Compiling to .pdf

Problem Compiling in Pdf. Pdf is the default compiler for Mixtex 2.9. This
does not give diagrams that functioned in 2.7, compiling to a .dvi file.
At the begining of a document I include the lines
\def\jwline#1#2#3#4{%
\put(#1,#2){\special{em:moveto}}%
\put(#3,#4){\special{em:lineto}}}
\def\newpic#1{}
then a command, \jwline{40}{90}{50}{80}, draws a precise line. This 
compiles
under Miktex 9.5, but the lines don't show. Any suggestions on how to make
this work compiling to pdf files.
Thanks,
Ed. MacKinnon

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