iTextSharp centering text on page - itext

Question

I cannot get the text to be centered on the page. What am I doing wrong? I have tried several ways to get the page with, but none seem to make the text centered on the page.....
BaseFont bf = BaseFont.CreateFont("c:\\windows\\fonts\\calibri.ttf", BaseFont.CP1252, BaseFont.NOT_EMBEDDED);
PdfReader reader = new PdfReader("C:\\temp\\Certificate12.pdf");
var pageSize = reader.GetPageSize(1);
iTextSharp.text.Rectangle rec2 = new iTextSharp.text.Rectangle(PageSize.LETTER);
PdfStamper stamper = new PdfStamper(reader, stream1);
PdfContentByte canvas = stamper.GetUnderContent(1);
canvas.BeginText();
canvas.SetFontAndSize(bf, 24);
string nameText = "First Name Last Name";
int textWidth = (int)nameText.Length;
int canvasWidth = (int)canvas.PdfDocument.PageSize.Width;
float xStart = (canvasWidth / 2) - (textWidth / 2);
canvas.ShowTextAligned(PdfContentByte.ALIGN_CENTER, nameText, xStart, pageSize.GetTop(Utilities.MillimetersToPoints(145)), 0);

Answer 1

First of all, if you use ShowTextAligned with ALIGN_CENTER, iTextSharp will center the text for you, so you do not have to deal with the text width at all. You merely need to tell it to center the text on which center point.
Thus, you can center your text on the page like this:
BaseFont bf = BaseFont.CreateFont("c:\\windows\\fonts\\calibri.ttf", BaseFont.CP1252, BaseFont.NOT_EMBEDDED);
using (PdfReader reader = new PdfReader(source))
using (PdfStamper stamper = new PdfStamper(reader, new FileStream(dest, FileMode.Create, FileAccess.Write)))
{
Rectangle pageSize = reader.GetPageSize(1);
PdfContentByte canvas = stamper.GetUnderContent(1);
string nameText = "First Name Last Name";
canvas.BeginText();
canvas.SetFontAndSize(bf, 24);
canvas.ShowTextAligned(PdfContentByte.ALIGN_CENTER, nameText, (pageSize.Left + pageSize.Right) / 2, pageSize.GetTop(Utilities.MillimetersToPoints(145)), 0);
canvas.EndText();
}