Custom Colorscale

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

Section

A custom colorscale is a list of [stop, color] pairs where stop ranges from 0.0 to 1.0. Colors can be CSS names, hex strings, or "rgb(r,g,b)".

alias Plotly.{Figure, Heatmap}

z = for i <- 0..9, do: (for j <- 0..9, do: :math.sin(i / 3.0 + j / 5.0) * 10)

Figure.new()
|> Figure.add_trace(Heatmap.new(
  z: z,
  colorscale: [
    [0.0, "navy"],
    [0.25, "royalblue"],
    [0.5, "white"],
    [0.75, "orange"],
    [1.0, "red"]
  ]
))
|> Figure.update_layout(title: "Custom Colorscale Heatmap")
|> Plotly.show()