@staticmethod
def _draw_vline(**kwargs):
    """Draw a grid of vertical lines."""
    for x in range(0, kwargs['im_width'], kwargs['grid_size']):
        kwargs['grid'].line([(min(max(x, kwargs['padding_left']), kwargs[
            'im_width'] - kwargs['padding_right']), max(0, kwargs[
            'padding_top'])), (min(max(x, kwargs['padding_left']), kwargs[
            'im_width'] - kwargs['padding_right']), kwargs['im_height'] -
            kwargs['padding_bottom'])], fill=kwargs['grid_colour'], width=
            kwargs['line_width'])
