In vegawidget/altair: Interface to 'Altair'

Tooltips have changed - and so shall this article. Watch this space.

library("altair")

vega_data <- import_vega_data()

chart <- 
  alt$Chart(vega_data$cars$url)$
  mark_point()$
  encode(
    x = "Horsepower:Q",
    y = "Miles_per_Gallon:Q",
    color = "Origin:N"
  )

chart

For the time-being, we can make tooltips only for a single encoding. We are waiting for the Altair package to catch-up to the vega-tooltip changes; the Altair folks are waiting for their renderers to catch up.

chart <- 
  alt$Chart(vega_data$cars$url)$
  mark_point()$
  encode(
    x = "Horsepower:Q",
    y = "Miles_per_Gallon:Q",
    color = "Origin:N",
    tooltip = list(
      alt$Tooltip(field = "Miles_per_Gallon", type = "quantitative"),
      alt$Tooltip(field = "Horsepower", type = "quantitative")
    )
  )

chart

examine(chart)

vegawidget/altair documentation built on Feb. 3, 2024, 7:47 p.m.