CrowdControl/Assets/Feel/MMTools/Tools/MMAnimation/MMOffsetAnimation.cs

using UnityEngine;
using System.Collections;

namespace MoreMountains.Tools
{
	/// <summary>
	/// Use this class to offset an animation by a random range
	/// </summary>
	[RequireComponent(typeof(Animator))]
	[AddComponentMenu("More Mountains/Tools/Animation/MMOffsetAnimation")]
	public class MMOffsetAnimation : MonoBehaviour
	{
		/// the minimum amount (in seconds) by which to offset the animation
		public float MinimumRandomRange = 0f;
		/// the maximum amount (in seconds) by which to offset the animation
		public float MaximumRandomRange = 1f;
		/// the layer to affect
		public int AnimationLayerID = 0;
		/// whether or not to apply that offset on Start
		public bool OffsetOnStart = true;
		/// whether or not to offset animation on enable
		public bool OffsetOnEnable = false;
		/// whether or not to self disable after offsetting
		public bool DisableAfterOffset = true;

		protected Animator _animator;
		protected AnimatorStateInfo _stateInfo;

		/// <summary>
		/// On awake we store our animator
		/// </summary>
		protected virtual void Awake()
		{
			_animator = this.gameObject.GetComponent<Animator>();
		}

		/// <summary>
		/// On Start we offset our animation
		/// </summary>
		protected virtual void Start()
		{
			if (!OffsetOnStart)
			{
				return;
			}
			OffsetCurrentAnimation();
		}

		/// <summary>
		/// On Enable we offset our animation if needed
		/// </summary>
		protected virtual void OnEnable()
		{
			if (!OffsetOnEnable)
			{
				return;
			}
			OffsetCurrentAnimation();
		}

		/// <summary>
		/// offsets the target animation
		/// </summary>
		public virtual void OffsetCurrentAnimation()
		{
			_stateInfo = _animator.GetCurrentAnimatorStateInfo(AnimationLayerID);
			_animator.Play(_stateInfo.fullPathHash, -1, Random.Range(MinimumRandomRange, MaximumRandomRange));
			if (DisableAfterOffset)
			{
				this.enabled = false;
			}
		}
	}
}