[pbafgvuz] offset edges from a square grid

create a grid of unit squares out of line segments of length 2.  at each vertex meet the endpoints of two segments and the midpoint of an orthogonal segment.

randomly shift each segment.  (many ways to do this.)  lengthen or shorten segments to maintain adjacencies.  most intersections will become T junctions.  square grid becomes ugly.

inspired by a poorly planned road network with a lot of T junctions, sometimes two close T junctions controlled awkwardly by one set of traffic lights.