Check out the engauge digitizer: http://digitizer.sourceforge.net/
On 6/15/07, Ted Harding <[EMAIL PROTECTED]> wrote: > Hi Folks, > > This is off-topic R-wise, but it may be close to > the heart of many R-users, so I think it may be > the best place to ask! > > Users of 'gv' (the "front end" to ghostscript) will > be aware of the little window which gives you the > x-y coordinates (in points = 1/72 inch) of the position > of the "cross-hair" mouse cursor. These coordinates > are those of the corresponding position on the printed > page, relative to some origin. > > I have often used this to extract numerical values > for data from graphs in Postscript files (also PDF > files, after you have converted them to PS). Then > (veering back on topic ... ) you can submit the > numerical data to R and try your own analyses on > these data, and compare with what the article does. > > However, this little window only gives the numbers > in whole points. Say a smallish graphic may print > out 3 inches wide or high. Then you get precision > of 1/216 per 3 inches or 0.4% of full scale. This > can be adequate on many occasions, but can be on > the coarse side on other occasions. > > Even for a 6-inch-wide/high graph, you only get down > to 0.2% of full scale. > > If it were possible to induce 'gv' to display these > coordinates in tenths of a point, then much greater > precision (as adequate as one can expect to hope for > when, in effect, "measuring off the graph") could be > obtained. > > Does anyone know: > a) Whether it is possible to persuade 'gv' to give > this display in fractional points (my own search > of the documentation has not revealed anything); > b) Of any alternative to 'gv' as PS viewer which would > provide this capability? > > With thanks, and best wishes to all, > Ted. > > -------------------------------------------------------------------- > E-Mail: (Ted Harding) <[EMAIL PROTECTED]> > Fax-to-email: +44 (0)870 094 0861 > Date: 15-Jun-07 Time: 16:13:21 > ------------------------------ XFMail ------------------------------ > > ______________________________________________ > R-help@stat.math.ethz.ch mailing list > https://stat.ethz.ch/mailman/listinfo/r-help > PLEASE do read the posting guide http://www.R-project.org/posting-guide.html > and provide commented, minimal, self-contained, reproducible code. > ______________________________________________ R-help@stat.math.ethz.ch mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.