On Thu, 21 May 1998, Bill Simpson wrote:
> I have a bunch of curves on a plot and I would like to label each curve.
> Currently, if I place the text right on the curve it is hard to read
> because the text and the curve overlap. I would like to make a label
> on an opaque white box just slightly larger than the label, and this sits
> on top of the curve. (This is easy to do in drawing programs on the Mac)
>
> If I have the label ||
> and the line ----------------
> I want the result to look like
> ----||-----
> not like
> ----H------
>
I would have expected legend() to be able to do this, but it can't -- if
a box is not drawn the background is not shaded. However you can do it
manually:
Suppose s<-"||" is your text, and lx,ly are the coordinates where
you want
it.
hh<-strheight(s)/2
ww<-strwidth(s)/2
rect(lx-ww,ly-hh,lx+ww,ly+hh,border=par("bg"),col=par("bg"))
text(lx,ly,labels=s)
This draws a rectangle big enough for the text in the current background
color and then writes the text. You can adjust how much space there is
by changing the 2 to something smaller
Thomas Lumley
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