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到目前为止，使用触摸事件处理图片与使用鼠标功能并没有太大区别。下面我们将：

class PictureTracker  
 
{  
 
    private readonly ManipulationProcessor _processor =  
 
        new ManipulationProcessor(ProcessorManipulations.ALL);  
 
    public PictureTracker()  
 
    {  
 
        _processor.ManipulationStarted += (s, e) =>  
 
        {  
 
            System.Diagnostics.Trace.WriteLine("Manipulation has started: " + Picture.ImagePath);  
 
        };  
 
        _processor.ManipulationCompleted += (s, e) =>   
 
        {  
 
            System.Diagnostics.Trace.WriteLine("Manipulation has completed: " + Picture.ImagePath);  
 
        };  
 
        _processor.ManipulationDelta += ProcessManipulationDelta;  
 
    }  
 
    public Picture Picture { get; set; }  
 
    public void ProcessDown(int id, Point location)  
 
    {  
 
        _processor.ProcessDown((uint)id, location.ToDrawingPointF());  
 
    }  
 
    public void ProcessMove(int id, Point location)  
 
    {  
 
        _processor.ProcessMove((uint)id, location.ToDrawingPointF());  
 
    }  
 
    public void ProcessUp(int id, Point location)  
 
    {  
 
        _processor.ProcessUp((uint)id, location.ToDrawingPointF());  
 
    }  
 
    //Update picture state  
 
    private void ProcessManipulationDelta(object sender, ManipulationDeltaEventArgs e)  
 
    {  
 
        if (Picture == null)  
 
            return;  
 
        Picture.X += e.TranslationDelta.Width;  
 
        Picture.Y += e.TranslationDelta.Height;  
 
        Picture.Angle += e.RotationDelta * 180 / Math.PI;  
 
        Picture.ScaleX *= e.ScaleDelta;  
 
        Picture.ScaleY *= e.ScaleDelta;  
 
    }  
 
} 
 

using Windows7.Multitouch.Manipulation;  
 
using Windows7.Multitouch.WPF;  
 
Visual Basic  
 
Imports Windows7.Multitouch.Manipulation  
 
Imports Windows7.Multitouch.WPF 
 

public void ProcessDown(object sender, StylusEventArgs args)  
 
{  
 
    Point location = args.GetPosition(_canvas);  
 
    PictureTracker pictureTracker = GetPictureTracker(args.StylusDevice.Id, location);  
 
    if (pictureTracker == null)  
 
        return;  
 
    pictureTracker.ProcessDown(args.StylusDevice.Id, location);  
 
}  
 
public void ProcessUp(object sender, StylusEventArgs args)  
 
{  
 
    Point location = args.GetPosition(_canvas);  
 
    PictureTracker pictureTracker = GetPictureTracker(args.StylusDevice.Id);  
 
    if (pictureTracker == null)  
 
        return;  
 
    pictureTracker.ProcessUp(args.StylusDevice.Id, location);  
 
    _pictureTrackerMap.Remove(args.StylusDevice.Id);  
 
}  
 
public void ProcessMove(object sender, StylusEventArgs args)  
 
{  
 
    PictureTracker pictureTracker = GetPictureTracker(args.StylusDevice.Id);  
 
    if (pictureTracker == null)  
 
         return;  
 
     Point location = args.GetPosition(_canvas);  
 
     pictureTracker.ProcessMove(args.StylusDevice.Id, location);  
 
} 

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