RayHitTestParameters.cs source code in C# .NET

                        Code:
                         / 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / wpf / src / Core / CSharp / System / Windows / Media3D / RayHitTestParameters.cs / 1305600 / RayHitTestParameters.cs
                        
                        
                            //---------------------------------------------------------------------------- 
//
// 
//    Copyright (C) Microsoft Corporation.  All rights reserved.
//  
//
// History: 
//  03/16/2004 : [....] - Created 
//
//--------------------------------------------------------------------------- 

using System;
using System.IO;
using System.Diagnostics; 
using System.Collections.Generic;
using MS.Internal.Media3D; 
using CultureInfo = System.Globalization.CultureInfo; 

namespace System.Windows.Media.Media3D 
{
    /// 
    ///     Encapsulates a set parameters for performing a 3D hit test agaist
    ///     a ray. 
    /// 
    public sealed class RayHitTestParameters : HitTestParameters3D 
    { 
        //-----------------------------------------------------
        // 
        //  Constructors
        //
        //-----------------------------------------------------
 
        #region Constructors
 
        ///  
        ///     Creates a RayHitTestParameters where the ray is described
        ///     by an origin and a direction. 
        /// 
        public RayHitTestParameters(Point3D origin, Vector3D direction)
        {
            _origin = origin; 
            _direction = direction;
            _isRay = true; 
        } 

        #endregion Constructors 

        //------------------------------------------------------
        //
        //  Public Methods 
        //
        //----------------------------------------------------- 
 
        //------------------------------------------------------
        // 
        //  Public Properties
        //
        //------------------------------------------------------
 
        #region Public Properties
 
        ///  
        ///     The origin of the ray to be used for hit testing.
        ///  
        public Point3D Origin
        {
            get { return _origin; }
        } 

        ///  
        ///     The direction of the ray to be used for hit testing. 
        /// 
        public Vector3D Direction 
        {
            get { return _direction; }
        }
 
        #endregion Public Properties
 
        //----------------------------------------------------- 
        //
        //  Public Events 
        //
        //------------------------------------------------------

        //----------------------------------------------------- 
        //
        //  Internal Methods 
        // 
        //-----------------------------------------------------
 
        #region Internal Methods

        internal void ReportResult(
            MeshGeometry3D meshHit, 
            Point3D pointHit,
            double distanceToRayOrigin, 
            int vertexIndex1, 
            int vertexIndex2,
            int vertexIndex3, 
            Point barycentric)
        {
            results.Add(new RayMeshGeometry3DHitTestResult(
                CurrentVisual, 
                CurrentModel,
                meshHit, 
                pointHit, 
                distanceToRayOrigin,
                vertexIndex1, 
                vertexIndex2,
                vertexIndex3,
                barycentric));
        } 

        internal HitTestResultBehavior RaiseCallback(HitTestResultCallback resultCallback, 
                                                     HitTestFilterCallback filterCallback, 
                                                     HitTestResultBehavior lastResult)
        { 
            return RaiseCallback(resultCallback, filterCallback, lastResult, 0.0 /* distance adjustment */);
        }

        internal HitTestResultBehavior RaiseCallback(HitTestResultCallback resultCallback, 
                                                     HitTestFilterCallback filterCallback,
                                                     HitTestResultBehavior lastResult, 
                                                     double distanceAdjustment) 
        {
            results.Sort(RayHitTestResult.CompareByDistanceToRayOrigin); 

            for(int i = 0, count = results.Count; i < count; i++)
            {
                RayHitTestResult result = results[i]; 

                result.SetDistanceToRayOrigin(result.DistanceToRayOrigin + distanceAdjustment); 
 
                Viewport2DVisual3D viewport2DVisual3D = result.VisualHit as Viewport2DVisual3D;
                if (viewport2DVisual3D != null) 
                {
                    Point intersectionPoint;
                    Visual viewport2DVisual3DChild = viewport2DVisual3D.Visual;
 
                    if (viewport2DVisual3DChild != null)
                    { 
                        if (Viewport2DVisual3D.GetIntersectionInfo(result, out intersectionPoint)) 
                        {
                            // convert the resulting point to visual coordinates 
                            Point visualPoint = Viewport2DVisual3D.TextureCoordsToVisualCoords(intersectionPoint, viewport2DVisual3DChild);
                            GeneralTransform gt = viewport2DVisual3DChild.TransformToOuterSpace().Inverse;

                            Point pointOnChild; 
                            if (gt != null && gt.TryTransform(visualPoint, out pointOnChild))
                            { 
 
                                HitTestResultBehavior behavior2D = viewport2DVisual3DChild.HitTestPoint(filterCallback,
                                                                                                        resultCallback, 
                                                                                                        new PointHitTestParameters(pointOnChild));

                                if (behavior2D == HitTestResultBehavior.Stop)
                                { 
                                    return HitTestResultBehavior.Stop;
                                } 
                            } 
                        }
                    } 
                }

                HitTestResultBehavior behavior = resultCallback(results[i]);
 
                if (behavior == HitTestResultBehavior.Stop)
                { 
                    return HitTestResultBehavior.Stop; 
                }
            } 

            return lastResult;
        }
 
        // Gets the hit testing line/ray specified as an origin and direction in
        // the current local space. 
        internal void GetLocalLine(out Point3D origin, out Vector3D direction) 
        {
            origin = _origin; 
            direction = _direction;

            bool isRay = true;
 
            if (HasWorldTransformMatrix)
            { 
                LineUtil.Transform(WorldTransformMatrix, ref origin, ref direction, out isRay); 
            }
 
            // At any point along the tree walk we may encounter a transform that turns the ray into
            // a line and if so we must stay a line
            _isRay &= isRay;
        } 

        internal void ClearResults() 
        { 
            if (results != null)
            { 
                results.Clear();
            }
        }
 
        #endregion Internal Methods
 
        internal bool IsRay 
        {
            get 
            {
                return _isRay;
            }
        } 

        //----------------------------------------------------- 
        // 
        //  Private Fields
        // 
        //------------------------------------------------------

        #region Private Fields
 
        private readonly Point3D _origin;
        private readonly Vector3D _direction; 
        private readonly List results = new List(); 
        // 'true' if this is a ray hit test, 'false' if the ray has become a line
        private bool _isRay; 

        #endregion Private Fields
    }
} 


// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
// Copyright (c) Microsoft Corporation. All rights reserved.
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RayHitTestParameters.cs source code in C# .NET

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