Chambers in a Castle

The floor plan of a castle indicates where the walls are.
The outer boundary of the castle is always an unbroken wall.
The castle has no doors, only openings in the walls that lead from
one room to another.
A chamber is a collection of rooms that are connected to each other by gaps in the walls.
Design your own "Chambers in a Castle" (the code has Jordan Curve Method).
Each room is colored to differentiate with others.