AnimatedBoundary

Qualified name: algan.animations.changing.AnimatedBoundary

class AnimatedBoundary(vmobject, colors=(Color([0.1608, 0.6706, 0.7922, 0.0000, 1.0000]), Color([0.6118, 0.8627, 0.9216, 0.0000, 1.0000]), Color([0.1373, 0.4196, 0.5569, 0.0000, 1.0000]), Color([0.4510, 0.3882, 0.3412, 0.0000, 1.0000])), max_stroke_width=3, cycle_rate=0.5, back_and_forth=True, draw_easing=<function smooth>, fade_easing=<function smooth>, **kwargs)

Bases: Group

A cycling highlight that repeatedly travels around a Bezier Mob.

This is one of the few Manim animation helpers that is not reduced to a simple Algan context composition: it is an indefinite, absolute-time updater which keeps following the source Mob even while the source changes shape.

Parameters mirror Manim Community’s AnimatedBoundary where practical. The returned object is an ordinary Algan Group; call spawn() to display it and stop() to freeze the updater.

Methods

stop	Remove the boundary updater, leaving its current appearance fixed.

Attributes

animation_manager	This mob's scene-owned animation manager.
basis	The Mob's orientation and scale, as a flattened 3x3 matrix of shape (*, 9).
casts_shadows	Whether this Mob's geometry blocks light on its way from a light source to another surface -- whether it casts a shadow.
children	The Mobs attached below this one, in attachment order.
closed_shell	Whether this Mob's triangles form a CLOSED shell -- every camera ray that enters the geometry crosses a second time on its way out.
draws_descendants	Whether get_render_primitives returns geometry belonging to this Mob's DESCENDANTS as well as its own.
forward	Get the direction the Mob is facing.
lifespan	This mob's [spawn, despawn) interval on its Scene timeline (a Lifespan).
location	The Mob's position in world space, shape (*, 3).
normalized_basis	The Mob's orientation with scale divided out, shape (*, 9).
parents	The Mobs this one is attached to, in attachment order.
receives_shadows	Whether this Mob's surfaces are darkened by shadows cast onto them.
right	Get the Mob's own rightward direction.
scale_coefficient	The Mob's scale along its own right, up and forward axes, shape (*, 3).
two_sided	Whether this Mob's geometry should be lit from whichever side the ray arrives on.
up	Get the Mob's own upward direction.
x	The Mob's x coordinate in world units, shape (*, 1).
xy	The Mob's x and y coordinates in world units, shape (*, 2).
y	The Mob's y coordinate in world units, shape (*, 1).
z	The Mob's z coordinate in world units, shape (*, 1).

Parameters:

• vmobject (Mob)

• colors (Sequence)

• max_stroke_width (float)

• cycle_rate (float)

• back_and_forth (bool)

stop()

Remove the boundary updater, leaving its current appearance fixed.