How to position text relative to page?

My code gives me inconsistent positions of text.

JAVA

int n = reader.getNumberOfPages();
PdfImportedPage page;
PdfCopy.PageStamp stamp;for(int j =0; j  n;){++j;
    page = writer.getImportedPage(reader, j);
    stamp = writer.createPageStamp(page);Rectangle crop = reader.getCropBox(1);// add overlay text
    Phrase phrase =new Phrase("Overlay Text");
    ColumnText.showTextAligned(stamp.getOverContent(), Element.ALIGN_CENTER,
        phrase, crop.getRight(72f), crop.getHeight()/2, 90);
    stamp.alterContents();
    writer.addPage(page);}

The code above gives me inconsistent positions of text. In some pages, only a portion of the "Overlay text" is visible.

Please help, I don't know how to properly use mediabox and cropbox and I'm new to iText.

Posted on StackOverflow on Jul 13, 2013 by euler

Regarding the inconsistent position: that should be fixed by adding the vertical offset:

JAVA

crop.getRight(72f), crop.getBottom() + crop.getHeight() / 2

Do you see? You took the right border with a margin of 1 inch as x coordinate, but you forgot to take into account the y coordinate of the bottom of the page (it's not always 0). Normally, this should fix the positioning problem.

Click How to position text relative to page? | iText 5 PDF Development Guide if you want to see how to answer this question in iText 5.