c# - 在 InkCanvas 上画线

Question

我希望能够在 InkCanvas 上绘制形状。到目前为止，我有以下 XAML:-

<Grid Background="{ThemeResource ApplicationPageBackgroundThemeBrush}">
    <Canvas x:Name="selectionCanvas" />
    <InkCanvas x:Name="inker" />
</Grid>

在页面构造函数中，我有以下内容:-

inker.InkPresenter.UnprocessedInput.PointerPressed += StartLine;
inker.InkPresenter.UnprocessedInput.PointerMoved += ContinueLine;
inker.InkPresenter.UnprocessedInput.PointerReleased += CompleteLine;
inker.InkPresenter.InputProcessingConfiguration.RightDragAction = InkInputRightDragAction.LeaveUnprocessed;

三个事件如下:-

private void StartLine(InkUnprocessedInput sender, PointerEventArgs args)
{
    line = new Line();
    line.X1 = args.CurrentPoint.RawPosition.X;
    line.Y1 = args.CurrentPoint.RawPosition.Y;
    line.X2 = args.CurrentPoint.RawPosition.X;
    line.Y2 = args.CurrentPoint.RawPosition.Y;

    line.Stroke = new SolidColorBrush(Colors.Purple);
    line.StrokeThickness = 4;
    selectionCanvas.Children.Add(line);
}

private void ContinueLine(InkUnprocessedInput sender, PointerEventArgs args)
{
    line.X2 = args.CurrentPoint.RawPosition.X;
    line.Y2 = args.CurrentPoint.RawPosition.Y;

}

private void CompleteLine(InkUnprocessedInput sender, PointerEventArgs args)
{

}

我是否可以将当前在 selectionCanvas 上绘制的线条绘制到我的 InkCanvas 上？

谢谢，

杰夫

Answer 1

谢谢杰登，

这为我指明了正确的方向。为了完整起见，这里是我的解决方案中的代码:-

private void CompleteLine(InkUnprocessedInput sender, PointerEventArgs args)
{
    List<InkPoint> points = new List<InkPoint>();
        InkStrokeBuilder builder = new InkStrokeBuilder();


        InkPoint pointOne = new InkPoint(new Point(line.X1, line.Y1), 0.5f);
        points.Add(pointOne);
        InkPoint pointTwo = new InkPoint(new Point(line.X2, line.Y2), 0.5f);
        points.Add(pointTwo);

        InkStroke stroke = builder.CreateStrokeFromInkPoints(points, System.Numerics.Matrix3x2.Identity);
        InkDrawingAttributes ida = inker.InkPresenter.CopyDefaultDrawingAttributes();
        stroke.DrawingAttributes = ida;
        inker.InkPresenter.StrokeContainer.AddStroke(stroke);
        selectionCanvas.Children.Remove(line);
}