Here is one approach that works on Windows (but not other platforms):
HWidentify <- function(x,y,label=seq_along(x), xlab=deparse(substitute(x)),
ylab=deparse(substitute(y)), ...) {
plot(x,y,xlab=xlab, ylab=ylab,...)
dx <- grconvertX(x,to='ndc')
dy <- grconvertY(y,to='ndc')
mm <- function(buttons, xx, yy) {
d <- (xx-dx)^2 + (yy-dy)^2
if ( all( d > .01 ) ){
plot(x,y,xlab=xlab,ylab=ylab,...)
return()
}
w <- which.min(d)
plot(x,y,xlab=xlab,ylab=ylab,...)
points(x[w],y[w], cex=2, col='red')
text(grconvertX(xx,from='ndc'),grconvertY(yy,from='ndc'),
label[w], col='green', adj=c(0,0))
return()
}
md <- function(buttons, xx, yy) {
if (any(buttons=='2')) return(1)
return()
}
getGraphicsEvent('Right Click to exit', onMouseMove = mm,
onMouseDown=md)
invisible()
}
tmpx <- runif(25)
tmpy <- rnorm(25)
HWidentify(tmpx,tmpy,LETTERS[1:25], pch=letters)
Hope this helps,
--
Gregory (Greg) L. Snow Ph.D.
Statistical Data Center
Intermountain Healthcare
greg.s...@imail.org
801.408.8111
> -----Original Message-----
> From: r-help-boun...@r-project.org [mailto:r-help-boun...@r-
> project.org] On Behalf Of Hitesh Singla
> Sent: Tuesday, August 11, 2009 10:50 PM
> To: r-help@r-project.org
> Subject: [R] How to label and unlabel points on scatterplot with mouse
> pointer
>
> Dear all,
>
> How can I label/unlabel points on scatterplot with mouse pointer. As
> the
> mouse approches near to point, it should label the closest point, then
> unlabel when it moves away.
>
> How can I do in R? I be very thankful.
>
> Thanks and Regards,
>
> Hitesh Singla
>
> --
> This message has been scanned for viruses and
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> believed to be clean.
>
> ______________________________________________
> R-help@r-project.org mailing list
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> PLEASE do read the posting guide http://www.R-project.org/posting-
> guide.html
> and provide commented, minimal, self-contained, reproducible code.
______________________________________________
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PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
and provide commented, minimal, self-contained, reproducible code.
