public function __toString()
{
return sprintf("(face=%d, pos=%16x, level=%d)", $this->face(), $this->pos(), $this->level());
}
public static function initLookupCell($level, $i, $j, $origOrientation, $pos, $orientation)
{
if ($level == self::LOOKUP_BITS) {
$ij = ($i << self::LOOKUP_BITS) + $j;
self::$LOOKUP_POS[($ij << 2) + $origOrientation] = ($pos << 2) + $orientation;
self::$LOOKUP_IJ[($pos << 2) + $origOrientation] = ($ij << 2) + $orientation;
} else {
$level++;
$i <<= 1;
$j <<= 1;
$pos <<= 2;
// Initialize each sub-cell recursively.
for ($subPos = 0; $subPos < 4; $subPos++) {
$ij = S2::posToIJ($orientation, $subPos);
$orientationMask = S2::posToOrientation($subPos);
self::initLookupCell($level, $i + ($ij >> 1 & PHP_INT_MAX >> 0), $j + ($ij & 1), $origOrientation, $pos + $subPos, $orientation ^ $orientationMask);
/* >>> */
}
}
}
}
S2CellId::$LOOKUP_POS = array_pad(array(), 1 << 2 * S2CellId::LOOKUP_BITS + 2, 0);
S2CellId::$LOOKUP_IJ = array_pad(array(), 1 << 2 * S2CellId::LOOKUP_BITS + 2, 0);
S2CellId::initLookupCell(0, 0, 0, 0, 0, 0);
S2CellId::initLookupCell(0, 0, 0, S2CellId::SWAP_MASK, 0, S2CellId::SWAP_MASK);
S2CellId::initLookupCell(0, 0, 0, S2CellId::INVERT_MASK, 0, S2CellId::INVERT_MASK);
S2CellId::initLookupCell(0, 0, 0, S2CellId::SWAP_MASK | S2CellId::INVERT_MASK, 0, S2CellId::SWAP_MASK | S2CellId::INVERT_MASK);