/**
* hot_fields()
*/
function hot_fields($board_array, $current_player)
{
$ret = array();
$hot_array = new_board();
$movable_opponents = find_movable_pieces($board_array, !$current_player);
foreach ($movable_opponents as $from_field) {
$possible_moves = possible_move_list($board_array, !$current_player, $from_field);
foreach ($possible_moves as $to_field) {
list($row, $col) = field_to_rowcol($to_field);
$hot_array[$row][$col] = 'not empty';
}
}
for ($row = 0; $row < 8; $row++) {
for ($col = 0; $col < 8; $col++) {
if ($hot_array[$row][$col] == 'not empty') {
$ret[] = rowcol_to_field($row, $col);
}
}
}
return $ret;
}
/**
* find_movable_pieces() - Creates $clickable (Array of field names)
* Checks the board for pieces that can be moved.
* If all your pieces are boxed in or any move would result in your king to
* get into check, an empty array is returned, indicating the end of the game.
*/
function find_movable_pieces($board_array, $current_player)
{
$ret = array();
$player_pieces = get_player_pieces($current_player);
for ($row = 0; $row < 8; $row++) {
for ($col = 0; $col < 8; $col++) {
$piece = $board_array[$row][$col];
if ($piece != '' && strpos($player_pieces, $piece) !== false) {
$field = rowcol_to_field($row, $col);
// Check, if piece can move at all
$moves = possible_move_list($board_array, $current_player, $field);
// First entry of the returned move list is
// the FIELD of the currently checked piece:
if (isset($moves[1])) {
$ret[] = $field;
// == $moves[0];
}
}
}
}
return $ret;
}
/**
* get_pieces() - Get associative array of pieces orderd by field name
*/
function get_pieces($board)
{
$ret = array();
for ($row = 0; $row < 8; $row++) {
for ($col = 0; $col < 8; $col++) {
if ($board[$row][$col] != '') {
$field = rowcol_to_field($row, $col);
$ret[$field] = $board[$row][$col];
}
}
}
return $ret;
}
function decode_field($code)
{
$p = strpos(LOCATION_CODES, $code);
$col = $p % 8;
$row = ($p - $col) / 8;
return rowcol_to_field($row, $col);
}