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SpringOptions,
PhysicsSpringOptions,
Animation,
AnimationState,
} from "../types"
import { calcAngularFreq, findSpring } from "../utils/find-spring"
const durationKeys = ["duration", "bounce"]
const physicsKeys = ["stiffness", "damping", "mass"]
function isSpringType(options: SpringOptions, keys: string[]) {
return keys.some((key) => (options as any)[key] !== undefined)
}
function getSpringOptions(
options: SpringOptions
): PhysicsSpringOptions & { isResolvedFromDuration: boolean } {
let springOptions = {
velocity: 0.0,
stiffness: 100,
damping: 10,
mass: 1.0,
isResolvedFromDuration: false,
...options,
}
// stiffness/damping/mass overrides duration/bounce
if (
!isSpringType(options, physicsKeys) &&
isSpringType(options, durationKeys)
) {
const derived = findSpring(options)
springOptions = {
...springOptions,
...derived,
velocity: 0.0,
mass: 1.0,
}
springOptions.isResolvedFromDuration = true
}
return springOptions
}
/**
* This is based on the spring implementation of Wobble https://github.com/skevy/wobble
*/
export function spring({
from = 0.0,
to = 1.0,
restSpeed = 2,
restDelta,
...options
}: SpringOptions): Animation<number> {
/**
* This is the Iterator-spec return value. We ensure it's mutable rather than using a generator
* to reduce GC during animation.
*/
const state: AnimationState<number> = { done: false, value: from }
let {
stiffness,
damping,
mass,
velocity,
isResolvedFromDuration,
} = getSpringOptions(options)
let resolveSpring = zero
let resolveVelocity = zero
function createSpring() {
const initialVelocity = velocity ? -(velocity / 1000) : 0.0
const initialDelta = to - from
const dampingRatio = damping / (2 * Math.sqrt(stiffness * mass))
const undampedAngularFreq = Math.sqrt(stiffness / mass) / 1000
/**
* If we're working within what looks like a 0-1 range, change the default restDelta
* to 0.01
*/
restDelta ??= Math.abs(to - from) <= 1 ? 0.01 : 0.4
if (dampingRatio < 1) {
const angularFreq = calcAngularFreq(
undampedAngularFreq,
dampingRatio
)
// Underdamped spring
resolveSpring = (t: number) => {
const envelope = Math.exp(
-dampingRatio * undampedAngularFreq * t
)
return (
to -
envelope *
(((initialVelocity +
dampingRatio * undampedAngularFreq * initialDelta) /
angularFreq) *
Math.sin(angularFreq * t) +
initialDelta * Math.cos(angularFreq * t))
)
}
resolveVelocity = (t: number) => {
// TODO Resolve these calculations with the above
const envelope = Math.exp(
-dampingRatio * undampedAngularFreq * t
)
return (
dampingRatio *
undampedAngularFreq *
envelope *
((Math.sin(angularFreq * t) *
(initialVelocity +
dampingRatio *
undampedAngularFreq *
initialDelta)) /
angularFreq +
initialDelta * Math.cos(angularFreq * t)) -
envelope *
(Math.cos(angularFreq * t) *
(initialVelocity +
dampingRatio *
undampedAngularFreq *
initialDelta) -
angularFreq *
initialDelta *
Math.sin(angularFreq * t))
)
}
} else if (dampingRatio === 1) {
// Critically damped spring
resolveSpring = (t: number) =>
to -
Math.exp(-undampedAngularFreq * t) *
(initialDelta +
(initialVelocity + undampedAngularFreq * initialDelta) *
t)
} else {
// Overdamped spring
const dampedAngularFreq =
undampedAngularFreq * Math.sqrt(dampingRatio * dampingRatio - 1)
resolveSpring = (t: number) => {
const envelope = Math.exp(
-dampingRatio * undampedAngularFreq * t
)
// When performing sinh or cosh values can hit Infinity so we cap them here
const freqForT = Math.min(dampedAngularFreq * t, 300)
return (
to -
(envelope *
((initialVelocity +
dampingRatio * undampedAngularFreq * initialDelta) *
Math.sinh(freqForT) +
dampedAngularFreq *
initialDelta *
Math.cosh(freqForT))) /
dampedAngularFreq
)
}
}
}
createSpring()
return {
next: (t: number) => {
const current = resolveSpring(t)
if (!isResolvedFromDuration) {
const currentVelocity = resolveVelocity(t) * 1000
const isBelowVelocityThreshold =
Math.abs(currentVelocity) <= restSpeed
const isBelowDisplacementThreshold =
Math.abs(to - current) <= restDelta
state.done =
isBelowVelocityThreshold && isBelowDisplacementThreshold
} else {
state.done = t >= options.duration
}
state.value = state.done ? to : current
return state
},
flipTarget: () => {
velocity = -velocity
;[from, to] = [to, from]
createSpring()
},
}
}
spring.needsInterpolation = (a: any, b: any) =>
typeof a === "string" || typeof b === "string"
const zero = (_t: number) => 0
|