Hi experts,
I was graciously offered a function to enhance abline by restricting the
extent of the line to less than the plotting region. This seems a useful
idea, and it looked like the easiest way to program it was to set up a
clipping region with "clip", draw the abline and then restore the
previous clipping region. Let us call this function ablineclip. After
quite a bit of testing, I have found that the first call to ablineclip
ignores the clipping region. It's not that simple. Successive calls to
ablineclip respect the clipping region, even if it changes. I can
reproduce the behavior like this:
plot(-3:3,-3:3)
clip(-2,2,-2,2)
abline(v=0)
clip(-2,2,-2,2)
abline(h=0)
The first abline ignores the clip, the second respects it. I have
programmed around this, with the pathetic kludge of calling "abline"
with a line outside the plotting area, calling "clip" a second time, and
then calling "abline" with the line that was requested. While this
works, my place in programming history will be ineradicably compromised
if the Programmers' Hall of Fame ever finds out. Any suggestions?
R-2.7.2
FC9 Linux
Jim
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