How can I extract subscript / superscript properly from a PDF using iTextSharp?

Question

iTextSharp works well extracting plain text from PDF documents, but I\'m having trouble with subscript/superscript text, common in technical documents.

TextChu

Answer 1

I just solved a similar problem, see my question. I detect subscripts as text that have a baseline between the Ascending and Descending lines of the preceding text. This snipped of code might be usefull:

        Vector thisFacade = this.ascentLine.GetStartPoint().Subtract(this.descentLine.GetStartPoint());
        Vector infoFacade = renderInfo.GetAscentLine().GetStartPoint().Subtract(renderInfo.GetDescentLine().GetStartPoint());
        if (baseVector.Cross(ascent2base).Dot(baseVector.Cross(descent2base)) < 0
            && infoFacade.LengthSquared < thisFacade.LengthSquared - sameHeightThreshols)

More details after Chistmass.