function reachable_squares()
{
#Array of square where the piece can move to
$squares = array();
$csq = $this->get_current_square();
$hdist = abs(Board::horz_distance("a1", $csq));
$vdist = abs(Board::vert_distance("a1", $csq));
$dist = $hdist > $vdist ? $vdist : $hdist;
$sq = Board::add_horz_distance($csq, -$dist);
$sq = Board::add_vert_distance($sq, -$dist);
$squares = array_merge($squares, Board::squares_in_line($csq, $sq));
$hdist = abs(Board::horz_distance("h1", $csq));
$vdist = abs(Board::vert_distance("h1", $csq));
$dist = $hdist > $vdist ? $vdist : $hdist;
$sq = Board::add_horz_distance($csq, $dist);
$sq = Board::add_vert_distance($sq, -$dist);
$squares = array_merge($squares, Board::squares_in_line($csq, $sq));
$hdist = abs(Board::horz_distance("a8", $csq));
$vdist = abs(Board::vert_distance("a8", $csq));
$dist = $hdist > $vdist ? $vdist : $hdist;
$sq = Board::add_horz_distance($csq, -$dist);
$sq = Board::add_vert_distance($sq, $dist);
$squares = array_merge($squares, Board::squares_in_line($csq, $sq));
$hdist = abs(Board::horz_distance("h8", $csq));
$vdist = abs(Board::vert_distance("h8", $csq));
$dist = $hdist > $vdist ? $vdist : $hdist;
$sq = Board::add_horz_distance($csq, $dist);
$sq = Board::add_vert_distance($sq, $dist);
$squares = array_merge($squares, Board::squares_in_line($csq, $sq));
#Removes current position square
$squares = preg_grep("/^{$csq}\$/", $squares, PREG_GREP_INVERT);
return $squares;
}
function reachable_squares()
{
#Array of square where the piece can move to
$squares = array();
$csq = $this->get_current_square();
$tsq = Board::add_vert_distance($csq, 2);
if ($tsq) {
$sq = Board::square_right_of($tsq);
if ($sq) {
$squares[] = $sq;
}
$sq = Board::square_left_of($tsq);
if ($sq) {
$squares[] = $sq;
}
}
$tsq = Board::add_vert_distance($csq, -2);
if ($tsq) {
$sq = Board::square_right_of($tsq);
if ($sq) {
$squares[] = $sq;
}
$sq = Board::square_left_of($tsq);
if ($sq) {
$squares[] = $sq;
}
}
$tsq = Board::add_horz_distance($csq, 2);
if ($tsq) {
$sq = Board::square_up_from($tsq);
if ($sq) {
$squares[] = $sq;
}
$sq = Board::square_down_from($tsq);
if ($sq) {
$squares[] = $sq;
}
}
$tsq = Board::add_horz_distance($csq, -2);
if ($tsq) {
$sq = Board::square_up_from($tsq);
if ($sq) {
$squares[] = $sq;
}
$sq = Board::square_down_from($tsq);
if ($sq) {
$squares[] = $sq;
}
}
return $squares;
}
function reachable_squares()
{
#Array of square where the piece can move to
$squares = array();
$csq = $this->get_current_square();
$x = Board::horz_distance("a4", $csq);
$y = Board::vert_distance("d1", $csq);
$row_start = 'a' . ($y + 1);
$row_end = 'h' . ($y + 1);
$col_start = chr(ord('a') + $x) . '1';
$col_end = chr(ord('a') + $x) . '8';
$row = Board::squares_in_line($row_start, $row_end);
$col = Board::squares_in_line($col_start, $col_end);
$squares = array_merge($squares, $row, $col);
$hdist = abs(Board::horz_distance("a1", $csq));
$vdist = abs(Board::vert_distance("a1", $csq));
$dist = $hdist > $vdist ? $vdist : $hdist;
$sq = Board::add_horz_distance($csq, -$dist);
$sq = Board::add_vert_distance($sq, -$dist);
$squares = array_merge($squares, Board::squares_in_line($csq, $sq));
$hdist = abs(Board::horz_distance("h1", $csq));
$vdist = abs(Board::vert_distance("h1", $csq));
$dist = $hdist > $vdist ? $vdist : $hdist;
$sq = Board::add_horz_distance($csq, $dist);
$sq = Board::add_vert_distance($sq, -$dist);
$squares = array_merge($squares, Board::squares_in_line($csq, $sq));
$hdist = abs(Board::horz_distance("a8", $csq));
$vdist = abs(Board::vert_distance("a8", $csq));
$dist = $hdist > $vdist ? $vdist : $hdist;
$sq = Board::add_horz_distance($csq, -$dist);
$sq = Board::add_vert_distance($sq, $dist);
$squares = array_merge($squares, Board::squares_in_line($csq, $sq));
$hdist = abs(Board::horz_distance("h8", $csq));
$vdist = abs(Board::vert_distance("h8", $csq));
$dist = $hdist > $vdist ? $vdist : $hdist;
$sq = Board::add_horz_distance($csq, $dist);
$sq = Board::add_vert_distance($sq, $dist);
$squares = array_merge($squares, Board::squares_in_line($csq, $sq));
#Removes current position square
$squares = preg_grep("/^{$csq}\$/", $squares, PREG_GREP_INVERT);
return $squares;
}
