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      A set of macros for drawing high-quality electric circuits
      containing fundamental elements, amplifiers, transistors, and
      basic logic gates to include in TeX, LaTeX, or similar
      documents. Some tools and examples for other types of diagrams
      are also included. The macros evaluate to drawing commands in
      the pic language, which is very easy to understand and which has
      a good power/complexity ratio.  Pic contains elements of a
      simple programming language, and is well-suited to line drawings
      requiring parametric or conditional components, fine tuning,
      significant geometric calculations or repetition, or that are
      naturally block structured or tree structured.  The m4 and pic
      processors are readily available for Unix and PC machines.
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