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#!/usr/bin/perl -w
use strict;
use Getopt::Std;
my (%opts) = (
r => 4, # # of rows
c => 4, # # of columns
w => 80, # width of a grid cell
h => 60, # height of a grid cell
l => 1, # lower bound
u => 10, # upper bound
# d => '\\/;/\\', # diagonals
d => 0.9, # probability of generating each diagonal
);
getopts('r:c:l:u:w:h:d:', \%opts);
# $opts{d} = [ map { [split "", $_] } split ";", $opts{d}];
sub randfill {
my ($adj) = @_;
my ($v, $w);
foreach $v (keys %$adj) {
foreach $w (keys %{ $adj->{$v} }) {
$adj->{$v}{$w} = $adj->{$w}{$v} =
int(rand($opts{u}-$opts{l})) + $opts{l};
}
}
}
sub rc2name {
my ($r, $c) = @_;
return "" if ($r>=$opts{r} or $c>=$opts{c});
return chr(ord('A') + $opts{c}*$r + $c)
if ($opts{c}*$opts{r} <= 26);
return chr(ord('A') + $r) . chr(ord('A') + $c);
}
sub name2rc {
my ($name) = @_;
my ($r) = ord($name) - ord('A');
return (int($r / $opts{c}), $r % $opts{c})
if (length($name) == 1);
my ($c) = ord(substr($name,1)) - ord('A');
return ($r, $c);
}
sub print_adj {
my ($adj) = @_;
my ($v, $w);
foreach $v (sort keys %$adj) {
my ($r, $c) = name2rc($v);
printf " $v => { -pos=>[%d, %d],\n ",
($c+0.5)*$opts{w}, ($r+0.5)*$opts{h};
foreach $w (sort keys %{ $adj->{$v} }) {
print "\t$w => $adj->{$v}{$w},"
}
print "\n },\n";
}
print "\n}\n";
}
sub rectangular {
my ($i, $j, $adj, $v, $w, $t);
# $dr = $#{$opts{d}} + 1;
# $dc = $#{$opts{d}->[0]} + 1;
for ($i=0; $i<$opts{r}; ++$i) {
for ($j=0; $j<$opts{c}; ++$j) {
$v = rc2name($i, $j);
$adj->{$v}{rc2name($i+1,$j)} = 1;
$adj->{$v}{rc2name($i,$j+1)} = 1;
$t = rand();
if ($t < $opts{d}) {
if ($t / $opts{d} > 0.5) {
$adj->{$v}{rc2name($i+1,$j+1)} = 1;
} else {
$adj->{rc2name($i,$j+1)}{rc2name($i+1,$j)} = 1;
}
}
# if ($opts{d}->[$i % $dr][$j % $dc] eq '\\');
# if ($opts{d}->[$i % $dr][$j % $dc] eq '/');
}
}
foreach $v (keys %$adj) {
if (not $v) {
delete $adj->{$v};
next;
}
foreach $w (keys %{$adj->{$v}}) {
delete $adj->{$v}{$w} if (not $w);
}
}
randfill($adj);
print_adj($adj);
}
#my ($ht) = ($opts{r} + 0.3) * $opts{h};
print <<HDR;
# generated by gengr
{
"-name" => "random grid",
-type => "graph",
-linear_transform => {
-scale => [1, 1],
-offset => [0, 0],
},
-directed => 0,
-init_data => {
HDR
rectangular();
print "\n}\n";
#my ($i,$j);
#for ($i=0; $i<$opts{r}; ++$i) {
# for ($j=0; $j<$opts{c}; ++$j) {
# printf "($i:$j %s %d:%d), ", rc2name($i,$j), name2rc(rc2name($i,$j));
# }
# print "\n";
#}
#my ($i, $j);
#for ($i=0; $i<=$#{$opts{d}}; ++$i) {
# for ($j=0; $j<=$#{$opts{d}->[$i]}; ++$j) {
# print $opts{d}->[$i][$j];
# }
# print "\n";
#}
__END__
=head1 NAME
gen_at_graph - generates a random graph for use in algotutor.
=head1 SYNOPSIS
B<gen_at_graph> [I<OPTION>] ...
=head1 DESCRIPTION
gen_at_graph generates a random graph for use in algotutor. Currently
the only type of graph it can generate is a rectangular grid of
vertices. Each vertex is connected to at most 8 adjacent vertices
around it.
=head1 OPTIONS
=over
=item B<-r> I<ROWS>
generate ROWS rows of vertices
=item B<-c> I<COLS>
generate COLS columns of vertices
=item B<-w> I<WIDTH>
make each grid cell WIDTH pixel wide
=item B<-h> I<HEIGHT>
make each grid cell HEIGHT pixel high
=item B<-l> I<LOWER>
make all random numbers greater than or equal to LOWER
=item B<-u> I<UPPER>
make all random numbers less than (but never equal to) UPPER
=item B<-d> I<PATTERN>
specify the probability of generating each diagonal
=back
=head1 LICENSE
This code is distributed under the GNU General Public License
=head1 AUTHOR
B<Chao-Kuei Hung> ckhung AT cyut DOT edu DOT tw
=head1 SEE ALSO
Please see /usr/share/doc/algotutor/doc/ for the full set of documentations.
=cut
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