Description

This watch face is the same as my "Percentages" watch face, but with a black background instead of the green one. Read the description for the original versión, which also applies to thisone.

I did this versión because of a fan request 
(: a fan is a fan :)
and also because I sincerely do not know how to set up an options dialog, which I guess is the best solution.

So, I want to ask to my fellow C developers out there for a link to a web page or a tutorial showing the proper way to do this "options dialog handling and setting up", please.