<?php
/*
* This code owes an enormous debt to
* http://www.barrychessclub.org.uk/berger2001.htm
*/
function main() { ?>
<style>
input, textarea { display: block; margin-bottom: 1em; } label { font-weight: bold; display: block; } </style>
<h1>Fixtures Generator</h1>
<p>This page is part of <a
href="http://bluebones.net/2005/05/league-fixtures-generator/">bluebones.net</a>.</p>
<?php
// Find out how many teams we want fixtures for.
if (! isset($_GET['teams']) && ! isset($_GET['names'])) { print get_form();
} else { # XXX check for int
print show_fixtures(isset($_GET['teams']) ? nums(intval($_GET['teams'])) : explode("\n", trim($_GET['names']))); }
}
function nums($n) { $ns = array();
for ($i = 1; $i <= $n; $i++) { $ns[] = $i;
}
return $ns;
}
function show_fixtures($names) { $teams = sizeof($names);
print "<p>Fixtures for $teams teams.</p>";
// If odd number of teams add a "ghost".
$ghost = false;
if ($teams % 2 == 1) { $teams++;
$ghost = true;
}
// Generate the fixtures using the cyclic algorithm.
$totalRounds = $teams - 1;
$matchesPerRound = $teams / 2;
$rounds = array();
for ($i = 0; $i < $totalRounds; $i++) { $rounds[$i] = array();
}
for ($round = 0; $round < $totalRounds; $round++) { for ($match = 0; $match < $matchesPerRound; $match++) { $home = ($round + $match) % ($teams - 1);
$away = ($teams - 1 - $match + $round) % ($teams - 1);
// Last team stays in the same place while the others
// rotate around it.
if ($match == 0) { $away = $teams - 1;
}
$rounds[$round][$match] = team_name($home + 1, $names)
. " vs " . team_name($away + 1, $names);
}
}
// Interleave so that home and away games are fairly evenly dispersed.
$interleaved = array();
for ($i = 0; $i < $totalRounds; $i++) { $interleaved[$i] = array();
}
$evn = 0;
$odd = ($teams / 2);
for ($i = 0; $i < sizeof($rounds); $i++) { if ($i % 2 == 0) { $interleaved[$i] = $rounds[$evn++];
} else { $interleaved[$i] = $rounds[$odd++];
}
}
$rounds = $interleaved;
// Last team can't be away for every game so flip them
// to home on odd rounds.
for ($round = 0; $round < sizeof($rounds); $round++) { if ($round % 2 == 1) { $rounds[$round][0] = flip($rounds[$round][0]);
}
}
// Display the fixtures
for ($i = 0; $i < sizeof($rounds); $i++) { print "<p>Round " . ($i + 1) . "</p>\n";
foreach ($rounds[$i] as $r) { print $r . "<br />";
}
print "<br />";
}
print "<p>Second half is mirror of first half</p>";
$round_counter = sizeof($rounds) + 1;
for ($i = sizeof($rounds) - 1; $i >= 0; $i--) { print "<p>Round " . $round_counter . "</p>\n";
$round_counter += 1;
foreach ($rounds[$i] as $r) { print flip($r) . "<br />";
}
print "<br />";
}
print "<br />";
if ($ghost) { print "Matches against team " . $teams . " are byes.";
}
}
function flip($match) { $components = split(' vs ', $match); return $components[1] . " vs " . $components[0];
}
function team_name($num, $names) { $i = $num - 1;
if (sizeof($names) > $i && strlen(trim($names[$i])) > 0) { return trim($names[$i]);
} else { return $num;
}
}
function get_form() { $s = '';
$s = '<p>Enter number of teams OR team names</p>' . "\n";
$s .= '<form action="' . $_SERVER['SCRIPT_NAME'] . '">' . "\n";
$s .= '<label for="teams">Number of Teams</label><input type="text" name="teams" />' . "\n";
$s .= '<input type="submit" value="Generate Fixtures" />' . "\n";
$s .= '</form>' . "\n";
$s .= '<form action="' . $_SERVER['SCRIPT_NAME'] . '">' . "\n";
$s .= '<div><strong>OR</strong></div>' . "\n";
$s .= '<label for="names">Names of Teams (one per line)</label>'
. '<textarea name="names" rows="8" cols="40"></textarea>' . "\n";
$s .= '<input type="submit" value="Generate Fixtures" />' . "\n";
$s .= "</form>\n";
return $s;
}
main();
?>
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