AxisAngleRotation3D.cs source code in C# .NET

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Code:

/ DotNET / DotNET / 8.0 / untmp / WIN_WINDOWS / lh_tools_devdiv_wpf / Windows / wcp / Core / System / Windows / Media3D / AxisAngleRotation3D.cs / 1 / AxisAngleRotation3D.cs

                            //---------------------------------------------------------------------------- 
//
// 
//    Copyright (C) Microsoft Corporation.  All rights reserved.
//  
//
//--------------------------------------------------------------------------- 
 
using System;
using MS.Internal; 

namespace System.Windows.Media.Media3D
{
    ///  
    /// A rotation in 3-space defined by an axis and an angle to rotate about that axis.
    ///  
    public partial class AxisAngleRotation3D 
    {
        //----------------------------------------------------- 
        //
        //  Constructors
        //
        //----------------------------------------------------- 

        #region Constructors 
 
        /// 
        /// Default constructor that creates a rotation with Axis (0,1,0) and Angle of 0. 
        /// 
        public AxisAngleRotation3D() {}

        ///  
        /// Constructor taking axis and angle.
        ///  
        public AxisAngleRotation3D(Vector3D axis, double angle) 
        {
            Axis = axis; 
            Angle = angle;
        }

        #endregion Constructors 

        //------------------------------------------------------ 
        // 
        //  Public Methods
        // 
        //-----------------------------------------------------

        //------------------------------------------------------
        // 
        //  Public Properties
        // 
        //------------------------------------------------------ 

        //----------------------------------------------------- 
        //
        //  Public Events
        //
        //------------------------------------------------------ 

        //----------------------------------------------------- 
        // 
        //  Internal Properties
        // 
        //-----------------------------------------------------

        #region Internal Properties
 
        // Used by animation to get a snapshot of the current rotational
        // configuration for interpolation in Rotation3DAnimations. 
        internal override Quaternion InternalQuaternion 
        {
            get 
            {
                if (_cachedQuaternionValue == c_dirtyQuaternion)
                {
                    Vector3D axis = Axis; 

                    // Quaternion's axis/angle ctor throws if the axis has zero length. 
                    // 
                    // This threshold needs to match the one we used in D3DXVec3Normalize (d3dxmath9.cpp)
                    // and in unmanaged code.  See also AxisAngleRotation3D.cpp. 
                    if (axis.LengthSquared > DoubleUtil.FLT_MIN)
                    {
                        _cachedQuaternionValue = new Quaternion(axis, Angle);
                    } 
                    else
                    { 
                        // If we have a zero-length axis we return identity (i.e., 
                        // we consider this to be no rotation.)
                        _cachedQuaternionValue = Quaternion.Identity; 
                    }
                }

                return _cachedQuaternionValue; 
            }
        } 
 
        #endregion Internal Properties
 
        internal void AxisPropertyChangedHook(DependencyPropertyChangedEventArgs e)
        {
            _cachedQuaternionValue = c_dirtyQuaternion;
        } 

        internal void AnglePropertyChangedHook(DependencyPropertyChangedEventArgs e) 
        { 
            _cachedQuaternionValue = c_dirtyQuaternion;
        } 

        //-----------------------------------------------------
        //
        //  Private Fields 
        //
        //------------------------------------------------------ 
 
        private Quaternion _cachedQuaternionValue = c_dirtyQuaternion;
 
        // Arbitrary quaternion that will signify that our cached quat is dirty
        // Reasonable quaternions are normalized so it's very unlikely that this
        // will ever occurr in a normal application.
        internal static readonly Quaternion c_dirtyQuaternion = new Quaternion( 
            Math.E, Math.PI, Math.E * Math.PI, 55.0
            ); 
    } 
}

// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
// Copyright (c) Microsoft Corporation. All rights reserved.
                        

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