spdep (version 0.1-13)

plotpolys: Plot polygons

Description

A helper function for plotting polygons in a global bounding box. findInterval2 is a modified version of findInterval2 that permits the vector of break points to start at -Inf and/or finish at Inf. leglabs makes character strings from the same break points.

Usage

plotpolys(pl, bb, col = NA, border = par("fg"), add = FALSE, xlim, ylim, ...)
leglabs(vec, under="under", over="over", between="-")
findInterval2(x, vec, rightmost.closed = FALSE, all.inside = TRUE)

Arguments

pl

list of polygons of class polylist

bb

matrix of polygon bounding boxes - columns are LL(x), LL(y), UR(x), UR(y)

col

colurs to use for filling the polygons

border

the color to draw the border

add

add to existing plot

xlim, ylim

numeric of length 2, giving the x and y coordinates ranges

...

other arguments passed to polygon

vec

vector of break values

under

character value for under

over

character value for over

between

character value for between

x

numeric vector to be broken into class intervals

rightmost.closed

as in findInterval()

all.inside

as in findInterval()

See Also

Map2poly, findInterval

Examples

data(columbus)
brks <- round(quantile(columbus$CRIME, probs=seq(0,1,0.2)), digits=2)
colours <- c("salmon1", "salmon2", "red3", "brown", "black")
plotpolys(polys, bbs, col=colours[findInterval2(columbus$CRIME, brks)])
legend(x=c(5.8, 7.1), y=c(13, 14.5), legend=leglabs(brks),
  fill=colours, bty="n")
title(main=paste("Columbus OH: residential burglaries and vehicle
thefts",
  "per thousand households, 1980"))