Venn Diagram with Circle Shapes

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

Section

Overlapping circle shapes with transparency create a Venn diagram effect. Use fillcolor with rgba for transparency and position circles using paper coordinates.

alias Plotly.{Figure, Scatter}

Figure.new()
|> Figure.add_trace(
  Scatter.new(
    x: [1, 2, 1.5],
    y: [1, 1, 1.75],
    mode: "text",
    text: ["A", "B", "A∩B"],
    textfont: %{size: 18, color: "white"}
  )
)
|> Figure.update_layout(
  title: "Venn Diagram",
  xaxis: %{range: [0, 3], showgrid: false, zeroline: false, showticklabels: false},
  yaxis: %{range: [0, 3], showgrid: false, zeroline: false, showticklabels: false},
  plot_bgcolor: "white",
  shapes: [
    %{
      type: "circle",
      xref: "x",
      yref: "y",
      x0: 0.2,
      y0: 0.2,
      x1: 2.2,
      y1: 2.2,
      fillcolor: "rgba(55, 128, 191, 0.6)",
      line: %{color: "rgba(55, 128, 191, 1)"}
    },
    %{
      type: "circle",
      xref: "x",
      yref: "y",
      x0: 0.8,
      y0: 0.2,
      x1: 2.8,
      y1: 2.2,
      fillcolor: "rgba(255, 127, 14, 0.6)",
      line: %{color: "rgba(255, 127, 14, 1)"}
    }
  ]
)
|> Plotly.show()