feilong-client/Assets/Scripts/Spine/Runtime/spine-csharp/Attachments/PointAttachment.cs

/******************************************************************************
 * Spine Runtimes License Agreement
 * Last updated January 1, 2020. Replaces all prior versions.
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 * Copyright (c) 2013-2020, Esoteric Software LLC
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namespace Spine {
	/// <summary>
	/// An attachment which is a single point and a rotation. This can be used to spawn projectiles, particles, etc. A bone can be
	/// used in similar ways, but a PointAttachment is slightly less expensive to compute and can be hidden, shown, and placed in a
	/// skin.
	/// <p>
	/// See <a href="http://esotericsoftware.com/spine-point-attachments">Point Attachments</a> in the Spine User Guide.
	/// </summary>
	public class PointAttachment : Attachment {
		internal float x, y, rotation;
		public float X { get { return x; } set { x = value; } }
		public float Y { get { return y; } set { y = value; } }
		public float Rotation { get { return rotation; } set { rotation = value; } }

		public PointAttachment (string name)
			: base(name) {
		}

		public void ComputeWorldPosition (Bone bone, out float ox, out float oy) {
			bone.LocalToWorld(this.x, this.y, out ox, out oy);
		}

		public float ComputeWorldRotation (Bone bone) {
			float cos = MathUtils.CosDeg(rotation), sin = MathUtils.SinDeg(rotation);
			float ix = cos * bone.a + sin * bone.b;
			float iy = cos * bone.c + sin * bone.d;
			return MathUtils.Atan2(iy, ix) * MathUtils.RadDeg;
		}

		public override Attachment Copy () {
			PointAttachment copy = new PointAttachment(this.Name);
			copy.x = x;
			copy.y = y;
			copy.rotation = rotation;
			return copy;
		}
	}
}