我正在尝试旋转图像，但无法得到预期的结果。 我想旋转图像为90度。 在执行我的代码后，我得到了意想不到的结果。 下面是我的代码:

public async Task Rotate(string path, Rect rect, float degrees)
    {
        int h = (int)Math.Sqrt(rect.Width * rect.Width + rect.Height * rect.Height);

        CanvasDevice device = CanvasDevice.GetSharedDevice();
        CanvasRenderTarget webCardImage = null;
        CanvasBitmap bitmap = null;
        var logicalDpi = DisplayInformation.GetForCurrentView().LogicalDpi;
        Vector2 endpoint = new Vector2((float)rect.Width / 2, (float)rect.Height / 2);

        try
        {
            webCardImage = new CanvasRenderTarget(device, h, h, logicalDpi);
            using (var ds = webCardImage.CreateDrawingSession())
            {
                ds.Clear(Colors.Transparent);

                using (FileStream imageStream = new FileStream(path, FileMode.Open))
                {
                    IRandomAccessStream fileStream = imageStream.AsRandomAccessStream();
                    bitmap = await CanvasBitmap.LoadAsync(device, fileStream);
                }

                ICanvasImage image = new Transform2DEffect
                {
                    Source = bitmap,
                    TransformMatrix = Matrix3x2.CreateRotation(degrees, endpoint),
                };
                var sourceRect = image.GetBounds(ds);
                ds.DrawImage(image, new Rect(rect.X, rect.Y, rect.Width, rect.Height), sourceRect, 1, CanvasImageInterpolation.HighQualityCubic);

            }
        }
        catch (Exception ex)
        {

        }

        //Convert to Image
    }

我得代码生成得图像: