3DTools/Trackball.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.Diagnostics;
using System.Windows;
using System.Windows.Input;
using System.Windows.Media.Media3D;
using System.Windows.Markup;

namespace _3DTools
{
    /// <summary>
    ///     Trackball is a utility class which observes the mouse events
    ///     on a specified FrameworkElement and produces a Transform3D
    ///     with the resultant rotation and scale.
    /// 
    ///     Example Usage:
    /// 
    ///         Trackball trackball = new Trackball();
    ///         trackball.EventSource = myElement;
    ///         myViewport3D.Camera.Transform = trackball.Transform;
    /// 
    ///     Because Viewport3Ds only raise events when the mouse is over the
    ///     rendered 3D geometry (as opposed to not when the mouse is within
    ///     the layout bounds) you usually want to use another element as 
    ///     your EventSource.  For example, a transparent border placed on
    ///     top of your Viewport3D works well:
    ///     
    ///         <Grid>
    ///           <ColumnDefinition />
    ///           <RowDefinition />
    ///           <Viewport3D Name="myViewport" ClipToBounds="True" Grid.Row="0" Grid.Column="0" />
    ///           <Border Name="myElement" Background="Transparent" Grid.Row="0" Grid.Column="0" />
    ///         </Grid>
    ///     
    ///     NOTE: The Transform property may be shared by multiple Cameras
    ///           if you want to have auxilary views following the trackball.
    /// 
    ///           It can also be useful to share the Transform property with
    ///           models in the scene that you want to move with the camera.
    ///           (For example, the Trackport3D's headlight is implemented
    ///           this way.)