R leaflet adding colors for character variables
Extending on MLavoie's comment, you need to define a palette function first. There's a couple ways you can do this, two of which I've illustrated below, with a completely made up data set. Hopefully, it will work for your data as well.
If you don't have a whole lot of factors, and want to set colors manually, you can certainly do that. That's the first pal
function below.
If you have a lot of factors, such that setting colors manually isn't a good option, try using a RColorBrewer palette. That's the second pal
function below. Use whichever you prefer - you don't need both pal
functions, I just included them as a reference. If you want to see all palette name options, call RColorBrewer::display.brewer.all()
.
library('leaflet')
# Fake data
df <- data.frame(lng = c(-5, -10, -15, -20, 25),
lat = c(8, 12, 33, 4, 18),
size = c(200000, 100000, 800000, 250000, 350000),
popup = c('A', 'B', 'C', 'D', 'E'),
type = c('A', 'B', 'C', 'D', 'E'),
stringsAsFactors = FALSE)
# If you want to set your own colors manually:
pal <- colorFactor(
palette = c('red', 'blue', 'green', 'purple', 'orange'),
domain = df$type
)
# If you want to use predefined palettes in the RColorBrewer package:
# Call RColorBrewer::display.brewer.all() to see all possible palettes
pal <- colorFactor(
palette = 'Dark2',
domain = df$type
)
leaflet(df) %>%
addTiles() %>%
addCircles(lng = ~lng, lat = ~lat, weight = 1,
radius = ~size, popup = ~popup, color = ~pal(type))
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dnsko
Updated on January 12, 2020Comments
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dnsko over 4 years
I am attempting to create a Leaflet map in R, but the only thing I would like to add from now on are the colors for the circles that should differ per variable. In my data I have a column
Data.Type
that has approximately 5 different values in the dataset. What I would like is to have circles for these data points, in 5 different colors.output$map <- renderLeaflet({ leaflet() %>% addTiles( urlTemplate = "//{s}.tiles.mapbox.com/v3/jcheng.map-5ebohr46/{z}/{x}/{y}.png" ) %>% setView(lng = x, lat = x, zoom = 4) leaflet(getData()) %>% addTiles() %>% addCircles(lng = ~Longitude, lat = ~Latitude, weight = 1, radius=~Var, popup = ~Var, color=~Data.Type ) })
Only this will return grey-ish circles only, not 5 different. How should this be done?
Edit: Data looks somewhat like this, actually it is more than 20.000 rows
ID Var Var Var Data.Type 0 99 2016 743 Type A 1 99 2016 209 Type B 2 99 2016 349 Type A 3 99 2016 349 Type D 4 99 2016 993 Type A 5 99 2016 122 Type E 6 99 2016 194 Type B 7 99 2016 660 Type A 8 99 2016 221 Type C ...
The idea is to have a color for each var in Data.Type, which can only have approximately 6 different values
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MLavoie over 7 yearsthis rstudio.github.io/leaflet/colors.html will help you get what you want
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Allen Wang over 6 yearsThanks for your answer Sam, spent two days messing around with no luck until I found this!