Fully Opaque

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

Section

By default, Plotly markers are fully opaque (opacity: 1.0). This notebook shows the distinction between a fully opaque trace and a semi-transparent one side by side, to illustrate the baseline.

alias Plotly.{Figure, Scatter}

xs = [1, 2, 3, 4, 5]
ys_a = [3, 5, 2, 6, 4]
ys_b = [2, 4, 3, 5, 3]

Figure.new()
|> Figure.add_trace(Scatter.new(
  x: xs, y: ys_a,
  mode: "markers",
  name: "Fully opaque (opacity: 1.0)",
  opacity: 1.0,
  marker: %{size: 20, color: "steelblue"}
))
|> Figure.add_trace(Scatter.new(
  x: xs, y: ys_b,
  mode: "markers",
  name: "Semi-transparent (opacity: 0.3)",
  opacity: 0.3,
  marker: %{size: 20, color: "tomato"}
))
|> Figure.update_layout(title: "Fully Opaque vs Semi-Transparent Trace")
|> Plotly.show()