How can values be shown on the links/paths of a Sankey Graph in R programming?

Story

While attempting to recreate a Sankey graph similar to the one shown in the image below, I aimed to assign specific values (10, 20, 30, 40) to the paths connecting different nodes.

https://i.sstatic.net/U3erS.png

My Approach

Initially, I used the Python Plotly library for this task. However, I discovered that Plotly does not provide direct support for setting values along the links or paths of a Sankey graph. Subsequently, I switched to R due to its wider range of resources available. Nevertheless, I encountered the same issue even in R. Despite consulting various tutorials and Q&A threads on Stack Overflow related to Sankey graphs in R (such as this one), I have been unable to find a solution where the path values are displayed.

Main Concern

I am seeking guidance on how to showcase values on the links/paths of a Sankey Graph using R.

Please Note: The questions on Stack Overflow mentioned here (link1 and link2) appear relevant, but I am struggling to implement their solutions in my own code snippets.

Sample Code Snippet (excerpted from here)

# install.packages('networkD3')
library(networkD3)
nodes = data.frame("name" = 
 c("Node A", # Node 0
 "Node B", # Node 1
 "Node C", # Node 2
 "Node D"))# Node 3
links = as.data.frame(matrix(c(
 0, 1, 10, # Each row represents a link. The first number
 0, 2, 20, # represents the node being conntected from. 
 1, 3, 30, # the second number represents the node connected to.
 2, 3, 40),# The third number is the value of the node
 byrow = TRUE, ncol = 3))
names(links) = c("source", "target", "value")


 sankeyNetwork(Links = links, Nodes = nodes,
 Source = "source", Target = "target",
 Value = "value", NodeID = "name",
 fontSize= 50, nodeWidth = 30)
javascriptrd3.jssankey-diagramnetworkd3

Answer №1

To implement this functionality, you can utilize custom JavaScript code by injecting it during the rendering process using htmlwidgets::onRender(). The following example demonstrates how to initially position the link labels correctly. However, if the nodes are manually rearranged, the link labels will not automatically adjust accordingly. To address this issue, you may need to override the default behavior of dragmove.

library(htmlwidgets)
library(networkD3)

nodes <- 
  data.frame(
    name = c("Node A", "Node B", "Node C", "Node D")
  )

links <- 
  data.frame(
    source = c(0, 0, 1, 2),
    target = c(1, 2, 3, 3),
    value = c(10, 20, 30, 40)
  )

p <- sankeyNetwork(Links = links, Nodes = nodes,
                   Source = "source", Target = "target",
                   Value = "value", NodeID = "name",
                   fontSize= 20, nodeWidth = 30)

htmlwidgets::onRender(p, '
  function(el) { 
    var nodeWidth = this.sankey.nodeWidth();
    var links = this.sankey.links();
        
    links.forEach((d, i) => {
      var startX = d.source.x + nodeWidth;
      var endX = d.target.x;
      
      var startY = d.source.y + d.sy + d.dy / 2;
      var endY = d.target.y + d.ty + d.dy / 2;
      
      d3.select(el).select("svg g")
        .append("text")
        .attr("text-anchor", "middle")
        .attr("alignment-baseline", "middle")
        .attr("x", startX + ((endX - startX) / 2))
        .attr("y", startY + ((endY - startY) / 2))
        .text(d.value);
    })
  }
')

https://i.sstatic.net/RyHcg.png

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