Gizmo Utility

GizmoUtility.cs

using UnityEngine;
using System.Collections;

public class GizmoUtility {

	static GUIStyle _guiStyle;
	static GUIStyle _GuiStyle
	{
		get{
			if( _guiStyle == null )
			{
				_guiStyle = new GUIStyle();
			}
			return _guiStyle;
		}
	}
	
	public static void HandleLabel(Vector3 position, string label, float fontSize, Color color)
	{
		#if UNITY_EDITOR
		var sceneCamera =     UnityEditor.SceneView.currentDrawingSceneView.camera;
		var cameraDistance =  Vector3.Distance( sceneCamera.transform.position , position);
		GUIStyle style = _GuiStyle;
		style.normal.textColor = color;
		style.fontSize = (int)(fontSize * (512 / cameraDistance));
		
		UnityEditor.Handles.Label(position, label, style);
		#endif
	}
	public static void HandleLabel(Vector3 position, string label, float fontSize)
	{
		HandleLabel(position,label,fontSize, Gizmos.color);
	}
}