将 choropleth map 转换为 R 中的气泡 map

Question

I am quite a beginner in R and have made a choropleth world map based on frequencies that different countries were mentioned. I would like to transform it into a bubble map, where the size of the bubble represents the frequency. I think I am just missing one command to take it from the fill to the bubbles but am unsure what to change/add.

example of choropleth map which I want to transform to bubble map

map1<-ggplot(mapdata, aes( x = long.x, y = lat.x, group=group)) + 
  geom_polygon(aes(fill = count), color = "black") +
   ggtitle("Frequency of mentions") + 
  theme(plot.title = element_text(lineheight=1, face="bold"))
map1

map2 <- map1 + scale_fill_gradient(name = "Frequency Response", low = "blue", high =  "red", na.value = "grey50")+
  theme(axis.text.x = element_blank(),
        axis.text.y = element_blank(), 
        axis.ticks = element_blank(), 
        axis.title.y=element_blank(), 
        axis.title.x=element_blank(), 
        rect = element_blank())
map2

A snipped of my mapdata dataset is: (where count is then the frequency the country was mentioned)

long.x    lat.x group order region subregion long.y lat.y count

1 -69.89912 12.45200     1     1  Aruba      <NA>   <NA>  <NA>    NA
2 -69.89571 12.42300     1     2  Aruba      <NA>   <NA>  <NA>    NA
3 -69.94219 12.43853     1     3  Aruba      <NA>   <NA>  <NA>    NA

Thanks for any advice and help!

Answer 1

I haven't used it I'm afraid, but the packcircles package in combination with ggplot2 looks promising?

https://r-graph-gallery.com/circle-packing.html