Web Scrape an Image with rvest R - html

Question

I'm having a problem when trying to scrape an image from this page. My code is as follow:
library(rvest)
url <- read_html("https://covid-19vis.cmm.uchile.cl/chart")
m <- '/html/body/div/div/div[4]/main/div/div/div/div/div/div[2]/div[1]'
grafico_cmm <- html_node(url, xpath = m) %>% html_attr('src')
When I run the above code, the result is NA. Does someone know how can I scrape the plot or maybe the data from the page?
Thanks a lot

Answer 1

It not an image, it is an interactive chart. For an image, you would need to scrape the data points and re-create as a chart and then convert to an image. Xpath is also invalid.
The data comes from an API call. I checked the values against the chart and this is the correct endpoint.
library(jsonlite)
data <- jsonlite::read_json('https://covid-19vis.cmm.uchile.cl/api/data?scope=0&indicatorId=57', simplifyVector = T)
The chart needs some tidying but here is a basic plot of the r values:
data$date <- data$date %>% as.Date()
library("ggplot2")
ggplot(data=data,
aes(x=date, y=value, colour ='red')) +
geom_line() +
scale_color_discrete(name = "R Efectivo", labels = c("Chile"))
print tail(data)