See getcell at: http://finzi.psych.upenn.edu/R/Rhelp02a/archive/63579.html
which converts between absolute and user coordinates. It should give you insight to allow you to develop this functionality. On 11/11/05, ivo welch <[EMAIL PROTECTED]> wrote: > > dear R wizards: could you please point me into the right direction? I > would like to write a general function arrow(x1,y1,x2,y2), which > naturally draws an arrow. > > the basics of writing this function are of course easy. the only > complication is that I would like the arrow not to exactly hit (x2,y2), > but to stop short just a "tiny bit." alas, because I want my arrow() > function to be general, I would rather not have to tell it the xlim and > ylim plot parameters. So, I need something more akin to the absolute > positioning by which the argument "pos" works within the text() > function. In fact, optimally, I would adopt the default distance that > the "pos=x" uses, and have an optional parameter that allows the user to > change this. > > could someone please point me to an example of how to do something like > this? > > regards, > > /iaw > > ______________________________________________ > [email protected] mailing list > https://stat.ethz.ch/mailman/listinfo/r-help > PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html > ______________________________________________ [email protected] mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html
