add

Assets/CoolapeFrame/3rd/NGUI_Enhance/HUD Text/Examples/Scripts/HUDRoot.cs

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+//--------------------------------------------
+//            NGUI: HUD Text
+// Copyright © 2012 Tasharen Entertainment
+//--------------------------------------------
+
+using UnityEngine;
+
+[AddComponentMenu("NGUI/Examples/HUD Root")]
+public class HUDRoot : MonoBehaviour
+{
+	static public GameObject go;
+	void Awake () { go = gameObject; }
+}

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Assets/CoolapeFrame/3rd/NGUI_Enhance/HUD Text/Examples/Scripts/HUDTest.cs

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+using UnityEngine;
+using System.Collections;
+
+public class HUDTest : UIEventListener {
+	
+	public Transform hudAnchor;
+	public Camera mGameCamera;
+	public Camera mUICamera;
+	public HUDText prefHudtxt;
+	
+	HUDText hudtxt;
+	
+	// Use this for initialization
+	void Start () {
+		if(hudtxt == null) {
+			hudtxt = Object.Instantiate(prefHudtxt) as HUDText;
+			hudtxt.transform.parent = HUDRoot.go.transform;
+			hudtxt.transform.localScale = Vector3.one;
+			hudtxt.transform.localPosition = Vector3.zero;
+			UIFollowTarget ft = hudtxt.gameObject.AddComponent<UIFollowTarget>();
+			ft.target = hudAnchor;
+			ft.setCamera(mGameCamera, mUICamera);
+			hudtxt.Add("Please click the cube...", Color.white, -1);	//最后一个参数:-1 表示常驻
+		}
+	}
+	
+	
+	void OnClick() {
+		if(hudtxt == null) {
+			Start ();
+		}
+		hudtxt.Add(1, Color.red, 1);
+	}
+	
+	void OnDrag(Vector2 delta) {
+		Vector3 off = new Vector3(delta.x, delta.y, 0);
+		transform.localPosition += (off*0.01f);
+	}
+}

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