[Rd] Clipping (was Re: patch dendrogram.R from stats [was: Re: dendrogram plot does not draw long labels ?])
tobias.verbeke at openanalytics.eu
Sun Jan 30 21:42:32 CET 2011
On 01/29/2011 11:59 PM, Prof Brian Ripley wrote:
> On Sat, 29 Jan 2011, Martin Maechler wrote:
>>>>>>> Tobias Verbeke <tobias.verbeke at openanalytics.eu>
>>>>>>> on Tue, 25 Jan 2011 21:27:41 +0100 writes:
>> > L.S.
>> > Please find below a patch for dendrogram.R (stats package)
>> > against revision r54107 which allows one to pass the xpd
>> > parameter as a component of the nodePar list (to be
>> > passed to plot.dendrogram).
>> > I hope I did not overlook anything.
>> Thank you, Tobias.
>> Note BTW, that on Linux I don't have your problems that the
>> label is "not drawn" when it does not fit.
>> For me, it just is clipped (to the figure region as you note),
>> so "chopped off" but the part inside the figure box is well
>> I was searching a bit and did not find mentioned on ?par or
>> ?clip that clipping happens device dependently,
>> but I vaguely recall to have seen it stated..
> Yes, it is device-dependent (but then most low-level things about
> graphics are, in particular everything about fonts).
> The designers of the graphics internals never documented their
> principles, but I retrospectively tried to do so in the R-ints manual.
> So whereas clipping of lines is done in the graphics engine, for text
> the manual says:
> If possible, the graphics device should handle clipping of text. It
> indicates this by the structure element 'canClip' which if true will
> result in calls to the callback 'clip' to set the clipping region. If
> this is not done, the engine will clip very crudely (by omitting any
> text that does not appear to be wholly inside the clipping region).
> I'll add a note to ?clip, but perhaps this can serve as a reminder that
> the R-ints manual is the place to look for low-level graphics details.
Many thanks, Prof Ripley and Martin, for your work
integrating the patch, documentation updates as well
as for the additional explanation putting the observed
behaviour in perspective.
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