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Assets/Spine/Runtime/spine-unity/Modules/SkeletonUtility Modules/SkeletonUtilityEyeConstraint.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;
+
+namespace Spine.Unity.Modules {
+	public class SkeletonUtilityEyeConstraint : SkeletonUtilityConstraint {
+		public Transform[] eyes;
+		public float radius = 0.5f;
+		public Transform target;
+		public Vector3 targetPosition;
+		public float speed = 10;
+		Vector3[] origins;
+		Vector3 centerPoint;
+
+		protected override void OnEnable () {
+			if (!Application.isPlaying) return;
+			base.OnEnable();
+
+			Bounds centerBounds = new Bounds(eyes[0].localPosition, Vector3.zero);
+			origins = new Vector3[eyes.Length];
+			for (int i = 0; i < eyes.Length; i++) {
+				origins[i] = eyes[i].localPosition;
+				centerBounds.Encapsulate(origins[i]);
+			}
+
+			centerPoint = centerBounds.center;
+		}
+
+		protected override void OnDisable () {
+			if (!Application.isPlaying) return;
+			base.OnDisable();
+		}
+
+		public override void DoUpdate () {
+			if (target != null) targetPosition = target.position;
+
+			Vector3 goal = targetPosition;
+			Vector3 center = transform.TransformPoint(centerPoint);
+			Vector3 dir = goal - center;
+
+			if (dir.magnitude > 1)
+				dir.Normalize();
+
+			for (int i = 0; i < eyes.Length; i++) {
+				center = transform.TransformPoint(origins[i]);
+				eyes[i].position = Vector3.MoveTowards(eyes[i].position, center + (dir * radius), speed * Time.deltaTime);
+			}
+
+		}
+	}
+}