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#!/usr/bin/perl
#
# panner.pl: start up x11vnc in '-clip' mode viewing a small (WxH)
# rectangular region of the screen. Allow the viewer user
# to 'pan' around the display region by moving the mouse.
#
# Remote interaction with applications, e.g. clicking a
# button though the VNC viewer, will be very difficult.
# This may be useful in a 'demo' mode where the user sitting
# at the physical display is the only one moving the mouse.
# Depending on your usage the following x11vnc options may
# be useful: -nonap
#
# Usage: panner.pl WxH <x11vnc-args> (e.g. -display ...)
# or panner.pl WxH:0.05 <x11vnc-args> (e.g. 0.05 is polling time in secs.)
use strict;
my $WxH = shift;
my $poll_time;
# split off poll time:
#
($WxH, $poll_time) = split(/:/, $WxH);
my ($W, $H) = split(/x/, $WxH);
$poll_time = 0.1 unless $poll_time ne '';
# set to x11vnc command (e.g. full PATH)
#
my $x11vnc = "x11vnc";
# check if display was given:
#
my $query_args = "";
for (my $i=0; $i < @ARGV; $i++) {
if ($ARGV[$i] eq '-display') {
$query_args = "-display $ARGV[$i+1]";
}
}
# find the size of display and the current mouse position:
my %v;
vset("DIRECT:wdpy_x,wdpy_y,pointer_x,pointer_y,pointer_same");
# set a -clip argument based on the above:
#
my $clip = '';
clip_set();
$clip = "${W}x${H}+0+0" unless $v{pointer_same};
# launch x11vnc with -clip in the background:
#
my $cmd = "$x11vnc -clip $clip -bg " . join(" ", @ARGV);
print STDERR "running: $cmd\n";
system $cmd;
# user can hit Ctrl-C or kill this script to quit (and stop x11vnc)
#
sub quit {
system("$x11vnc $query_args -R stop");
exit 0;
}
$SIG{INT} = \&quit;
$SIG{TERM} = \&quit;
# loop forever waiting for mouse position to change, then shift -clip:
#
my $clip_old = $clip;
while (1) {
fsleep($poll_time);
vset("pointer_x,pointer_y,pointer_same");
next unless $v{pointer_same};
clip_set();
if ($clip ne $clip_old) {
system("$x11vnc $query_args -R clip:$clip");
$clip_old = $clip
}
}
exit 0;
# short sleep:
#
sub fsleep {
my ($time) = @_;
select(undef, undef, undef, $time) if $time;
}
# set the -clip string, making sure view doesn't go off edges of display:
#
sub clip_set {
my $x = int($v{pointer_x} - $W/2);
my $y = int($v{pointer_y} - $H/2);
$x = 0 if $x < 0;
$y = 0 if $y < 0;
$x = $v{wdpy_x} - $W if $x + $W > $v{wdpy_x};
$y = $v{wdpy_y} - $H if $y + $H > $v{wdpy_y};
$clip = "${W}x${H}+$x+$y";
}
# query x11vnc for values, put results in the %v hash:
#
sub vset {
my $str = shift;
my $out = `$x11vnc $query_args -Q $str 2>/dev/null`;
chomp $out;
foreach my $pair (split(/,/, $out)) {
$pair =~ s/^a..=//;
my ($k, $v) = split(/:/, $pair, 2);
if ($k ne '' && $v ne '') {
print STDERR "k=$k v=$v\n" if $ENV{DEBUG};
$v{$k} = $v;
}
}
}
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