Simple Point-and-Click Interface Panels
These functions enable the user to create a simple, robust, point-and-click interface to any R code.
simplepanel(title, B, boxes, clicks,
redraws=NULL, exit = NULL, env)
grow.simplepanel(P, side = c("right", "left", "top", "bottom"),
len = NULL, new.clicks, new.redraws=NULL, ..., aspect)title |
Character string giving the title of the interface panel. |
B |
Bounding box of the panel coordinates.
A rectangular window (object of class |
boxes |
A list of rectangular windows (objects of class |
clicks |
A list of R functions, of the same length as |
redraws |
Optional list of R functions, of the same length as |
exit |
An R function specifying actions to be taken when the interactive panel terminates. |
env |
An |
P |
An existing interaction panel (object of class |
side |
Character string identifying which side of the panel |
len |
Optional. Thickness of the new panel area that should be grown
to accommodate the new buttons. A single number in the same units
as the coordinate system of |
new.clicks |
List of R functions defining the operations to be performed when each of the new buttons is clicked. |
new.redraws |
Optional. List of R functions, of the same length as
|
... |
Arguments passed to |
aspect |
Optional. Aspect ratio (height/width) of the new buttons. |
These functions enable the user to create a simple, robust, point-and-click interface to any R code.
The functions simplepanel and grow.simplepanel
create an object of class "simplepanel". Such an object defines
the graphics to be displayed and the actions to be performed
when the user interacts with the panel.
The panel is activated by calling run.simplepanel.
The function simplepanel creates a panel object
from basic data.
The function grow.simplepanel modifies an existing
panel object P by growing an additional row or column
of buttons.
For simplepanel,
The spatial layout of the panel is determined by the rectangles
B and boxes.
The argument clicks must be a list of functions
specifying the action to be taken when each button is clicked
(or NULL to indicate that no action should be taken).
The list entries should have names (but there are sensible defaults).
Each function should be of the form function(env, xy) where
env is an environment that may contain shared data,
and xy gives the coordinates of the mouse click, in the format
list(x, y).
The function returns TRUE if the
panel should continue running, and FALSE if the panel
should terminate.
The argument redraws, if given, must be a list of functions
specifying the action to be taken when each button is to be redrawn.
Each function should be of the form function(button, name, env) where
button is a rectangle specifying the location of the button
in the current coordinate system; name is a character string
giving the name of the button; and env is the
environment that may contain shared data.
The function returns TRUE if the
panel should continue running, and FALSE if the panel
should terminate.
If redraws is not given (or if one of the entries in
redraws is NULL), the default action is to draw a pink
rectangle showing the button position,
draw the name of the button in the middle of this rectangle,
and return TRUE.
The argument exit, if given, must be a function
specifying the action to be taken when the panel terminates.
(Termination occurs when one of the clicks functions
returns FALSE).
The exit function should be of the form function(env) where
env is the environment that may contain shared data.
Its return value will be used as the return value
of run.simplepanel.
The argument env should be an R environment.
The panel buttons will have access to this environment,
and will be able to read and write data in it. This mechanism is used
to exchange data between the panel and other R code.
For grow.simplepanel,
the spatial layout of the new boxes
is determined by the arguments side, len,
aspect and by the additional ... arguments passed to
layout.boxes.
the argument new.clicks
should have the same format as clicks.
It implicitly specifies the number of new buttons to be added,
and the actions to be performed when they are clicked.
the optional argument new.redraws, if given,
should have the same format as redraws.
It specifies the actions to be performed when the
new buttons are clicked.
An object of class "simplepanel".
Adrian Baddeley Adrian.Baddeley@curtin.edu.au, Rolf Turner r.turner@auckland.ac.nz and Ege Rubak rubak@math.aau.dk.
# make boxes (alternatively use layout.boxes())
Bminus <- square(1)
Bvalue <- shift(Bminus, c(1.2, 0))
Bplus <- shift(Bvalue, c(1.2, 0))
Bdone <- shift(Bplus, c(1.2, 0))
myboxes <- list(Bminus, Bvalue, Bplus, Bdone)
myB <- do.call(boundingbox,myboxes)
# make environment containing an integer count
myenv <- new.env()
assign("answer", 0, envir=myenv)
# what to do when finished: return the count.
myexit <- function(e) { return(get("answer", envir=e)) }
# button clicks
# decrement the count
Cminus <- function(e, xy) {
ans <- get("answer", envir=e)
assign("answer", ans - 1, envir=e)
return(TRUE)
}
# display the count (clicking does nothing)
Cvalue <- function(...) { TRUE }
# increment the count
Cplus <- function(e, xy) {
ans <- get("answer", envir=e)
assign("answer", ans + 1, envir=e)
return(TRUE)
}
# 'Clear' button
Cclear <- function(e, xy) {
assign("answer", 0, envir=e)
return(TRUE)
}
# quit button
Cdone <- function(e, xy) { return(FALSE) }
myclicks <- list("-"=Cminus,
value=Cvalue,
"+"=Cplus,
done=Cdone)
# redraw the button that displays the current value of the count
Rvalue <- function(button, nam, e) {
plot(button, add=TRUE)
ans <- get("answer", envir=e)
text(centroid.owin(button), labels=ans)
return(TRUE)
}
# make the panel
P <- simplepanel("Counter",
B=myB, boxes=myboxes,
clicks=myclicks,
redraws = list(NULL, Rvalue, NULL, NULL),
exit=myexit, env=myenv)
# print it
P
# show what it looks like
redraw.simplepanel(P)
# ( type run.simplepanel(P) to run the panel interactively )
# add another button to right
Pplus <- grow.simplepanel(P, "right", new.clicks=list(clear=Cclear))Please choose more modern alternatives, such as Google Chrome or Mozilla Firefox.