Computing the path according to the provided method
The turns
The number of columns of 2d plots (>= 1) or one of "letter", "square", "A4", "golden", "legal". Note that n2dcols is ignored if turns is not NULL.
The number of 2d plots to be laid out
A character string indicating the method according to which the path is built
A logical indicating whether the first 1d plot should be plotted
A logical indicating whether the last 1d plot should be plotted
the path, a list containing the turns, the positions (indices in the occupancy matrix) and the the occupancy matrix