如何在win2d (CanvasVirtualControl)中使用c#加载svg映像？

Question

我正在使用Win2D开发一个UWP应用程序，我想知道如何在Win2D中加载一个.svg文件(在我的应用程序中)。我不知道如何读取svg文件并将其转换为RandomAccessStream。

Answer 1

如何在win2d (CanvasVirtualControl)中使用c#加载svg映像？

Win2D包含用于从流加载svg的CanvasSvgDocument类。您可以使用StorageFile OpenReadAsync方法作为流打开svg文件，然后调用CanvasSvgDocument.LoadAsync方法获取svgDocument。欲了解更多信息，请参考以下内容。

CanvasVirtualControl canvasVirtualControl;
private void Page_Loaded(object sender, RoutedEventArgs e)
{
    canvasVirtualControl = new CanvasVirtualControl();
    canvasVirtualControl.Width = 1486;
    canvasVirtualControl.Height = 610;
    MyCanvas.Children.Add(canvasVirtualControl);
    Canvas.SetLeft(canvasVirtualControl, 0);
    Canvas.SetTop(canvasVirtualControl, 100);
    canvasVirtualControl.RegionsInvalidated += CanvasVirtualControl_RegionsInvalidated;
}

private async void CanvasVirtualControl_RegionsInvalidated(CanvasVirtualControl sender, CanvasRegionsInvalidatedEventArgs args)
{
    CanvasDrawingSession drawingSession;
    Rect rect = new Rect(args.InvalidatedRegions[0].Left, args.InvalidatedRegions[0].Top, args.InvalidatedRegions[0].Width, args.InvalidatedRegions[0].Height);
    using (drawingSession = sender.CreateDrawingSession(rect))
    {
        var file = await StorageFile.GetFileFromApplicationUriAsync(new Uri("ms-appx:///Assets/xxx.svg"));

        using (var stream = await file.OpenReadAsync())
        {
           var svgDocument = await CanvasSvgDocument.LoadAsync(sender, stream);

            drawingSession.DrawSvg(svgDocument, sender.Size);
        }
    }        
}