </summary>
    public void InstantiateTrail()
    {
        var go = new GameObject("");
        go.transform.SetParent(transform);
        trail_list.Add(current_trail = go.AddComponent<LineRenderer>());
        current_trail.positionCount = 0;
        current_trail.startWidth = thinkness_end * 1.1f;
        current_trail.endWidth = thinkness_end;
        if (material == null)
            material = UAVManager.Instance.trail_material;
        current_trail.material = material;
        current_trail.startColor = color_start;
        current_trail.endColor = color_end;
    }
}