using UnityEngine;
using TMPro;

//距离单位
public enum UnitType
{
    mm = 1000,  //毫米
    cm = 100,   //厘米
    dm = 10,    //分米
    m = 1,     //米
}

//[ExecuteInEditMode]
public class Line : MonoBehaviour
{
    public GameObject StObj, EdObj;
    TextMesh tm;
    LineRenderer line;

    [Header("实时绘制(较多会卡顿)")]
    public bool IsRt = false;
    [Header("线的粗细")]
    public float LineWidth = 0.05f;
    [Header("划线材质球")]
    public Material LineMat;
    [Header("线的颜色")]
    public Color LineColor;
    [Header("长度单位")]
    public UnitType unittype = UnitType.cm;

    Transform tram;

    private void Start()
    {
        //LineMat = new Material(Shader.Find("Standard"));
        CreateTm();
        CreateLine();
    }

    void CreateTm()
    {
        tram = transform.Find("tm");
        if (tram != null)
            tm = tram.GetComponent<TextMesh>();
        if (tm == null)
        {
            tm = new GameObject("tm").AddComponent<TextMesh>();
            tm.color = Color.white;
            tm.fontSize = 20;
            tm.transform.SetParent(this.transform);
            tm.characterSize = 0.1f;
            //tm.GetComponent<RectTransform>().sizeDelta = new Vector2(2, 1);
            //tm.alignment = TextAlignmentOptions.Center;
        }
    }
    void CreateLine()
    {
        line = gameObject.GetComponent<LineRenderer>();
        if (line == null)
            line = gameObject.AddComponent<LineRenderer>();
        line.material = LineMat;
    }
    public void DrawLineInfo()
    {
        tm.text = (Vector3.Distance(StObj.transform.position, EdObj.transform.position) * (int)unittype).ToString("F1") + unittype;
        tm.transform.position = (StObj.transform.position + EdObj.transform.position) / 2 + new Vector3(0, 0.1f, 0);
        line.SetPositions(new Vector3[] { StObj.transform.position, EdObj.transform.position });
        line.startWidth = LineWidth;
        line.endWidth = LineWidth;
        
        LineMat.color = LineColor;
    }

    void Update()
    {
        if (IsRt)
            DrawLineInfo();
    }
}