How to get scaled UWP inkstroke points?

Question

I have an inkStroke in the inkcanvas, and I use method GetInkPoints to get the points collection of the inkstroke, if the inkcanvas size is 100 * 100 and I want to map the inkstroke to a page to 200*200, then I need to scale the inkstroke, the scale factor is 2, if I directly use point x and y to multiply scale factor, the shape of inkstroke will distort sometimes(for example when the inkstrole is a circle), so does anyone know how to make transform to a inkstroke and get its points then?

New added: I find that the inkstroke is consists of several Bézier curves, so does anyone know how to scale Bézier curve? Maybe I can scale each Bézier curve in a stroke and generate a new inkstroke and get its points.

Answer 1

If you want to scaled the InkStroke, we do not need to get the points in the InkCanvas. We can use InkCanvas.InkPresenter.StrokeContainer.GetStrokes to get all ink strokes in the collection.

We can use InkStroke.PointTransform property to set an affine transformation matrix to apply to the each InkStroke. The Matrix3x2 provide CreateScale to create a scale matrix from the given X and Y components.

For example:

var MyStrokes=  MyInkCanvas.InkPresenter.StrokeContainer.GetStrokes();
foreach (var stroke in MyStrokes)
{
    stroke.PointTransform = Matrix3x2.CreateScale(2, 2);
}