continous update (print)

[Lars Madsen]

if one e.g . wants to write a countdown one can do this as

$|=1;
....
# some loop
printf "% 4d\r", $count;

where \r then makes sure that we reprint on them same line over and over again.

But what if you want to do this with several lines at once?

I have a data structure with, say, 10 special entries that changes every second,
I would like to have a continous overview if these numbers in the same fashion
as above.

How would one do that?

 

[Lars Madsen]

A simple solution is to clear the screen before printing:

my $clear = qx(clear);

while ( 1 ){
print $clear;
printf "%s\n",'some text';
}

well yes, besides the fact that the screen flickers a bit, clearing the screen
seems to work.

 

[anno4000]

Yes it does ... i didn't say it was pretty ... just simple ;-)

Put a delay in the loop and update the screen only once per second or so.
The flicker will get much bettter.

Anno

 

[Lars Madsen]

es it does ... i didn't say it was pretty ... just simple ;-)

Put a delay in the loop and update the screen only once per second or so.
The flicker will get much bettter.

Anno

I already do that, it looks ok.

 

[Jürgen Exner]

if one e.g . wants to write a countdown one can do this as

$|=1;
...
# some loop
printf "% 4d\r", $count;

where \r then makes sure that we reprint on them same line over and
over again.
But what if you want to do this with several lines at once?

I have a data structure with, say, 10 special entries that changes
every second, I would like to have a continous overview if these
numbers in the same fashion as above.

How would one do that?

Use the Curses module to position the cursor before each output block.

jue