[R] Text position in Traditional Graphics
R 2.4.1 on Windows XP. Question: In traditional graphics, is it possible to find out the height of a line of text in units that can be used in arithmetic and then in calls to text()? Context: I have written a function that draws a plot and then, depending on whether some arguments are TRUE or FALSE, draws various lines of text in the plot. The text lines may be turned on or off individually by the user. The function uses plot() and several calls to text(). However, I have not found a good way to adjust the Y coordinate of the text for lines after the first. I would like this to work when the graphics device (windows) is opened at (or resized to) a wide range of sizes. The issue is that a line of text takes up a smaller fraction of the total Y span of the plotting region as the window gets larger. It seems this can be done with grid graphics, but although I plan to learn grid, I am hoping that for now, I can do this work with traditional graphics. Thanks! -- Mike Prager, NOAA, Beaufort, NC * Opinions expressed are personal and not represented otherwise. * Any use of tradenames does not constitute a NOAA endorsement. __ 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.
Re: [R] Text position in Traditional Graphics
A few days a go Jim Holman [EMAIL PROTECTED] suggested this (Re: [R] How to annotate a graph with non-transparent math labels?) for a similar circumstance. Perhaps it will for in your case. try using strwidth strheight x-c(0,1) plot(x,x,type='l') dimensions-matrix(c(strwidth(expression(theta),cex=5),strheight(expression( theta), cex=5)),nrow=1) symbols(0.5,0.5 ,rectangle=dimensions,bg='white',fg='white',add=TRUE,inches=FALSE) text(0.5,0.5,expression(theta),cex=5) ~ Charles Annis, P.E. [EMAIL PROTECTED] phone: 561-352-9699 eFax: 614-455-3265 http://www.StatisticalEngineering.com -Original Message- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Mike Prager Sent: Wednesday, January 24, 2007 4:30 PM To: r-help@stat.math.ethz.ch Subject: [R] Text position in Traditional Graphics R 2.4.1 on Windows XP. Question: In traditional graphics, is it possible to find out the height of a line of text in units that can be used in arithmetic and then in calls to text()? Context: I have written a function that draws a plot and then, depending on whether some arguments are TRUE or FALSE, draws various lines of text in the plot. The text lines may be turned on or off individually by the user. The function uses plot() and several calls to text(). However, I have not found a good way to adjust the Y coordinate of the text for lines after the first. I would like this to work when the graphics device (windows) is opened at (or resized to) a wide range of sizes. The issue is that a line of text takes up a smaller fraction of the total Y span of the plotting region as the window gets larger. It seems this can be done with grid graphics, but although I plan to learn grid, I am hoping that for now, I can do this work with traditional graphics. Thanks! -- Mike Prager, NOAA, Beaufort, NC * Opinions expressed are personal and not represented otherwise. * Any use of tradenames does not constitute a NOAA endorsement. __ 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.
Re: [R] Text position in Traditional Graphics
On Wed, 2007-01-24 at 16:30 -0500, Mike Prager wrote: R 2.4.1 on Windows XP. Question: In traditional graphics, is it possible to find out the height of a line of text in units that can be used in arithmetic and then in calls to text()? Context: I have written a function that draws a plot and then, depending on whether some arguments are TRUE or FALSE, draws various lines of text in the plot. The text lines may be turned on or off individually by the user. The function uses plot() and several calls to text(). However, I have not found a good way to adjust the Y coordinate of the text for lines after the first. I would like this to work when the graphics device (windows) is opened at (or resized to) a wide range of sizes. The issue is that a line of text takes up a smaller fraction of the total Y span of the plotting region as the window gets larger. It seems this can be done with grid graphics, but although I plan to learn grid, I am hoping that for now, I can do this work with traditional graphics. Thanks! Mike, you might want to take a look at: ?strheight The one thing to be potentially aware of, is if the plot window is resized, some aspects of drawing text can be subject to alteration. It may take some trial and error to determine how the method you wish to use may be prone to such problems. For example: plot(1, type = n) text(1, 1, This is a test) text(1, 1 + strheight(T), This is a test) text(1, 1 + strheight(T) * 2, This is a test) text(1, 1 + strheight(T) * 3, This is a test) Now, drag and resize the plot window here Then run: text(1, 1 + strheight(T) * 4, This is a test) This may behave differently on Windows, but on Linux, when I resize the X window, the last line of text (* 4) is placed between (* 2) and (* 3). HTH, Marc Schwartz __ 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.
Re: [R] Text position in Traditional Graphics
Mike Prager [EMAIL PROTECTED] wrote: R 2.4.1 on Windows XP. Question: In traditional graphics, is it possible to find out the height of a line of text in units that can be used in arithmetic and then in calls to text()? [...] I seem to have solved my own question by setting the user scale to the size of the window in inches, converting the point size into inches, and going from there. This works well for all sizes of windows. It doesn't change the spacing when windows are resized, but I can live with that. There is nothing like posting to R-help to stimulate one's own thoughts. -- Mike Prager, NOAA, Beaufort, NC * Opinions expressed are personal and not represented otherwise. * Any use of tradenames does not constitute a NOAA endorsement. __ 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.
Re: [R] Text position in Traditional Graphics
If you are going to take this approach, you may want to look at the cnvrt.coords function in the TeachingDemos package. That may save you a few calculations. -- Gregory (Greg) L. Snow Ph.D. Statistical Data Center Intermountain Healthcare [EMAIL PROTECTED] (801) 408-8111 -Original Message- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Mike Prager Sent: Wednesday, January 24, 2007 3:01 PM To: r-help@stat.math.ethz.ch Subject: Re: [R] Text position in Traditional Graphics Mike Prager [EMAIL PROTECTED] wrote: R 2.4.1 on Windows XP. Question: In traditional graphics, is it possible to find out the height of a line of text in units that can be used in arithmetic and then in calls to text()? [...] I seem to have solved my own question by setting the user scale to the size of the window in inches, converting the point size into inches, and going from there. This works well for all sizes of windows. It doesn't change the spacing when windows are resized, but I can live with that. There is nothing like posting to R-help to stimulate one's own thoughts. -- Mike Prager, NOAA, Beaufort, NC * Opinions expressed are personal and not represented otherwise. * Any use of tradenames does not constitute a NOAA endorsement. __ 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.
