Add Steps and Threshold

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

Section

gauge.steps: and gauge.threshold: work on bullet charts exactly as on angular gauges. Steps add colored bands along the bullet bar; the threshold marker shows a target value.

alias Plotly.{Figure, Indicator}

Figure.new()
|> Figure.add_trace(
  Indicator.new(
    mode: "number+gauge+delta",
    value: 220,
    title: %{text: "Profit"},
    delta: %{reference: 200},
    gauge: %{
      shape: "bullet",
      axis: %{range: [nil, 300]},
      steps: [
        %{range: [0, 150], color: "lightgray"},
        %{range: [150, 250], color: "gray"}
      ],
      threshold: %{
        line: %{color: "red", width: 2},
        thickness: 0.75,
        value: 280
      }
    },
    domain: %{x: [0, 1], y: [0, 1]}
  )
)
|> Figure.update_layout(width: 600, height: 250)
|> Plotly.show()