'The plot interval for the default geometric plot of line. Gives
values that will produce a line that is +/- 5 units long (where a
unit is the distance between the two points that define the line).
Parameters
parameter : str, optional
Default value is \'t\'.
Returns
plot_interval : list (plot interval)
[parameter, lower_bound, upper_bound]
Examples
>>> from sympy import Point, Line
>>> p1, p2 = Point(0, 0), Point(5, 3)
>>> l1 = Line(p1, p2)
>>> l1.plot_interval()
[t, -5, 5]'

def plot_interval(self, parameter='t'):

    t = _symbol(parameter)
    return [t, (-5), 5]
