Adding Provinces to Canadian Map in R - r

Question

I've been browsing a lot of the topics on mapping in R and would appreciate a little help.
I've made it to this code which builds an image of a purchase density then overlays a US State map on top and a Canadian national map as well.
It's an ok solution, but Ideally I'd like to show the provinces in Canada as well.
library(mapdata);
library(maps);
library(maptools);
library(spatstat);
png(filename=file_name, type="cairo-png", bg="transparent", width=10.*960, height=10.*960, pointsize=1);
spatstat.options(npixel=c(1000,1000));
densitymap<-density(points, sigma=0.15, weights=dedupedMergedZips[!is.na(dedupedMergedZips$longitude), zipCount]);
my.palette <- colorRampPalette(c("#3F3F3F","#e2ffcc","#b6ff7f","white"), bias=2, space="rgb")
image(densitymap, col=my.palette(200));
map("state", col="grey", fill=FALSE, bg="transparent", lwd=3.0, xlim=longitudeLimits, ylim=latitudeLimits, add = TRUE);
map("worldHires","Canada", xlim=longitudeLimits, ylim=latitudeLimits, col="grey", fill=FALSE, bg="transparent", lwd=3.0, add=TRUE)
dev.off()
Any tips on how I could add an additional Arguement to the second line to get the provinces to show?
Thanks

Answer 1

Here is a solution, based on leaflet:
library(rgdal)
if (!file.exists("./src/ref/ne_50m_admin_1_states_provinces_lakes/ne_50m_admin_1_states_provinces_lakes.dbf")){
download.file(file.path('http://www.naturalearthdata.com/http/',
'www.naturalearthdata.com/download/50m/cultural',
'ne_50m_admin_1_states_provinces_lakes.zip'),
f <- tempfile())
unzip(f, exdir = "./src/ref/ne_50m_admin_1_states_provinces_lakes")
rm(f)
}
region <- readOGR("./src/ref/ne_50m_admin_1_states_provinces_lakes", 'ne_50m_admin_1_states_provinces_lakes', encoding='UTF-8')
library(leaflet)
leaflet() %>%
addTiles() %>%
setView(-74.09, 45.7, zoom = 3) %>%
addPolygons(data = subset(region, name %in% c("British Columbia", "Alberta", "Saskatchewan", "Manitoba", "Ontario", "Quebec", "New Brunswick", "Prince Edward Island", "Nova Scotia", "Newfoundland and Labrador", "Yukon", "Northwest Territories", "Nunavut")),
fillColor = topo.colors(10, alpha = NULL),
weight = 1)
Here is another proposal leveraging ggplot2:
library(ggplot2)
regions <- subset(region, name %in% c("British Columbia", "Alberta", "Saskatchewan", "Manitoba", "Ontario", "Quebec", "New Brunswick", "Prince Edward Island", "Nova Scotia", "Newfoundland and Labrador", "Yukon", "Northwest Territories", "Nunavut")) # region is defined in the first part of the code (see above)
ggplot(regions) +
aes(long,lat, group = group, fill = group) +
geom_polygon() +
geom_path(color="white") +
coord_equal() +
guides(fill = FALSE)