New feature to have Stacked or nested bubbles sizeson legend when plotting bubbles in tmap

[tomroh]

See https://github.com/r-tmap/tmap/issues/777.

[tomroh]

034cdbbe5adae872bb4756030494acea7d12c8fb

addSizeLegend gains an argument stacked that will produce stacked size charts. This works for all available shapes but only circle, rect, and triangle are recommended.

library(leaflet)
library(leaflegend)
data("quakes")
baseSize <- 5
numPal <- colorNumeric('viridis', 10^(quakes$mag))
leaflet(quakes) |>
  addTiles() |>
  addLegendSize(
    values = ~10^(mag),
    title = 'Magnitude',
    baseSize = baseSize,
    shape = 'circle',
    color = 'black',
    fillColor = 'red',
    position = 'topright',
    stacked = TRUE,
    breaks = 5,
    strokeWidth = 2) |>
  addLegendSize(
    values = ~10^(mag),
    title = 'Magnitude',
    baseSize = baseSize,
    shape = 'triangle',
    color = 'black',
    fillColor = 'red',
    position = 'topright',
    stacked = TRUE,
    breaks = 5,
    strokeWidth = 2) |>
  addLegendSize(
    values = ~10^(mag),
    title = 'Magnitude',
    baseSize = baseSize,
    shape = 'diamond',
    color = 'black',
    fillColor = 'red',
    position = 'topright',
    stacked = TRUE,
    breaks = 5,
    strokeWidth = 2) |>
  addLegendSize(
    values = ~10^(mag),
    title = 'Magnitude',
    baseSize = baseSize,
    shape = 'stadium',
    color = 'black',
    fillColor = 'red',
    position = 'topright',
    stacked = TRUE,
    breaks = 5,
    strokeWidth = 2)