This is an extension for Visual Studio 2013 onwards.

It does two things:

• it provides a dockable window inside Visual Studio with a cartesian coordinate grid drawn on it.
• it provides a service for other extensions who want to draw some 2D line geometry on the grid.

I use this myself in conjunction with a UIVisualizer (See near the bottom of https://msdn.microsoft.com/en-us/library/jj620914.aspx) to help me in debugging 2D geometry algorithms. (Maybe I'll upload a stripped down version of my visualizer project as an example.)