def init_colors(self):
VMobject.init_colors(self)
self.axes.set_stroke(self.axes_color, self.stroke_width)
self.main_lines.set_stroke(self.color, self.stroke_width)
self.secondary_lines.set_stroke(self.secondary_color,
self.secondary_stroke_width)
return self
def __init__(self, vmobject=None, **kwargs):
VMobject.__init__(self, **kwargs)
if vmobject is not None:
self.points = np.array(vmobject.points)
self.match_style(vmobject, family=False)
self.submobjects = [
ThreeDVMobject(submob, **kwargs)
for submob in vmobject.submobjects
]
def init_colors(self):
VMobject.init_colors(self)
internal_pis = [
pi for pi in self.submobject_family()
if isinstance(pi, PiCreature)
]
random.seed(self.random_seed)
for pi in reversed(internal_pis):
color = random.choice(self.colors)
pi.set_color(color)
pi.set_stroke(color, width=0)
def set_style_data(self,
stroke_color=None,
stroke_width=None,
fill_color=None,
fill_opacity=None,
family=True):
# Unchangable style, except for fill_opacity
VMobject.set_style_data(self,
stroke_color=BLACK,
stroke_width=0,
fill_color=BLACK,
fill_opacity=fill_opacity)
return self
def __init__(self, number, **kwargs):
VMobject.__init__(self, **kwargs)
self.number = number
self.initial_config = kwargs
if isinstance(number, complex):
formatter = self.get_complex_formatter()
else:
formatter = self.get_formatter()
num_string = formatter.format(number)
if num_string.startswith("-") and number == 0:
num_string = num_string[1:]
self.add(*[
SingleStringTexMobject(char, **kwargs)
for char in num_string
])
# Add non-numerical bits
if self.show_ellipsis:
self.add(SingleStringTexMobject("\\dots"))
if num_string.startswith("-"):
minus = self.submobjects[0]
minus.next_to(
self.submobjects[1], LEFT,
buff=self.digit_to_digit_buff
)
if self.unit is not None:
self.unit_sign = SingleStringTexMobject(self.unit, color=self.color)
self.add(self.unit_sign)
self.arrange_submobjects(
buff=self.digit_to_digit_buff,
aligned_edge=DOWN
)
# Handle alignment of parts that should be aligned
# to the bottom
for i, c in enumerate(num_string):
if c == "-" and len(num_string) > i + 1:
self[i].align_to(self[i + 1], alignment_vect=UP)
elif c == ",":
self[i].shift(self[i].get_height() * DOWN / 2)
if self.unit and self.unit.startswith("^"):
self.unit_sign.align_to(self, UP)
#
if self.include_background_rectangle:
self.add_background_rectangle()
def __init__(self, obj, text, brace_direction=DOWN, **kwargs):
VMobject.__init__(self, **kwargs)
self.brace_direction = brace_direction
if isinstance(obj, list):
obj = VMobject(*obj)
self.brace = Brace(obj, brace_direction, **kwargs)
if isinstance(text, tuple) or isinstance(text, list):
self.label = self.label_constructor(*text, **kwargs)
else:
self.label = self.label_constructor(str(text))
if self.label_scale != 1:
self.label.scale(self.label_scale)
self.brace.put_at_tip(self.label)
self.submobjects = [self.brace, self.label]
def shift_brace(self, obj, **kwargs):
if isinstance(obj, list):
obj = VMobject(*obj)
self.brace = Brace(obj, self.brace_direction, **kwargs)
self.brace.put_at_tip(self.label)
self.submobjects[0] = self.brace
return self
def use_to_mobjects(self, use_element):
# Remove initial "#" character
ref = use_element.getAttribute("xlink:href")[1:]
if ref not in self.ref_to_element:
warnings.warn("%s not recognized" % ref)
return VMobject()
return self.get_mobjects_from(
self.ref_to_element[ref]
)
def __init__(self, matrix, **kwargs):
"""
Matrix can either either include numbres, tex_strings,
or mobjects
"""
VMobject.__init__(self, **kwargs)
matrix = np.array(matrix, ndmin=1)
mob_matrix = self.matrix_to_mob_matrix(matrix)
self.organize_mob_matrix(mob_matrix)
self.elements = VGroup(*mob_matrix.flatten())
self.add(self.elements)
self.add_brackets()
self.center()
self.mob_matrix = mob_matrix
if self.add_background_rectangles_to_entries:
for mob in self.elements:
mob.add_background_rectangle()
if self.include_background_rectangle:
self.add_background_rectangle()
def add_pupil_light_spot(self, pupils):
# Purely an artifact of how the SVGs were drawn.
# In a perfect world, this wouldn't be needed
for pupil in pupils:
index = 16
sub_points = pupil.points[:index]
pupil.points = pupil.points[index + 2:]
circle = VMobject()
circle.points = sub_points
circle.set_stroke(width=0)
circle.set_fill(WHITE, 1)
pupil.add(circle)
def get_det_text(matrix,
determinant=None,
background_rect=True,
initial_scale_factor=2):
parens = TexMobject(["(", ")"])
parens.scale(initial_scale_factor)
parens.stretch_to_fit_height(matrix.get_height())
l_paren, r_paren = parens.split()
l_paren.next_to(matrix, LEFT, buff=0.1)
r_paren.next_to(matrix, RIGHT, buff=0.1)
det = TextMobject("det")
det.scale(initial_scale_factor)
det.next_to(l_paren, LEFT, buff=0.1)
if background_rect:
det.add_background_rectangle()
det_text = VMobject(det, l_paren, r_paren)
if determinant is not None:
eq = TexMobject("=")
eq.next_to(r_paren, RIGHT, buff=0.1)
result = TexMobject(str(determinant))
result.next_to(eq, RIGHT, buff=0.2)
det_text.add(eq, result)
return det_text
def generate_points(self):
self.add(self.source_point)
self.lighthouse = Lighthouse()
self.ambient_light = AmbientLight(
source_point=VectorizedPoint(location=self.get_source_point()),
color=self.color,
num_levels=self.num_levels,
radius=self.radius,
opacity_function=self.opacity_function,
max_opacity=self.max_opacity_ambient)
if self.has_screen():
self.spotlight = Spotlight(
source_point=VectorizedPoint(location=self.get_source_point()),
color=self.color,
num_levels=self.num_levels,
radius=self.radius,
screen=self.screen,
opacity_function=self.opacity_function,
max_opacity=self.max_opacity_spotlight,
camera_mob=self.camera_mob)
else:
self.spotlight = Spotlight()
self.shadow = VMobject(fill_color=SHADOW_COLOR,
fill_opacity=1.0,
stroke_color=BLACK)
self.lighthouse.next_to(self.get_source_point(), DOWN, buff=0)
self.ambient_light.move_source_to(self.get_source_point())
if self.has_screen():
self.spotlight.move_source_to(self.get_source_point())
self.update_shadow()
self.add(self.ambient_light, self.spotlight, self.lighthouse,
self.shadow)
def generate_points(self):
if self.x_radius is None:
center_to_edge = (FRAME_X_RADIUS + abs(self.center_point[0]))
self.x_radius = center_to_edge / self.x_unit_size
if self.y_radius is None:
center_to_edge = (FRAME_Y_RADIUS + abs(self.center_point[1]))
self.y_radius = center_to_edge / self.y_unit_size
self.axes = VMobject()
self.main_lines = VMobject()
self.secondary_lines = VMobject()
tuples = [
(self.x_radius, self.x_line_frequency, self.y_radius * DOWN,
self.y_radius * UP, RIGHT),
(
self.y_radius,
self.y_line_frequency,
self.x_radius * LEFT,
self.x_radius * RIGHT,
UP,
),
]
for radius, freq, start, end, unit in tuples:
main_range = np.arange(0, radius, freq)
step = freq / float(freq + self.secondary_line_ratio)
for v in np.arange(0, radius, step):
line1 = Line(start + v * unit, end + v * unit)
line2 = Line(start - v * unit, end - v * unit)
if v == 0:
self.axes.add(line1)
elif v in main_range:
self.main_lines.add(line1, line2)
else:
self.secondary_lines.add(line1, line2)
self.add(self.secondary_lines, self.main_lines, self.axes)
self.stretch(self.x_unit_size, 0)
self.stretch(self.y_unit_size, 1)
self.shift(self.center_point)
# Put x_axis before y_axis
y_axis, x_axis = self.axes.split()
self.axes = VMobject(x_axis, y_axis)
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_mobjects_from(self, element):
result = []
if not isinstance(element, minidom.Element):
return result
if element.tagName == 'defs':
self.update_ref_to_element(element)
elif element.tagName == 'style':
pass # TODO, handle style
elif element.tagName in ['g', 'svg']:
result += it.chain(*[
self.get_mobjects_from(child)
for child in element.childNodes
])
elif element.tagName == 'path':
result.append(self.path_string_to_mobject(
element.getAttribute('d')
))
elif element.tagName == 'use':
result += self.use_to_mobjects(element)
elif element.tagName == 'rect':
result.append(self.rect_to_mobject(element))
elif element.tagName == 'circle':
result.append(self.circle_to_mobject(element))
elif element.tagName == 'ellipse':
result.append(self.ellipse_to_mobject(element))
elif element.tagName in ['polygon', 'polyline']:
result.append(self.polygon_to_mobject(element))
else:
pass # TODO
# warnings.warn("Unknown element type: " + element.tagName)
result = [m for m in result if m is not None]
self.handle_transforms(element, VMobject(*result))
if len(result) > 1 and not self.unpack_groups:
result = [VGroup(*result)]
return result
def __init__(self, mobject, **kwargs):
VMobject.__init__(self, **kwargs)
self.mobject = mobject
self.submobjects = self.get_eyes().submobjects
class LightSource(VMobject):
# combines:
# a lighthouse
# an ambient light
# a spotlight
# and a shadow
CONFIG = {
"source_point":
VectorizedPoint(location=ORIGIN, stroke_width=0, fill_opacity=0),
"color":
LIGHT_COLOR,
"num_levels":
10,
"radius":
10.0,
"screen":
None,
"opacity_function":
inverse_quadratic(1, 2, 1),
"max_opacity_ambient":
AMBIENT_FULL,
"max_opacity_spotlight":
SPOTLIGHT_FULL,
"camera_mob":
None
}
def generate_points(self):
self.add(self.source_point)
self.lighthouse = Lighthouse()
self.ambient_light = AmbientLight(
source_point=VectorizedPoint(location=self.get_source_point()),
color=self.color,
num_levels=self.num_levels,
radius=self.radius,
opacity_function=self.opacity_function,
max_opacity=self.max_opacity_ambient)
if self.has_screen():
self.spotlight = Spotlight(
source_point=VectorizedPoint(location=self.get_source_point()),
color=self.color,
num_levels=self.num_levels,
radius=self.radius,
screen=self.screen,
opacity_function=self.opacity_function,
max_opacity=self.max_opacity_spotlight,
camera_mob=self.camera_mob)
else:
self.spotlight = Spotlight()
self.shadow = VMobject(fill_color=SHADOW_COLOR,
fill_opacity=1.0,
stroke_color=BLACK)
self.lighthouse.next_to(self.get_source_point(), DOWN, buff=0)
self.ambient_light.move_source_to(self.get_source_point())
if self.has_screen():
self.spotlight.move_source_to(self.get_source_point())
self.update_shadow()
self.add(self.ambient_light, self.spotlight, self.lighthouse,
self.shadow)
def has_screen(self):
if self.screen is None:
return False
elif np.size(self.screen.points) == 0:
return False
else:
return True
def dim_ambient(self):
self.set_max_opacity_ambient(AMBIENT_DIMMED)
def set_max_opacity_ambient(self, new_opacity):
self.max_opacity_ambient = new_opacity
self.ambient_light.dimming(new_opacity)
def dim_spotlight(self):
self.set_max_opacity_spotlight(SPOTLIGHT_DIMMED)
def set_max_opacity_spotlight(self, new_opacity):
self.max_opacity_spotlight = new_opacity
self.spotlight.dimming(new_opacity)
def set_camera_mob(self, new_cam_mob):
self.camera_mob = new_cam_mob
self.spotlight.camera_mob = new_cam_mob
def set_screen(self, new_screen):
if self.has_screen():
self.spotlight.screen = new_screen
else:
# Note: See below
index = self.submobjects.index(self.spotlight)
camera_mob = self.spotlight.camera_mob
self.remove(self.spotlight)
self.spotlight = Spotlight(
source_point=VectorizedPoint(location=self.get_source_point()),
color=self.color,
num_levels=self.num_levels,
radius=self.radius,
screen=new_screen,
camera_mob=self.camera_mob,
opacity_function=self.opacity_function,
max_opacity=self.max_opacity_spotlight,
)
self.spotlight.move_source_to(self.get_source_point())
# Note: This line will make spotlight show up at the end
# of the submojects list, which can make it show up on
# top of the shadow. To make it show up in the
# same spot, you could try the following line,
# where "index" is what I defined above:
self.submobjects.insert(index, self.spotlight)
# self.add(self.spotlight)
# in any case
self.screen = new_screen
def move_source_to(self, point):
apoint = np.array(point)
v = apoint - self.get_source_point()
# Note: As discussed, things stand to behave better if source
# point is a submobject, so that it automatically interpolates
# during an animation, and other updates can be defined wrt
# that source point's location
self.source_point.set_location(apoint)
# self.lighthouse.next_to(apoint,DOWN,buff = 0)
# self.ambient_light.move_source_to(apoint)
self.lighthouse.shift(v)
# self.ambient_light.shift(v)
self.ambient_light.move_source_to(apoint)
if self.has_screen():
self.spotlight.move_source_to(apoint)
self.update()
return self
def change_spotlight_opacity_function(self, new_of):
self.spotlight.change_opacity_function(new_of)
def set_radius(self, new_radius):
self.radius = new_radius
self.ambient_light.radius = new_radius
self.spotlight.radius = new_radius
def update(self):
self.update_lighthouse()
self.update_ambient()
self.spotlight.update_sectors()
self.update_shadow()
def update_lighthouse(self):
self.lighthouse.move_to(self.get_source_point())
# new_lh = Lighthouse()
# new_lh.move_to(ORIGIN)
# new_lh.apply_matrix(self.rotation_matrix())
# new_lh.shift(self.get_source_point())
# self.lighthouse.submobjects = new_lh.submobjects
def update_ambient(self):
new_ambient_light = AmbientLight(
source_point=VectorizedPoint(location=ORIGIN),
color=self.color,
num_levels=self.num_levels,
radius=self.radius,
opacity_function=self.opacity_function,
max_opacity=self.max_opacity_ambient)
new_ambient_light.apply_matrix(self.rotation_matrix())
new_ambient_light.move_source_to(self.get_source_point())
self.ambient_light.submobjects = new_ambient_light.submobjects
def get_source_point(self):
return self.source_point.get_location()
def rotation_matrix(self):
if self.camera_mob is None:
return np.eye(3)
phi = self.camera_mob.get_center()[0]
theta = self.camera_mob.get_center()[1]
R1 = np.array([[1, 0, 0], [0, np.cos(phi), -np.sin(phi)],
[0, np.sin(phi), np.cos(phi)]])
R2 = np.array([[np.cos(theta + TAU / 4), -np.sin(theta + TAU / 4), 0],
[np.sin(theta + TAU / 4),
np.cos(theta + TAU / 4), 0], [0, 0, 1]])
R = np.dot(R2, R1)
return R
def update_shadow(self):
point = self.get_source_point()
projected_screen_points = []
if not self.has_screen():
return
for point in self.screen.get_anchors():
projected_screen_points.append(self.spotlight.project(point))
projected_source = project_along_vector(
self.get_source_point(), self.spotlight.projection_direction())
projected_point_cloud_3d = np.append(projected_screen_points,
np.reshape(
projected_source, (1, 3)),
axis=0)
# z_to_vector(self.spotlight.projection_direction())
rotation_matrix = self.rotation_matrix()
back_rotation_matrix = rotation_matrix.T # i. e. its inverse
rotated_point_cloud_3d = np.dot(projected_point_cloud_3d,
back_rotation_matrix.T)
# these points now should all have z = 0
point_cloud_2d = rotated_point_cloud_3d[:, :2]
# now we can compute the convex hull
hull_2d = ConvexHull(point_cloud_2d) # guaranteed to run ccw
hull = []
# we also need the projected source point
source_point_2d = np.dot(
self.spotlight.project(self.get_source_point()),
back_rotation_matrix.T)[:2]
index = 0
for point in point_cloud_2d[hull_2d.vertices]:
if np.all(np.abs(point - source_point_2d) < 1.0e-6):
source_index = index
index += 1
continue
point_3d = np.array([point[0], point[1], 0])
hull.append(point_3d)
index += 1
hull_mobject = VMobject()
hull_mobject.set_points_as_corners(hull)
hull_mobject.apply_matrix(rotation_matrix)
anchors = hull_mobject.get_anchors()
# add two control points for the outer cone
if np.size(anchors) == 0:
self.shadow.points = []
return
ray1 = anchors[source_index - 1] - projected_source
ray1 = ray1 / get_norm(ray1) * 100
ray2 = anchors[source_index] - projected_source
ray2 = ray2 / get_norm(ray2) * 100
outpoint1 = anchors[source_index - 1] + ray1
outpoint2 = anchors[source_index] + ray2
new_anchors = anchors[:source_index]
new_anchors = np.append(new_anchors,
np.array([outpoint1, outpoint2]),
axis=0)
new_anchors = np.append(new_anchors, anchors[source_index:], axis=0)
self.shadow.set_points_as_corners(new_anchors)
# shift it closer to the camera so it is in front of the spotlight
self.shadow.mark_paths_closed = True
def init_colors(self):
VMobject.init_colors(self)
self.set_color_by_gradient(*self.colors)
def init_colors(self):
VMobject.init_colors(self)
self.set_color_by_gradient(*self.colors)
for order in sorted(self.order_to_stroke_width_map.keys()):
if self.order >= order:
self.set_stroke(width=self.order_to_stroke_width_map[order])
def __init__(self, path_string, **kwargs):
digest_locals(self)
VMobject.__init__(self, **kwargs)
def __init__(self, **kwargs):
digest_config(self, kwargs, locals())
self.ensure_valid_file()
VMobject.__init__(self, **kwargs)
self.move_into_position()
def get_center(self):
result = VMobject.get_center(self)
if hasattr(self, "center_offset"):
result -= self.center_offset
return result
def clear(self):
self.add_content(VMobject())
return self
def __init__(self, **kwargs):
VMobject.__init__(self, **kwargs)
self.add_iris_back()
self.add_spikes()
self.add_pupil()
def update_shadow(self):
point = self.get_source_point()
projected_screen_points = []
if not self.has_screen():
return
for point in self.screen.get_anchors():
projected_screen_points.append(self.spotlight.project(point))
projected_source = project_along_vector(
self.get_source_point(), self.spotlight.projection_direction())
projected_point_cloud_3d = np.append(projected_screen_points,
np.reshape(
projected_source, (1, 3)),
axis=0)
# z_to_vector(self.spotlight.projection_direction())
rotation_matrix = self.rotation_matrix()
back_rotation_matrix = rotation_matrix.T # i. e. its inverse
rotated_point_cloud_3d = np.dot(projected_point_cloud_3d,
back_rotation_matrix.T)
# these points now should all have z = 0
point_cloud_2d = rotated_point_cloud_3d[:, :2]
# now we can compute the convex hull
hull_2d = ConvexHull(point_cloud_2d) # guaranteed to run ccw
hull = []
# we also need the projected source point
source_point_2d = np.dot(
self.spotlight.project(self.get_source_point()),
back_rotation_matrix.T)[:2]
index = 0
for point in point_cloud_2d[hull_2d.vertices]:
if np.all(np.abs(point - source_point_2d) < 1.0e-6):
source_index = index
index += 1
continue
point_3d = np.array([point[0], point[1], 0])
hull.append(point_3d)
index += 1
hull_mobject = VMobject()
hull_mobject.set_points_as_corners(hull)
hull_mobject.apply_matrix(rotation_matrix)
anchors = hull_mobject.get_anchors()
# add two control points for the outer cone
if np.size(anchors) == 0:
self.shadow.points = []
return
ray1 = anchors[source_index - 1] - projected_source
ray1 = ray1 / get_norm(ray1) * 100
ray2 = anchors[source_index] - projected_source
ray2 = ray2 / get_norm(ray2) * 100
outpoint1 = anchors[source_index - 1] + ray1
outpoint2 = anchors[source_index] + ray2
new_anchors = anchors[:source_index]
new_anchors = np.append(new_anchors,
np.array([outpoint1, outpoint2]),
axis=0)
new_anchors = np.append(new_anchors, anchors[source_index:], axis=0)
self.shadow.set_points_as_corners(new_anchors)
# shift it closer to the camera so it is in front of the spotlight
self.shadow.mark_paths_closed = True
def __init__(self, function, **kwargs):
self.function = function
VMobject.__init__(self, **kwargs)
class NumberPlane(VMobject):
CONFIG = {
"color": BLUE_D,
"secondary_color": BLUE_E,
"axes_color": WHITE,
"secondary_stroke_width": 1,
# TODO: Allow coordinate center of NumberPlane to not be at (0, 0)
"x_radius": None,
"y_radius": None,
"x_unit_size": 1,
"y_unit_size": 1,
"center_point": ORIGIN,
"x_line_frequency": 1,
"y_line_frequency": 1,
"secondary_line_ratio": 1,
"written_coordinate_height": 0.2,
"propagate_style_to_family": False,
"make_smooth_after_applying_functions": True,
}
def generate_points(self):
if self.x_radius is None:
center_to_edge = (FRAME_X_RADIUS + abs(self.center_point[0]))
self.x_radius = center_to_edge / self.x_unit_size
if self.y_radius is None:
center_to_edge = (FRAME_Y_RADIUS + abs(self.center_point[1]))
self.y_radius = center_to_edge / self.y_unit_size
self.axes = VMobject()
self.main_lines = VMobject()
self.secondary_lines = VMobject()
tuples = [
(self.x_radius, self.x_line_frequency, self.y_radius * DOWN,
self.y_radius * UP, RIGHT),
(
self.y_radius,
self.y_line_frequency,
self.x_radius * LEFT,
self.x_radius * RIGHT,
UP,
),
]
for radius, freq, start, end, unit in tuples:
main_range = np.arange(0, radius, freq)
step = freq / float(freq + self.secondary_line_ratio)
for v in np.arange(0, radius, step):
line1 = Line(start + v * unit, end + v * unit)
line2 = Line(start - v * unit, end - v * unit)
if v == 0:
self.axes.add(line1)
elif v in main_range:
self.main_lines.add(line1, line2)
else:
self.secondary_lines.add(line1, line2)
self.add(self.secondary_lines, self.main_lines, self.axes)
self.stretch(self.x_unit_size, 0)
self.stretch(self.y_unit_size, 1)
self.shift(self.center_point)
# Put x_axis before y_axis
y_axis, x_axis = self.axes.split()
self.axes = VMobject(x_axis, y_axis)
def init_colors(self):
VMobject.init_colors(self)
self.axes.set_stroke(self.axes_color, self.stroke_width)
self.main_lines.set_stroke(self.color, self.stroke_width)
self.secondary_lines.set_stroke(self.secondary_color,
self.secondary_stroke_width)
return self
def get_center_point(self):
return self.coords_to_point(0, 0)
def coords_to_point(self, x, y):
x, y = np.array([x, y])
result = self.axes.get_center()
result += x * self.get_x_unit_size() * RIGHT
result += y * self.get_y_unit_size() * UP
return result
def point_to_coords(self, point):
new_point = point - self.axes.get_center()
x = new_point[0] / self.get_x_unit_size()
y = new_point[1] / self.get_y_unit_size()
return x, y
# Does not recompute center, unit_sizes for each call; useful for
# iterating over large lists of points, but does assume these
# attributes are kept accurate. (Could alternatively have a method
# which returns a function dynamically created after a single
# call to each of get_center(), get_x_unit_size(), etc.)
def point_to_coords_cheap(self, point):
new_point = point - self.center_point
x = new_point[0] / self.x_unit_size
y = new_point[1] / self.y_unit_size
return x, y
def get_x_unit_size(self):
return self.axes.get_width() / (2.0 * self.x_radius)
def get_y_unit_size(self):
return self.axes.get_height() / (2.0 * self.y_radius)
def get_coordinate_labels(self, x_vals=None, y_vals=None):
coordinate_labels = VGroup()
if x_vals is None:
x_vals = list(range(-int(self.x_radius), int(self.x_radius) + 1))
if y_vals is None:
y_vals = list(range(-int(self.y_radius), int(self.y_radius) + 1))
for index, vals in enumerate([x_vals, y_vals]):
num_pair = [0, 0]
for val in vals:
if val == 0:
continue
num_pair[index] = val
point = self.coords_to_point(*num_pair)
num = TexMobject(str(val))
num.add_background_rectangle()
num.set_height(self.written_coordinate_height)
num.next_to(point, DOWN + LEFT, buff=SMALL_BUFF)
coordinate_labels.add(num)
self.coordinate_labels = coordinate_labels
return coordinate_labels
def get_axes(self):
return self.axes
def get_axis_labels(self, x_label="x", y_label="y"):
x_axis, y_axis = self.get_axes().split()
quads = [
(x_axis, x_label, UP, RIGHT),
(y_axis, y_label, RIGHT, UP),
]
labels = VGroup()
for axis, tex, vect, edge in quads:
label = TexMobject(tex)
label.add_background_rectangle()
label.next_to(axis, vect)
label.to_edge(edge)
labels.add(label)
self.axis_labels = labels
return labels
def add_coordinates(self, x_vals=None, y_vals=None):
self.add(*self.get_coordinate_labels(x_vals, y_vals))
return self
def get_vector(self, coords, **kwargs):
point = coords[0] * RIGHT + coords[1] * UP
arrow = Arrow(ORIGIN, point, **kwargs)
return arrow
def prepare_for_nonlinear_transform(self, num_inserted_anchor_points=50):
for mob in self.family_members_with_points():
num_anchors = mob.get_num_anchor_points()
if num_inserted_anchor_points > num_anchors:
mob.insert_n_anchor_points(num_inserted_anchor_points -
num_anchors)
mob.make_smooth()
return self
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 g_to_mobjects(self, g_element):
mob = VMobject(*self.get_mobjects_from(g_element))
self.handle_transforms(g_element, mob)
return mob.submobjects
