问UWP(通用Windows平台)中图像的橡皮擦功能

EN

<Grid x:Name="RootGrid">
    <Image x:Name="ImageRender" Source="Assets/Butterfly.png" />
    <InkCanvas x:Name="inkCanvas" Loaded="inkCanvas_Loaded" />
</Grid>

public sealed partial class MainPage : Page
{
    public MainPage()
    {
        this.InitializeComponent();
        inkCanvas.InkPresenter.InputDeviceTypes =
        Windows.UI.Core.CoreInputDeviceTypes.Mouse |
        Windows.UI.Core.CoreInputDeviceTypes.Pen;
    }

    private void inkCanvas_Loaded(object sender, RoutedEventArgs e)
    {
        InkDrawingAttributes attributes = new InkDrawingAttributes();
        attributes.PenTip = PenTipShape.Rectangle;
        attributes.Size = new Size(10, 10);
        attributes.Color = Colors.White;
        inkCanvas.InkPresenter.UpdateDefaultDrawingAttributes(attributes);         
    }
}