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@mapbox/unitbezier

v1.0.0

Published

unit bezier curve interpolation

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Links

Git

Maintainers

mapbox-npm-01mapbox-npm-01mapbox-npm-02mapbox-npm-02mapbox-npm-07mapbox-npm-07mapbox-npm-03mapbox-npm-03mapbox-npm-04mapbox-npm-04mapbox-npm-09mapbox-npm-09mapbox-npm-05mapbox-npm-05mapbox-npm-06mapbox-npm-06mapbox-npm-08mapbox-npm-08mapbox-npm-advanced-actionsmapbox-npm-advanced-actionsmapbox-npm-cimapbox-npm-cimapbox-npmmapbox-npmmapbox-adminmapbox-adminmapbox-machine-usermapbox-machine-usermbx-npm-ci-stagingmbx-npm-ci-stagingmbx-npm-ci-productionmbx-npm-ci-productionmbx-npm-01-productionmbx-npm-01-productionmbx-npm-02-productionmbx-npm-02-productionmbx-npm-03-productionmbx-npm-03-productionmbx-npm-04-productionmbx-npm-04-productionmbx-npm-05-productionmbx-npm-05-productionmbx-npm-06-productionmbx-npm-06-productionmbx-npm-07-productionmbx-npm-07-productionmbx-npm-08-productionmbx-npm-08-productionmbx-npm-09-productionmbx-npm-09-productionmbx-npm-02-stagingmbx-npm-02-stagingmbx-npm-advanced-actions-stagingmbx-npm-advanced-actions-stagingmbx-npm-advanced-actions-productionmbx-npm-advanced-actions-production

Keywords

unitbezierinterpolationwebkit

Readme

Node

unitbezier

Unit bezier interpolation function: a port to JavaScript from Webkit:

http://svn.webkit.org/repository/webkit/trunk/Source/WebCore/platform/graphics/UnitBezier.h

API

import unitBezier from '@mapbox/unitbezier';

const ease = unitBezier(0.25, 0.1, 0.25, 1); // CSS `ease`
ease(0.5);        // → 0.8024…
ease(0.5, 1e-8);  // tighter precision

unitBezier(p1x, p1y, p2x, p2y)

Returns a function that evaluates the cubic bezier curve defined by control points (0,0), (p1x, p1y), (p2x, p2y), (1,1).

ease(x, epsilon?)

Evaluate the curve for x (clamped to [0, 1]). epsilon controls solver precision (default 1e-6).