Did you try DrawLine and DrawLines ?

In general, when working with wxPerl it's useful to have the C++ docs of WxWidgets at hand, like this one:

wxDC

They usually fit for wxPerl as well, and sometimes have comments that explain the difference between the C++ and Perl versions. But mostly, the methods are translated 1-to-1.

You can find some samples of wxPerl code here. A sample with DrawLine employed is here.