Thanks Greg. I guess another option is to call a C function directly. On Windows I see there is a function _kbhit() in conio.h. Not sure if it would be that simple. Write a .c file
#include <conio.h> int main(void) { int ch; ch= _kbhit(); return ch; } Then do the necessary stuff to call that from R. http://mazamascience.com/WorkingWithData/?p=1067 Bill On 06/08/2014, Greg Snow <538...@gmail.com> wrote: > You could create a tcltk window that looks for a button click and/or > key press and when that happens change the value of a variable. Then > in your loop you just look at the value of the same variable and break > when the value changes. > > On Tue, Aug 5, 2014 at 6:13 AM, William Simpson > <william.a.simp...@gmail.com> wrote: >> This works, but it is not quite what I need: >> >> par(mar=rep(0,4)) >> >> while(1) >> { >> img1<-matrix(runif(2500),50,50) >> dev.hold(); image(img1,useRaster=TRUE); dev.flush() >> img2<-matrix(runif(2500),50,50) >> dev.hold(); image(img2,useRaster=TRUE); dev.flush() >> } >> >> I would like to do this: >> while(!kbhit()) >> { >> ... >> >> where kbhit() polls the keyboard, returning a non-zero integer if the >> keyboard buffer has something in it. The animation loop continues >> until a key is pressed. >> >> All the ways of getting user input I have seen (e.g. getGraphicsEvent) >> are not suitable because they would wait on each pass through the loop >> until the key is pressed and therefore no animation would be >> presented. >> >> Any ideas on how to present a continuous animation loop which is >> broken upon user input (keypress or mouse button press)? I am using >> Windows 7. Thanks very much for any help. >> >> Bill >> >> ______________________________________________ >> 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. > > > > -- > Gregory (Greg) L. Snow Ph.D. > 538...@gmail.com > ______________________________________________ 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.