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#!/usr/bin/perl -w
use strict;
my $true = 1;
my $false = 0;
########################################
my $usage_msg = <<'EOF';
Usage:
select.plane [ xy | xz | yz ]
This script reads an AHFinderDirect horizon-shape data file from
standard input, with file format
dpx dpy radius x y z
selects the subset of the data which lies in the specified plane,
and writes that to standard output.
EOF
########################################
if (scalar(@ARGV) != 1)
{ die $usage_msg; }
my $xy_plane_flag = $false;
my $xz_plane_flag = $false;
my $yz_plane_flag = $false;
if ($ARGV[0] eq 'xy') { $xy_plane_flag = $true; }
elsif ($ARGV[0] eq 'xz') { $xz_plane_flag = $true; }
elsif ($ARGV[0] eq 'yz') { $yz_plane_flag = $true; }
else { die $usage_msg; }
while (my $line = <STDIN>)
{
chomp($line);
# echo blank or comment lines
if (($line =~ /^$/) || ($line =~ /^#/))
{
print $line, "\n";
next; # *** LOOP CONTROL ***
}
my ($dpx,$dpy,$radius,$x,$y,$z) = split(/\s+/, $line);
if ( ($xy_plane_flag && (abs($z) <= 1.0e-10))
|| ($xz_plane_flag && (abs($y) <= 1.0e-10))
|| ($yz_plane_flag && (abs($x) <= 1.0e-10)) )
{ print $line, "\n"; }
}
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