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jebyrnes/leafletMapWithLegend.R

Last active August 29, 2015 14:19
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A demo of leaflet using a color legend
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leafletMapWithLegend.R
#devtools::install_github("rstudio/leaflet", ref="feature/color-legend")
library(leaflet)
library(RColorBrewer)
set.seed(100)
pdf <- data.frame(Latitude = runif(100, -90,90), Longitude = runif(100, -180,180))
#make a property with colors
pdf$Study <- rep(1:10,10)
#need to create a pal using colorbin
pal = colorBin('RdYlBu', as.numeric(pdf$Study), 5)
#the map with a legend
leaflet(pdf) %>% addTiles() %>%
addCircleMarkers(lat = ~ Latitude, lng = ~ Longitude, color= pal(pdf$Study)) %>%
addLegend(pal = pal, values = pdf$Study, title="Study")
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