def show_ghost_movement(self, vector):
if isinstance(vector, Arrow):
vector = vector.get_end() - vector.get_start()
elif len(vector) == 2:
vector = np.append(np.array(vector), 0.0)
x_max = int(FRAME_X_RADIUS + abs(vector[0]))
y_max = int(FRAME_Y_RADIUS + abs(vector[1]))
dots = VMobject(*[
Dot(x * RIGHT + y * UP) for x in range(-x_max, x_max)
for y in range(-y_max, y_max)
])
dots.set_fill(BLACK, opacity=0)
dots_halfway = dots.copy().shift(vector / 2).set_fill(WHITE, 1)
dots_end = dots.copy().shift(vector)
self.play(Transform(dots, dots_halfway, rate_func=rush_into))
self.play(Transform(dots, dots_end, rate_func=rush_from))
self.remove(dots)
def show_ghost_movement(self, vector):
if isinstance(vector, Arrow):
vector = vector.get_end() - vector.get_start()
elif len(vector) == 2:
vector = np.append(np.array(vector), 0.0)
x_max = int(FRAME_X_RADIUS + abs(vector[0]))
y_max = int(FRAME_Y_RADIUS + abs(vector[1]))
dots = VMobject(*[
Dot(x * RIGHT + y * UP)
for x in range(-x_max, x_max)
for y in range(-y_max, y_max)
])
dots.set_fill(BLACK, opacity=0)
dots_halfway = dots.copy().shift(vector / 2).set_fill(WHITE, 1)
dots_end = dots.copy().shift(vector)
self.play(Transform(
dots, dots_halfway, rate_func=rush_into
))
self.play(Transform(
dots, dots_end, rate_func=rush_from
))
self.remove(dots)
def get_piece_movement(self, pieces):
start = VMobject(*pieces)
target = VMobject(*[mob.target for mob in pieces])
if self.leave_ghost_vectors:
self.add(start.copy().fade(0.7))
return Transform(start, target, submobject_mode="all_at_once")
def get_piece_movement(self, pieces):
start = VMobject(*pieces)
target = VMobject(*[mob.target for mob in pieces])
if self.leave_ghost_vectors:
self.add(start.copy().fade(0.7))
return Transform(start, target, submobject_mode="all_at_once")
