[R] editing ".Internal" functions
Prof Brian Ripley
ripley at stats.ox.ac.uk
Wed Aug 23 19:21:09 CEST 2006
On Wed, 23 Aug 2006, B. Chasco wrote:
> There is a function called arrows() which is an .Internal function. How
> difficult is it to modify that function to return the xy coordinates for
> the line "segments" that make up the arrowhead?
That depends on your 'core competencies'. You have the source, which is
in file src/main/plot.c (and GArrow in src/main/graphics.c). I am not
sure I understand your question, as arrows() is plural and draws multiple
arrows with 0/1/2 heads each. Also, the 'xy coordinates' are to be in
which coordinate system, and you do realize that the sizes in user
coordinates change if you resize the plot?
--
Brian D. Ripley, ripley at stats.ox.ac.uk
Professor of Applied Statistics, http://www.stats.ox.ac.uk/~ripley/
University of Oxford, Tel: +44 1865 272861 (self)
1 South Parks Road, +44 1865 272866 (PA)
Oxford OX1 3TG, UK Fax: +44 1865 272595
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