This reminds me of the PGF manual: http://mirror.ctan.org/graphics/pgf/base/doc/generic/pgf/pgfmanual.pdf http://mirror.ctan.org/graphics/pgf/base/doc/generic/p

This reminds me of the PGF manual: http://mirror.ctan.org/graphics/pgf/base/doc/generic/pgf/pgfmanual.pdf http://mirror.ctan.org/graphics/pgf/base/doc/generic/pgf/pgf... In section 7.6 Plots and Charts the author explains very clearly the typical issues with bar diagrams and pie charts. Moreover, the whole chapter 7 Guidelines on Graphics is worth reading even for those who are not interested in the PGF package. The PGF manual is one of the best introductions into that topic I'm aware of.