Feature Request: MarkerCluster Pie Charts and Bar Charts

[ngfrey]

It would be wonderful if it was easy to replicate the example from gisminister linked below, but also specify colors to the pie-charts via either a pal function, a vector of colors, or a dataframe of key-value stores.

Leaflet Pie Chart Markers Example:
http://bl.ocks.org/gisminister/10001728

Likewise, it would be wonderful to also have bar charts, as shown in leaflet.minicharts. Example here : https://cran.r-project.org/web/packages/leaflet.minicharts/vignettes/introduction.html

[trafficonese]

I just published a new branch at leaflet.extras2 which allows to use piecharts, vertical and horizontal barcharts with d3.

You can install the branch with
remotes::install_github("trafficonese/leaflet.extras2", ref = "clustercharts")

Here is a working Shiny-App with Clustercharts

or you can check out these little examples:

library(sf)
library(leaflet)
library(leaflet.extras2)

data <- sf::st_as_sf(breweries91)
categories <- c("Schwer", "Mäßig", "Leicht", "kein Schaden")
data$category <- sample(categories, size = nrow(data), replace = TRUE)
data$label <- sample(breweries91$brewery, size = nrow(data), replace = TRUE)

## Pie Chart
leaflet() %>%
  addProviderTiles("CartoDB.Positron") %>%
  leaflet::addLayersControl(overlayGroups = "clustermarkers") %>%
  addClusterCharts(data = data
                   , categoryField = "category"
                   , options = clusterchartOptions(rmax = 40, innerRadius = 10, size = 10)
                   , categoryMap = data.frame(labels = categories,
                                              colors  = c("#F88", "#FA0", "#FF3", "#BFB"))
                   , group = "clustermarkers"
                   , popupFields = c("brewery", "address", "zipcode", "category")
                   , label = "label"
                   , legendOptions = list(title = "Some special Title", position = "topright")
  )

## Bar Chart
leaflet() %>%
  addProviderTiles("CartoDB.Positron") %>%
  leaflet::addLayersControl(overlayGroups = "clustermarkers") %>%
  addClusterCharts(data = data
                   , type = "bar"
                   # , type = "horizontal"
                   , categoryField = "category"
                   , categoryMap = data.frame(labels = categories,
                                              strokes = "gray")
                   , group = "clustermarkers"
                   , label = "label"
  )

Todos / Ideas:

• Icons only work in a shiny-app so far, should icons be imported, base64 encoded?
• Check if data geometry type is Point?
• Only support Geojson through sf and yyjsonr?
• Other Visualizations? Histograms?
• Other Calculations than d3.max?
• Order title in order of legend or in frequency?

Tell me what you think, if it needs some adjustments or if there is something missing.. 🐝

[trafficonese]

I think #191 is related.

[trafficonese]

I opened a PR trafficonese/leaflet.extras2#69 and will close the issue here