How to save a full-screen ink file in uwp?

I have a question about saving ink file (including ink's meta data file .gif) in uwp.

(ink means that something user drawn)

Currently, I can only save the range of ink that it's part of the inkcanvas, not full - screen inkcanvas

inkcanvas.InkPresenter.StrokeContainer.SaveAsync(outputStream);

This way only saves the ink, not inkcanvas's full-screen.

I want to show the ink and full-screen to user, so I need a ink and full-screen

Is this way possible?

Please any help! Thanks

Solution

A workaround for this is drawing 2 invisible dots to the canvas, one at the upper-left corner, one at the bottom-right corner.

Add them before the call to StrokeContainer.SaveAsync.

private void AddInvisibleDotsAtCorners()
{
    var inkStrokeBuilder = new InkStrokeBuilder();
    var stroke1 = inkStrokeBuilder.CreateStrokeFromInkPoints(
        new InkPoint[] 
        {
            new InkPoint(new Point(0, 0), 0.0f)
        }, System.Numerics.Matrix3x2.Identity);

    var stroke2 = inkStrokeBuilder.CreateStrokeFromInkPoints(
        new InkPoint[]
        {
            new InkPoint(new Point(inkCanvas.ActualWidth, inkCanvas.ActualHeight), 0.0f)
        }, System.Numerics.Matrix3x2.Identity);
    inkCanvas.InkPresenter.StrokeContainer.AddStroke(stroke1);
    inkCanvas.InkPresenter.StrokeContainer.AddStroke(stroke2);
}

then remove them after the call StrokeContainer.SaveAsync is completed.