Basic Gauge

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

Section

A basic gauge uses Indicator.new(mode: "gauge+number", ...). The gauge.axis.range sets the scale — [nil, max] lets Plotly auto-determine the lower bound (equivalent to JS null). This is the same as notebook 06 (single angular gauge) but without a delta.

alias Plotly.{Figure, Indicator}

Figure.new()
|> Figure.add_trace(
  Indicator.new(
    mode: "gauge+number",
    value: 270,
    title: %{text: "Speed"},
    gauge: %{axis: %{range: [nil, 500]}},
    domain: %{x: [0, 1], y: [0, 1]}
  )
)
|> Figure.update_layout(width: 600, height: 400)
|> Plotly.show()