ProjectionCamera.cs source code in C# .NET

Source code for the .NET framework in C#

                        
Code:

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

                        
                            //---------------------------------------------------------------------------- 
//
// 
//    Copyright (C) Microsoft Corporation.  All rights reserved.
//  
//
//--------------------------------------------------------------------------- 
 
using System;
 
namespace System.Windows.Media.Media3D
{
    /// 
    ///     The ProjectionCamera is an abstract base class from cameras 
    ///     constructed from well-understand parameers such as Position,
    ///     LookAtPoint, and Up. 
    ///  
    public abstract partial class ProjectionCamera : Camera
    { 
        //-----------------------------------------------------
        //
        //  Constructors
        // 
        //-----------------------------------------------------
 
        ///  
        /// Prevent 3rd parties from extending this abstract base class.
        ///  
        internal ProjectionCamera()
        {
        }
 
        //------------------------------------------------------
        // 
        //  Public Methods 
        //
        //----------------------------------------------------- 

        //------------------------------------------------------
        //
        //  Public Properties 
        //
        //------------------------------------------------------ 
 
        //-----------------------------------------------------
        // 
        //  Public Events
        //
        //------------------------------------------------------
 
        //-----------------------------------------------------
        // 
        //  Internal Methods 
        //
        //----------------------------------------------------- 

        #region Internal Methods

        internal override Matrix3D GetViewMatrix() 
        {
            Point3D position = Position; 
            Vector3D lookDirection = LookDirection; 
            Vector3D upDirection = UpDirection;
 
            return CreateViewMatrix(Transform, ref position, ref lookDirection, ref upDirection);
        }

        // Transfrom that moves the world to a camera coordinate system 
        // where the camera is at the origin looking down the negative z
        // axis and y is up. 
        // 
        // NOTE: We consider camera.Transform to be part of the view matrix.
        // 
        internal static Matrix3D CreateViewMatrix(Transform3D transform, ref Point3D position, ref Vector3D lookDirection, ref Vector3D upDirection)
        {
            Vector3D zaxis = -lookDirection;
            zaxis.Normalize(); 

            Vector3D xaxis = Vector3D.CrossProduct(upDirection, zaxis); 
            xaxis.Normalize(); 

            Vector3D yaxis = Vector3D.CrossProduct(zaxis, xaxis); 

            Vector3D positionVec = (Vector3D) position;
            double cx = -Vector3D.DotProduct(xaxis, positionVec);
            double cy = -Vector3D.DotProduct(yaxis, positionVec); 
            double cz = -Vector3D.DotProduct(zaxis, positionVec);
 
            Matrix3D viewMatrix = new Matrix3D( 
                xaxis.X, yaxis.X, zaxis.X, 0,
                xaxis.Y, yaxis.Y, zaxis.Y, 0, 
                xaxis.Z, yaxis.Z, zaxis.Z, 0,
                cx, cy, cz, 1);

            PrependInverseTransform(transform, ref viewMatrix); 

            return viewMatrix; 
        } 

        #endregion Internal Methods 

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


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

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