Rectangle Positioned Relative to the Axes

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

Section

Both xref: "x" and yref: "y" anchor the rectangle to data coordinates. The rectangle resizes with zoom.

alias Plotly.{Figure, Scatter}

Figure.new()
|> Figure.add_trace(Scatter.new(x: [1.5, 2.5], y: [1.5, 2.5], mode: "markers", marker: %{size: 10}))
|> Figure.update_layout(
  title: "Rectangle Relative to Axes",
  xaxis: %{range: [0, 4]},
  yaxis: %{range: [0, 4]},
  shapes: [
    %{
      type: "rect",
      xref: "x",
      yref: "y",
      x0: 1,
      y0: 1,
      x1: 3,
      y1: 3,
      fillcolor: "LightGreen",
      opacity: 0.4,
      line: %{color: "DarkGreen", width: 2}
    }
  ]
)
|> Plotly.show()