yzyCli/u3d/Assets/LuaFramework/Tools/Spine/spine-csharp/Attachments/PointAttachment.cs

/******************************************************************************
 * Spine Runtimes Software License v2.5
 *
 * Copyright (c) 2013-2016, Esoteric Software
 * All rights reserved.
 *
 * You are granted a perpetual, non-exclusive, non-sublicensable, and
 * non-transferable license to use, install, execute, and perform the Spine
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 * the Spine Software License Agreement), you may not (a) modify, translate,
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 * or other intellectual property or proprietary rights notices on or in the
 * Software, including any copy thereof. Redistributions in binary or source
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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;
		}
	}
}