apps/census-app/helpers.r

In rappster/shinyref: What the package does (short line)

# install.packages(c("maps", "mapproj"))

# library(maps)
# library(mapproj)
# source("apps/census-app/helpers.R")
# counties <- readRDS("apps/census-app/data/counties.rds")
# percent_map(counties$white, "blue", "% white")

# Note: percent map is designed to work with the counties data set
# It may not work correctly with other data sets if their row order does
# not exactly match the order in which the maps package plots counties
percent_map <- function(var, color, legend.title, min = 0, max = 100) {

  # generate vector of fill colors for map
  shades <- colorRampPalette(c("white", color))(100)

  # constrain gradient to percents that occur between min and max
  var <- pmax(var, min)
  var <- pmin(var, max)
  percents <- as.integer(cut(var, 100,
    include.lowest = TRUE, ordered = TRUE))
  fills <- shades[percents]

  # plot choropleth map
  map("county", fill = TRUE, col = fills,
    resolution = 0, lty = 0, projection = "polyconic",
    myborder = 0, mar = c(0,0,0,0))

  # overlay state borders
  map("state", col = "white", fill = FALSE, add = TRUE,
    lty = 1, lwd = 1, projection = "polyconic",
    myborder = 0, mar = c(0,0,0,0))

  # add a legend
  inc <- (max - min) / 4
  legend.text <- c(paste0(min, " % or less"),
    paste0(min + inc, " %"),
    paste0(min + 2 * inc, " %"),
    paste0(min + 3 * inc, " %"),
    paste0(max, " % or more"))

  legend("bottomleft",
    legend = legend.text,
    fill = shades[c(1, 25, 50, 75, 100)],
    title = legend.title)
}