Represents the sites and runs on a 2D plane so that the distances between
sites on the drawn 2D plane correspond to distances provided to the
solver clarke_wright().
The individual runs are distinguished by color. The demanding site locations are marked with round circles while the (single) supplying site is depicted as a square. The line types (solid/dashed/...) are associated to different vehicle types.
# S3 method for heumilkr_solution
plot(x, ...)A "heumilkr_solution" object, typically obtained by clarke_wright().
Not used.
Distance information between sites only determine site positions on a 2D plane up to rotations and translations: those are fixed arbitrarily.