def __init__(self, mobject: Mobject, tracked_mobject: Mobject, **kwargs):
self.tracked_mobject = tracked_mobject
self.diff = op.sub(
mobject.get_center(),
tracked_mobject.get_center(),
)
super().__init__(mobject, **kwargs)
def flip(self, axis=UP):
Mobject.flip(self, axis=axis)
self.refresh_unit_normal()
self.refresh_triangulation()
if abs(axis[1]) > 0:
self.direction = -np.array(self.direction)
return self
def test_clear_updaters(self):
obj = Mobject()
obj.add_updater(__func__)
obj.add_updater(__dt_func__)
obj.add_updater(__func__)
self.assertListEqual([__func__, __dt_func__, __func__], obj.updaters)
obj.clear_updaters()
self.assertListEqual([], obj.updaters)
def test_remove_updater(self):
obj = Mobject()
obj.add_updater(__func__)
obj.add_updater(__dt_func__)
obj.add_updater(__func__)
self.assertListEqual([__func__, __dt_func__, __func__], obj.updaters)
obj.remove_updater(__func__)
self.assertListEqual([__dt_func__], obj.updaters)
def align_points(self, vmobject):
Mobject.align_points(self, vmobject)
self.align_rgbas(vmobject)
is_subpath = self.is_subpath or vmobject.is_subpath
self.is_subpath = vmobject.is_subpath = is_subpath
mark_closed = self.mark_paths_closed and vmobject.mark_paths_closed
self.mark_paths_closed = vmobject.mark_paths_closed = mark_closed
return self
def test_center(self):
x = random.Random().randint(-1000, 1000)
y = random.Random().randint(-1000, 1000)
z = random.Random().randint(-1000, 1000)
obj = Mobject()
obj.points = np.array([[x, y, z]])
obj.center()
np.testing.assert_array_equal(obj.points, np.zeros((1, 3)))
def apply_function(self, function):
factor = self.pre_function_handle_to_anchor_scale_factor
self.scale_handle_to_anchor_distances(factor)
Mobject.apply_function(self, function)
self.scale_handle_to_anchor_distances(1. / factor)
if self.make_smooth_after_applying_functions:
self.make_smooth()
return self
def test_shift_onto_screen_two(self):
obj = Mobject()
obj.points = np.array([[FRAME_X_RADIUS * 2, 0, 0]])
obj.shift_onto_screen()
np.testing.assert_array_equal(
obj.points,
np.array([[FRAME_X_RADIUS - DEFAULT_MOBJECT_TO_EDGE_BUFFER, 0,
0]]))
def save_mobject_to_file(self,
mobject: Mobject,
file_path: str | None = None) -> None:
if file_path is None:
file_path = self.file_writer.get_saved_mobject_path(mobject)
if file_path is None:
return
mobject.save_to_file(file_path)
def apply_function(self, function):
factor = self.pre_function_handle_to_anchor_scale_factor
self.scale_handle_to_anchor_distances(factor)
Mobject.apply_function(self, function)
self.scale_handle_to_anchor_distances(1. / factor)
if self.make_smooth_after_applying_functions:
self.make_smooth()
return self
def test_rotate_returns_self(self):
a = random.Random().randint(-1000, 1000)
x = random.Random().randint(-1000, 1000)
y = random.Random().randint(-1000, 1000)
z = random.Random().randint(-1000, 1000)
obj = Mobject()
obj.points = np.array([x, y, z])
self.assertEqual(obj, obj.rotate(a, about_point=np.array([0, 0, 0])))
def __init__(self, mobject: Mobject, target_mobject: Mobject, **kwargs):
digest_config(self, kwargs)
assert (isinstance(mobject, self.mobject_type))
assert (isinstance(target_mobject, self.mobject_type))
source_map = self.get_shape_map(mobject)
target_map = self.get_shape_map(target_mobject)
# Create two mobjects whose submobjects all match each other
# according to whatever keys are used for source_map and
# target_map
transform_source = self.group_type()
transform_target = self.group_type()
kwargs["final_alpha_value"] = 0
for key in set(source_map).intersection(target_map):
transform_source.add(source_map[key])
transform_target.add(target_map[key])
anims = [Transform(transform_source, transform_target, **kwargs)]
# User can manually specify when one part should transform
# into another despite not matching by using key_map
key_mapped_source = self.group_type()
key_mapped_target = self.group_type()
for key1, key2 in self.key_map.items():
if key1 in source_map and key2 in target_map:
key_mapped_source.add(source_map[key1])
key_mapped_target.add(target_map[key2])
source_map.pop(key1, None)
target_map.pop(key2, None)
if len(key_mapped_source) > 0:
anims.append(
FadeTransformPieces(
key_mapped_source,
key_mapped_target,
))
fade_source = self.group_type()
fade_target = self.group_type()
for key in set(source_map).difference(target_map):
fade_source.add(source_map[key])
for key in set(target_map).difference(source_map):
fade_target.add(target_map[key])
if self.transform_mismatches:
anims.append(Transform(fade_source.copy(), fade_target, **kwargs))
if self.fade_transform_mismatches:
anims.append(
FadeTransformPieces(fade_source, fade_target, **kwargs))
else:
anims.append(
FadeOutToPoint(fade_source, target_mobject.get_center(),
**kwargs))
anims.append(
FadeInFromPoint(fade_target.copy(), mobject.get_center(),
**kwargs))
super().__init__(*anims)
self.to_remove = mobject
self.to_add = target_mobject
def interpolate_submobject(
self,
submob: Mobject,
start: Mobject,
target_copy: Mobject,
alpha: float
):
submob.interpolate(start, target_copy, alpha, self.path_func)
return self
def test_add_to_back_singly(self):
a, b, c, obj = Mobject(), Mobject(), Mobject(), Mobject()
self.assertListEqual([], obj.submobjects)
obj.add_to_back(a)
self.assertListEqual([a], obj.submobjects)
obj.add_to_back(b)
self.assertListEqual([b, a], obj.submobjects)
obj.add_to_back(c)
self.assertListEqual([c, b, a], obj.submobjects)
def test_add_submobjects_singly(self):
a, b, c, obj = Mobject(), Mobject(), Mobject(), Mobject()
self.assertListEqual([], obj.submobjects)
obj.add(a)
self.assertListEqual([a], obj.submobjects)
obj.add(b)
self.assertListEqual([a, b], obj.submobjects)
obj.add(c)
self.assertListEqual([a, b, c], obj.submobjects)
def move_submobjects_along_vector_field(
mobject: Mobject, func: Callable[[np.ndarray], np.ndarray]) -> Mobject:
def apply_nudge(mob, dt):
for submob in mob:
x, y = submob.get_center()[:2]
if abs(x) < FRAME_WIDTH and abs(y) < FRAME_HEIGHT:
submob.shift(func(submob.get_center()) * dt)
mobject.add_updater(apply_nudge)
return mobject
def get_corner_dots(self, mobject: Mobject) -> Mobject:
dots = DotCloud(**self.corner_dot_config)
radius = self.corner_dot_config["radius"]
if mobject.get_depth() < 1e-2:
vects = [DL, UL, UR, DR]
else:
vects = np.array(list(it.product(*3 * [[-1, 1]])))
dots.add_updater(lambda d: d.set_points(
[mobject.get_corner(v) + v * radius for v in vects]))
return dots
def test_remove_singly(self):
a, b, c, obj = Mobject(), Mobject(), Mobject(), Mobject()
obj.add(a, b, c)
self.assertListEqual([a, b, c], obj.submobjects)
obj.remove(a)
self.assertListEqual([b, c], obj.submobjects)
obj.remove(b)
self.assertListEqual([c], obj.submobjects)
obj.remove(c)
self.assertListEqual([], obj.submobjects)
def __init__(self, **kwargs):
if not hasattr(self, "args"):
self.args = serialize_args([])
if not hasattr(self, "config"):
self.config = serialize_config({
**kwargs,
})
digest_config(self, kwargs)
self.epsilon = 1.0 / self.density
Mobject.__init__(self, **kwargs)
def __init__(self, condition=(lambda x, y: True), **kwargs):
"""
Condition must be a function which takes in two real
arrays (representing x and y values of space respectively)
and return a boolean array. This can essentially look like
a function from R^2 to {True, False}, but & and | must be
used in place of "and" and "or"
"""
Mobject.__init__(self, **kwargs)
self.condition = condition
def move_along_vector_field(
mobject: Mobject,
func: Callable[[np.ndarray], np.ndarray]
) -> Mobject:
mobject.add_updater(
lambda m, dt: m.shift(
func(m.get_center()) * dt
)
)
return mobject
def __init__(self, condition=(lambda x, y: True), **kwargs):
"""
Condition must be a function which takes in two real
arrays (representing x and y values of space respectively)
and return a boolean array. This can essentially look like
a function from R^2 to {True, False}, but & and | must be
used in place of "and" and "or"
"""
Mobject.__init__(self, **kwargs)
self.condition = condition
def test_scale(self):
s = random.Random().randint(-1000, 1000)
x = random.Random().randint(-1000, 1000)
y = random.Random().randint(-1000, 1000)
z = random.Random().randint(-1000, 1000)
obj = Mobject()
obj.points = np.array([[x, y, z]])
obj.scale(s, about_point=np.array([0, 0, 0]))
np.testing.assert_array_equal(obj.points,
np.array([[x * s, y * s, z * s]]))
def interpolate_submobject(
self,
submob: Mobject,
start: Mobject,
alpha: float
) -> None:
submob.match_points(start)
submob.apply_function(
self.function_at_time_t(alpha),
**self.apply_function_kwargs
)
def __init__(self, AnimationClass, mobjects, **kwargs):
full_kwargs = AnimationClass.CONFIG
full_kwargs.update(kwargs)
full_kwargs["mobject"] = Mobject(*[
mob.get_point_mobject()
for mob in mobjects
])
self.centers_container = AnimationClass(**full_kwargs)
full_kwargs.pop("mobject")
Animation.__init__(self, Mobject(*mobjects), **full_kwargs)
self.name = str(self) + AnimationClass.__name__
def __init__(self, value=0, **kwargs):
if not hasattr(self, "args"):
self.args = serialize_args([])
if not hasattr(self, "config"):
self.config = serialize_config({
'value': value,
**kwargs,
})
Mobject.__init__(self, **kwargs)
self.points = np.zeros((1, 3))
self.set_value(value)
def move_points_along_vector_field(
mobject: Mobject, func: Callable[[float, float], Iterable[float]],
coordinate_system: CoordinateSystem) -> Mobject:
cs = coordinate_system
origin = cs.get_origin()
def apply_nudge(self, dt):
mobject.apply_function(lambda p: p +
(cs.c2p(*func(*cs.p2c(p))) - origin) * dt)
mobject.add_updater(apply_nudge)
return mobject
def test_shift(self):
a = random.Random().randint(-1000, 1000)
b = random.Random().randint(-1000, 1000)
c = random.Random().randint(-1000, 1000)
x = random.Random().randint(-1000, 1000)
y = random.Random().randint(-1000, 1000)
z = random.Random().randint(-1000, 1000)
obj = Mobject()
obj.points = np.array([[x, y, z]])
obj.shift(np.array([a, b, c]))
np.testing.assert_array_equal(obj.points,
np.array([[x + a, y + b, z + c]]))
def test_match_updater_2(self):
a, b = Mobject(), Mobject()
a.add_updater(__func__)
a.add_updater(__dt_func__)
self.assertListEqual([__func__, __dt_func__], a.updaters)
self.assertListEqual([], b.updaters)
a.match_updaters(b)
self.assertListEqual([], a.updaters)
self.assertListEqual([], b.updaters)
def __init__(self, **kwargs):
digest_config(self, kwargs, locals())
if self.file_name is None:
raise Exception("Must invoke Bubble subclass")
SVGMobject.__init__(self, self.file_name, **kwargs)
self.center()
self.stretch_to_fit_height(self.height)
self.stretch_to_fit_width(self.width)
if self.direction[0] > 0:
self.flip()
self.direction_was_specified = ("direction" in kwargs)
self.content = Mobject()
self.refresh_triangulation()
def __init__(self, mobject: Mobject, **kwargs):
digest_config(self, kwargs, locals())
left_x = mobject.get_left()[0]
right_x = mobject.get_right()[0]
vect = self.amplitude * self.direction
def homotopy(x, y, z, t):
alpha = (x - left_x) / (right_x - left_x)
power = np.exp(2.0 * (alpha - 0.5))
nudge = there_and_back(t**power)
return np.array([x, y, z]) + nudge * vect
super().__init__(homotopy, mobject, **kwargs)
def get_mobjects_to_display(self,
mobjects,
include_submobjects=True,
excluded_mobjects=None):
if include_submobjects:
mobjects = Mobject.extract_mobject_family_members(
mobjects,
only_those_with_points=True,
)
if excluded_mobjects:
all_excluded = Mobject.extract_mobject_family_members(
excluded_mobjects)
mobjects = list_difference_update(mobjects, all_excluded)
return mobjects
def __init__(self, **kwargs):
digest_config(self, kwargs, locals())
if self.file_name is None:
raise Exception("Must invoke Bubble subclass")
try:
SVGMobject.__init__(self, **kwargs)
except IOError as err:
self.file_name = os.path.join(FILE_DIR, self.file_name)
SVGMobject.__init__(self, **kwargs)
self.center()
self.stretch_to_fit_height(self.height)
self.stretch_to_fit_width(self.width)
if self.direction[0] > 0:
Mobject.flip(self)
self.direction_was_specified = ("direction" in kwargs)
self.content = Mobject()
def __init__(self, **kwargs):
digest_config(self, kwargs)
self.epsilon = 1.0 / self.density
Mobject.__init__(self, **kwargs)
def get_array_attrs(self):
return Mobject.get_array_attrs(self) + ["rgbas"]
def match_colors(self, mobject):
Mobject.align_data(self, mobject)
self.rgbas = np.array(mobject.rgbas)
return self
class Bubble(SVGMobject):
CONFIG = {
"direction": LEFT,
"center_point": ORIGIN,
"content_scale_factor": 0.75,
"height": 5,
"width": 8,
"bubble_center_adjustment_factor": 1. / 8,
"file_name": None,
"fill_color": BLACK,
"fill_opacity": 0.8,
"stroke_color": WHITE,
"stroke_width": 3,
}
def __init__(self, **kwargs):
digest_config(self, kwargs, locals())
if self.file_name is None:
raise Exception("Must invoke Bubble subclass")
try:
SVGMobject.__init__(self, **kwargs)
except IOError as err:
self.file_name = os.path.join(FILE_DIR, self.file_name)
SVGMobject.__init__(self, **kwargs)
self.center()
self.stretch_to_fit_height(self.height)
self.stretch_to_fit_width(self.width)
if self.direction[0] > 0:
Mobject.flip(self)
self.direction_was_specified = ("direction" in kwargs)
self.content = Mobject()
def get_tip(self):
# TODO, find a better way
return self.get_corner(DOWN + self.direction) - 0.6 * self.direction
def get_bubble_center(self):
factor = self.bubble_center_adjustment_factor
return self.get_center() + factor * self.get_height() * UP
def move_tip_to(self, point):
mover = VGroup(self)
if self.content is not None:
mover.add(self.content)
mover.shift(point - self.get_tip())
return self
def flip(self):
Mobject.flip(self)
self.direction = -np.array(self.direction)
return self
def pin_to(self, mobject):
mob_center = mobject.get_center()
want_to_flip = np.sign(mob_center[0]) != np.sign(self.direction[0])
can_flip = not self.direction_was_specified
if want_to_flip and can_flip:
self.flip()
boundary_point = mobject.get_critical_point(UP - self.direction)
vector_from_center = 1.0 * (boundary_point - mob_center)
self.move_tip_to(mob_center + vector_from_center)
return self
def position_mobject_inside(self, mobject):
scaled_width = self.content_scale_factor * self.get_width()
if mobject.get_width() > scaled_width:
mobject.set_width(scaled_width)
mobject.shift(
self.get_bubble_center() - mobject.get_center()
)
return mobject
def add_content(self, mobject):
self.position_mobject_inside(mobject)
self.content = mobject
return self.content
def write(self, *text):
self.add_content(TextMobject(*text))
return self
def resize_to_content(self):
target_width = self.content.get_width()
target_width += max(MED_LARGE_BUFF, 2)
target_height = self.content.get_height()
target_height += 2.5 * LARGE_BUFF
tip_point = self.get_tip()
self.stretch_to_fit_width(target_width)
self.stretch_to_fit_height(target_height)
self.move_tip_to(tip_point)
self.position_mobject_inside(self.content)
def clear(self):
self.add_content(VMobject())
return self
def flip(self):
Mobject.flip(self)
self.direction = -np.array(self.direction)
return self
