public function __construct($random = false)
{
if (!$random instanceof Random) {
$random = new Random();
}
$this->xCoord = $random->nextFloat() * 256;
$this->yCoord = $random->nextFloat() * 256;
$this->zCoord = $random->nextFloat() * 256;
for ($i = 0; $i < 512; ++$i) {
$this->permutations[$i] = 0;
}
for ($i = 0; $i < 256; ++$i) {
$this->permutations[$i] = $i;
}
for ($i = 0; $i < 256; ++$i) {
$j = $random->nextRange(0, 256 - $i) + $i;
$k = $this->permutations[$i];
$this->permutations[$i] = $this->permutations[$j];
$this->permutations[$j] = $k;
$this->permutations[$i + 256] = $this->permutations[$i];
}
}