シューティングチュートリアルをUnity5で(第11回)

この回の操作が最大の難関だった。混乱した時に元に戻せるよう、Gitなどでのバージョン管理を推奨。SceneのSaveだとスクリプトは戻らないので不足。

11.1　HP（ヒットポイント）と攻撃力（power）の実装

特記事項なし

using UnityEngine;
using System.Collections;

public class Enemy : MonoBehaviour {
    public int hp = 1;
    Spaceship spaceship;
    private Transform tran;

    void Start () {
        spaceship = GetComponent<Spaceship> ();
        tran = GetComponent<Transform> ();
        Move (tran.up * -1);

        StartCoroutine ("IE");
    }

    IEnumerator IE() {
        if (spaceship.canShot == false) {
            yield break;
        }

        while (true) {
            for (int i = 0; i < tran.childCount; i++) {
                Transform shotPosition = transform.GetChild (i);
                spaceship.Shot (shotPosition);
            }
            yield return new WaitForSeconds (spaceship.shotDelay);
        }
    }

    public void Move(Vector2 direction)
    {
        Rigidbody2D rb2 = GetComponent<Rigidbody2D> ();
        rb2.velocity = direction * spaceship.speed;
    }

    void OnTriggerEnter2D(Collider2D c)
    {
        string layerName = LayerMask.LayerToName (c.gameObject.layer);

        if (layerName != "Bullet(Player)")
            return;

        Destroy (c.gameObject);
        spaceship.Explosion ();
        Destroy (gameObject);
    }
}

特記事項なし(チュートリアルだとlifeTImeの初期値が第5回の5から1に変更されているが、これだと敵の弾が空中で消えてしまうので変えない方が良い)

using UnityEngine;
using System.Collections;

public class Bullet : MonoBehaviour {
    public int speed = 10;
    public float lifeTime = 5;
    public int power = 1; //追加箇所
    private Rigidbody2D rb2;

    void Start () {
        rb2 = GetComponent<Rigidbody2D>();
        rb2.velocity = transform.up * speed;
        Destroy (gameObject, lifeTime);
    }
}

ヒットポイントが0になった時に爆発させる

特記事項なし

using UnityEngine;
using System.Collections;

public class Enemy : MonoBehaviour {
    public int hp = 1;
    Spaceship spaceship;
    private Transform tran;

    void Start () {
        spaceship = GetComponent<Spaceship> ();
        tran = GetComponent<Transform> ();
        Move (tran.up * -1);

        StartCoroutine ("IE");
    }

    IEnumerator IE() {
        if (spaceship.canShot == false) {
            yield break;
        }

        while (true) {
            for (int i = 0; i < tran.childCount; i++) {
                Transform shotPosition = transform.GetChild (i);
                spaceship.Shot (shotPosition);
            }
            yield return new WaitForSeconds (spaceship.shotDelay);
        }
    }

    public void Move(Vector2 direction)
    {
        Rigidbody2D rb2 = GetComponent<Rigidbody2D> ();
        rb2.velocity = direction * spaceship.speed;
    }

    void OnTriggerEnter2D(Collider2D c)
    {
        string layerName = LayerMask.LayerToName (c.gameObject.layer);

        if (layerName != "Bullet(Player)")
            return;

        Transform playerBulletTransform = c.transform.parent;
        Bullet bullet = playerBulletTransform.GetComponent<Bullet> ();

        hp = hp - bullet.power;

        Destroy (c.gameObject);

        if (hp <= 0) {
            spaceship.Explosion ();
            Destroy (gameObject);
        }
    }
}