Mailing the story:

Every so often, I find myself needing to calculate complementary colors. For example, I might be making a line graph in a web app or bar graphs for a report. When this happens, I want to use complementary colors to have the maximum "visual difference" between the lines or bars. Many online resources explain how to do this and offer formulas, but I think it's high time for a Groovy color calculator. So please follow along.