Problem with PDFont.getStringWidth()

[Gerrit Lober]

Dear all,

I've the following problem with PDFbox. I try to paint a rectangle with 
PDPageContentStream and then put a figure in the center of this rectangle.

Therefore I try to calculate the width of the text. The Method getStringWidth 
returns everytime the same width for all figures. That means that I get the 
same result for "12" and "32". Because the "1" is smaller than the "3" 
something is not correct and my "12" is a bit to right.

What is the reason for this?

I get the Font with the following code:
private PDFont getFont() throws IOException {
  return PDType1Font.HELVETICA;
}

Thanks!