On Feb 18, 2018, at 12:00 PM, pd-list-request@lists.iem.at wrote:

From: Roman Haefeli <reduzent@gmail.com>
To: Pd-List <pd-list@lists.iem.at>
Subject: Re: [PD] snap to grid feature when editing
Message-ID: <1518895171.2184.17.camel@gmail.com>
Content-Type: text/plain; charset="utf-8"

On Sam, 2018-02-17 at 19:26 +0100, Dan Wilcox wrote:

There is working code for this in one of the Pd forks. I've thought
about porting it over. It works pretty well for placement but drawing
the actual grid is problematic due to the number of lines and some
overlapping.

I wasn't thinking about drawing lines on the canvas. I thought more of
an invisible feature that could be turn on and off by some shortcut.