[R] clicking on plot and recording XY coords

From: milton ruser <milton.ruser_at_gmail.com>
Date: Sat, 21 Jun 2008 00:25:25 -0300


Dear all,

I need to run a interactive procedure where the user will need click on the screen (over a XY plot) and I need to record the XY coordinate which the user clicked. Roughly I wrote a short code below. You see that I suppose that the user will choose four coordinates inside the region of intersection between three segmentes. On each click, I would like to record the position clicked in a vector. Any help are welcome.

Miltinho



number.clicks<-4
for (i in 1:number.clicks)
 {
 plot(0,0, type="n")
 seg1<-arrows(-0.5,-1,0.5,0, col=1)
 seg2<-arrows(0,-1,-0.3,0.3, col=2)
 seg3<-arrows(0.2,-0.7,-0.5,0, col=4)

# here I would like click on PLOT
# and record de XY position
# before go to next aquisition

 }

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