gistfile1.py

def dotted_line(**kwargs):
    out = []
    width = kwargs.get('right') - kwargs.get('left')
    dash = kwargs.pop('dash')
    dashcount = width / dash
    new_kwargs = kwargs.copy()
    new_kwargs['left'] = kwargs.get('left') - (dash * 2)
    for d in range(0, int(dashcount)):
        new_kwargs['left'] = new_kwargs['left'] + dash + dash
        new_kwargs['right'] = new_kwargs['left'] + dash
        new_kwargs['bottom'] = new_kwargs['top']
        out.append(Line(**new_kwargs))
    return out