cartography (version 3.1.4)

legendChoro: Legend for Choropleth Maps

Description

Plot legend for choropleth maps.

Usage

legendChoro(
  pos = "topleft",
  title.txt = "Title of the legend",
  title.cex = 0.8,
  values.cex = 0.6,
  breaks,
  col,
  cex = 1,
  values.rnd = 2,
  nodata = TRUE,
  nodata.txt = "No data",
  nodata.col = "white",
  frame = FALSE,
  symbol = "box",
  border = "black",
  horiz = FALSE
)

Arguments

pos

position of the legend, one of "topleft", "top", "topright", "right", "bottomright", "bottom", "bottomleft", "bottomleftextra", "left" or a vector of two coordinates in map units (c(x, y)).

title.txt

title of the legend.

title.cex

size of the legend title.

values.cex

size of the values in the legend.

breaks

break points in sorted order to indicate the intervals for assigning the colors. Note that if there are nlevel colors (classes) there should be (nlevel+1) breakpoints. It is possible to use a vector of characters.

col

a vector of colors.

cex

size of the legend. 2 means two times bigger.

values.rnd

number of decimal places of the values in the legend.

nodata

if TRUE a "no data" box or line is plotted.

nodata.txt

label for "no data" values.

nodata.col

color of "no data" values.

frame

whether to add a frame to the legend (TRUE) or not (FALSE).

symbol

type of symbol in the legend 'line' or 'box'

border

color of the box borders

horiz

layout of legend, TRUE for horizontal layout

Examples

library(sf)
mtq <- st_read(system.file("gpkg/mtq.gpkg", package="cartography"))
plot(st_geometry(mtq))
box()
legendChoro(pos = "bottomleft", title.txt = "Title of the legend", title.cex = 0.8,
            values.cex = 0.6, breaks = c(1,2,3,4,10.27,15.2),
            col = carto.pal(pal1 = "orange.pal",n1 = 5), values.rnd =2,
            nodata = TRUE, nodata.txt = "No data available", frame = TRUE, symbol="box")
legendChoro(pos = "bottomright", title.txt = "Title of the legend", title.cex = 0.8,
            values.cex = 0.6, breaks = c(1,2,5,7,10,15.27),
            col = carto.pal(pal1 = "wine.pal",n1 = 5), values.rnd = 0,
            nodata = TRUE, nodata.txt = "NA",nodata.col = "black",
            frame = TRUE, symbol="line")
legendChoro(pos = "topright", title.txt = "Title of the legend", title.cex = 0.8,
            values.cex = 0.6,
            breaks = c(0,"two","100","1 000","10,000", "1 Million"),
            col = carto.pal(pal1 = "orange.pal",n1 = 5), values.rnd =2,
            nodata = TRUE, nodata.txt = "No data available", frame = TRUE,
            symbol="box")