sked/Assets/Spine/Runtime/spine-unity/Utility/TimelineExtensions.cs

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using UnityEngine;
using System.Collections.Generic;
using System.Collections;

namespace Spine.Unity.AnimationTools {
	public static class TimelineExtensions {

		/// <summary>Evaluates the resulting value of a TranslateTimeline at a given time.
		/// SkeletonData can be accessed from Skeleton.Data or from SkeletonDataAsset.GetSkeletonData.
		/// If no SkeletonData is given, values are computed relative to setup pose instead of local-absolute.</summary>
		public static Vector2 Evaluate (this TranslateTimeline timeline, float time, SkeletonData skeletonData = null) {
			const int PREV_TIME = -3, PREV_X = -2, PREV_Y = -1;
			const int X = 1, Y = 2;

			var frames = timeline.frames;
			if (time < frames[0]) return Vector2.zero;

			float x, y;
			if (time >= frames[frames.Length - TranslateTimeline.ENTRIES]) { // Time is after last frame.
				x = frames[frames.Length + PREV_X];
				y = frames[frames.Length + PREV_Y];
			}
			else {
				// Interpolate between the previous frame and the current frame.
				int frame = Animation.BinarySearch(frames, time, TranslateTimeline.ENTRIES);
				x = frames[frame + PREV_X];
				y = frames[frame + PREV_Y];
				float frameTime = frames[frame];
				float percent = timeline.GetCurvePercent(frame / TranslateTimeline.ENTRIES - 1,
					1 - (time - frameTime) / (frames[frame + PREV_TIME] - frameTime));

				x += (frames[frame + X] - x) * percent;
				y += (frames[frame + Y] - y) * percent;
			}

			Vector2 xy = new Vector2(x, y);
			if (skeletonData == null) {
				return xy;
			}
			else {
				var boneData = skeletonData.bones.Items[timeline.boneIndex];
				return xy + new Vector2(boneData.x, boneData.y);
			}
		}

		/// <summary>Gets the translate timeline for a given boneIndex.
		/// You can get the boneIndex using SkeletonData.FindBoneIndex.
		/// The root bone is always boneIndex 0.
		/// This will return null if a TranslateTimeline is not found.</summary>
		public static TranslateTimeline FindTranslateTimelineForBone (this Animation a, int boneIndex) {
			foreach (var timeline in a.timelines) {
				if (timeline.GetType().IsSubclassOf(typeof(TranslateTimeline)))
					continue;

				var translateTimeline = timeline as TranslateTimeline;
				if (translateTimeline != null && translateTimeline.boneIndex == boneIndex)
					return translateTimeline;
			}
			return null;
		}
	}
}