CrowdControl/Assets/Plugins/Animancer/Examples/09 Animator Controllers/02 3D Game Kit/States/IdleState.cs

// Animancer // Copyright 2020 Kybernetik //

#pragma warning disable CS0649 // Field is never assigned to, and will always have its default value.

using System;
using UnityEngine;

namespace Animancer.Examples.AnimatorControllers.GameKit
{
    /// <summary>
    /// A <see cref="CreatureState"/> which keeps the creature standing still.
    /// </summary>
    [AddComponentMenu(Strings.MenuPrefix + "Examples/Game Kit - Idle State")]
    [HelpURL(Strings.APIDocumentationURL + ".Examples.AnimatorControllers.GameKit/IdleState")]
    public sealed class IdleState : CreatureState
    {
        /************************************************************************************************************************/

        [SerializeField] private ClipState.Transition _MainAnimation;
        [SerializeField] private float _FirstRandomizeDelay = 5;
        [SerializeField] private float _MinRandomizeInterval = 0;
        [SerializeField] private float _MaxRandomizeInterval = 20;
        [SerializeField] private ClipState.Transition[] _RandomAnimations;

        private float _RandomizeTime;

        // _RandomizeDelay was originally handled by the PlayerController (Idle Timeout).
        // The min and max interval were handled by the RandomStateSMB on the Idle state in IdleSM.

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

        private void Awake()
        {
            Action onEnd = PlayMainAnimation;
            for (int i = 0; i < _RandomAnimations.Length; i++)
            {
                _RandomAnimations[i].Events.Sequence.OnEnd = onEnd;

                // We could just do `OnEnd = PlayMainAnimation` instead of declaring the delegate first, but that
                // assignment is actually shorthand for `new Action(PlayMainAnimation)` which would create a new
                // delegate object for each animation. This way all animations just share the same object.
            }
        }

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

        public override bool CanEnterState(CreatureState previousState)
        {
            return Creature.CharacterController.isGrounded;
        }

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

        private void OnEnable()
        {
            PlayMainAnimation();
            _RandomizeTime += _FirstRandomizeDelay;
        }

        private void PlayMainAnimation()
        {
            _RandomizeTime = UnityEngine.Random.Range(_MinRandomizeInterval, _MaxRandomizeInterval);
            Creature.Animancer.Play(_MainAnimation);
        }

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

        private void FixedUpdate()
        {
            if (Creature.CheckMotionState())
                return;

            Creature.UpdateSpeedControl();

            // We use time where Mecanim used normalized time because choosing a number of seconds is much simpler than
            // finding out how long the animation is and working with multiples of that value.
            if (Creature.Animancer.States.Current == _MainAnimation.State &&
                Creature.Animancer.States.Current.Time >= _RandomizeTime)
            {
                PlayRandomAnimation();
            }
        }

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

        private void PlayRandomAnimation()
        {
            var index = UnityEngine.Random.Range(0, _RandomAnimations.Length);
            var animation = _RandomAnimations[index];
            Creature.Animancer.Play(animation);
        }

        /************************************************************************************************************************/
    }
}