RoApp/Assets/Src/Plugins/Spine/Runtime/spine-unity/Components/RootMotion/SkeletonMecanimRootMotion.cs

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using UnityEngine;
using System.Collections.Generic;
using Spine.Unity.AnimationTools;

namespace Spine.Unity {

	/// <summary>
	/// Add this component to a SkeletonMecanim GameObject
	/// to turn motion of a selected root bone into Transform or RigidBody motion.
	/// Local bone translation movement is used as motion.
	/// All top-level bones of the skeleton are moved to compensate the root
	/// motion bone location, keeping the distance relationship between bones intact.
	/// </summary>
	/// <remarks>
	/// Only compatible with <c>SkeletonMecanim</c>.
	/// For <c>SkeletonAnimation</c> or <c>SkeletonGraphic</c> please use
	/// <see cref="SkeletonRootMotion">SkeletonRootMotion</see> instead.
	/// </remarks>
	public class SkeletonMecanimRootMotion : SkeletonRootMotionBase {
		#region Inspector
		const int DefaultMecanimLayerFlags = -1;
		public int mecanimLayerFlags = DefaultMecanimLayerFlags;
		#endregion

		protected Vector2 movementDelta;

		SkeletonMecanim skeletonMecanim;
		public SkeletonMecanim SkeletonMecanim {
			get {
				return skeletonMecanim ? skeletonMecanim : skeletonMecanim = GetComponent<SkeletonMecanim>();
			}
		}

		protected override void Reset () {
			base.Reset();
			mecanimLayerFlags = DefaultMecanimLayerFlags;
		}

		protected override void Start () {
			base.Start();
			skeletonMecanim = GetComponent<SkeletonMecanim>();
			if (skeletonMecanim) {
				skeletonMecanim.Translator.OnClipApplied -= OnClipApplied;
				skeletonMecanim.Translator.OnClipApplied += OnClipApplied;
			}
		}

		void OnClipApplied(Spine.Animation clip, int layerIndex, float weight,
				float time, float lastTime, bool playsBackward) {

			if (((mecanimLayerFlags & 1<<layerIndex) == 0) || weight == 0)
				return;

			var timeline = clip.FindTranslateTimelineForBone(rootMotionBoneIndex);
			if (timeline != null) {
				if (!playsBackward)
					movementDelta += weight * GetTimelineMovementDelta(lastTime, time, timeline, clip);
				else
					movementDelta -= weight * GetTimelineMovementDelta(time, lastTime, timeline, clip);
			}
		}

		protected override Vector2 CalculateAnimationsMovementDelta () {
			// Note: movement delta is not gather after animation but
			// in OnClipApplied after every applied animation.
			Vector2 result = movementDelta;
			movementDelta = Vector2.zero;
			return result;
		}
	}
}