cartography (version 2.1.0)

gradLinkLayer: Graduated Links Layer

Description

Plot a layer of graduated links. Links are plotted according to discrete classes of widths.

Usage

gradLinkLayer(x, df, xid = NULL, dfid = NULL, var, breaks = getBreaks(v =
  df[, var], nclass = 4, method = "quantile"), lwd = c(1, 2, 4, 6),
  col = "red", legend.pos = "bottomleft", legend.title.txt = var,
  legend.title.cex = 0.8, legend.values.cex = 0.6, legend.values.rnd = 0,
  legend.frame = FALSE, add = TRUE, spdf, spdfid, spdfids, spdfide, dfids,
  dfide)

Arguments

x

an sf object, a simple feature collection.

df

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

xid

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

dfid

identifier fields 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).

col

color of the links.

legend.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)). If legend.pos is "n" then the legend is not plotted.

legend.title.txt

title of the legend.

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 displayed in the legend.

legend.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).

spdf

defunct.

spdfid

defunct.

spdfids

defunct.

spdfide

defunct.

dfids

defunct.

dfide

defunct.

See Also

getLinkLayer, propLinkLayer, legendGradLines

Examples

# NOT RUN {
library(sp)
data("nuts2006")
# Create a link layer
twincities.sf <- getLinkLayer(x = nuts2.spdf, df = twincities.df[,1:2])
# Plot the links - Twin cities agreements between regions 
plot(nuts0.spdf, col = "grey60",border = "grey20")
gradLinkLayer(x = twincities.sf, df = twincities.df,
              legend.pos = "topright",
              var = "fij", breaks = c(2,5,15,20,30), lwd = c(0.1,1,4,10),
              col = "#92000090", add = TRUE)
# }