Add Links

Mix.install([
  {:plotly_ex, "~> 0.3"},
  {:kino, "~> 0.18"}
])

Section

Style links via link.color (list of rgba strings) and link.label (list of hover labels). Use rgba(r, g, b, a) with low alpha (e.g. 0.4) for transparent flows.

alias Plotly.{Figure, Sankey}

Figure.new()
|> Figure.add_trace(
  Sankey.new(
    node: %{
      label: ["Coal", "Natural Gas", "Oil", "Electricity", "Losses"],
      color: ["black", "blue", "brown", "gold", "gray"],
      pad: 20,
      thickness: 30,
      line: %{color: "black", width: 0.5}
    },
    link: %{
      source: [0, 1, 2, 0, 1],
      target: [3, 3, 3, 4, 4],
      value:  [25, 20, 30, 10, 15],
      color: [
        "rgba(0,0,0,0.4)",
        "rgba(0,0,255,0.4)",
        "rgba(139,69,19,0.4)",
        "rgba(0,0,0,0.2)",
        "rgba(0,0,255,0.2)"
      ],
      label: [
        "Coal → Electricity",
        "Gas → Electricity",
        "Oil → Electricity",
        "Coal → Losses",
        "Gas → Losses"
      ]
    }
  )
)
|> Figure.update_layout(title: "Sankey — Styled Links", width: 800, height: 500)
|> Plotly.show()