Re: mouse in gnuplot

[Theo H. <th...@ph...>]

Dmitri A. Sergatskov wrote:
> Theo Hopman wrote:
>> This is exactly the expected behaviour. gnuplot sees end of input from 
>> the pipe and quits. The x11 helper program gnuplot_x11 keeps running, 
>> as requested by -persist, but has nowhere to send the mouse events 
>> since gnuplot has finished. Hence, no mousing.
> 
> OK, here is a better test (courtesy of John Eaton):
> 
> mkfifo fifo1
> then in one xterm:
> 
> gnuplot < fifo1
> 
> in another xterm:
> 
> cat > fifo1
> set mouse
> plot sin(x)
> ...
> 
> This works as expected on linux/x86, linux/ppc and is not working on 
> MacOSX/X11... (Tiger 10.4, kernel 8.2.0)

I'm not sure what behaviour you're expecting, but for me this gives 
exactly the same results as with an unnamed pipe: there is a coordinate 
display, but zooming and the like are not available. I did

mkfifo fifo1
gnuplot -persist < fifo1 &
ps -u $USER
cat << EOC > fifo1
set mouse
plot sin(x)
EOC
ps -u $USER # note gnuplot is done but gnuplot_x11 is still running.

Once again, gnuplot sees an end-of-input on the named pipe, and quits. 
To prevent this, you need shell trickery like the following:

gnuplot <fifo1 3>fifo1 &

File descriptor 3 of gnuplot is redirected to the named pipe. As long as 
gnuplot is running (and doesn't close file descriptor 3), it won't 
encounter an end-of-input on the named pipe, and won't quit. Since 
gnuplot is still running, mousing works. Do `echo "quit" > fifo1` or the 
like to make gnuplot quit.

THeo

(BTW: System is Fedora Core 3)