Press n or j to go to the next uncovered block, b, p or k for the previous block.
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* Copyright (c) 2022-2023 Braun Nathanael
*
* This project is dual licensed under one of the following licenses:
* - Creative Commons Attribution-NoDerivatives 4.0 International License.
* - GNU AFFERO GENERAL PUBLIC LICENSE Version 3
*
* You should have received a copy of theses licenses along with this work.
* If not, see <http://creativecommons.org/licenses/by-nd/4.0/> or <http://www.gnu.org/licenses/agpl-3.0.txt>.
*/
/**
* Inertia — physics-based momentum engine for scrollable axes.
*
* Tracks drag velocity during a hold gesture, then on release computes a deceleration
* arc using an easing function (default: easePolyOut). If waypoints are configured,
* `_doSnap()` selects the nearest one and adjusts the target position and duration
* so the animation lands exactly on a waypoint.
*
* The settle easing is configurable via the `settle` option:
* settle: "easeCubicOut" — any d3-ease function name
* settle: fn — custom normalised easing function
* settle: { stiffness, damping, mass } — physical spring: the curve is generated
* at release time from the actual gesture velocity & travel distance (closed-form
* damped oscillator — see utils/spring.js), giving velocity continuity and an
* overshoot/bounce while the predictive waypoint snap stays authoritative.
* Individual waypoints may override it: wayPoints: [{ at: 100, settle: {...} }] —
* the elected waypoint's `settle` wins over the axis-level one.
*
* The `reducedMotion` option (injected by Tweener) is a callback; when it returns
* true at release time the settle duration collapses to 1ms so the axis jumps
* straight to the predicted snap target — all callbacks (willSnap/onSnap/onStop)
* still fire normally.
*
* The engine is poll-based: callers invoke `update()` on each timer tick (every 16ms
* via `applyInertia()` in Tweener) to retrieve the current position. The engine does
* not schedule its own timers.
*
* Three-phase drag lifecycle:
* startMove() — begins a new gesture; resets velocity state
* hold(pos) — called on each pointer-move event; accumulates velocity
* release() — called on pointer-up; commits momentum and triggers snap
*/
const
is = require('is'),
easingFn = require('d3-ease'),
{ springSettle } = require('./spring'),
signOf = function sign( x ) {
return typeof x === 'number' ? x ? x < 0 ? -1 : 1 : x === x ? x : NaN : NaN;
},
abs = Math.abs,
floor = Math.floor,
round = Math.round,
min = Math.min,
max = Math.max,
floatCut = ( v = 0 ) => v.toFixed(3),
consts = {
velocityResetTm: .150,
clickTm : 250
};
/**
* Resolve the static part of a `settle` option into an easing function.
*
* - string → looked up in d3-ease (e.g. "easeCubicOut"); warns & falls back if unknown
* - function → used as-is
* - object → spring config; resolved per-release in `_applySettleSpring()` (returns null here)
*/
function resolveSettleEase( settle ) {
if ( !settle )
return null;
if ( is.fn(settle) )
return settle;
if ( is.string(settle) ) {
if ( easingFn[settle] )
return easingFn[settle];
console.warn("[react-voodoo] Inertia: unknown settle easing '", settle, "' — falling back to easePolyOut");
return null;
}
return null;
}
/**
* Compute the momentum distance and duration from the current drag velocity.
*
* Uses a geometric series with decay factor 0.9 per frame:
* loopsTarget = log(0.05 / |v|) / log(0.9)
* This gives the number of 16ms steps until velocity decays below 5% of its current
* value. The sum of the geometric series (loopsVelSum) gives total distance travelled.
*
* When disabled (inertia.disabled), all targets are zeroed so the axis stops immediately.
*/
export function applyInertia( _ ) {
let velSign = signOf(_.lastVelocity);
if ( _.disabled ) {
_.loopsTarget = 0;
_.loopsVelSum = 0;
_.targetDist = 0;
_.targetDuration = 0;
}
else {
// calc momentum distance...
// get nb loop needed to get vel < .05
_.loopsTarget = floor(Math.log(.05 / abs(_.lastVelocity)) / Math.log(.9));
// get velocity sum basing on nb loops needed
_.loopsVelSum = (Math.pow(.9, _.loopsTarget) - abs(_.lastVelocity)) / (.9 - 1);
// deduce real dist of momentum
_.targetDist = (_.loopsVelSum * _.refFPS * velSign) / 1000 || 0;
_.targetDuration = abs(_.loopsTarget * _.refFPS * velSign) || 0;
//console.warn(" _.targetDist", _.targetDist, _.lastVelocity);
}
}
/**
* Main inertia class
* @type {module.exports}
*/
export default class Inertia {
static config = {
bounds : true,
snapToBounds: true
};
constructor( opt ) {
let _ = this._ = {};
_.conf = {
...this.constructor.config,
...opt
};
this.active = false;
_.pos = opt.value || 0;
_.refFPS = 16;
_.min = opt.min || 0;
_.max = opt.max || 0;
_.currentStop = 0;
_.lastInertiaPos = 0;
_.stops = _.conf.stops;
_.disabled = _.conf.disabled;
_.wayPoints = _.conf.wayPoints;
_.inertiaFn = resolveSettleEase(_.conf.settle) || easingFn.easePolyOut;
_.targetWayPointIndex = 0;
this._detectCurrentSnap();
}
updateConf( opt ) {
let _ = this._;
_.min = opt.min || 0;
_.max = opt.max || 0;
_.stops = opt.stops;
_.disabled = opt.disabled;
_.wayPoints = opt.wayPoints;
_.conf.willStop = opt.willStop;
_.conf.willSnap = opt.willSnap;
_.conf.onStop = opt.onStop;
_.conf.onSnap = opt.onSnap;
_.conf.shouldLoop = opt.shouldLoop;
_.conf.settle = opt.settle;
_.inertiaFn = resolveSettleEase(opt.settle) || easingFn.easePolyOut;
}
/**
* Begin a new drag gesture. Resets all velocity and momentum state so the
* release() calculation starts from a clean baseline. Sets `holding = true`
* to keep the inertia loop running while the pointer is held down.
*/
startMove() {
let _ = this._;
_.baseTS = _.startTS = Date.now() / 1000;
_.lastVelocity = _.lastIVelocity = 0;
_.lastAccel = 0;
_.posDiff = 0;
_.loopsDiff = 0;
this.active = true;
this.holding = true;
_.inertia = false;
}
/**
* Called on each pointer-move event with the new axis position. Updates the
* running velocity estimate used by release() to compute momentum distance.
*
* Velocity direction change detection: if the pointer reverses direction and
* more than `velocityResetTm` (150ms) has elapsed since the last base-point,
* the velocity base is reset to the current position/time. This prevents a
* brief reversal near the end of a fast swipe from zeroing out accumulated
* momentum. The `velocityResetTm` guard makes the direction check "sticky"
* enough to ignore micro-jitter from touch digitizers.
*/
hold( nextPos ) {
let _ = this._,
delta = _.lastHoldPos !== undefined ? nextPos - _.lastHoldPos : 0,
loop,
now = Date.now() / 1000,
sinceLastPos = (now - _.baseTS),
pos = nextPos,
iVel = delta / sinceLastPos;
_.lastHoldPos = nextPos;
//if (is.nan(pos))
// debugger
if ( !_.lastBaseTs ) {// create base pts
_.lastBasePos = nextPos;
_.lastBaseTs = _.baseTS;
}
if ( sinceLastPos < .003 ) {
//console.log("hold fast", delta, _.baseTS, sinceLastPos);
// skip/ignore
}
else Iif (// direction changed for velocityResetTm
(
(iVel <= 0 && _.lastVelocity > 0)
||
(iVel >= 0 && _.lastVelocity < 0)
||
abs(iVel) < abs(_.lastVelocity * 0.2)
) &&
(now - _.lastBaseTs) > consts.velocityResetTm
) {
//console.log("reset", _.lastBaseTs, _.lastVelocity);
_.lastBasePos = nextPos;
_.lastBaseTs = now;
_.lastVelocity = 0;
_.lastIVelocity = 0;
_.baseTS = now;
_.targetDist = 0;
_.lastInertiaPos = 0;
}
else Iif (// dir changed fast
(iVel <= 0 && _.lastVelocity > 0)
||
(iVel >= 0 && _.lastVelocity < 0)
||
abs(iVel) < abs(_.lastVelocity * 0.2)
) {
//ignore
}
else {
_.lastIVelocity = iVel;
_.lastVelocity = ((pos) - (_.lastBasePos)) / (now - _.lastBaseTs);
_.baseTS = now;
_.targetDist = 0;
_.lastInertiaPos = 0;
// clear snap
_.targetWayPoint = undefined;
_.targetWayPointIndex = undefined;
}
Eif ( _.conf.bounds ) {
Iif ( pos > _.max ) {
pos = _.max// + min((pos - _.max) / 10, 10);
}
else Iif ( pos < _.min ) {
pos = _.min// - min((_.min - pos) / 10, 10);
}
}
Iif ( _.conf.shouldLoop ) {
while ( (loop = _.conf.shouldLoop(pos, delta)) ) {
pos += loop;
}
}
_.pos = pos;
}
/**
* Called when the pointer is released. Commits the accumulated velocity into a
* momentum arc via `applyInertia()`, then applies snapToBounds correction if the
* projected landing position is outside [min, max]. Finally calls `_doSnap()` to
* find the nearest waypoint and adjust the target accordingly.
*/
release() {
let _ = this._,
velSign = signOf(_.lastVelocity);
this.holding = false;
// Compute momentum distance/duration from the last measured velocity.
applyInertia(_);
_.lastHoldPos = undefined;
_.lastBasePos = undefined;
_.lastBaseTs = undefined;
_.holding = false;
//if ( _.conf.shouldLoop ) {
// let loop, nPos=_.pos + _.targetDist;
// while ( (loop = _.conf.shouldLoop(nPos, 0)) ) {
// nPos += loop;
// if ( _.inertia ) {
// //_.targetDist+=loop;
// //_.lastInertiaPos+=loop;
// }
// //this.teleport(loop);
// }
// if (nPos!==_.pos + _.targetDist)
//}
Eif ( _.conf.bounds && _.conf.snapToBounds ) {
if ( (_.pos + _.targetDist) > _.max ) {
_.targetDist = _.max - _.pos;
_.targetDuration = abs(_.targetDist * 10);
}
else Iif ( (_.pos + _.targetDist) < _.min ) {
_.targetDist = _.min - _.pos;
_.targetDuration = abs(_.targetDist * 10);
}
}
//else {
if ( !_.targetDuration )
_.targetDuration = 50;
//console.log(_);
this.active = true;
_.inertia = true;
_.lastInertiaPos = 0;
_.settleLoopDec = 0;
_.inertiaStartTm =
_.inertiaLastTm = Date.now();
//}
this._doSnap(null, 500)
this._applySettleSpring(_.lastVelocity);
if ( _.conf.reducedMotion?.() )
_.targetDuration = 1;// jump: the next update tick lands exactly on the snap target
_.conf.willEnd?.(_.targetDist + _.pos, _.targetDist, _.targetDuration);
}
/**
* Resolve & apply the settle easing for the starting inertia animation.
*
* The effective `settle` value is the elected waypoint's own `settle` field if
* defined ({ at, gravity, settle }), falling back to the axis-level config —
* so individual waypoints can have their own landing feel.
*
* When the value is a spring config ({ stiffness, damping, mass, restDelta }),
* the settle easing is generated from the closed-form damped-spring solution
* using the *actual* release velocity and travel distance, and the duration is
* derived from the spring's physical settle time.
*
* Called after _doSnap() so the snap target (waypoint, gravity, maxJump) stays
* authoritative — the spring only decides *how* the axis travels there, with
* velocity continuity and a possible overshoot/bounce.
*/
_applySettleSpring( velocity = 0 ) {
let _ = this._,
s = _.targetWayPoint && _.targetWayPoint.settle !== undefined
? _.targetWayPoint.settle
: _.conf.settle;
// resolve the static part (string/fn — or restore the default when the
// previous settle came from a waypoint-specific config)
_.inertiaFn = resolveSettleEase(s) || easingFn.easePolyOut;
_.settleCustom = !!s;// activates the loop guard in update()
if ( !s || is.fn(s) || is.string(s) || !_.targetDist )
return;
let { ease, duration } = springSettle(velocity / _.targetDist, s),
clamped = max(50, min(10000, duration));
// if clamped, remap so the curve is still evaluated on its physical time base
_.inertiaFn = clamped === duration ? ease : u => ease(u * clamped / duration);
_.targetDuration = clamped;
}
/**
* Poll-based position update — called every 16ms by Tweener.applyInertia().
*
* Applies the easing function to the elapsed time ratio to get a smoothed
* position delta, then accumulates it into `_.pos`. When the animation
* duration has elapsed, snaps exactly to the target waypoint position (if any)
* to eliminate floating-point drift, fires onStop/onSnap callbacks, and sets
* `active = false` to stop the 16ms loop.
*/
update( at = Date.now() ) {
let _ = this._, nextValue, loop;
let
pos = _.inertiaFn((at - _.inertiaStartTm) / _.targetDuration) * _.targetDist;
if ( !_.inertia ) {
//if ( _.conf.shouldLoop ) {
// while ( (loop = _.conf.shouldLoop(_.pos, 0)) ) {
// this.teleport(loop);
// }
//}
return _.pos;
}
let
delta = pos - _.lastInertiaPos;
_.lastInertiaPos = pos;
if ( (at - _.inertiaStartTm) >= _.targetDuration ) {
_.inertia = this.active = false;
_.lastInertiaPos = delta = 0;
_.targetDist = 0;
Eif ( _.targetWayPoint ) {
delta = _.targetWayPoint.at - _.pos;
//console.log("snap done ", _.targetWayPoint, _.pos + delta);
_.currentWayPoint = _.targetWayPoint;
_.currentWayPointIndex = _.targetWayPointIndex;
_.targetWayPoint = null;
_.targetWayPointIndex = null;
//_.lastSnapTm = Date.now();
}
if ( _.conf.onStop ) {
_.conf.onStop(_.pos, _.currentWayPoint)
}
if ( _.conf.onSnap ) {
_.conf.onSnap(_.currentWayPointIndex, _.currentWayPoint)
}
}
delta = delta || 0;
//console.log(_.pos + delta);
nextValue = _.pos + delta;
Iif ( _.conf.shouldLoop ) {
// With an overshooting settle easing (spring), the position may briefly cross
// a loop threshold before bouncing back to the target waypoint. _doSnap() has
// already accounted the expected loop shifts (snapLoopDec) in the travel
// distance — allow exactly those, and suppress extra teleports caused by the
// overshoot so the final exact-snap (targetWayPoint.at) stays consistent.
// Only active when a custom `settle` is configured (default path unchanged).
let snapGuard = _.settleCustom && _.inertia && _.targetWayPoint;
while ( (!snapGuard || _.settleLoopDec !== _.snapLoopDec) && (loop = _.conf.shouldLoop(nextValue, delta)) ) {
//console.warn("loop update", loop, nextValue);
nextValue += loop;
if ( snapGuard )
_.settleLoopDec += loop;
if ( _.inertia ) {
//_.targetDist+=loop;
//_.lastInertiaPos+=loop;
}
//this.teleport(loop);
}
}
_.pos = nextValue;
return nextValue;
}
setPos( pos ) {
let _ = this._, nextValue;
_.inertia = false;
this.active = false;
_.lastInertiaPos = 0;
_.targetDist = 0;
_.inertiaStartTm = 0;
_.inertiaLastTm = 0;
_.targetDuration = 0;
if ( _.conf.shouldLoop ) {
let loop, nextValue = pos;
while ( (loop = _.conf.shouldLoop(nextValue, _.pos - pos)) ) {
nextValue += loop;
//this.teleport(loop);
//console.warn("loop update", nextValue, pos);
}
pos = nextValue;
}
_.pos = pos;
if ( _.conf.bounds ) {
_.pos = max(_.pos, _.min);
_.pos = min(_.pos, _.max);
}
}
setWayPoints( wayPoints ) {
let _ = this._, nextValue;
_.wayPoints = wayPoints;
this._detectCurrentSnap();
}
teleport( loopDist ) {
let _ = this._, nextValue;
if ( !_.inertia )
return _.pos += loopDist;
//_.lastInertiaPos += loopDist;
_.pos += loopDist
//console.log("setPos", _.lastInertiaPos);
}
/**
* Programmatic momentum injection — e.g. for button-triggered scroll or swipe
* animations without a preceding drag gesture. If an inertia animation is already
* running in the same direction, the delta is accumulated; if the direction
* changes the animation is restarted from the current position.
*/
dispatch( delta, tm = 500 ) {
let _ = this._,
now = Date.now(),
pos;
this.active = true;
// if no inertia has started || if direction has change
if ( !_.inertia || signOf(delta) !== signOf(_.targetDist) ) {
_.inertia = true;
_.lastInertiaPos = 0;
_.settleLoopDec = 0;
_.inertiaStartTm =
_.inertiaLastTm = now;
_.targetDist = delta;
_.targetDuration = tm;
}
else E{
//_.inertiaStartTm =
//_.inertiaLastTm = now;
//_.lastInertiaPos = 0;
_.targetDist += delta;
_.targetDuration += tm / 2;
}
//
//if ( _.conf.maxJump ) {
//
//}
Eif ( _.conf.bounds ) {
Iif ( (_.pos + _.targetDist) > _.max ) {
_.targetDist = _.max - _.pos;
_.targetDuration = abs(_.targetDist * 10);
}
else Iif ( (_.pos + _.targetDist) < _.min ) {
_.targetDist = _.min - _.pos;
_.targetDuration = abs(_.targetDist * 10);
}
}
this._doSnap(signOf(delta), 750)
this._applySettleSpring(0);// programmatic momentum: spring starts from rest
Eif ( _.conf.reducedMotion?.() )
_.targetDuration = 1;
}
_detectCurrentSnap() {
let _ = this._,
pos = _.pos,
i;
if ( _.wayPoints && _.wayPoints.length ) {
for ( i = 0; i < _.wayPoints.length; i++ )
Eif ( floatCut(_.wayPoints[i].at) === floatCut(pos) ) {
_.currentWayPoint = _.wayPoints[i];
_.currentWayPointIndex = i;
//console.warn("snap set", i);
return i;
}
}
}
/**
* Select the waypoint that best matches the projected landing position and
* adjust `_.targetDist` and `_.targetDuration` to land precisely on it.
*
* Waypoint selection:
* Binary-search the sorted wayPoints array for the first waypoint beyond `pos`.
* The midpoint between adjacent waypoints `i-1` and `i` (weighted by their
* `gravity` fields, default 1) determines which waypoint "wins". If `forceSnap`
* is set (from dispatch()), the direction overrides the midpoint check.
* `maxJump` caps the maximum index distance from the current waypoint to
* prevent the animation from skipping multiple slides in one gesture.
*/
_doSnap( forceSnap, maxDuration = 2000 ) {
let _ = this._,
pos = _.targetDist + (_.pos - (_.lastInertiaPos || 0)),
lPos = pos,
loopDec = 0,
target,
mid,
i,
loop;
if ( _.wayPoints && _.wayPoints.length ) {
// apply loops to do to find the final wayPoint
Iif ( _.conf.shouldLoop ) {
while ( (loop = _.conf.shouldLoop(lPos, 0)) ) {
lPos += loop;
loopDec += loop;
}
}
for ( i = 0; i < _.wayPoints.length; i++ )
if ( _.wayPoints[i].at > lPos )
break;
if ( i === _.wayPoints.length ) {
i--
}
else Iif ( i === 0 ) {
i = 0;
}
else {
mid = (_.wayPoints[i].at - _.wayPoints[i - 1].at) / 2;
mid = _.wayPoints[i - 1].at + (mid * ((_.wayPoints[i].gravity || 1) / (_.wayPoints[i - 1].gravity || 1)));
if ( forceSnap ) forceSnap < 0 && i--;
else Eif ( lPos < mid ) i--;
}
Iif ( _.conf.maxJump && is.number(_.currentWayPointIndex) ) {
let d = (i - _.currentWayPointIndex);
//console.log('Inertia::_doSnap:154: ', i, d);
if ( abs(d) > _.conf.maxJump ) {
//console.log('max: ', i, d);
i = _.currentWayPointIndex + signOf(d) * _.conf.maxJump;
}
}
target = _.wayPoints[i].at;
if ( _.conf.willSnap ) {
_.conf.willSnap(i, _.wayPoints[i]);
}
_.lastInertiaPos = _.lastInertiaPos || 0;
target = target - (_.pos - _.lastInertiaPos) - loopDec;
_.targetDuration = max(50, min(maxDuration, abs((_.targetDuration / _.targetDist) * target))) || 0;
//console.log("do snap", i, target, loopDec);
_.targetDist = target;
_.targetWayPoint = _.wayPoints[i];
_.targetWayPointIndex = i;
_.snapLoopDec = loopDec;// loop shifts expected during the settle (see update())
}
else {
_.snapLoopDec = 0;
target = ~~(_.pos - _.lastInertiaPos);
Eif ( !_.conf.infinite ) {
Iif ( target > _.max ) {
target = _.max - target;
_.targetDuration = min(maxDuration, abs((_.targetDuration / _.targetDist) * target));
_.targetDist = target;
}
else Iif ( target < _.min ) {
target = _.min - target;
_.targetDuration = min(maxDuration, abs((_.targetDuration / _.targetDist) * target));
_.targetDist = target;
}
}
}
}
setBounds( min, max ) {
let _ = this._;
//console.log('Inertia::setBounds:245: ', min, max);
_.min = min;
_.max = max;
}
isInbound( nextPos ) {
let _ = this._, loop,
delta = _.lastHoldPos !== undefined ? nextPos - _.lastHoldPos : 0,
pos = (_.targetDist || 0) + (_.pos - (_.lastInertiaPos || 0)) + delta;
//if ( _.conf.infinite ) return false;
//
//if ( _.conf.shouldLoop ) {
// while ( (loop = _.conf.shouldLoop(nextValue)) ) {
//!(pos >= _.min && pos <= _.max) && console.warn("out", _.pos, pos, delta);
// pos += loop;
// }
//}
return pos >= _.min && pos <= _.max;
}
}
|