def setup(self):
# The has_already_setup attr is to not break all the old Scenes
if hasattr(self, "has_already_setup"):
return
self.has_already_setup = True
self.background_mobjects = []
self.submobjects = []
self.transformable_mobjects = []
self.moving_vectors = []
self.transformable_labels = []
self.moving_mobjects = []
self.t_matrix = np.array(self.t_matrix)
self.background_plane = NumberPlane(**self.background_plane_kwargs)
if self.show_coordinates:
self.background_plane.add_coordinates()
if self.include_background_plane:
self.add_background_mobject(self.background_plane)
if self.include_foreground_plane:
self.plane = NumberPlane(**self.foreground_plane_kwargs)
self.add_transformable_mobject(self.plane)
if self.show_basis_vectors:
self.basis_vectors = self.get_basis_vectors(
i_hat_color=self.i_hat_color,
j_hat_color=self.j_hat_color,
)
self.moving_vectors += list(self.basis_vectors)
self.i_hat, self.j_hat = self.basis_vectors
self.add(self.basis_vectors)
def construct(self):
my_plane = NumberPlane(x_line_frequency=2,
y_line_frequency=2,
faded_line_ratio=2)
my_plane.add(my_plane.get_axis_labels())
self.add(my_plane)
self.wait()
def construct(self):
plane = NumberPlane(**self.plane_kwargs)
plane.add(plane.get_axis_labels())
self.add(plane)
self.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)
])
source_charge = self.Positron().move_to(self.point_charge_loc)
self.play(FadeIn(source_charge))
self.play(ShowCreation(self.field))
self.moving_charge()
def add_plane(self, animate=False, **kwargs):
"""
Adds a NumberPlane object to the background.
Parameters
----------
animate : (bool=False)
Whether or not to animate the addition of the plane via ShowCreation.
**kwargs
Any valid keyword arguments accepted by NumberPlane.
Returns
-------
NumberPlane
The NumberPlane object.
"""
plane = NumberPlane(**kwargs)
if animate:
self.play(ShowCreation(plane, lag_ratio=0.5))
self.add(plane)
return plane
def construct(self):
plane = NumberPlane()
plane.add(plane.get_axis_labels())
self.add(plane)
points = [
x * RIGHT + y * UP for x in np.arange(-5, 5, 1)
for y in np.arange(-5, 5, 1)
]
vec_field = []
for point in points:
field = 0.5 * RIGHT + 0.5 * UP
result = Vector(field).shift(point)
vec_field.append(result)
draw_field = VGroup(*vec_field)
self.play(ShowCreation(draw_field))
self.wait(2)
def construct(self):
# Background
plane = NumberPlane(x_range=(0, 14, 0.5), y_range=(0, 8, 0.5))
plane.axes.set_stroke(BLUE, 1)
plane.fade(0.5)
self.add(plane)
# Pis
pis = self.get_pis()
pis.set_height(self.pi_height)
pis.arrange(RIGHT, aligned_edge=DOWN)
pis.move_to(self.pi_bottom, DOWN)
self.pis = pis
self.add(pis)
plane.move_to(pis.get_bottom() + SMALL_BUFF * DOWN)
# Message
if self.use_date:
message = self.get_date_message()
else:
message = self.get_probabalistic_message()
message.set_height(self.message_height)
message.next_to(pis, DOWN)
message.set_stroke(BLACK, 5, background=True)
self.add(message)
# Suppoerter note
if self.add_supporter_note:
note = self.get_supporter_note()
note.scale(0.5)
message.shift((MED_SMALL_BUFF - SMALL_BUFF) * UP)
note.next_to(message, DOWN, SMALL_BUFF)
self.add(note)
yellow_parts = [sm for sm in message if sm.get_color() == YELLOW]
for pi in pis:
if yellow_parts:
pi.look_at(yellow_parts[-1])
else:
pi.look_at(message)
def add_plane(self, animate=False, **kwargs):
plane = NumberPlane(**kwargs)
if animate:
self.play(ShowCreation(plane, lag_ratio=0.5))
self.add(plane)
return plane
def add_plane(self, animate=False, **kwargs):
plane = NumberPlane(**kwargs)
if animate:
self.play(ShowCreation(plane, submobject_mode="lagged_start"))
self.add(plane)
return plane