Rotating PDF in C# using iTextSharp

Question

I am using the below function to split the pdf into two.

Though it is spliting the pdf, the content is appearing upside down. How do I rotate it by 180 degrees.

Answer 1

I have found the above answers do not rotate correctly for all 4 of the main rotations.

Below is my code to handle 0, 90, 180 and 270 correctly. This has been tested with a PDF rotated in each of these directions.

var pageRotation = reader.GetPageRotation(currentPageIndex);
var pageWidth = reader.GetPageSizeWithRotation(currentPageIndex).Width;
var pageHeight = reader.GetPageSizeWithRotation(currentPageIndex).Height;
switch (pageRotation)
{
    case 0:
        writer.DirectContent.AddTemplate(importedPage, 1f, 0, 0, 1f, 0, 0);
        break;

    case 90:
        writer.DirectContent.AddTemplate(importedPage, 0, -1f, 1f, 0, 0, pageHeight);
        break;

    case 180:
        writer.DirectContent.AddTemplate(importedPage, -1f, 0, 0, -1f, pageWidth, pageHeight);
        break;

    case 270:
        writer.DirectContent.AddTemplate(importedPage, 0, 1f, -1f, 0, pageWidth, 0);
        break;

    default:
        throw new InvalidOperationException(string.Format("Unexpected page rotation: [{0}].", pageRotation));
}