Windows phone 8 如何在windows phone 8应用程序中以编程方式将guesture从一个画布设置到另一个画布上

我正在创建一个简单的canvas应用程序，它将从名为“ContentPanelCanvas”的canvas获取签名，该签名来自名为“弹出”的网格，并将该签名从“弹出”设置为“主画布”。 如果您知道，请帮助我解决这个问题，如何获取画布上下文并将其设置为空白画布

在Xaml中：

<Grid x:Name="ContentPanel">
    <Grid.RowDefinitions>
           <RowDefinition Height="*"></RowDefinition>
           <RowDefinition Height="Auto"></RowDefinition>
    </Grid.RowDefinitions>
     <Grid.ColumnDefinitions>
                    <ColumnDefinition Width="*"></ColumnDefinition>
     </Grid.ColumnDefinitions>
     <Grid Grid.Column="0">
            <Canvas Name="maincanvas">

            </Canvas>
        </Grid>

    <Grid  Name="Popup" Visibility="Collapsed" Grid.Row="0" Width="480" Height="300" Background="Black">
            <Grid.RowDefinitions>
                <RowDefinition Height="*"></RowDefinition>
                <RowDefinition Height="Auto"></RowDefinition>
            </Grid.RowDefinitions>
            <Grid Grid.Row="0">
            <Canvas Name="ContentPanelCanvas"  Background="Beige">

            </Canvas>
            </Grid>
            <Grid Grid.Row="1" HorizontalAlignment="Center">
                <Grid.ColumnDefinitions>
                    <ColumnDefinition Width="*"></ColumnDefinition>
                    <ColumnDefinition Width="*"></ColumnDefinition>
                </Grid.ColumnDefinitions>
                <Button Grid.Column="0" x:Name="btnOK" Content="OK" Tap="btnOK_Tap"/>
                <Button Grid.Column="1" x:Name="btnCancel" Content="Clear" Tap="btnCancel_Tap"/>
            </Grid>
        </Grid>
</Grid>

private void btnOK_点击（对象发送方，System.Windows.Input.GestureEventArgs e）
{
Popup.Visibility=Visibility.Collapsed；
int k=ContentPanelCanvas.Children.Count；
for（int i=0；i

仅出现一个点实际上我认为完整签名是画布中的单个元素，但它是一组子元素，并更新了代码。现在可以正常工作了

    private Point currentPoint;
    private Point oldPoint;
    Line line;

    public SingleImage()
    {
        InitializeComponent();
        this.ContentPanelCanvas.MouseMove += new MouseEventHandler(ContentPanelCanvas_MouseMove);
        this.ContentPanelCanvas.MouseLeftButtonDown += new MouseButtonEventHandler(ContentPanelCanvas_MouseLeftButtonDown);

    }

    void ContentPanelCanvas_MouseLeftButtonDown(object sender, MouseButtonEventArgs e)
    {
        currentPoint = e.GetPosition(ContentPanelCanvas);
        oldPoint = currentPoint;
    }

    void ContentPanelCanvas_MouseMove(object sender, MouseEventArgs e)
    {

        currentPoint = e.GetPosition(this.ContentPanelCanvas);

        line = new Line() { X1 = currentPoint.X, Y1 = currentPoint.Y, X2 = oldPoint.X, Y2 = oldPoint.Y };

        line.Stroke = new SolidColorBrush(Colors.Purple);
        line.StrokeThickness = 3;

        this.ContentPanelCanvas.Children.Add(line);
        oldPoint = currentPoint;
    }

    private void Button_Tap(object sender, System.Windows.Input.GestureEventArgs e)
    {
        Popup.Visibility = Visibility.Visible;
        ContentPanelCanvas.Children.Clear();
    }

    private void btnOK_Tap(object sender, System.Windows.Input.GestureEventArgs e)
    {
        Popup.Visibility = Visibility.Collapsed;          
       // Here i want to set signature to main canvas how to pass signature
          from one canvas to another?//    
    }

    private void btnCancel_Tap(object sender, System.Windows.Input.GestureEventArgs e)
    {
        ContentPanelCanvas.Children.Clear();
    }

private void btnOK_Tap(object sender, System.Windows.Input.GestureEventArgs e)
    {
        Popup.Visibility = Visibility.Collapsed;          
         int k = ContentPanelCanvas.Children.Count;
          for (int i = 0; i < k; i++)
          {
              line =(System.Windows.Shapes.Line)    ContentPanelCanvas.Children[0];
              line.StrokeThickness = 3;
              ContentPanelCanvas.Children.RemoveAt(0);
              maincanvas.Children.Add(line);
           }

    }