Unity 打磚塊 2D 教學 (上)

下載完整可執行遊戲的專案 二合一(台幣約60元)

https://gum.co/tuwav

Player.cs

using System.Collections;
using System.Collections.Generic;
using UnityEngine;

public class Player : MonoBehaviour {

    [Header("水平移動速度")]
    public float speedX;
    Rigidbody2D playerRigidbody2D;

    void Start () {
        playerRigidbody2D = GetComponent<Rigidbody2D> ( );
 }
 
 void Update () {
        moveLeftOrRight ( );
    }

    float LeftOrRight ( ) {
        return Input.GetAxis ( "Horizontal");
        }

    void moveLeftOrRight ( ) {
        playerRigidbody2D.velocity = LeftOrRight() * new Vector2 (speedX,0 );
        }
}

Ball.cs

using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using UnityEngine.UI;

public class Ball : MonoBehaviour
    {
    public Text scoreText;
    int score;

    Rigidbody2D ballRigidbody2D;
    CircleCollider2D ballCircleCollider2D;

    [ Header ( "水平速度" )]
    public float speedX;

    [Header ( "垂直速度" )]
    public float speedY;

    #region 教學理解用 可不寫
    [Header ( "實際水平速度" )]
    public float velocityX;

    [Header ( "實際垂直速度" )]
    public float velocityY;
    #endregion

    enum tags
        {
        磚塊,
        背景
        }

    void Start ( )
        {
        ballRigidbody2D = GetComponent<Rigidbody2D> ( );
        ballCircleCollider2D = GetComponent<CircleCollider2D> ( );

        //切換成Kinematic模式
        //Uity 2018版以後不加這行的話 發球之前球會無法跟著球拍移動
        ballRigidbody2D.bodyType = RigidbodyType2D.Kinematic;

        scoreText.text = "目前分數：";
        Invoke ( "ballStart",3 );
        }

    void Update ( )
        {
        #region 教學理解用 可不寫
        velocityX = ballRigidbody2D.velocity.x;
        velocityY = ballRigidbody2D.velocity.y;
        #endregion

        if ( Input.GetKey(KeyCode.Space) )
            {
            ballStart ( );
            }
        }

    void ballStart ( ) {
        if ( isStop ( ) )
            {
            ballCircleCollider2D.enabled = true;
            transform.SetParent ( null );
            ballRigidbody2D.velocity = new Vector2 ( speedX , speedY );
            
            //Unity 2018以後的版本需要加下面這行：
            //改回預設的Dynamic，使用Unity內建的物理運動規則
            ballRigidbody2D.bodyType = RigidbodyType2D.Dynamic;
            }
        }

    bool isStop ( ) {
        return ballRigidbody2D.velocity == Vector2.zero;
        }

    void OnCollisionEnter2D ( Collision2D other )
        {
        lockSpeed ( );
        if ( other.gameObject.CompareTag ( tags.磚塊.ToString ( ) ) )
            {
            other.gameObject.SetActive ( false );
            score += 10;
            scoreText.text = "目前分數：" + score;
            }
        }
    
    void lockSpeed ( )
        {
        Vector2 lockSpeed = new Vector2 ( resetSpeedX ( ) , resetSpeedY ( ) );
        ballRigidbody2D.velocity = lockSpeed;
        }

    float resetSpeedX ( )
        {
        float currentSpeedX = ballRigidbody2D.velocity.x;
        if ( currentSpeedX < 0 )
            {
            return -speedX;
            }
        else
            {
            return speedX;
            }
        }

    float resetSpeedY ( )
        {
        float currentSpeedY = ballRigidbody2D.velocity.y;
        if ( currentSpeedY < 0 )
            {
            return -speedY;
            }
        else
            {
            return speedY;
            }
        }
    }

下集的程式碼：
http://www.morningfungame.com/2017/07/Unity-Arkanoid-breakout-tutorial-2D-2.html