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Assets/Spine/Runtime/spine-unity/Modules/SkeletonUtility Modules/SkeletonUtilityGroundConstraint.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.
+ *****************************************************************************/
+
+#if UNITY_2018_3 || UNITY_2019 || UNITY_2018_3_OR_NEWER
+#define NEW_PREFAB_SYSTEM
+#endif
+
+using UnityEngine;
+
+namespace Spine.Unity.Modules {
+
+	#if NEW_PREFAB_SYSTEM
+	[ExecuteAlways]
+	#else
+	[ExecuteInEditMode]
+	#endif
+	[RequireComponent(typeof(SkeletonUtilityBone))]
+	public class SkeletonUtilityGroundConstraint : SkeletonUtilityConstraint {
+
+		[Tooltip("LayerMask for what objects to raycast against")]
+		public LayerMask groundMask;
+		[Tooltip("Use 2D")]
+		public bool use2D = false;
+		[Tooltip("Uses SphereCast for 3D mode and CircleCast for 2D mode")]
+		public bool useRadius = false;
+		[Tooltip("The Radius")]
+		public float castRadius = 0.1f;
+		[Tooltip("How high above the target bone to begin casting from")]
+		public float castDistance = 5f;
+		[Tooltip("X-Axis adjustment")]
+		public float castOffset = 0;
+		[Tooltip("Y-Axis adjustment")]
+		public float groundOffset = 0;
+		[Tooltip("How fast the target IK position adjusts to the ground.  Use smaller values to prevent snapping")]
+		public float adjustSpeed = 5;
+
+		Vector3 rayOrigin;
+		Vector3 rayDir = new Vector3(0, -1, 0);
+		float hitY;
+		float lastHitY;
+
+		protected override void OnEnable () {
+			base.OnEnable();
+			lastHitY = transform.position.y;
+		}
+
+		public override void DoUpdate () {
+			rayOrigin = transform.position + new Vector3(castOffset, castDistance, 0);
+
+			hitY = float.MinValue;
+			if (use2D) {
+				RaycastHit2D hit;
+
+				if (useRadius)
+					hit = Physics2D.CircleCast(rayOrigin, castRadius, rayDir, castDistance + groundOffset, groundMask);
+				else
+					hit = Physics2D.Raycast(rayOrigin, rayDir, castDistance + groundOffset, groundMask);
+
+				if (hit.collider != null) {
+					hitY = hit.point.y + groundOffset;
+					if (Application.isPlaying)
+						hitY = Mathf.MoveTowards(lastHitY, hitY, adjustSpeed * Time.deltaTime);
+				} else {
+					if (Application.isPlaying)
+						hitY = Mathf.MoveTowards(lastHitY, transform.position.y, adjustSpeed * Time.deltaTime);
+				}
+			} else {
+				RaycastHit hit;
+				bool validHit = false;
+
+				if (useRadius)
+					validHit = Physics.SphereCast(rayOrigin, castRadius, rayDir, out hit, castDistance + groundOffset, groundMask);
+				else
+					validHit = Physics.Raycast(rayOrigin, rayDir, out hit, castDistance + groundOffset, groundMask);
+
+				if (validHit) {
+					hitY = hit.point.y + groundOffset;
+					if (Application.isPlaying)
+						hitY = Mathf.MoveTowards(lastHitY, hitY, adjustSpeed * Time.deltaTime);
+
+				} else {
+					if (Application.isPlaying)
+						hitY = Mathf.MoveTowards(lastHitY, transform.position.y, adjustSpeed * Time.deltaTime);
+				}
+			}
+
+			Vector3 v = transform.position;
+			v.y = Mathf.Clamp(v.y, Mathf.Min(lastHitY, hitY), float.MaxValue);
+			transform.position = v;
+
+			bone.bone.X = transform.localPosition.x;
+			bone.bone.Y = transform.localPosition.y;
+
+			lastHitY = hitY;
+		}
+
+		void OnDrawGizmos () {
+			Vector3 hitEnd = rayOrigin + (rayDir * Mathf.Min(castDistance, rayOrigin.y - hitY));
+			Vector3 clearEnd = rayOrigin + (rayDir * castDistance);
+			Gizmos.DrawLine(rayOrigin, hitEnd);
+
+			if (useRadius) {
+				Gizmos.DrawLine(new Vector3(hitEnd.x - castRadius, hitEnd.y - groundOffset, hitEnd.z), new Vector3(hitEnd.x + castRadius, hitEnd.y - groundOffset, hitEnd.z));
+				Gizmos.DrawLine(new Vector3(clearEnd.x - castRadius, clearEnd.y, clearEnd.z), new Vector3(clearEnd.x + castRadius, clearEnd.y, clearEnd.z));
+			}
+
+			Gizmos.color = Color.red;
+			Gizmos.DrawLine(hitEnd, clearEnd);
+		}
+	}
+
+}