space-shmup/Assets/__Scripts/Hero.cs

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

public class Hero : MonoBehaviour
{
    static public Hero S; 

    [Header("Set in Inspector")]
    // These fields control the movement of the ship
    public float speed = 30;
    public float rollMult = -45;
    public float pitchMult = 30;
    public float gameRestartDelay = 2f;
    public GameObject projectilePrefab;
    public float projectileSpeed = 40;
    public float firingDelay = 0.02f;

    [Header("Set Dynamically")]
    public float _shieldLevel = 1;
    // This variables holds a reference to the last triggering GameObject
    private GameObject lastTriggerGo = null;
    private bool isFiring = false;
    private float lastFiringTime = 0;

    void Awake() {
        if (S == null) {
            S = this; 
        } else {
            Debug.LogError("Hero.Awake() - Attempted to assign second Hero.S!");
        }
    }

    // Start is called before the first frame update
    void Start()
    {
        
    }

    // Update is called once per frame
    void Update()
    {
        // Pull in information from the Input class
        float xAxis = Input.GetAxis("Horizontal");
        float yAxis = Input.GetAxis("Vertical");

        // Change transform.position based on the axes
        Vector3 pos = transform.position;
        pos.x += xAxis * speed * Time.deltaTime;
        pos.y += yAxis * speed * Time.deltaTime;
        transform.position = pos;

        // Rotate the ship to make it feel more dynamic 
        transform.rotation = Quaternion.Euler(yAxis*pitchMult,xAxis*rollMult,0);
        // Allow the ship to fire
        if (Input.GetKeyDown(KeyCode.Space)) {
            isFiring = true;
        }
        lastFiringTime += Time.deltaTime;
        if (isFiring && (lastFiringTime > firingDelay)) {
            TempFire();
            lastFiringTime = 0;
        }
        if (Input.GetKeyUp(KeyCode.Space)) {
            isFiring = false;
        }
    }

    void TempFire() {
        GameObject projGO = Instantiate<GameObject>(projectilePrefab);
        projGO.transform.position = transform.position;
        Rigidbody rigidB = projGO.GetComponent<Rigidbody>();
        rigidB.velocity = Vector3.up * projectileSpeed;
    }

    void OnTriggerEnter(Collider other) {
        Transform rootT = other.gameObject.transform.root;
        GameObject go = rootT.gameObject;
        //print("Triggered: " + go.name);
        // Make sure it's not the same triggering go as last time
        if (go == lastTriggerGo) {
            return;
        }
        lastTriggerGo = go;
        if (go.tag == "Enemy") {
            shieldLevel--;
            Destroy(go);
        } else {
            print("Triggered by non-Enemy: " + go.name);
        }
    }
    public float shieldLevel {
        get {
            return(_shieldLevel);
        }
        set {
            _shieldLevel = Mathf.Min(value, 4);
            // If the shield is going to be set to less than zero
            if (value < 0) {
                Destroy(this.gameObject);
                // Tell Main.S to restart the game after a delay
                Main.S.DelayedRestart(gameRestartDelay);
            }
        }
    }
}