3DTools/TrackballDecorator.cs

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//---------------------------------------------------------------------------
//
// (c) Copyright Microsoft Corporation.
// This source is subject to the Microsoft Limited Permissive License.
// See http://www.microsoft.com/resources/sharedsource/licensingbasics/limitedpermissivelicense.mspx
// All other rights reserved.
//
// This file is part of the 3D Tools for Windows Presentation Foundation
// project.  For more information, see:
// 
// http://CodePlex.com/Wiki/View.aspx?ProjectName=3DTools
//
// The following article discusses the mechanics behind this
// trackball implementation: http://viewport3d.com/trackball.htm
//
// Reading the article is not required to use this sample code,
// but skimming it might be useful.
//
//---------------------------------------------------------------------------

using System;
using System.Collections;
using System.Collections.Generic;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Data;
using System.Windows.Documents;
using System.Windows.Media;
using System.Windows.Media.Imaging;
using System.Windows.Media.Media3D;
using System.Windows.Shapes;
using System.Windows.Input;
using System.Windows.Markup; // IAddChild, ContentPropertyAttribute

namespace _3DTools
{
    public class TrackballDecorator : Viewport3DDecorator
    {
        public TrackballDecorator()
        {
            // the transform that will be applied to the viewport 3d's camera
            _transform = new Transform3DGroup();
            _transform.Children.Add(_scale);
            _transform.Children.Add(new RotateTransform3D(_rotation));

            // used so that we always get events while activity occurs within
            // the viewport3D
            _eventSource = new Border();
            _eventSource.Background = Brushes.Transparent;
            
            PreViewportChildren.Add(_eventSource);
        }

        /// <summary>
        ///     A transform to move the camera or scene to the trackball's
        ///     current orientation and scale.
        /// </summary>
        public Transform3D Transform
        {
            get { return _transform; }