addCoordinates: Add node coordinates to graph.
In mcMST: A Toolbox for the Multi-Criteria Minimum Spanning Tree Problem

Places node coordinates in the two-dimensional euclidean plane.

1	addCoordinates(graph, n, generator, by.centers = FALSE, par.fun = NULL, ...)

`graph`	[`mcGP`] Multi-objective graph problem.
`n`	[`integer`] Number of coordinates to place. If `by.centers` is `FALSE` a single integer value is expected. Otherwise, a vector v may be passed. In this case v[i] coordinates are generated for each cluster. However, if a single value is passed and `by.center == TRUE`, each cluster is assigned the same number of coordinates.
`generator`	[`function(n, ...)`] Function used to generate coordinates. The generator needs to expect the number of points to generate as the first argument `n`. Additional control argument are possible.
`by.centers`	[`logical(1)`] Should coordinates be placed for each cluster center seperately? This enables geneation of clustered coordinates. Default is `FALSE`.
`par.fun`	[`function(cc) \| NULL`] Optional function which is applied to each cluster center `cc` before the generation of coordinates in case `by.centers` is `TRUE`. This enables to specifically determine additional parameters for the `generator` for each cluster.
`...`	[any] Furhter arguments passed down to `generator`.