Assigning colors to nodes and links in a Sankey chart using GoogleVis package in R

[Phil Straforelli]

I have 3 categories (A, B, C) that repeat 3 times (A1, A2, A3, for A, and so forth). I'd like each of those 3 categories to have the same colour, so A is always blue across the 3 times it appears, B is always orange, C is always green. I'd also like that done with the links, with some gradient as it goes from one node to the next. Here's some R code to replicate what I'm getting:

datSK <- data.frame(From=c(rep("A1",3), rep("B1", 3), rep("C1", 3), rep("A2", 3), rep("B2", 3), rep("C2",3)), To=c(rep(c("A2", "B2", "C2"), 3), rep(c("A3", "B3", "C3"), 3)), Weight=c(5,7,6,2,9,4,3,4,5)) library(GoogleVis)

plot(gvisSankey(datSK, from="From", to="To", weight="Weight", options=list(sankey="{ link: { colorMode: 'gradient', colors: ['blue', 'orange', 'green']}, node: { colors: ['blue', 'orange', 'green']}}")))

The links and their gradients appear to work fine, but I can't figure out the logic behind the assignment of the colors for the nodes and links. Can it be explained so that I can determine how to apply the colours as described above?

[Daniel LaLiberte]

Phil,

The order of the nodes in the layout is somewhat unpredictable, depending on the number of iterations that you allow and the complexity of the network.  

But the order of the nodes as they appear in the datatable is, I believe, used to determine which color is assigned to each node, independent of the eventual layout of the nodes.  It appears the From nodes are assigned a color separately from the To nodes, and each cycles through the colors in order of first appearance.

Something similar might occur for links, with each row corresponding to a link.  The colors specified for links are then used cyclically in that same order.   But additionally, the link color can be assigned using a 'style' role.  

This is somewhat of a guess, and based on minimal experimentation, so I hope I am not misleading you.

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Daniel LaLiberte

dlaliberte@Google.com   5CC, Cambridge MA