thigmophobe.labels

0th

Percentile

Place labels away from the nearest point

thigmophobe.labels places labels adjacent to each point, offsetting each label in the direction returned by thigmophobe.

Keywords
misc
Usage
thigmophobe.labels(x,y,labels=NULL,text.pos=NULL,...)
Arguments
x,y
Numeric data vectors or a list with two components. Typically the x/y coordinates of plotted points.
labels
A vector of strings that will be placed adjacent to each point. Defaults to the indices of the coordinates.
text.pos
An optional vector of text positions (see text).
...
additional arguments are passed to text
Details

Typically used to automatically place labels on a scatterplot or similar to avoid overlapping labels. thigmophobe.labels will sometimes place a label off the plot or fail to separate labels in clusters of points. The user can manually adjust the errant labels by running thigmophobe first and saving the returned vector. Then modify the position values to place the labels properly and pass the edited vector to thigmophobe.labels as the text.pos argument. This takes precedence over the positions calculated by thigmophobe. Both pointLabel in the maptools package and spread.labs in the TeachingDemos package use more sophisticated algorithms to place the labels and are worth a try if thigmophobe just won't get it right.

Value

  • A vector of directions away from the point nearest to each point.

See Also

thigmophobe, text

Aliases
  • thigmophobe.labels
Examples
x<-rnorm(20)
 y<-rnorm(20)
 xlim<-range(x)
 xspace<-(xlim[2]-xlim[1])/20
 xlim<-c(xlim[1]-xspace,xlim[2]+xspace)
 ylim<-range(y)
 yspace<-(ylim[2]-ylim[1])/20
 ylim<-c(ylim[1]-yspace,ylim[2]+yspace)
 plotlabels<-
  c("one","two","three","four","five","six","seven","eight","nine","ten",
  "eleven","twelve","thirteen","fourteen","fifteen","sixteen","seventeen",
  "eighteen","nineteen","twenty")
 plot(x=x,y=y,xlim=xlim,ylim=ylim,main="Test thigmophobe.labels")
 # skip the almost invisible yellow label, make them bold and without borders
 thigmophobe.labels(x,y,plotlabels,col=c(2:6,8:12),border=NA,font=2)
Documentation reproduced from package plotrix, version 2.7-2, License: GPL (>= 2)

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