boxed.labels: Place labels in boxes

In plotrix: Various Plotting Functions

Place labels in boxes

Description

Places labels in boxes on an existing plot

Usage

 boxed.labels(x,y=NULL,labels,
  bg=ifelse(match(par("bg"),"transparent",0),"white",par("bg")),
  border=TRUE,xpad=1.2,ypad=1.2,srt=0,cex=1,adj=0.5,xlog=FALSE,ylog=FALSE,...)

Arguments

x,y	x and y position of the centers of the labels. ‘⁠x⁠’ can be an xy.coords list.
bg	The fill color of the rectangles on which the labels are displayed (see Details).
labels	Text strings
border	Whether to draw borders around the rectangles.
xpad,ypad	The proportion of the rectangles to the extent of the text within.
srt	Rotation of the labels. If 90 or 270 degrees, the box will be rotated 90 degrees.
cex	Character expansion. See ‘⁠text⁠’.
adj	left/right adjustment. If this is set outside the function, the box will not be aligned properly.
xlog	Whether the X axis is a log axis
ylog	Whether the Y axis is a log axis
...	additional arguments passed to ‘⁠text⁠’.

Details

The label(s) are displayed on a rectangular background. This may be useful for visibility and is the reason that "transparent" background is not available. With the default ‘⁠textcol=NA⁠’, the function tries to work out whether white or black text will be more easily read based on the background color and displays the text accordingly. If the user specifies text colors in the additional arguments, these colors will override the automatic white/black above - see the last example.

Only right angle rotations are allowed in ‘⁠boxed.labels⁠’. Important change: ‘⁠xpad⁠’ and ‘⁠ypad⁠’ are now the full proportion of the box to text, not half. The user can now call ‘⁠cylindrect⁠’ or ‘⁠gradient.rect⁠’ for the background rectangle.

Value

nil

Note

This function is best for regularly spaced labels where overlapping is not a problem. See thigmophobe.labels for placing labels where overlap is likely.

Author(s)

Jim Lemon - thanks to Thorn Thaler for the code allowing user-specified text colors and Flemming Skjoth for the log axis correction

See Also

spread.labels, thigmophobe.labels

Examples

 x<-rnorm(10)
 y<-rnorm(10)
 plot(x,y,type="p")
 nums<-c("one","two","three","four","five","six","seven","eight","nine","ten")
 boxed.labels(x,y-0.1,nums)
 # now label a barplot
 xpos<-barp(c(1,3,2,4))
 boxed.labels(xpos$x,0.5,nums[1:4])
 # and add labels below the x axis ticks
 boxed.labels(xpos$x,-0.4,c("First","Second","Third","Fourth"))
 # perform a PCA on the "swiss" dataset and plot the first two components
 data(swiss)
 swiss.pca<-prcomp(swiss)
 plot(swiss.pca$rotation[,1:2],xlim=c(-1,0.2),main="PCA of swiss dataset",
  type="n")
 boxed.labels(swiss.pca$rotation[1:6],swiss.pca$rotation[7:12],ypad=1.5,
  colnames(swiss),bg=c("red","purple","blue","blue","darkgreen","red"),
  col="yellow")

plotrix documentation built on Nov. 10, 2023, 5:07 p.m.