UI Systems

using UnityEngine;
using UnityEngine.UI;
using TMPro;

public class HUDController : MonoBehaviour
{
  [Header("Health")]
  public Slider healthSlider;
  public TMP_Text healthText;

  [Header("Score")]
  public TMP_Text scoreText;

  [Header("Panels")]
  public GameObject menuPanel;
  public GameObject hudPanel;

  public void UpdateHealth(float current, float max)
  {
      healthSlider.value = current / max;
      healthText.text = $"{Mathf.RoundToInt(current)}/{Mathf.RoundToInt(max)}";

      // Tint when HP is low
      healthSlider.fillRect.GetComponent<Image>().color =
          current / max < 0.3f ? Color.red : Color.green;
  }

  public void ShowMenu(bool show)
  {
      menuPanel.SetActive(show);
      hudPanel.SetActive(!show);
      Time.timeScale = show ? 0f : 1f; // Pause while the menu is open
  }

  public void UpdateScore(int score)
  {
      scoreText.text = score.ToString("N0"); // "1,280" format
  }
}

using UnityEngine;
using UnityEngine.UI;

// Attach to a World Space Canvas — HP bar over a character
public class WorldSpaceHealthBar : MonoBehaviour
{
  public Slider slider;
  public Vector3 offset = new Vector3(0, 2.5f, 0);
  public Transform target;

  Camera cam;

  void Start() => cam = Camera.main;

  void LateUpdate()
  {
      if (target == null) return;

      // Follow the character + offset
      transform.position = target.position + offset;

      // Always face the camera (billboard)
      transform.LookAt(transform.position + cam.transform.rotation * Vector3.forward,
                       cam.transform.rotation * Vector3.up);
  }

  public void SetHealth(float current, float max)
  {
      slider.value = current / max;
      // Hide when HP is full
      gameObject.SetActive(current < max);
  }
}