using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using UnityEngine.UI;
using UnityEngine.EventSystems;
public class DrawLine : MonoBehaviour,IPointerClickHandler
{
    RectTransform rt;
    void Start()
    {
        rt = GetComponent<RectTransform>();
        Vector2 point1 = rt.anchoredPosition + new Vector2(-rt.sizeDelta.x / 2, rt.sizeDelta.y / 2);
        Vector2 point2 = rt.anchoredPosition + new Vector2(rt.sizeDelta.x / 2, rt.sizeDelta.y / 2);
        Vector2 point3 = rt.anchoredPosition + new Vector2(-rt.sizeDelta.x / 2, -rt.sizeDelta.y / 2);
        Vector2 point4 = rt.anchoredPosition + new Vector2(rt.sizeDelta.x / 2, -rt.sizeDelta.y / 2);
        DrawStraightLine(point1, point2);
        DrawStraightLine(point2, point4);
        DrawStraightLine(point3, point4);
        DrawStraightLine(point3, point1);
    }
    void DrawStraightLine(Vector2 a, Vector2 b)
    {
        GameObject img = new GameObject();
        img.AddComponent<Image>();
        img.transform.SetParent(transform);
        img.GetComponent<Image>().raycastTarget = false;
        float distance = Vector2.Distance(a, b);                                    
        float angle = Vector2.SignedAngle(a - b, Vector2.left);                     
        img.GetComponent<RectTransform>().anchoredPosition = (a + b) / 2;
        img.GetComponent<RectTransform>().sizeDelta = new Vector2(distance, 5);   
        img.transform.localRotation = Quaternion.AngleAxis(-angle, Vector3.forward);
        img.GetComponent<Image>().color = Color.red;
    }

    public void OnPointerClick(PointerEventData eventData)
    {
        
    }
}