gladiator/BossUI.cs at main · austin-weeks/gladiator · GitHub

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using DG.Tweening;
using UnityEngine;
using UnityEngine.UI;

public class BossUI: MonoBehaviour {
    [SerializeField] Image healthBar;
    CanvasGroup canvasGroup;
    Tweener healthBarTween;
    int startHealth;
    void Awake() {
        canvasGroup = GetComponent<CanvasGroup>();
        canvasGroup.alpha = 0f;
        canvasGroup.interactable = false;
        canvasGroup.blocksRaycasts = false;
        healthBar.fillAmount = 0f;

        WaveManager.I.OnBossSpawned += OnBossSpawned;
    }

    void OnBossSpawned() {
        startHealth = Boss.I.Health.HP;
        Boss.I.Health.OnDied += Hide;
        Boss.I.Health.OnDamage += OnDamage;

        Player.I.Health.OnDied += Hide;

        Show();
    }

    async void Show() {
        canvasGroup.DOFade(1f, 0.5f).SetEase(Ease.InOutSine);
        await healthBar.DOFillAmount(1f, 1.5f).SetEase(Ease.Linear).AsyncWaitForCompletion();

        healthBarTween = healthBar.DOFillAmount(HealthFill, 0.2f).SetEase(Ease.InOutQuad).SetAutoKill(false);
    }

    void OnDamage() {
        if (healthBarTween == null) return;
        healthBarTween.ChangeValues(healthBar.fillAmount, HealthFill, 0.2f).Play();
    }

    void Hide() {
        healthBarTween.Kill(true);
        canvasGroup.DOFade(0f, 0.5f);
    }

    float HealthFill => (float)Boss.I.Health.HP / (float)startHealth;
}