Ball Spawner

Follow this step-by-step guide to create the given script:

Step 1: Create a new script

• In your Unity project, right-click in the 'Assets/RollABall/Game/Scripts' panel and select 'Create' > 'C# Script'. Name the script 'BallSpawner'.

Step 2: Open the script in an editor

• Double-click the 'BallSpawner' script in the 'Assets' panel to open it in your preferred code editor.

Step 3: Add namespaces

• At the top of the script, replace the existing 'using' statements with the following:

  using System.Collections.Generic;
  using NetPad.Attributes;
  using NetPad.Server;
  using UnityEngine;

Step 4: Define the class and inherit from MonoBehaviour

• Replace the 'MonoBehaviour' inheritance in the class definition to match the given script:

  namespace RollABall.Game
  {
      public class BallSpawner : MonoBehaviour
      {
      }
  }

Step 5: Add serialized fields and FindObjectOfType attributes

• Within the 'BallSpawner' class, add the following serialized fields and FindObjectOfType attributes:

  [SerializeField, FindObjectOfType] private NetPadServer Server;
  [SerializeField, FindObjectOfType] private Ball BallPrefab;

Step 6: Create a dictionary for storing balls

• Add a private dictionary for storing the instantiated ball objects:

  private Dictionary<NetPadPlayer, Ball> m_balls = new Dictionary<NetPadPlayer, Ball>();

Step 7: Add the Start method

• Implement the Start method to subscribe to the server's events:

  private void Start()
  {
      Server.PlayerConnected += OnPlayerConnected;
      Server.PlayerDisconnected += OnPlayerDisconnected;
  }

Step 8: Implement OnPlayerConnected method

• Add the OnPlayerConnected method to handle player connections and spawn a ball for the connected player:

  private void OnPlayerConnected(NetPadPlayer netPadPlayer)
  {
      SpawnBall(netPadPlayer);
  }

Step 9: Implement SpawnBall method

• Add the SpawnBall method to instantiate a ball for the connected player

• make sure to use 'NetPadPlayer.Instantiate' to properly instantiate and initialize NetPadBehaviour

  private void SpawnBall(NetPadPlayer netPadPlayer)
  {
      var ball = NetPadPlayer.Instantiate(BallPrefab, Vector3.zero, Quaternion.identity, netPadPlayer);
      m_balls[netPadPlayer] = ball;
  }

Step 10: Implement OnPlayerDisconnected method

• Add the OnPlayerDisconnected method to handle player disconnections and destroy the associated ball:

  private void OnPlayerDisconnected(NetPadPlayer netPadPlayer)
  {
      DestroyBall(netPadPlayer);
  }

Step 11: Implement DestroyBall method

• Add the DestroyBall method to remove the ball from the dictionary and destroy its GameObject:

  private void DestroyBall(NetPadPlayer netPadPlayer)
  {
      if (m_balls.TryGetValue(netPadPlayer, out var ball))
      {
          Destroy(ball.gameObject);
          m_balls.Remove(netPadPlayer);
      }
  }

Step 12: Save and return to Unity

• Save the 'BallSpawner' script in your code editor and return to the Unity editor. The script will automatically compile and be ready for use.