Rotate PDF Page Content

GemBox.Pdf
1

Hello,

I have a PDF where the page has rotated by 270 degrees for printing (so PDFPage.Rotate = 270). I would like to reset that back to 0 but then rotate all the content 270 degrees so that it displays the same without having to deal with non 0-degree based orientations for the annotations on the page.

Thank you for any help you can provide

2

Hi Dawson,

I’m not exactly sure what you would like to achieve, nevertheless, can you try the following:

using (var document = PdfDocument.Load("input.pdf"))
{
    foreach (var page in document.Pages)
    {
        page.Rotate = 0;

        var elements = page.Content.Elements;
        var contentGroup = elements.Group(elements.First, elements.Last);

        var pageSize = page.Size;
        double scale = pageSize.Width / pageSize.Height;

        var transform = new PdfMatrix(scale, 0, 0, scale, pageSize.Width, 0);
        transform.Rotate(90);

        //var transform = new PdfMatrix(scale, 0, 0, scale, 0, pageSize.Width);
        //transform.Rotate(270);

        contentGroup.Transform = transform;
    }

    document.Save("output.pdf");
}

Here is the screenshot of the “input.pdf” (on the left) and the resulting “output.pdf” (on the right):

image
image1916×1038 148 KB

I hope this helps.

Regards,
Mario