gradLinkTypoLayer {cartography}

Graduated and Colored Links Layer

Description

Plot a layer of colored and graduated links. Links are plotted according to discrete classes of widths. Colors depend on a discrete variable of categories.

Usage

gradLinkTypoLayer(
  x,
  df,
  xid = NULL,
  dfid = NULL,
  var,
  breaks = getBreaks(v = df[, var], nclass = 4, method = "quantile"),
  lwd = c(1, 2, 4, 6),
  var2,
  col = NULL,
  colNA = "white",
  legend.title.cex = 0.8,
  legend.values.cex = 0.6,
  legend.values.rnd = 0,
  legend.var.pos = "bottomleft",
  legend.var.title.txt = var,
  legend.var.frame = FALSE,
  legend.var2.pos = "topright",
  legend.var2.title.txt = var2,
  legend.var2.values.order = NULL,
  legend.var2.nodata = "no data",
  legend.var2.frame = FALSE,
  add = TRUE
)

Arguments

x

an sf object, a simple feature collection.

df

a data frame that contains identifiers of starting and ending points and variables.

xid

names of the identifier variables in x, character vector of length 2, default to the 2 first columns. (optional)

dfid

names of the identifier variables in df, character vector of length 2, default to the two first columns. (optional)

var

name of the variable used to plot the links widths.

breaks

break values in sorted order to indicate the intervals for assigning the lines widths.

lwd

vector of widths (classes of widths).

var2

name of the variable used to plot the links colors.

col

color of the links.

colNA

no data color.

legend.title.cex

size of the legend title.

legend.values.cex

size of the values in the legend.

legend.values.rnd

number of decimal places of the values in the legend.

legend.var.pos

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

legend.var.title.txt

title of the legend (numeric data).

legend.var.frame

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

legend.var2.pos

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

legend.var2.title.txt

title of the legend (factor data).

legend.var2.values.order

values order in the legend, a character vector that matches var modalities. Colors will be affected following this order.

legend.var2.nodata

text for "no data" values

legend.var2.frame

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

add

whether to add the layer to an existing plot (TRUE) or not (FALSE).

Note

Unlike most of cartography functions, identifiers variables are mandatory.

See Also

getLinkLayer, propLinkLayer, legendGradLines, gradLinkLayer

Examples

library(sf)
mtq <- st_read(system.file("gpkg/mtq.gpkg", package="cartography"))
mob <- read.csv(system.file("csv/mob.csv", package="cartography"))
# Create a link layer - work mobilities to Fort-de-France (97209) and 
# Le Lamentin (97213)
mob.sf <- getLinkLayer(x = mtq, df = mob[mob$j %in% c(97209, 97213),], 
                       dfid = c("i", "j"))
# Plot the links - Work mobility
plot(st_geometry(mtq), col = "grey60",border = "grey20")
gradLinkTypoLayer(x = mob.sf, df = mob,
                  var = "fij", 
                  breaks = c(109,500,1000,2000,4679), 
                  lwd = c(1,2,4,10),
                  var2='j', add = TRUE)