This repository contains functions and methods for label placement with spplot and lattice:
- Point labels:
panel.pointLabel
,sp.pointLabel
. - Line labels:
lineLabel
,sp.lineLabel
,label
.
They have been included in the maptools
package, which is to be archived.
Read the help files contained in the man folder for details.
library(lattice)
library(RColorBrewer)
library(sp)
source("R/pointLabel.R")
n <- 15
x <- rnorm(n)*10
y <- rnorm(n)*10
labels <- as.character(round(x, 5))
myTheme <- list(add.text=list(
cex=0.7,
col='midnightblue',
fontface=2,
fontfamily='mono'))
library(lattice)
xyplot(y~x,
labels=labels,
par.settings=myTheme,
panel=function(x, y, labels, ...){
panel.xyplot(x, y, ...)
panel.pointLabel(x, y, labels=labels, ...)
})
data(meuse.grid)
coordinates(meuse.grid) = ~x+y
proj4string(meuse.grid) <- CRS("+init=epsg:28992")
gridded(meuse.grid) = TRUE
pts <- spsample(meuse.grid, n=15, type="random")
Rauthors <- readLines(file.path(R.home("doc"), "AUTHORS"))[9:28]
someAuthors <- Rauthors[seq_along(pts)]
sl1 <- list('sp.points', pts, pch=19, cex=.8, col='midnightblue')
sl2 <- list('sp.pointLabel', pts, label=someAuthors,
cex=0.7, col='midnightblue',
fontfamily='Palatino')
myCols <- adjustcolor(colorRampPalette(brewer.pal(n=9, 'Reds'))(100), .85)
spplot(meuse.grid["dist"], col.regions=myCols, sp.layout=list(sl1, sl2))
library(lattice)
library(RColorBrewer)
library(sp)
source("R/lineLabel.R")
data(meuse.grid)
coordinates(meuse.grid) = ~x+y
proj4string(meuse.grid) <- CRS("+init=epsg:28992")
gridded(meuse.grid) = TRUE
data(meuse)
coordinates(meuse) = ~x+y
data(meuse.riv)
meuse.sl <- SpatialLines(list(Lines(list(Line(meuse.riv)), "1")))
myCols <- adjustcolor(colorRampPalette(brewer.pal(n=9, 'Reds'))(100), .85)
labs <- label(meuse.sl, 'Meuse River')
## Maximum depth
sl1 <- list('sp.lineLabel', meuse.sl, label=labs,
position='below', textloc='maxDepth',
spar=.2,
col='darkblue', cex=1,
fontfamily='Palatino',
fontface=2)
spplot(meuse.grid["dist"],
col.regions=myCols,
sp.layout = sl1)
## Constant slope
sl2 <- modifyList(sl1, list(textloc = 'constantSlope')) ## Default
spplot(meuse.grid["dist"],
col.regions=myCols,
sp.layout = sl2)
## Location defined by its numeric index
sl3 <- modifyList(sl1, list(textloc = 140, position='above'))
spplot(meuse.grid["dist"],
col.regions=myCols,
sp.layout = sl3)