public void GetHypotenuse_Angle_Should_return_Valid_angle()
{
double adjacent = 8.5;
double opposite = 11;
double angle = FooTheoryMath.GetHypotenuseAngleInDegreesFrom(opposite, adjacent);
Assert.AreEqual(52.305759533310827, angle);
}
/// <summary>
/// Method that will utilize iTextSharp to write the <see cref="stringToWriteToPdf"/> to the
/// pdf on each page of the PDF.
/// </summary>
/// <param name="sourceFile">The PDf File</param>
/// <param name="stringToWriteToPdf">The text to write to the pdf</param>
/// <returns>The bytes of the newly updated PDF with <see cref="stringToWriteToPdf"/> in the pdf.</returns>
public static byte[] WriteToPdf(FileInfo sourceFile, string stringToWriteToPdf)
{
PdfReader reader = new PdfReader(sourceFile.FullName);
using (MemoryStream memoryStream = new MemoryStream())
{
//
// PDFStamper is the class we use from iTextSharp to alter an existing PDF.
//
PdfStamper pdfStamper = new PdfStamper(reader, memoryStream);
for (int i = 1; i <= reader.NumberOfPages; i++) // Must start at 1 because 0 is not an actual page.
{
//
// If you ask for the page size with the method getPageSize(), you always get a
// Rectangle object without rotation (rot. 0 degrees)—in other words, the paper size
// without orientation. That’s fine if that’s what you’re expecting; but if you reuse
// the page, you need to know its orientation. You can ask for it separately with
// getPageRotation(), or you can use getPageSizeWithRotation(). - (Manning Java iText Book)
//
//
Rectangle pageSize = reader.GetPageSizeWithRotation(i);
//
// Gets the content ABOVE the PDF, Another option is GetUnderContent(...)
// which will place the text below the PDF content.
//
PdfContentByte pdfPageContents = pdfStamper.GetOverContent(i);
pdfPageContents.BeginText(); // Start working with text.
//
// Create a font to work with
//
BaseFont baseFont = BaseFont.CreateFont(BaseFont.HELVETICA_BOLD, Encoding.ASCII.EncodingName, false);
pdfPageContents.SetFontAndSize(baseFont, 20); // 40 point font
pdfPageContents.SetRGBColorFill(170, 170, 170); // Sets the color of the font, RED in this instance
//
// Angle of the text. This will give us the angle so we can angle the text diagonally
// from the bottom left corner to the top right corner through the use of simple trigonometry.
//
float textAngle =
(float)FooTheoryMath.GetHypotenuseAngleInDegreesFrom(pageSize.Height, pageSize.Width);
//
// Note: The x,y of the Pdf Matrix is from bottom left corner.
// This command tells iTextSharp to write the text at a certain location with a certain angle.
// Again, this will angle the text from bottom left corner to top right corner and it will
// place the text in the middle of the page.
//
pdfPageContents.ShowTextAligned(PdfContentByte.ALIGN_CENTER, stringToWriteToPdf,
pageSize.Width / 2,
pageSize.Height / 2,
textAngle);
pdfPageContents.EndText(); // Done working with text
}
pdfStamper.FormFlattening = true; // enable this if you want the PDF flattened.
pdfStamper.Close(); // Always close the stamper or you'll have a 0 byte stream.
return(memoryStream.ToArray());
}
}