Pong/Assets/Scripts/BorderSize.cs

using System;
using JetBrains.Annotations;
using UnityEngine;

[ExecuteInEditMode]
public class BorderSize : MonoBehaviour {
	public float x1, x2, y1, y2;

	private EdgeCollider2D top, bottom, left, right;
	public Transform playGround;

	public static BorderSize Singleton;

	public Vector2 Size => new(x2 - x1, y2 - y1);

	private void OnEnable() {
		Singleton = this;
		top = transform.Find("Top").GetComponent<EdgeCollider2D>();
		bottom = transform.Find("Bottom").GetComponent<EdgeCollider2D>();
		left = transform.Find("Left").GetComponent<EdgeCollider2D>();
		right = transform.Find("Right").GetComponent<EdgeCollider2D>();
	}
	
	private void Update() {
		Vector2 v1 = new Vector2(x1, y2);
		Vector2 v2 = new Vector2(x2, y2);
		Vector2 v3 = new Vector2(x1, y1);
		Vector2 v4 = new Vector2(x2, y1);
		top.points = new[] {v1, v2};
		bottom.points = new[] {v3, v4};
		left.points = new[] {v1, v3};
		right.points = new[] {v2, v4};

		playGround.localPosition = new Vector3((x1 + x2) / 2, (y1 + y2) / 2, 0);
		playGround.localScale = Size;
	}
}