Animating the Data

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

Section

Frame-based animation: pre-compute all states as a frames list, add a layout.updatemenus Play button. Click ▶ Play to animate.

Each frame is a plain map %{name: "frameN", data: [partial_trace_update]}. The data list has one entry per trace — only changed keys are needed.

alias Plotly.{Figure, Scatter}

n_frames = 50
frames =
  for i <- 1..n_frames do
    x = Enum.to_list(0..i)
    y = Enum.map(x, fn xi -> :math.sin(xi * 0.3) + :math.cos(xi * 0.1) end)
    %{name: "f#{i}", data: [%{x: x, y: y}]}
  end

Figure.new(
  data: [Scatter.new(x: [0], y: [0.0], mode: "lines", name: "wave")],
  layout: %{
    title: "Animating the Data",
    xaxis: %{range: [0, n_frames], autorange: false},
    yaxis: %{range: [-2.2, 2.2], autorange: false},
    updatemenus: [%{
      type: "buttons",
      showactive: false,
      y: 0,
      x: 0.5,
      xanchor: "center",
      buttons: [%{
        label: "▶ Play",
        method: "animate",
        args: [nil, %{frame: %{duration: 50, redraw: false}, transition: %{duration: 0}}]
      }, %{
        label: "⏸ Pause",
        method: "animate",
        args: [[nil], %{mode: "immediate", frame: %{duration: 0}}]
      }]
    }]
  },
  frames: frames
)
|> Plotly.show()