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123 lines
5.4 KiB
C#
123 lines
5.4 KiB
C#
// Animancer // Copyright 2020 Kybernetik //
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#pragma warning disable CS0649 // Field is never assigned to, and will always have its default value.
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using UnityEngine;
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namespace Animancer.Examples.StateMachines.Brains
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{
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/// <summary>
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/// A <see cref="CreatureState"/> which moves the creature according to their
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/// <see cref="CreatureBrain.MovementDirection"/>.
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/// </summary>
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[AddComponentMenu(Strings.MenuPrefix + "Examples/Brains - Locomotion State")]
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[HelpURL(Strings.APIDocumentationURL + ".Examples.StateMachines.Brains/LocomotionState")]
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public sealed class LocomotionState : CreatureState
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{
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/************************************************************************************************************************/
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[SerializeField] private AnimationClip _Walk;
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[SerializeField] private AnimationClip _Run;
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/************************************************************************************************************************/
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private void Update()
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{
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UpdateAnimation();
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UpdateTurning();
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}
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/************************************************************************************************************************/
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/// <summary>
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/// This method is similar to the "PlayMove" method in <see cref="Locomotion.IdleAndWalkAndRun"/>, but instead
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/// of checking <see cref="Input"/> to determine whether or not to run we are checking if the
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/// <see cref="Creature.Brain"/> says it wants to run.
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/// </summary>
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private void UpdateAnimation()
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{
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// We will play either the Walk or Run animation.
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// We need to know which animation we are trying to play and which is the other one.
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AnimationClip playAnimation, otherAnimation;
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if (Creature.Brain.IsRunning)
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{
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playAnimation = _Run;
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otherAnimation = _Walk;
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}
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else
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{
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playAnimation = _Walk;
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otherAnimation = _Run;
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}
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// Play the one we want.
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var playState = Creature.Animancer.Play(playAnimation, 0.25f);
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// If the brain wants to move slowly, slow down the animation.
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var speed = Mathf.Min(Creature.Brain.MovementDirection.magnitude, 1);
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playState.Speed = speed;
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// If the other one is still fading out, align their NormalizedTime to ensure they stay at the same
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// relative progress through their walk cycle.
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var otherState = Creature.Animancer.States[otherAnimation];
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if (otherState != null && otherState.IsPlaying)
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{
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playState.NormalizedTime = otherState.NormalizedTime;
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otherState.Speed = speed;
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}
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}
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/************************************************************************************************************************/
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private void UpdateTurning()
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{
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// Do not turn if we are not trying to move.
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var movement = Creature.Brain.MovementDirection;
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if (movement == Vector3.zero)
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return;
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// Determine the angle we want to turn towards.
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// Without going into the maths behind it, Atan2 gives us the angle of a vector in radians.
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// So we just feed in the x and z values because we want an angle around the y axis,
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// then convert the result to degrees because Transform.eulerAngles uses degrees.
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var targetAngle = Mathf.Atan2(movement.x, movement.z) * Mathf.Rad2Deg;
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// Determine how far we can turn this frame (in degrees).
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var turnDelta = Creature.Stats.TurnSpeed * Time.deltaTime;
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// Get the current rotation, move its y value towards the target, and apply it back to the Transform.
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var transform = Creature.Animancer.transform;
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var eulerAngles = transform.eulerAngles;
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eulerAngles.y = Mathf.MoveTowardsAngle(eulerAngles.y, targetAngle, turnDelta);
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transform.eulerAngles = eulerAngles;
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}
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/************************************************************************************************************************/
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/// <summary>
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/// Constantly moves the creature according to the <see cref="CreatureBrain.MovementDirection"/>.
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/// </summary>
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/// <remarks>
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/// This method is kept simple for the sake of demonstrating the animation system in this example.
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/// In a real game you would usually not set the velocity directly, but would instead use
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/// <see cref="Rigidbody.AddForce"/> to avoid interfering with collisions and other forces.
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/// </remarks>
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private void FixedUpdate()
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{
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// Get the desired direction, remove any vertical component, and limit the magnitude to 1 or less.
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// Otherwise a brain could make the creature travel at any speed by setting a longer vector.
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var direction = Creature.Brain.MovementDirection;
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direction.y = 0;
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direction = Vector3.ClampMagnitude(direction, 1);
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var speed = Creature.Stats.GetMoveSpeed(Creature.Brain.IsRunning);
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Creature.Rigidbody.velocity = direction * speed;
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}
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/************************************************************************************************************************/
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}
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}
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