Positioning a GUI.Label inside a prefab

Question

I have a prefab that, at times, will be on the screen multiple times. Each prefab needs text positioned on it. I'm using GUI.Label for showing the text, how can I show it at an offset from within the prefab? I have created a script that is attached to the prefab itself and I'm drawing the label in the OnGui event. I was really hoping drawing it at 0,0 would put it at the top-left of the prefab but no such luck :(.

Any guidance here would be appreciated. I'm sure it's simple, but I didn't want to jury rig a half-measure and I couldn't find this specific information from searching.

edit --

I'm not sure I have my prefab set up correctly, it feels like it's incomplete. I don't know if I'm supposed to put a collider on it? But I don't think it technically has a size.

Here's a screenshot. The rectangular box at the top is my "team view" and the label that is painted near the bottom of the window is supposed to be showing in the dark gray bar at the upper portion of the teamview prefab.

alt text

Answer 1

Best Answer

Answer by zharik86 · Aug 29, 2014 at 06:17 AM

Simple way, it's use function WorldToScreenPoint(), which transforms position from world space into screen space. As your script is attached to prefab, for example(write on CSharp):

  void OnGUI() {
   //Use Main Camera and get position current object, but point position is pivot point
   Vector3 screenPos = Camera.main.WorldToScreenPoint(this.transform.position);
   //If pivot point current object at center, we offset it a little. For example 10
   //And size label, for example 100x50
   GUI.Label(new Rect(screenPos.x, Screen.height - screenPos.y, 100, 50), "myLabel");
  }

I hope that it will help you.

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omatase · Aug 29, 2014 at 07:42 PM 0

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Love it! That sounds like exactly what I need. I'm going to try it when I get home. Thanks @zharik86.

omatase · Aug 29, 2014 at 09:42 PM 0

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K, I tried it and something isn't working. The first thing I wanted to mention was that "this.position" doesn't exist, but this.transform.position does. I think that might be what you were meaning to put in your example. But aside from that when I use that code I get a place that is pretty dang far away from my prefab. I'm not sure if it's because my prefab doesn't have a box collider? I don't think my prefab has a size. Without a size, maybe that's the problem? I've updated my post to include a screenshot of what I'm seeing. Thanks.

zharik86 · Aug 30, 2014 at 07:42 AM 0

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Thanks, of couse, this.transform.position. It's my mistake. I use Unity 4.1.2 and Text show right. Maybe, in later versions a little on another. From your picture I see that, most likely, Screen.height didn't need to use. I update answer. Try this. Also I will check once again a code later.

P.S. Where is pivot point your gray box? Center of box or somewhere else.

omatase · Aug 30, 2014 at 01:53 PM 0

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@zharik86, Thanks for your continued help. The pivot point is in the center of the image. I tried your code but without offsetting. So I did new Rect(screenPos.x, screenPos.y, 150, 60) expecting the label to appear in the center of my box, but it appears where you see in my image in my post.

omatase · Aug 30, 2014 at 01:57 PM 0

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OH I figured it out! The y position is inverted. The y value I get needs to be Screen.height - y. so new Rect(screenPos.x, Screen.height - screenPos.y, 100, 50) positions the label at my pivot point. I can take it from that point. If you update your answer with this new information I will mark it as the correct answer. Thanks again @zharik86

Positioning a GUI.Label inside a prefab

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