Google Charts has overlay functionality that allows you to put an image over a plot at a specified position. Is this possible in the googleVis
package or do I need to edit the chart html
ad hoc to include an overlay?
You can add an overlay to a Google map using my googleway
package. To use Google Maps you need a valid API key
library(googleway)
map_key <- 'your_api_key'
google_map(key = map_key) %>%
add_overlay(north = 40.773941,south = 40.712216, east = -74.12544, west = -74.22655,
overlay_url = "https://www.lib.utexas.edu/maps/historical/newark_nj_1922.jpg")
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