Consider the following:
par(mar=c(0,0,0,0),xaxs = 'i',yaxs='i')
plot.new()
for(i in 1:20)
{
z <- matrix(runif(256*256), ncol=256)
dev.hold()
image(z, col=grey(0:255/255),zlim=c(0,1),useRaster=TRUE)
dev.flush()
Sys.sleep(.1)
}
I would like to continuously display the animation until a mouse click
happens. Obviously, locator() can't be used for this, because it will halt
the animation while waiting for the mouse click. So something like this
won't work:
while((r<-locator(n=1)) == NULL)
{
z <- matrix(runif(256*256), ncol=256)
dev.hold()
image(z, col=grey(0:255/255),zlim=c(0,1),useRaster=TRUE)
dev.flush()
Sys.sleep(.1)
}
Can somebody suggest a way to get user input while displaying the
animation? I am willing to use a keypress if not the mouse. Essentially, I
need an input routine that does not wait for a response but just checks at
one instant (like kbhit in C).
Thanks very much for any help.
Stan
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