How to Make Video Games 2
In this part we will create a Sound Manager which will hold and play our sound effects. We will also write the C# code required to make our ball ricochet off of paddles, walls and goals.
Because many people asked I will also use the Windows version of Unity in this tutorial and show you how to create our sprites using Gimp. This tutorial series isn’t just about Pong. I will make numerous other games including games like Space Invaders, Pacman, Tetris, Mario and others. If there is a 2D game you’d like to see tell me and I’ll see what I can do.
I’ll finish Pong in the next video and will cover the following topics : Collision Detection, Animation, AI Controlled Competitors, Physics, Keyboard Input, Unity User Interfaces, Splash Screens, Sound Effects, Background Music, Build Settings and more.
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Code From the Tutorial
Ball.cs
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using System.Collections; using System.Collections.Generic; using UnityEngine; public class Ball : MonoBehaviour { // Balls default movement speed public float speed = 30; // The balls Rigidbody component private Rigidbody2D rigidBody; // Used to play sound effects private AudioSource audioSource; // Use this for initialization void Start () { // Get reference to the ball Rigidbody rigidBody = GetComponent<Rigidbody2D>(); // When the ball is created move it to // the right (1,0) at the desired speed rigidBody.velocity = Vector2.right * speed; } // Called every time a ball collides with something // the object it hit is passed as a parameter void OnCollisionEnter2D(Collision2D col) { // If the LeftPaddle or RightPaddle hit the // ball simulate the ricochet if ((col.gameObject.name == "LeftPaddle") || (col.gameObject.name == "RightPaddle")) { HandlePaddleHit(col); } // WallBottom or WallTop if ((col.gameObject.name == "WallBottom") || (col.gameObject.name == "WallTop")) { // Play the sound effect SoundManager.Instance.PlayOneShot(SoundManager.Instance.wallBloop); } // LeftGoal or RightGoal if ((col.gameObject.name == "LeftGoal") || (col.gameObject.name == "RightGoal")) { // Play the sound effect SoundManager.Instance.PlayOneShot(SoundManager.Instance.goalBloop); // TODO Update Score UI // Move the ball to the center of the screen transform.position = new Vector2(0, 0); } } void HandlePaddleHit(Collision2D col) { // Find y for the ball vector based // on where the ball hit the paddle // Above the center y angles up // Below the center y angles down float y = BallHitPaddleWhere(transform.position, col.transform.position, col.collider.bounds.size.y); // Vector ball moves to Vector2 dir = new Vector2(); // Go left or right on the x axis // depending on which panel was hit if(col.gameObject.name == "LeftPaddle") { dir = new Vector2(1, y).normalized; } if (col.gameObject.name == "RightPaddle") { dir = new Vector2(-1, y).normalized; } // Change the velocity / direction of ball // You assign a vector to velocity rigidBody.velocity = dir * speed; // Play sound effect SoundManager.Instance.PlayOneShot(SoundManager.Instance.hitPaddleBloop); } // Find y for the ball vector based // on where the ball hit the paddle float BallHitPaddleWhere(Vector2 ball, Vector2 paddle, float paddleHeight) { return (ball.y - paddle.y) / paddleHeight; } } |
SoundManager.cs
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using System.Collections; using System.Collections.Generic; using UnityEngine; public class SoundManager : MonoBehaviour { // Holds the single instance of the SoundManager // that can be accessed from any other script public static SoundManager Instance = null; // Will hold the sound effects public AudioClip goalBloop; public AudioClip lossBuzz; public AudioClip hitPaddleBloop; public AudioClip winSound; public AudioClip wallBloop; // Refers to the AudioSource added to // SoundManager to play sound effects private AudioSource soundEffectAudio; // Use this for initialization void Start () { // This is a singleton that makes sure you only // ever have one SoundManager // If someone tries to create another destroy it if (Instance == null) { Instance = this; } else if(Instance != this) { Destroy(gameObject); } /* YOU ACTUALLY DON'T NEED THIS AudioSource[] sources = GetComponents<AudioSource>(); foreach(AudioSource source in sources) { if(source.clip == null) { soundEffectAudio = source; } } */ // Use this instead AudioSource theSource = GetComponent<AudioSource> (); soundEffectAudio = theSource; } // Any script can call this to play a sound effect public void PlayOneShot(AudioClip clip) { soundEffectAudio.PlayOneShot(clip); } } |
MovePaddle.cs
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using System.Collections; using System.Collections.Generic; using UnityEngine; public class MovePaddle : MonoBehaviour { // Speed paddles move public float speed = 30; // Called each time the frame updates // but this is used instead of update // when using Rigidbody void FixedUpdate() { // Check to see if keys associated with // vertical movement is being pressed float vertPress = Input.GetAxisRaw("Vertical"); // Move the paddle in the y direction // depending on the keys pressed and // the desired speed GetComponent<Rigidbody2D>().velocity = new Vector2(0, vertPress) * speed; } // Use this for initialization void Start () { } // Update is called once per frame void Update () { } } |
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