NGUI研究院之为什么Scene视图中不显示Polygon Collider2D（十七）

using UnityEngine;
using System.Collections;
using UnityEditor;

public class NewBehaviourScript : Editor {

	[MenuItem ("NGUI/Attach/PolygonCollider2D")]
	static void AddPolygonCollider2D () 
	{
		if(Selection.activeObject != null)
		{
			foreach(GameObject go in Selection.gameObjects)
			{
				UIWidget widget = go.GetComponent<UIWidget>();
				if(widget != null)
				{
					PolygonCollider2D polygonCollider = 	go.GetComponent<PolygonCollider2D>();
					if(polygonCollider == null)
					{
						 polygonCollider = 	go.AddComponent<PolygonCollider2D>();
					}
					Vector2 []vectors = new Vector2[4]; 
					int widthHalf = (widget.width >>1) + 20;
					int heightHalf = (widget.height >>1) + 20;
					vectors[0] = new Vector2 (-widthHalf,-heightHalf);
					vectors[1] = new Vector2 (widthHalf,-heightHalf);
					vectors[2] = new Vector2 (widthHalf,heightHalf);
					vectors[3] = new Vector2 (-widthHalf,heightHalf);
					polygonCollider.points = vectors;
				}
			}
		}
	}
}