How to change the coordinates of a text in a pdf page from lower left to upper left

Question

I am using PDFBOX and itextsharp dll and processing a pdf. so that I get the text coordinates of the text within a rectangle. the rectangle coordinates are extracted using the i

Answer 1

          if ((mediabox.Top - mediabox.Height) != 0)
            {
                topY = mediabox.Top;
                heightY = mediabox.Height;
                diffY = topY - heightY;
                lly_adjust = (topY - ury) + diffY;
                ury_adjust = (topY - lly) + diffY;
            }
            else if ((cropbox.Top - cropbox.Height) != 0)
            {
                topY = mediabox.Top;
                heightY = cropbox.Top;
                diffY = topY - heightY;
                lly_adjust = (topY - ury) - diffY;
                ury_adjust = (topY - lly) - diffY;

            }
            else
            {

                lly_adjust = mediabox.Top - ury;
                ury_adjust = mediabox.Top - lly;

            }

These are final adjustment done