healthbar color.lerp issue

Question

I'm trying to make my healthbar turn color the more damage it gets (green -> yellow -> red), but for some reason the healthbar vanishes when my enemies are being hit :/ The code works fine, beside the coloring stuff in void TakeDamage(float amt). If I comment out the coloring part of the code, then my healthbar works without issues.

 using UnityEngine;
 using System.Collections;
 using UnityEngine.UI;
 
 public class EnemyHealth : MonoBehaviour {
     
     public float hitPoints = 100f;
     public float currentHitPoints;
     public GameObject destroyFX;
     public Image healthbar;
 
     public Color32 startColor;
     public Color32 middleColor;
     public Color32 endColor;
 
     void Start () {
         currentHitPoints = hitPoints;
     }
     
     void TakeDamage(float amt) {
         currentHitPoints -= amt;
 
         
         float healthCalc = currentHitPoints / hitPoints; 
         setHealthbar(healthCalc);
 
         if (healthCalc < 0.1f) {
             healthbar.color = Color.Lerp(endColor, middleColor, healthCalc * 2);
         }
         else {
             healthbar.color = Color.Lerp(middleColor, startColor, (healthCalc - 0.5f) * 2);
         }
 
         if (currentHitPoints <=0) {
             currentHitPoints = 0;
             Die();
         }
     }
     
     void Die() {
         if(gameObject.tag == "Enemy") {
             Instantiate(destroyFX, this.transform.position, this.transform.rotation); 
             Destroy (gameObject);
         }
     }
 
     public void setHealthbar (float enemyHealth) {
         healthbar.transform.localScale = new Vector3(enemyHealth, healthbar.transform.localScale.y, healthbar.transform.localScale.z);
     }
 
 }

Answer 1

Answer by joemane22 · Nov 14, 2015 at 06:38 AM

The only problem I see is in

 healthbar.color = Color.Lerp(middleColor, startColor, (healthCalc - 0.5f) * 2);

If healthCalc is less than 0.5 than the result will be negative and won't give you the desired results. Instead do

 healthbar.color = Color.Lerp(middleColor, startColor, Mathf.Clamp01(healthCalc - 0.5f) * 2);

That way the result will either be zero or positive. Hope that fixes your issue.

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johnniks · Nov 14, 2015 at 09:50 PM 0

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That didn't work :( the healthbar still vanished into thin air whenever the gameobject is hit... but the healthbar works fine without the color code >_>

joemane22 johnniks · Nov 15, 2015 at 09:15 PM 0

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Well, you will have to do some debugging. Run your game and when the healthbar disappears pause the game. Right click on the inspector tab at the top of the inspector and change it to debug view so you can see all the variables. Check the scale variables, the color and so on. $$anonymous$$ake sure you check alpha levels on the colors as well. At least find what the culprit is so you can focus on seeing what went wrong.

johnniks joemane22 · Nov 15, 2015 at 09:30 PM 0

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I'm guessting the issue is that I need to put my float healthCalc and my if-statement (healthCalc < 0.1f) {...} down into the public void setHealthbar (and the color code). But I don't know how to change setHealth (float enemyHealth) {...} into something where I don't need the float enemyHealth, or else I won't be able to call it with setHealth(); in void TakeDamage, because it shouldn't have a set value e.g. setHealth(0.0f); but I'm not a great programmer, so I really don't know how to go about doing that :(

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healthbar color.lerp issue

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