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Assets/CoolapeFrame/3rd/NGUI_Enhance/Examples/Scripts/Other/LagPosition.cs

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+using UnityEngine;
+
+/// <summary>
+/// Attach to a game object to make its position always lag behind its parent as the parent moves.
+/// </summary>
+
+public class LagPosition : MonoBehaviour
+{
+	public Vector3 speed = new Vector3(10f, 10f, 10f);
+	public bool ignoreTimeScale = false;
+
+	Transform mTrans;
+	Vector3 mRelative;
+	Vector3 mAbsolute;
+	bool mStarted = false;
+
+	public void OnRepositionEnd ()
+	{
+		Interpolate(1000f);
+	}
+
+	void Interpolate (float delta)
+	{
+		Transform parent = mTrans.parent;
+
+		if (parent != null)
+		{
+			Vector3 target = parent.position + parent.rotation * mRelative;
+			mAbsolute.x = Mathf.Lerp(mAbsolute.x, target.x, Mathf.Clamp01(delta * speed.x));
+			mAbsolute.y = Mathf.Lerp(mAbsolute.y, target.y, Mathf.Clamp01(delta * speed.y));
+			mAbsolute.z = Mathf.Lerp(mAbsolute.z, target.z, Mathf.Clamp01(delta * speed.z));
+			mTrans.position = mAbsolute;
+		}
+	}
+
+	void Awake () { mTrans = transform; }
+	void OnEnable () { if (mStarted) ResetPosition(); }
+	void Start () { mStarted = true; ResetPosition(); }
+
+	public void ResetPosition ()
+	{
+		mAbsolute = mTrans.position;
+		mRelative = mTrans.localPosition;
+	}
+
+	void Update ()
+	{
+		Interpolate(ignoreTimeScale ? RealTime.deltaTime : Time.deltaTime);
+	}
+}