Health.cs

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using UnityEngine;
using UnityEngine.UI;
using System.Collections;
using UnityEngine.SceneManagement;

public class Health : MonoBehaviour
{
    public const int maxHealth = 20;
    public int currentHealth = maxHealth;
    public RectTransform healthbar;


    [SerializeField]
    private float fillAmount;

    [SerializeField]
    private Image Content;

    void Update(){
        HandleBar ();
    }

    private void HandleBar(){
        Content.fillAmount = Map(currentHealth, 0, maxHealth, 0, 1);
    }

    private float Map(float value, float inMin, float inMax, float outMin, float outMax)
    {
        return (value - inMin) * (outMax - outMin) / (inMax - inMin) + outMin;
    }

    public void TakeDamage(int amount)
    {
        currentHealth -= amount;
        if (currentHealth <= 0)
        {
            currentHealth = 0;
            Debug.Log("Dead!");
            //Destroy(GameObject.FindGameObjectWithTag("tankObject"));
            SceneManager.LoadScene (SceneManager.GetActiveScene ().name);
        }

        //healthbar.sizeDelta = new Vector2 (currentHealth, healthbar.sizeDelta.y);
    }// end take damage function
        

}