Add variable size and color of circle marker depending on condition

Question

Hey folks!! I'm new to leaflet, Can anyone help me with the below requirement.

Add variable size and color of circle marker depending on condition.

Dataset: Ozone

Condition: I want marker color to be red, green and yellow depending on high, low and medium.

I also want to know condition to apply size of markers depending on similar condiiton.

Thanks,

CJ

Answer 1

Hey,

Give conditions for color or radius within addCircleMarkers as below.

Example -

For variable size

leaflet(df) %>% addTiles() %>%
  addCircleMarkers(
    radius = ~ifelse(field > 50, 6, 10),
  )

For variable color-

Create a function to decide the color

func = colorNumeric(c("green","yellow","red"), domain = NULL)

or

func = colorNumeric(c("green","yellow","red"), domain = NULL,bins = 3)

call the function as below.

leaflet(df) %>% addTiles() %>%
  addCircleMarkers(
    color = func(sort(~field))
  )

Hope it helps!