@thi.ng/ramp/group.js

Extensible keyframe interpolation/tweening of arbitrary, nested types

import { unconstrained } from "./domain.js";
import { __samples } from "./utils.js";
const group = (children, opts) => new Group(children, opts);
class Group {
  constructor(children, opts) {
    this.children = children;
    this.childEntries = Object.entries(this.children);
    this.domain = opts?.domain || unconstrained;
  }
  domain;
  childEntries;
  at(t) {
    t = this.domain(t, ...this.timeBounds());
    return this.childEntries.reduce((acc, [id, ramp]) => {
      acc[id] = ramp.at(t);
      return acc;
    }, {});
  }
  samples(n = 100, start, end) {
    return __samples(this, n, start, end);
  }
  bounds() {
    return this.childEntries.reduce(
      (acc, [id, ramp]) => {
        const bounds = ramp.bounds();
        acc.minT = Math.min(acc.minT, bounds.minT);
        acc.maxT = Math.max(acc.maxT, bounds.maxT);
        acc.min[id] = bounds.min;
        acc.max[id] = bounds.max;
        return acc;
      },
      { minT: Infinity, maxT: -Infinity, min: {}, max: {} }
    );
  }
  timeBounds() {
    return this.childEntries.reduce(
      (acc, [_, ramp]) => {
        const bounds = ramp.timeBounds();
        acc[0] = Math.min(acc[0], bounds[0]);
        acc[1] = Math.max(acc[1], bounds[1]);
        return acc;
      },
      [Infinity, -Infinity]
    );
  }
}
export {
  Group,
  group
};