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

/// <summary>
/// 掛載在parent上
/// </summary>
public class DrawLine : MonoBehaviour {
    public Image image;//直線素材  給個紅顏色用於識別
   public Vector2 rectA;//指的是rectTransform.anchoredPosition；直線起點
   public  Vector2 rectB;//直線終點
    public Button button;//畫直線按鈕
    public RectTransform point;//輔助顯示起點終點位置的小圓形，實際是一張Image，圓形圖片給個黃色用於識別
    public RectTransform parent;//直線的父物體
    // Use this for initialization
    void Start () {
        Debug.Log(GetComponent<RectTransform>().anchoredPosition);
       button.onClick.AddListener(DrawLineClick);
	}
  
    //劃線功能
    void DrawLineClick()
    {
        DrawStraightLine(rectA, rectB, image.rectTransform, point,transform);
    }

    //劃線功能
    void DrawStraightLine(Vector2 a,Vector2 b, RectTransform prefab,RectTransform point,Transform parent)
    {
        if (a != b)
        {
           
            GameObject point1 = Instantiate(point.gameObject, parent);
            GameObject point2 = Instantiate(point.gameObject, parent);
            point1.SetActive(true);
            point2.SetActive(true);
            point1.GetComponent<RectTransform>().anchoredPosition = a;
            point2.GetComponent<RectTransform>().anchoredPosition = b;

            float distance = Vector2.Distance(a, b);//計算起點終點兩點距離
            float angle = Vector2.SignedAngle(a - b, Vector2.left);//求夾角  計算起點終點的向量和 Vector2.left的夾角

            GameObject go = Instantiate(image.gameObject, parent);//克隆預設進行劃線
            go.gameObject.SetActive(true);
            go.GetComponent<RectTransform>().anchoredPosition = (a + b) / 2;
            go.GetComponent<RectTransform>().sizeDelta = new Vector2(distance, 5);
            go.transform.localRotation = Quaternion.AngleAxis(-angle, Vector3.forward);
            Debug.Log("distance：" + distance + "  angle:" + angle + "  imagePos:" + image.rectTransform.anchoredPosition);
        }

    }

    // Update is called once per frame
    void Update () {
		
	}
}
 

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