Line Polar Plot

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

Section

Scatterpolar.new(r:, theta:, mode: "lines") draws a line on polar axes. theta: values are in degrees by default (0 = right, increases counter-clockwise). thetaunit: "radians" switches to radians. r: is the distance from the centre.

alias Plotly.{Figure, Scatterpolar}

theta = Enum.map(0..360, fn d -> d end)
r     = Enum.map(theta, fn d -> :math.cos(d * :math.pi() / 180 * 4) + 1.5 end)

Figure.new()
|> Figure.add_trace(
  Scatterpolar.new(
    r: r,
    theta: theta,
    mode: "lines",
    name: "Rose curve",
    line: %{color: "steelblue"}
  )
)
|> Figure.update_layout(title: "Line Polar Plot — Rose Curve")
|> Plotly.show()