Roman, The text monad is very low level and its functions are mapping directly to the PDF text environment commands. "text" function is generating two PDF commands : Td and Tj. In Adobe PDF spec : Td : Move to the start of the next line, offset from the start of the current line by (tx , ty ). tx and ty are numbers expressed in unscaled text space units. Tj : Show a text string. So, the behavior is correct and HPDF really needs a documentation :-) and some cleaning of the API. Thanks, Christophe.
Here is a program which illustrates an unexpected behaviour:
import Graphics.PDF
main = runPdf "bug.pdf" standardDocInfo (PDFRect 0 0 100 100) pdf where pdf = do p <- addPage Nothing drawWithPage p $ drawText $ sequence $ replicate 10 $ text (PDFFont Helvetica 10) 10 10 (toPDFString "ABC")
What I expect here is "ABC" printed 10 times on the same place (starting at (10,10)). What I see (in Okular) is ABC printed each time in the new place like this:
ABC ABC ABC ABC
What's happening here? I'm using HPDF-1.4.1 from Hackage.
-- Roman I. Cheplyaka :: http://ro-che.info/ "Don't let school get in the way of your education." - Mark Twain