function createTableRow($row)
{
$html = '<tr>';
$html .= createTableCell($row, 'factor');
for ($column = 0; $column <= 12; $column++) {
$grid = $row * $column;
if (isSquare($row, $column)) {
$html .= createTableCell($grid, 'squarenum');
} else {
$html .= createTableCell($grid, 'plain');
}
}
$html .= '</tr>';
return $html;
}
$this->y = $y;
}
}
function isSquare($points)
{
$distances = array();
for ($i = 0; $i < count($points); $i++) {
$p1 = $points[$i];
for ($j = $i + 1; $j < count($points); $j++) {
$p2 = $points[$j];
$dx = $p1->x - $p2->x;
$dy = $p1->y - $p2->y;
$distances[] = $dx * $dx + $dy * $dy;
}
}
sort($distances);
return $distances[0] == $distances[1] && $distances[1] == $distances[2] && $distances[2] == $distances[3] && $distances[4] == $distances[5];
}
function readPoints($line)
{
foreach (array("(", ")", " ") as $char_to_remove) {
$line = str_replace($char_to_remove, "", $line);
}
$coords = explode(",", $line);
return array(new Point($coords[0], $coords[1]), new Point($coords[2], $coords[3]), new Point($coords[4], $coords[5]), new Point($coords[6], $coords[7]));
}
foreach (file($argv[1]) as $line) {
$points = readPoints(trim($line));
echo isSquare($points) ? "true" : "false";
echo "\n";
}
