Graphics output

I would like to write line graphics into a file (e.g. contour lines calculated by a Haskell function) and access the data from standard programs. For the output I need a Library. Since I do not to write the output I would like to know if there is a library writing graphics in a standard format like dxf or PostScript. I have not found anything on the Web so this is my last chance. Thanks in advance! Gerhard ==================================== Gerhard Navratil Teaching- And Research-Assistant Vienna University of Technology, Austria Institute for Geoinformation Gusshausstr. 27-29 1040 Vienna Tel.: ++43 (0) 1 / 58 801 - 12721 Fax.: ++43 (0) 1 / 58 801 - 12799 Cel.: ++43 (0) 699 / 197 44 761 http://www.geoinfo.tuwien.ac.at