Making healthbar follow enemy gameobject

Question

Hi, I'm trying to set up a health bar system for a 2D game made in 3D engine. X is horizontal and Z is vertical. I have most of it working, but I can't get the enemy health bar to follow the enemy. This is my code: (C#)

 void OnGUI(){
     Vector3 targetPos = Camera.main.WorldToScreenPoint(transform.position);
 
 
         GUI.DrawTexture(new Rect(targetPos.x -30, targetPos.z, 60, 20), background);
         GUI.Box(new Rect (targetPos.x -30, targetPos.z, 60, 20), curHealth + "/"    + maxHealth);
     }

It's OK on the X axis, but on the Z axis the healthbar just stays at the top of the screen. I've probably spent 10-15 hours googling for answers and trying things that haven't worked out. I'm sure it's a tiny thing I'm doing wrong, but I'm a complete noob and can't figure it out. Greatly appreciate any help.

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Answer by robertbu · Aug 17, 2014 at 08:36 AM

GUI uses GUI coordinates, not screen coordinates. GUI coordinates start in the upper left corner, screen coordinates start in the lower right. So at line 3 do:

 targetPos.y = Screen.height - targetPos.y;

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Jimmy_P · Aug 17, 2014 at 08:47 AM 0

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I had tried that previously, except I used targetPos.z since I'm only using X and Z axes. Using the Y axis works, and I hope one day to understand why. Hopefully this will be the last lesson I need about assumptions.. Thanks a lot!

Making healthbar follow enemy gameobject

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