Hi,
if anybody is interested in programming a Smith chart (used for display of complex numbers, like impedances), here is my well-tested Delphi pascal source code.
Originally I made it for Turbo Pascal and DOS, since years I have it in Delphi. It is quite beautiful, but not yet object-oriented. It would be nice of course if someone could merge it into the great Lazarus Tchart.
Attached is a zip with example s-parameter files and a program which can load these, and display a Smith chart or others (like polar or cartesian), I have also another zip with Delphi sources. Much of the code I have in Lazarus, but not all.
I have also a bigger Smith chart program, which can be used to design matching networks in a Smith chart. To run the program, you may need some standard Delphi dll's.
Bye Stephan