Make it circular and contextual!

In Dr. Geo, to edit a sketch, the user frequently changes its editing mode: to construct point, segment, straight line, ray, line, move a geometric object, etc. There are tenth of editing modes. To switch from one mode to another one, the user selects a specific menu entry or click on a specific button. In the following paragraph, I discuss about a circular toolbar design.

Switching between Dark and Light Themes

OK I must write this down as I should ask Hilaire for help the third time about this simple task.