Pong/Assets/Scripts/Game/Ball.cs

using Unity.Netcode;
using UnityEngine;

namespace Game {
	public class Ball : NetworkBehaviour {

		private const float SpeedGain = 1.025f;

		public Rigidbody2D Rb { get; private set; }

		public Player LastContactPlayer { get; private set; }

		public bool IsPermanent { get; set; }

		private CircleCollider2D Collider { get; set; }

		public float Radius {
			get => transform.localScale.x * Collider.radius;
			set => transform.localScale = new Vector3(1, 1, 1) * value * 2;
		}

		private void Awake() {
			Rb = GetComponent<Rigidbody2D>();
			Collider = GetComponent<CircleCollider2D>();
		}

		private void OnCollisionEnter2D(Collision2D other) {
			if (other.gameObject.TryGetComponent(out Player player))
				PlayerContact(player);
		}

		private void PlayerContact(Player player) {
			LastContactPlayer = player;
			Rb.velocity *= SpeedGain;
		}
	}
}