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

public class FireMissile : MonoBehaviour
{
    public GameObject missilePrefab;
    private float speed = 300;
    public AudioClip sound;
    private int count;

    // ★追加
    // 初期のショット間隔は大きくすること
    private int shotInterval = 30;

    void FixedUpdate()
    {
        if (Input.GetKey(KeyCode.Space))
        {
            count += 1;

            // ★変更
            if (count % shotInterval == 0)
            {
                GameObject missile = Instantiate(missilePrefab, transform.position, Quaternion.identity);
                Rigidbody missileRb = missile.GetComponent<Rigidbody>();
                missileRb.AddForce(transform.forward * speed);
                AudioSource.PlayClipAtPoint(sound, Camera.main.transform.position);
                Destroy(missile, 2.0f);
            }
        }
    }

    public void AddShotSpeed(int amount)
    {
        speed += amount;

        if (speed > 1000)
        {
            speed = 1000;
        }
    }

    // ★追加
    public void ReduceInterval(int amount)
    {
        shotInterval -= amount;

        // 下限の設定
        // ショット間隔をどこまで小さくするかは自由
        if(shotInterval < 5)
        {
            shotInterval = 5;
        }
    }
}

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

public class RapidFire : ItemBase
{
    private void OnTriggerEnter(Collider other)
    {
        if (other.CompareTag("Player"))
        {
            ItemGet();

            // Playerの子オブジェクトのコンポーネントを取得する（ポイント）
            // １個のアイテムゲットでどれだけショット間隔を下げるかは自由
            other.GetComponentInChildren<FireMissile>().ReduceInterval(5);
        }
    }
}