Create Sankey Canvas

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

Section

Before styling individual elements, set the overall canvas size and font via layout. layout.font sets the default text size for all node labels.

alias Plotly.{Figure, Sankey}

Figure.new()
|> Figure.add_trace(
  Sankey.new(
    node: %{label: ["Coal", "Natural Gas", "Oil", "Electricity", "Losses"]},
    link: %{
      source: [0, 1, 2, 0, 1],
      target: [3, 3, 3, 4, 4],
      value:  [25, 20, 30, 10, 15]
    }
  )
)
|> Figure.update_layout(
  title: "Energy Flow",
  width: 800,
  height: 500,
  font: %{size: 12}
)
|> Plotly.show()