    def __init__(self, width, height, uni=False, style=SINGLE_LINE):
        """
        :param width: width of box
        :param height: height of box
        :param uni: True to use UNICODE character set, defaults to False
        :param style: desired line style, based on line style definitions in
            :mod:`~asciimatics.constants`: `ASCII_LINE`, `SINGLE_LINE`,
            `DOUBLE_LINE`. `uni` parameter takes precedence and the style will be
            ignored if `uni==False`
        """
        super().__init__()
        self._images = [BoxTool(uni, style).box(width, height)]
:param width: width of box
:param height: height of box
:param uni: True to use UNICODE character set, defaults to False
:param style: desired line style, based on line style definitions in
:mod:`~asciimatics.constants`: `ASCII_LINE`, `SINGLE_LINE`,
`DOUBLE_LINE`. `uni` parameter takes precedence and the style will be
ignored if `uni==False`
asciimatics/renderers/box.py