def __init__(self, board, parent=None):
super(BoardWidget, self).__init__(parent)
self.board = board
self._selected_field = None # (x_field, y_field) or None
self._available_moves = [] # [(x_field, y_field), ...] or None
self._painter = QPainter()
self._background_brush = QBrush(Qt.gray)
self._white_field_brush = QBrush(Qt.white)
self._black_field_brush = QBrush(Qt.black)
self._white_checker_brush = QBrush(Qt.white)
self._white_king_checker_brush = QBrush(Qt.white)
self._selected_field_brush = QBrush(Qt.blue)
self._available_move_field_brush = QBrush(Qt.green)
self._black_checker_brush = QBrush(Qt.black)
self._black_king_checker_brush = QBrush(Qt.black)
self._white_checker_pen = QPen(QBrush(Qt.gray), 5, j=Qt.RoundJoin)
self._black_checker_pen = QPen(QBrush(Qt.gray), 5, j=Qt.RoundJoin)
self._white_king_checker_pen = QPen(QBrush(Qt.red), 5, j=Qt.RoundJoin)
self._black_king_checker_pen = QPen(QBrush(Qt.red), 5, j=Qt.RoundJoin)
self._border_brush = QBrush(QColor.fromRgb(205, 127, 50))
self._field_size = None
self._border_size = None
