The U.S. Census Bureau recently launched a Data Visualization Standards (DVS) website (still in Beta), that has the goal of providing guidelines for creating visualizations. The site is still in it’s infancy, but there is a guide to different chart types that you might find helpful.
Although it’s still in beta, it would be worth bookmarking and seeing what it grows into. On the main page, it says that their code library is coming soon, so that could be cool. If we hear more or see new features, we’ll let you know.
They have a link you can click if you wan to provide feedback or suggestions, so you can add your suggestions too.