improvement: add .apply_selection() to mo.ui.altair_chart for layered/stacked charts

[mscolnick]

Adds .apply_selection to a altair_chart widget:

Apply the selection to a DataFrame.

This method is useful when you have a layered chart and you want to apply the selection to a DataFrame.

Example.

  import altair as alt
  import marimo as mo
  from vega_datasets import data

  cars = data.cars()

  _chart = (
      alt.Chart(cars)
      .mark_point()
      .encode(
          x="Horsepower",
          y="Miles_per_Gallon",
          color="Origin",
      )
  )

  chart = mo.ui.altair_chart(_chart)
  chart

  # In another cell
  selected_df = chart.apply_selection(cars)

Args.

• df: a Pandas DataFrame to apply the selection to

  Returns.

• a Pandas DataFrame of the plot data filtered by the selections

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🚀 Development release published. You may be able to view the changes at https://marimo.app?v=0.6.15-dev5