Smoothing Contour Lines

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

Section

line: %{smoothing: N} controls how curved the contour lines are.

• 0 — straight line segments between grid points (sharp)
• 1.3 — maximum smoothing (curved, spline-like)

alias Plotly.{Figure, Contour}

z = for i <- 0..9 do
  for j <- 0..9 do
    :math.sin(i / 3.0) * :math.cos(j / 3.0)
  end
end

for smoothing <- [0, 0.65, 1.3] do
  Figure.new()
  |> Figure.add_trace(
    Contour.new(z: z, line: %{smoothing: smoothing}, colorscale: "Portland")
  )
  |> Figure.update_layout(title: "Contour Line Smoothing: #{smoothing}")
  |> Plotly.show()
end
|> Kino.Layout.grid(columns: 3)