def construct(self):
    plane = NumberPlane(**self.plane_kwargs)
    plane.main_lines.fade(0.9)
    plane.add(plane.get_axis_labels())
    self.add(plane)
    field = VGroup(*[self.calc_field(((x * RIGHT) + (y * UP))) for x in np.arange((- 9), 9, 1) for y in np.arange((- 5), 5, 1)])
    self.play(ShowCreation(field))
def construct(self):
    plane = NumberPlane(**self.plane_kwargs)
    plane.main_lines.fade(0.9)
    plane.add(plane.get_axis_labels())
    self.add(plane)
    field = VGroup(*[self.calc_field(((x * RIGHT) + (y * UP))) for x in np.arange((- 9), 9, 1) for y in np.arange((- 5), 5, 1)])
    self.play(ShowCreation(field))