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Class: Broadcast

Defined in: src/animation/utility/index.ts:296

Broadcast animation that creates copies of the mobject which scale up and fade out, matching Python manim's Broadcast behavior.

Each copy starts at the focal point with initialWidth and initialOpacity, then animates to the original mobject's width and finalOpacity with staggered timing via lagRatio.

Extends​

Constructors​

Constructor​

new Broadcast(mobject, options): Broadcast

Defined in: src/animation/utility/index.ts:327

Parameters​

mobject​

Mobject

options​

BroadcastOptions = {}

Returns​

Broadcast

Overrides​

Animation.constructor

Properties​

_hasBegun​

protected _hasBegun: boolean = false

Defined in: src/animation/Animation.ts:49

Track if begin() has been called

Inherited from​

Animation._hasBegun

_isFinished​

protected _isFinished: boolean = false

Defined in: src/animation/Animation.ts:46

Whether the animation has finished

Inherited from​

Animation._isFinished

_startTime​

protected _startTime: number = null

Defined in: src/animation/Animation.ts:43

Time when the animation started (set by Timeline)

Inherited from​

Animation._startTime

duration​

readonly duration: number

Defined in: src/animation/Animation.ts:37

Duration of the animation in seconds

Inherited from​

Animation.duration

finalOpacity​

readonly finalOpacity: number

Defined in: src/animation/utility/index.ts:307

Ending opacity

focalPoint​

readonly focalPoint: [number, number, number]

Defined in: src/animation/utility/index.ts:298

Center of the broadcast effect

initialOpacity​

readonly initialOpacity: number

Defined in: src/animation/utility/index.ts:304

Starting opacity

initialWidth​

readonly initialWidth: number

Defined in: src/animation/utility/index.ts:310

Starting width of copies

lagRatio​

readonly lagRatio: number

Defined in: src/animation/utility/index.ts:313

Lag ratio between copies

mobject​

readonly mobject: Mobject

Defined in: src/animation/Animation.ts:34

The mobject being animated

Inherited from​

Animation.mobject

nMobs​

readonly nMobs: number

Defined in: src/animation/utility/index.ts:301

Number of copies

rateFunc​

readonly rateFunc: RateFunction

Defined in: src/animation/Animation.ts:40

Rate function controlling the animation's pacing

Inherited from​

Animation.rateFunc

remover​

remover: boolean = false

Defined in: src/animation/Animation.ts:55

If true, the scene will remove this mobject after the animation finishes. Used by FadeOut (like Python manim's remover=True).

Inherited from​

Animation.remover

Accessors​

startTime​

Get Signature​

get startTime(): number

Defined in: src/animation/Animation.ts:236

Get the start time of this animation (set by Timeline)

Returns​

number

Set Signature​

set startTime(time): void

Defined in: src/animation/Animation.ts:243

Set the start time of this animation (used by Timeline)

Parameters​
time​

number

Returns​

void

Inherited from​

Animation.startTime

Methods​

begin()​

begin(): void

Defined in: src/animation/utility/index.ts:340

Called when the animation starts. Subclasses can override to set up initial state. On the very first call, captures a snapshot of the mobject so that reset() can restore it for clean backward seeking.

Returns​

void

Overrides​

Animation.begin

cleanUpFromScene()​

cleanUpFromScene(scene): void

Defined in: src/animation/Animation.ts:141

Hook called by Scene after the animation finishes, before the next play(). Default: removes mobject if remover is set (FadeOut, Write({remover:true})). Override for animations that need to mutate scene membership — e.g. ReplacementTransform swaps source for target.

Parameters​

scene​

AnimationScene

Returns​

void

Inherited from​

Animation.cleanUpFromScene

finish()​

finish(): void

Defined in: src/animation/utility/index.ts:419

Called when the animation ends. Subclasses can override to clean up or finalize state.

Returns​

void

Overrides​

Animation.finish

getSubAlpha()​

protected getSubAlpha(alpha, index, count, lagRatio): number

Defined in: src/animation/Animation.ts:161

Manim CE's get_sub_alpha: remaps a global progress alpha into the local progress of family member index (of count) under a lagRatio stagger. With lagRatio <= 0 (or a single member), every member tracks alpha directly. Subclasses that stagger across a mobject's family (e.g. Create) should index this by familyMembersWithPoints(), never by rendering-layer primitives.

Parameters​

alpha​

number

index​

number

count​

number

lagRatio​

number

Returns​

number

Inherited from​

Animation.getSubAlpha

interpolate()​

interpolate(alpha): void

Defined in: src/animation/utility/index.ts:376

Apply the animation at a given progress value.

Parameters​

alpha​

number

Progress from 0 (start) to 1 (end)

Returns​

void

Overrides​

Animation.interpolate

isFinished()​

isFinished(): boolean

Defined in: src/animation/Animation.ts:197

Check if the animation has finished

Returns​

boolean

Inherited from​

Animation.isFinished

reset()​

reset(): void

Defined in: src/animation/Animation.ts:206

Reset the animation to its initial state. Restores the mobject to its pre-animation visual state so that re-seeking (especially backward) produces correct results.

Returns​

void

Inherited from​

Animation.reset

update()​

update(_dt, currentTime): void

Defined in: src/animation/Animation.ts:174

Update the animation for the current frame.

Parameters​

_dt​

number

Time delta since last frame (unused, but available for subclasses)

currentTime​

number

Current time in the timeline

Returns​

void

Inherited from​

Animation.update