//----------------------------------------------
// NGUI: Next-Gen UI kit
// Copyright © 2011-2012 Tasharen Entertainment
//----------------------------------------------
using UnityEngine;
/// <summary>
/// Tween the object's position on circle.
/// </summary>
[AddComponentMenu("NGUI/Tween/CirclePosition")]
public class TweenCirclePosition : UITweener
{
public Vector3 from;
public Vector3 to;
[Range(0,360)]
public float angleMax = 180;
Transform mTrans;
public Transform cachedTransform { get { if (mTrans == null) mTrans = transform; return mTrans; } }
public Vector3 position { get { return cachedTransform.localPosition; } set { cachedTransform.localPosition = value; } }
private Vector3 cachedFrom;
private Vector3 cachedTo;
private Vector3 cachedCenter;
private Vector3 cachedDirection;
private readonly Vector3 Z
= new Vector3
(0,
0,
-1);
override protected void OnUpdate(float factor, bool isFinished)
{
if (cachedTo != to || cachedFrom != from)
{
cachedDirection = (to - from) * 0.5F;
cachedCenter = from + cachedDirection; //center between from and to
cachedFrom = from;
cachedTo = to;
cachedDirection *= -1; //inverse direction for start begin at From
}
cachedTransform.localPosition = (Quaternion.AngleAxis(((1F - factor) * angleMax), Z) * cachedDirection) + cachedCenter;
}
public void setByRadius(Vector3 begin, Vector3 direction, float radius)
{
to = direction * 2 * radius + begin;
from = begin;
}
public void setByPosition(Vector3 from,Vector3 to)
{
this.from = from;
this.to = to;
}
public void setByCenter(Vector3 center, float radius)
{
from = center;
to = center;
from.y += radius;
to.y -= radius;
}
/// <summary>
/// Start the tweening operation.
/// </summary>
static public TweenCirclePosition Begin(GameObject go, float duration, Vector3 pos)
{
TweenCirclePosition comp = UITweener.Begin<TweenCirclePosition>(go, duration);
comp.from = comp.position;
comp.to = pos;
if (duration <= 0f)
{
comp.Sample(1f, true);
comp.enabled = false;
}
return comp;
}
}
