def fade_to(self, color, alpha, family=True):
if self.get_num_points() > 0:
new_color = interpolate_color(self.get_color(), color, alpha)
self.set_color(new_color, family=False)
if family:
for submob in self.submobjects:
submob.fade_to(color, alpha)
return self
def fade_to(self, color, alpha, family=True):
if self.get_num_points() > 0:
new_color = interpolate_color(
self.get_color(), color, alpha
)
self.set_color(new_color, family=False)
if family:
for submob in self.submobjects:
submob.fade_to(color, alpha)
return self
def set_submobject_colors_by_radial_gradient(self, center=None, radius=1, inner_color=WHITE, outer_color=BLACK):
if center is None:
center = self.get_center()
for mob in self.family_members_with_points():
t = get_norm(mob.get_center() - center) / radius
t = min(t, 1)
mob_color = interpolate_color(inner_color, outer_color, t)
mob.set_color(mob_color, family=False)
return self
def set_submobject_colors_by_radial_gradient(self, center=None, radius=1, inner_color=WHITE, outer_color=BLACK):
if center is None:
center = self.get_center()
for mob in self.family_members_with_points():
t = get_norm(mob.get_center() - center) / radius
t = min(t, 1)
mob_color = interpolate_color(inner_color, outer_color, t)
mob.set_color(mob_color, family=False)
return self
def return_updater(mob, alpha):
dx = interpolate(-PI / 2, PI / 2, alpha)
mob.become(mob.init_state)
mob.set_width(rectangle_width * np.cos(dx), stretch=True)
# dx should not be zero
sign = -abs(dx) / (dx + 0.00000000001)
direction = LEFT * sign
reference_line = Line(
rectangle.init_state.get_corner(UP + direction),
rectangle.init_state.get_corner(DOWN + direction))
mob.next_to(reference_line, -direction, buff=0)
opacity = self.init_opacity + (self.max_opacity -
self.init_opacity) * np.cos(dx)
mob.set_style(fill_opacity=opacity)
mob.set_color(
interpolate_color(self.rectangle_kwargs["color"], midle_color,
np.cos(dx)))
