Here is a list of all documented struct and union fields with links to the struct/union documentation for each field:

data : Grids
height : Grids
num_regions : Connectors
regions : Connectors
used : Connectors
width : Grids
x : Connectors
x1 : Rooms
x2 : Rooms
y : Connectors
y1 : Rooms
y2 : Rooms