[Rd] arrows()/log scale/clipping (?) (PR#1039)

[Paul Murrell]

Hi


> >    arrows() seems to hang when either x or y scale of the plot
> > is logarithmic and the arrows requested go beyond the plot
> > (by more than a certain amount).  I didn't go into C code to
> > find it, but here's a function that exercises the bug a bit ...
> >
> > arrow.bug2 <- function(y0=1,y1=10,log="y") {
> >   plot(c(0.1,1),c(1,10),log=log)
> >   arrows(x0=0.5,
> >          y0=y0,
> >          x1=0.5,
> >          y1=y1,
> >          length=0.05,angle=90)
> > }
> >
> > arrow.bug2() ## OK
> > arrow.bug2(log="x") ## OK
> > arrow.bug2(y0=0.01)  ##hangs
> > arrow.bug2(y1=11)  ## OK
> > arrow.bug2(y1=20)  ## hangs
> > arrow.bug2(log="x",y1=20) ## hangs
>
> This is gone in the development version. Didn't we have a very similar
> report quite recently??


Yes.  There was a bug in the line-clipping code (which I presume is what
this code is tickling), which has been fixed for 1.3.1

Paul


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