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Spine Runtime for libGDX
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/******************************************************************************
 * Spine Runtimes License Agreement
 * Last updated September 24, 2021. Replaces all prior versions.
 *
 * Copyright (c) 2013-2021, Esoteric Software LLC
 *
 * Integration of the Spine Runtimes into software or otherwise creating
 * derivative works of the Spine Runtimes is permitted under the terms and
 * conditions of Section 2 of the Spine Editor License Agreement:
 * http://esotericsoftware.com/spine-editor-license
 *
 * Otherwise, it is permitted to integrate the Spine Runtimes into software
 * or otherwise create derivative works of the Spine Runtimes (collectively,
 * "Products"), provided that each user of the Products must obtain their own
 * Spine Editor license and redistribution of the Products in any form must
 * include this license and copyright notice.
 *
 * THE SPINE RUNTIMES ARE PROVIDED BY ESOTERIC SOFTWARE LLC "AS IS" AND ANY
 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED. IN NO EVENT SHALL ESOTERIC SOFTWARE LLC BE LIABLE FOR ANY
 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES,
 * BUSINESS INTERRUPTION, OR LOSS OF USE, DATA, OR PROFITS) HOWEVER CAUSED AND
 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 * THE SPINE RUNTIMES, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 *****************************************************************************/

package com.esotericsoftware.spine;

import com.badlogic.gdx.utils.ObjectFloatMap;

import com.esotericsoftware.spine.AnimationState.TrackEntry;

/** Stores mix (crossfade) durations to be applied when {@link AnimationState} animations are changed. */
public class AnimationStateData {
	final SkeletonData skeletonData;
	final ObjectFloatMap animationToMixTime = new ObjectFloatMap(51, 0.8f);
	final Key tempKey = new Key();
	float defaultMix;

	public AnimationStateData (SkeletonData skeletonData) {
		if (skeletonData == null) throw new IllegalArgumentException("skeletonData cannot be null.");
		this.skeletonData = skeletonData;
	}

	/** The SkeletonData to look up animations when they are specified by name. */
	public SkeletonData getSkeletonData () {
		return skeletonData;
	}

	/** Sets a mix duration by animation name.
	 * 
	 * See {@link #setMix(Animation, Animation, float)}. */
	public void setMix (String fromName, String toName, float duration) {
		Animation from = skeletonData.findAnimation(fromName);
		if (from == null) throw new IllegalArgumentException("Animation not found: " + fromName);
		Animation to = skeletonData.findAnimation(toName);
		if (to == null) throw new IllegalArgumentException("Animation not found: " + toName);
		setMix(from, to, duration);
	}

	/** Sets the mix duration when changing from the specified animation to the other.
	 * 
	 * See {@link TrackEntry#mixDuration}. */
	public void setMix (Animation from, Animation to, float duration) {
		if (from == null) throw new IllegalArgumentException("from cannot be null.");
		if (to == null) throw new IllegalArgumentException("to cannot be null.");
		Key key = new Key();
		key.a1 = from;
		key.a2 = to;
		animationToMixTime.put(key, duration);
	}

	/** Returns the mix duration to use when changing from the specified animation to the other, or the {@link #getDefaultMix()} if
	 * no mix duration has been set. */
	public float getMix (Animation from, Animation to) {
		if (from == null) throw new IllegalArgumentException("from cannot be null.");
		if (to == null) throw new IllegalArgumentException("to cannot be null.");
		tempKey.a1 = from;
		tempKey.a2 = to;
		return animationToMixTime.get(tempKey, defaultMix);
	}

	/** The mix duration to use when no mix duration has been defined between two animations. */
	public float getDefaultMix () {
		return defaultMix;
	}

	public void setDefaultMix (float defaultMix) {
		this.defaultMix = defaultMix;
	}

	static class Key {
		Animation a1, a2;

		public int hashCode () {
			return 31 * (31 + a1.hashCode()) + a2.hashCode();
		}

		public boolean equals (Object obj) {
			if (this == obj) return true;
			if (obj == null) return false;
			Key other = (Key)obj;
			if (a1 == null) {
				if (other.a1 != null) return false;
			} else if (!a1.equals(other.a1)) return false;
			if (a2 == null) {
				if (other.a2 != null) return false;
			} else if (!a2.equals(other.a2)) return false;
			return true;
		}

		public String toString () {
			return a1.name + "->" + a2.name;
		}
	}
}