function e (e, t, n) {
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return e > t - n && e < t + n
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}
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function t (t, n) {
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return e(t, 0, n)
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}
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export function Decline () { }
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Decline.prototype.x = function (e) {
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return Math.sqrt(e)
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}
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export function Friction (e, t) {
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this._m = e
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this._f = 1e3 * t
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this._startTime = 0
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this._v = 0
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}
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Friction.prototype.setV = function (x, y) {
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const n = Math.pow(Math.pow(x, 2) + Math.pow(y, 2), 0.5)
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this._x_v = x
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this._y_v = y
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this._x_a = -this._f * this._x_v / n
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this._y_a = -this._f * this._y_v / n
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this._t = Math.abs(x / this._x_a) || Math.abs(y / this._y_a)
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this._lastDt = null
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this._startTime = (new Date()).getTime()
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}
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Friction.prototype.setS = function (x, y) {
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this._x_s = x
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this._y_s = y
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}
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Friction.prototype.s = function (t) {
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if (undefined === t) {
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t = ((new Date()).getTime() - this._startTime) / 1e3
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}
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if (t > this._t) {
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t = this._t
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this._lastDt = t
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}
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let x = this._x_v * t + 0.5 * this._x_a * Math.pow(t, 2) + this._x_s
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let y = this._y_v * t + 0.5 * this._y_a * Math.pow(t, 2) + this._y_s
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if ((this._x_a > 0 && x < this._endPositionX) || (this._x_a < 0 && x > this._endPositionX)) {
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x = this._endPositionX
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}
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if ((this._y_a > 0 && y < this._endPositionY) || (this._y_a < 0 && y > this._endPositionY)) {
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y = this._endPositionY
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}
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return {
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x,
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y
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}
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}
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Friction.prototype.ds = function (t) {
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if (undefined === t) {
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t = ((new Date()).getTime() - this._startTime) / 1e3
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}
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if (t > this._t) {
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t = this._t
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}
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return {
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dx: this._x_v + this._x_a * t,
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dy: this._y_v + this._y_a * t
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}
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}
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Friction.prototype.delta = function () {
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return {
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x: -1.5 * Math.pow(this._x_v, 2) / this._x_a || 0,
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y: -1.5 * Math.pow(this._y_v, 2) / this._y_a || 0
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}
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}
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Friction.prototype.dt = function () {
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return -this._x_v / this._x_a
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}
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Friction.prototype.done = function () {
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const t = e(this.s().x, this._endPositionX) || e(this.s().y, this._endPositionY) || this._lastDt === this._t
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this._lastDt = null
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return t
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}
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Friction.prototype.setEnd = function (x, y) {
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this._endPositionX = x
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this._endPositionY = y
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}
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Friction.prototype.reconfigure = function (m, f) {
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this._m = m
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this._f = 1e3 * f
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}
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export function Spring (m, k, c) {
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this._m = m
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this._k = k
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this._c = c
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this._solution = null
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this._endPosition = 0
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this._startTime = 0
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}
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Spring.prototype._solve = function (e, t) {
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const n = this._c
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const i = this._m
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const r = this._k
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const o = n * n - 4 * i * r
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if (o === 0) {
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const a = -n / (2 * i)
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const s = e
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const l = t / (a * e)
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return {
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x: function (e) {
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return (s + l * e) * Math.pow(Math.E, a * e)
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},
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dx: function (e) {
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const t = Math.pow(Math.E, a * e)
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return a * (s + l * e) * t + l * t
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}
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}
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}
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if (o > 0) {
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const c = (-n - Math.sqrt(o)) / (2 * i)
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const u = (-n + Math.sqrt(o)) / (2 * i)
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const d = (t - c * e) / (u - c)
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const h = e - d
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return {
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x: function (e) {
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let t
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let n
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if (e === this._t) {
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t = this._powER1T
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n = this._powER2T
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}
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this._t = e
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if (!t) {
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t = this._powER1T = Math.pow(Math.E, c * e)
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}
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if (!n) {
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n = this._powER2T = Math.pow(Math.E, u * e)
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}
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return h * t + d * n
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},
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dx: function (e) {
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let t
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let n
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if (e === this._t) {
|
t = this._powER1T
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n = this._powER2T
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}
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this._t = e
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if (!t) {
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t = this._powER1T = Math.pow(Math.E, c * e)
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}
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if (!n) {
|
n = this._powER2T = Math.pow(Math.E, u * e)
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}
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return h * c * t + d * u * n
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}
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}
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}
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const p = Math.sqrt(4 * i * r - n * n) / (2 * i)
|
const f = -n / 2 * i
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const v = e
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const g = (t - f * e) / p
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return {
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x: function (e) {
|
return Math.pow(Math.E, f * e) * (v * Math.cos(p * e) + g * Math.sin(p * e))
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},
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dx: function (e) {
|
const t = Math.pow(Math.E, f * e)
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const n = Math.cos(p * e)
|
const i = Math.sin(p * e)
|
return t * (g * p * n - v * p * i) + f * t * (g * i + v * n)
|
}
|
}
|
}
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Spring.prototype.x = function (e) {
|
if (undefined === e) {
|
e = ((new Date()).getTime() - this._startTime) / 1e3
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}
|
return this._solution ? this._endPosition + this._solution.x(e) : 0
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}
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Spring.prototype.dx = function (e) {
|
if (undefined === e) {
|
e = ((new Date()).getTime() - this._startTime) / 1e3
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}
|
return this._solution ? this._solution.dx(e) : 0
|
}
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Spring.prototype.setEnd = function (e, n, i) {
|
if (!i) {
|
i = (new Date()).getTime()
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}
|
if (e !== this._endPosition || !t(n, 0.1)) {
|
n = n || 0
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let r = this._endPosition
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if (this._solution) {
|
if (t(n, 0.1)) {
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n = this._solution.dx((i - this._startTime) / 1e3)
|
}
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r = this._solution.x((i - this._startTime) / 1e3)
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if (t(n, 0.1)) {
|
n = 0
|
}
|
if (t(r, 0.1)) {
|
r = 0
|
}
|
r += this._endPosition
|
}
|
if (!(this._solution && t(r - e, 0.1) && t(n, 0.1))) {
|
this._endPosition = e
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this._solution = this._solve(r - this._endPosition, n)
|
this._startTime = i
|
}
|
}
|
}
|
Spring.prototype.snap = function (e) {
|
this._startTime = (new Date()).getTime()
|
this._endPosition = e
|
this._solution = {
|
x: function () {
|
return 0
|
},
|
dx: function () {
|
return 0
|
}
|
}
|
}
|
Spring.prototype.done = function (n) {
|
if (!n) {
|
n = (new Date()).getTime()
|
}
|
return e(this.x(), this._endPosition, 0.1) && t(this.dx(), 0.1)
|
}
|
Spring.prototype.reconfigure = function (m, t, c) {
|
this._m = m
|
this._k = t
|
this._c = c
|
if (!this.done()) {
|
this._solution = this._solve(this.x() - this._endPosition, this.dx())
|
this._startTime = (new Date()).getTime()
|
}
|
}
|
Spring.prototype.springConstant = function () {
|
return this._k
|
}
|
Spring.prototype.damping = function () {
|
return this._c
|
}
|
Spring.prototype.configuration = function () {
|
function e (e, t) {
|
e.reconfigure(1, t, e.damping())
|
}
|
|
function t (e, t) {
|
e.reconfigure(1, e.springConstant(), t)
|
}
|
return [{
|
label: 'Spring Constant',
|
read: this.springConstant.bind(this),
|
write: e.bind(this, this),
|
min: 100,
|
max: 1e3
|
}, {
|
label: 'Damping',
|
read: this.damping.bind(this),
|
write: t.bind(this, this),
|
min: 1,
|
max: 500
|
}]
|
}
|
|
export function STD (e, t, n) {
|
this._springX = new Spring(e, t, n)
|
this._springY = new Spring(e, t, n)
|
this._springScale = new Spring(e, t, n)
|
this._startTime = 0
|
}
|
STD.prototype.setEnd = function (e, t, n, i) {
|
const r = (new Date()).getTime()
|
this._springX.setEnd(e, i, r)
|
this._springY.setEnd(t, i, r)
|
this._springScale.setEnd(n, i, r)
|
this._startTime = r
|
}
|
STD.prototype.x = function () {
|
const e = ((new Date()).getTime() - this._startTime) / 1e3
|
return {
|
x: this._springX.x(e),
|
y: this._springY.x(e),
|
scale: this._springScale.x(e)
|
}
|
}
|
STD.prototype.done = function () {
|
const e = (new Date()).getTime()
|
return this._springX.done(e) && this._springY.done(e) && this._springScale.done(e)
|
}
|
STD.prototype.reconfigure = function (e, t, n) {
|
this._springX.reconfigure(e, t, n)
|
this._springY.reconfigure(e, t, n)
|
this._springScale.reconfigure(e, t, n)
|
}
|
