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Assets/Spine/Runtime/spine-unity/Modules/SkeletonUtility Modules/SkeletonUtilityKinematicShadow.cs

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+/******************************************************************************
+ * Spine Runtimes License Agreement
+ * Last updated May 1, 2019. Replaces all prior versions.
+ *
+ * Copyright (c) 2013-2019, 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.
+ *
+ * THIS SOFTWARE IS 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 THIS SOFTWARE,
+ * EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *****************************************************************************/
+
+using UnityEngine;
+using System.Collections.Generic;
+
+namespace Spine.Unity.Modules {
+	
+	// SkeletonUtilityKinematicShadow allows hinge chains to inherit a velocity interpreted from changes in parent transform position or from unrelated rigidbodies.
+	// Note: Uncheck "useRootTransformIfNull
+	public class SkeletonUtilityKinematicShadow : MonoBehaviour {
+		#region Inspector
+		[Tooltip("If checked, the hinge chain can inherit your root transform's velocity or position/rotation changes.")]
+		public bool detachedShadow = false;
+		public Transform parent;
+		public bool hideShadow = true;
+		public PhysicsSystem physicsSystem = PhysicsSystem.Physics3D;
+		#endregion
+
+		GameObject shadowRoot;
+		readonly List<TransformPair> shadowTable = new List<TransformPair>();
+		struct TransformPair {
+			public Transform dest, src;
+		}
+
+		public enum PhysicsSystem {
+			Physics2D,
+			Physics3D
+		};
+
+		void Start () {
+			// Duplicate this gameObject as the "shadow" with a different parent.
+			shadowRoot = Instantiate<GameObject>(this.gameObject);
+			Destroy(shadowRoot.GetComponent<SkeletonUtilityKinematicShadow>());
+
+			// Prepare shadow gameObject's properties.
+			var shadowRootTransform = shadowRoot.transform;
+			shadowRootTransform.position = transform.position;
+			shadowRootTransform.rotation = transform.rotation;
+
+			Vector3 scaleRef = transform.TransformPoint(Vector3.right);
+			float scale = Vector3.Distance(transform.position, scaleRef);
+			shadowRootTransform.localScale = Vector3.one;
+
+			if (!detachedShadow) {
+				// Do not change to null coalescing operator (??). Unity overloads null checks for UnityEngine.Objects but not the ?? operator.
+				if (parent == null)
+					shadowRootTransform.parent = transform.root;  
+				else
+					shadowRootTransform.parent = parent;
+			}
+
+			if (hideShadow)
+				shadowRoot.hideFlags = HideFlags.HideInHierarchy;
+			
+			var shadowJoints = shadowRoot.GetComponentsInChildren<Joint>();
+			foreach (Joint j in shadowJoints)
+				j.connectedAnchor *= scale;
+
+			// Build list of bone pairs (matches shadow transforms with bone transforms)
+			var bones = GetComponentsInChildren<SkeletonUtilityBone>();
+			var shadowBones = shadowRoot.GetComponentsInChildren<SkeletonUtilityBone>();
+			foreach (var b in bones) {
+				if (b.gameObject == this.gameObject)
+					continue;
+
+				System.Type checkType = (physicsSystem == PhysicsSystem.Physics2D) ? typeof(Rigidbody2D) : typeof(Rigidbody);
+				foreach (var sb in shadowBones) {
+					if (sb.GetComponent(checkType) != null && sb.boneName == b.boneName) {
+						shadowTable.Add(new TransformPair {
+							dest = b.transform,
+							src = sb.transform
+						});
+						break;
+					}
+				}
+
+			}
+
+			// Destroy conflicting and unneeded components
+			DestroyComponents(shadowBones);
+
+			DestroyComponents(GetComponentsInChildren<Joint>());
+			DestroyComponents(GetComponentsInChildren<Rigidbody>());
+			DestroyComponents(GetComponentsInChildren<Collider>());
+		}
+
+		static void DestroyComponents (Component[] components) {
+			for (int i = 0, n = components.Length; i < n; i++)
+				Destroy(components[i]);
+		}
+
+		void FixedUpdate () {
+			if (physicsSystem == PhysicsSystem.Physics2D) {
+				var shadowRootRigidbody = shadowRoot.GetComponent<Rigidbody2D>();
+				shadowRootRigidbody.MovePosition(transform.position);
+				shadowRootRigidbody.MoveRotation(transform.rotation.eulerAngles.z);
+			} else {
+				var shadowRootRigidbody = shadowRoot.GetComponent<Rigidbody>();
+				shadowRootRigidbody.MovePosition(transform.position);
+				shadowRootRigidbody.MoveRotation(transform.rotation);
+			}
+
+			for (int i = 0, n = shadowTable.Count; i < n; i++) {
+				var pair = shadowTable[i];
+				pair.dest.localPosition = pair.src.localPosition;
+				pair.dest.localRotation = pair.src.localRotation;
+			}
+		}
+	}
+}