[R] tcltk: repeat event while button is down?
Is there a way in TCL/TK to trigger an event multiple times while a button is held down? I'd like to have an rgl scene continuously rotate until the button is released. Duncan Murdoch __ [EMAIL PROTECTED] mailing list https://www.stat.math.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html
Re: [R] tcltk: repeat event while button is down?
Duncan Murdoch [EMAIL PROTECTED] writes:
Is there a way in TCL/TK to trigger an event multiple times while a
button is held down? I'd like to have an rgl scene continuously
rotate until the button is released.
Something involving after, I'd say. Set up the rotate action to
reschedule itself after N milliseconds, and the button release event
to after cancel.
Or, perhaps safer, set a flag and condition the after command on it.
I.e. something like
doit - function() if(flag){rotate(); tkcmd(after,5,doit)}
on button press,
flag - TRUE ; doit()
and on button release
flag - FALSE
That method has the drawback that one rotate() will occur after the
button release.
The first suggestion would amount to
doit - function() {rotate(); ID - tkcmd(after,5,doit)}
and then on button press (watch the scoping issues)
ID -
doit()
and on release
tkcmd(after,cancel,ID)
which I think does work in pure Tcl, but I suspect that it in the
Windows implementation of R-Tcl can cause race conditions so that the
ID variable is outdated when the cancel takes place (Tcl guarantees
that scripts execute atomically; as it turns out, for good
reasons...).
--
O__ Peter Dalgaard Blegdamsvej 3
c/ /'_ --- Dept. of Biostatistics 2200 Cph. N
(*) \(*) -- University of Copenhagen Denmark Ph: (+45) 35327918
~~ - ([EMAIL PROTECTED]) FAX: (+45) 35327907
__
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Re: [R] tcltk: repeat event while button is down?
On 05 Aug 2004 22:55:10 +0200, Peter Dalgaard [EMAIL PROTECTED] wrote : Duncan Murdoch [EMAIL PROTECTED] writes: Is there a way in TCL/TK to trigger an event multiple times while a button is held down? I'd like to have an rgl scene continuously rotate until the button is released. Something involving after, I'd say. Set up the rotate action to reschedule itself after N milliseconds, and the button release event to after cancel. Thanks. Just one more detail: the docs I have must be old, they don't talk about separate button press and button release events. How do I attach separate event handlers to those? Duncan __ [EMAIL PROTECTED] mailing list https://www.stat.math.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html
Re: [R] tcltk: repeat event while button is down?
Duncan Murdoch [EMAIL PROTECTED] writes: On 05 Aug 2004 22:55:10 +0200, Peter Dalgaard [EMAIL PROTECTED] wrote : Duncan Murdoch [EMAIL PROTECTED] writes: Is there a way in TCL/TK to trigger an event multiple times while a button is held down? I'd like to have an rgl scene continuously rotate until the button is released. Something involving after, I'd say. Set up the rotate action to reschedule itself after N milliseconds, and the button release event to after cancel. Thanks. Just one more detail: the docs I have must be old, they don't talk about separate button press and button release events. How do I attach separate event handlers to those? ButtonPress-1 (or just 1), ButtonRelease-1, I believe. It's used in the tkcanvas demo. -- O__ Peter Dalgaard Blegdamsvej 3 c/ /'_ --- Dept. of Biostatistics 2200 Cph. N (*) \(*) -- University of Copenhagen Denmark Ph: (+45) 35327918 ~~ - ([EMAIL PROTECTED]) FAX: (+45) 35327907 __ [EMAIL PROTECTED] mailing list https://www.stat.math.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html
