Hi, Greg,
Thanks again for your reply. I looked at TkIdentify which lead me to
"plt", which with RSiteSearch("grid plt") lead me to gridBase::gridPLT.
Here's my solution:
stopifnot(require(tkrplot),
require(lattice),
require(gridBase))
makePlot <- function() {
print(xyplot(1 ~ 1))
if(click) {
trellis.focus(highlight = FALSE)
plt <- gridPLT()
out <- ((x < plt[1] || x > plt[2]) ||
(y < plt[3] || y > plt[4]))
cat(if(out) "outside" else "inside", "\n")
}
}
clickPlot <- function(x, y) {
width <- as.numeric(tclvalue(tkwinfo("reqwidth", img)))
height <- as.numeric(tclvalue(tkwinfo("reqheight", img)))
x <<- as.numeric(x)/width
y <<- 1 - as.numeric(y)/height
click <<- TRUE
tkrreplot(img)
click <<- FALSE
}
x <- y <- -1
click <- FALSE
tt <- tktoplevel()
img <- tkrplot(tt, makePlot)
tkbind(img, "<1>", clickPlot)
tkpack(img)
tkwm.resizable(tt, 0, 0)
Greg Snow said the following on 11/7/2008 8:23 PM:
As far as R is concerned, the plot in tkrplot is being written to a file and
therefore is not interactive. So functions like grid.locator and trellis.focus
are not going to work.
You need to use the Tk commands to determine where the mouse is and where a
click occurred, then this needs to be converted to the coordinates of the
trellis plot. There are some examples of the first part in the TeachingDemos
package, eg TkBrush, TkIdentify, TkApprox, and a couple of others (also the
play.sudoku function in the Sudoku package). These all work with base graphics
rather than trellis/grid so will not help with the 2nd part. Possibly
something in the grid package can tell you the coordinates of the various
viewports (but you need to save this information before the end of the plotting
command because the information will probably be lost when the plot finishes).
Hope this helps,
--
Gregory (Greg) L. Snow Ph.D.
Statistical Data Center
Intermountain Healthcare
[EMAIL PROTECTED]
801.408.8111
-----Original Message-----
From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]
project.org] On Behalf Of Sundar Dorai-Raj
Sent: Friday, November 07, 2008 12:43 PM
To: r-help@r-project.org
Subject: [R] determining plot location in lattice
Hi,
I'm dealing with a lattice plot inserted into a tk widget and would
like
to know when a user has clicked on the plot area of a plot (i.e. inside
the axes). For example,
library(tkrplot)
library(lattice)
tt <- tktoplevel()
makePlot <- function() print(xyplot(1 ~ 1))
printCoords <- function(x, y) print(c(x, y))
img <- tkrplot(tt, makePlot)
tkbind(img, "<1>", printCoords)
tkpack(img)
I would like to know when a user clicks inside the axes, but don't know
how to determine where the plot region is. Essentially, this comes down
to answering the following question: Assuming the entire plot is on a
unit square, what are the coordinates of the plotting area?
This question is may seem unrelated to tkrplot, but outside of this
context I may not get answers that work. I have been playing with both
lattice::trellis.focus and grid::grid.locator to no avail.
Thanks,
--sundar
______________________________________________
R-help@r-project.org 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@r-project.org 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.
