Rotate Image in Win2D

Question

I'm trying to rotate image but couldn't get expected result. I've tried with WIn2D but couldn't make image as expected.

public async void Rotate(string originalImagepath, Rect originalImageRect, float degrees)
    {
        int height = (int)Math.Sqrt(originalImageRect.Width * originalImageRect.Width + originalImageRect.Height * originalImageRect.Height);

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

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

                using (FileStream imageStream = new FileStream(originalImagepath, 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(originalImageRect.X, originalImageRect.Y, originalImageRect.Width, originalImageRect.Height), sourceRect, 1, CanvasImageInterpolation.HighQualityCubic);

            }
        }
        catch (Exception ex)
        {

        }
        //Save Image Code here
    }

I want rotate image as 30 degree. After executing my code i got unexpected result.

Answer 1

I believe your code is correct. However, you need to convert your degrees to radian degrees:

private static double radian(double degrees) {
    return degrees * Math.PI / 180d;
}

This should fix it.