【Unity 2D アクションゲーム】② プレイヤーの作成

using UnityEngine;

public class PlayerController : MonoBehaviour
{
    public float Scale;
    public float Jump;

    [SerializeField] private float groundCheckRadius;
    [SerializeField] private float groundCheckOffsetY;
    [SerializeField] private float groundCheckDistance;
    [SerializeField] private LayerMask groundLayer;

    private Rigidbody2D rbody;
    private float axisH;
    private bool goingJump = false;

    /// <summary>
    /// Start is called before the first frame update
    /// シーンに読み込まれたときに１回だけ実行される
    /// </summary>
    private void Start()
    {
        rbody = GetComponent<Rigidbody2D>();
        transform.localScale = new Vector2(Scale, Scale);
    }

    /// <summary>
    /// Update is called once per frame
    /// 入力系の処理を記述するところ
    /// </summary>
    private void Update()
    {
        axisH = Input.GetAxisRaw("Horizontal");
        if (axisH < 0.0f)  // 左を向く
        {
            transform.localScale = new Vector2(-1 * Scale, Scale);
        }
        else if (0.0f < axisH)  // 右を向く
        {
            transform.localScale = new Vector2(Scale, Scale);
        }

        // ジャンプ
        if (Input.GetButtonDown("Jump"))
        {
            goingJump = true;
        }
    }

    /// <summary>
    /// 物理演算を使う移動系の処理を記述するところ
    /// </summary>
    private void FixedUpdate()
    {
        rbody.velocity = new Vector2(axisH * 3.0f, rbody.velocity.y);

        // ジャンプ
        if (OnGround() && goingJump)
        {
            Vector2 jumpPw = new Vector2(0, Jump);
            rbody.AddForce(jumpPw, ForceMode2D.Impulse);
            goingJump = false;
        }
    }

    /// <summary>
    /// 着地しているかどうかの判定
    /// </summary>
    /// <returns></returns>
    private bool OnGround()
    {
        return Physics2D.CircleCast((Vector2)transform.position + (groundCheckOffsetY * Vector2.up), groundCheckRadius, Vector2.down, groundCheckDistance, groundLayer);
    }

    /// <summary>
    /// CircleCastのレイを可視化(プログラムから呼んではいけない)
    /// </summary>
    private void OnDrawGizmos()
    {
        Gizmos.color = Color.green;
        Gizmos.DrawWireSphere((Vector2)transform.position + (groundCheckOffsetY * Vector2.up) + (Vector2.down * groundCheckDistance), groundCheckRadius);
    }
}