﻿/************************************************************************************

Copyright   :   Copyright 2014 Oculus VR, LLC. All Rights reserved.

Licensed under the Oculus VR Rift SDK License Version 3.2 (the "License");
you may not use the Oculus VR Rift SDK except in compliance with the License,
which is provided at the time of installation or download, or which
otherwise accompanies this software in either electronic or hard copy form.

You may obtain a copy of the License at

http://www.oculusvr.com/licenses/LICENSE-3.2

Unless required by applicable law or agreed to in writing, the Oculus VR SDK
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.

************************************************************************************/

using System;
using UnityEngine;
using System.Collections;

namespace UnitySampleAssets.Utility
{
    [Serializable]
    public class LerpControlledBob
    {
        public float BobDuration;
        public float BobAmount;
        private float offset = 0f;


        // provides the offset that can be used 
        public float Offset()
        {
            return offset;
        }


        public IEnumerator DoBobCycle()
        {

            // make the camera move down slightly
            float t = 0f;
            while (t < BobDuration)
            {
                offset = Mathf.Lerp(0f, BobAmount, t/BobDuration);
                t += Time.deltaTime;
                yield return new WaitForFixedUpdate();
            }

            // make it move back to neutral 
            t = 0f;
            while (t < BobDuration)
            {
                offset = Mathf.Lerp(BobAmount, 0f, t/BobDuration);
                t += Time.deltaTime;
                yield return new WaitForFixedUpdate();
            }
            offset = 0f;
        }
    }
}