@thi.ng/geom-arc/bounds.js

2D circular / elliptic arc operations

import { HALF_PI } from "@thi.ng/math/api";
import { inRange } from "@thi.ng/math/interval";
import { roundTo } from "@thi.ng/math/prec";
import {
  MAX2,
  MIN2
} from "@thi.ng/vectors/api";
import { max2 } from "@thi.ng/vectors/max";
import { min2 } from "@thi.ng/vectors/min";
import { set2 } from "@thi.ng/vectors/set";
import { pointAtTheta } from "./point-at.js";
const bounds = (pos, r, axis, start, end) => {
  const min = set2([], MAX2);
  const max = set2([], MIN2);
  const p = [];
  const update = (theta) => {
    pointAtTheta(pos, r, axis, theta, p);
    min2(null, min, p);
    max2(null, max, p);
  };
  update(start);
  update(end);
  if (start > end) {
    const t = start;
    start = end;
    end = t;
  }
  for (let i = roundTo(start, HALF_PI), j = roundTo(end, HALF_PI); i < j; i += HALF_PI) {
    inRange(i, start, end) && update(i);
  }
  return [min, max];
};
export {
  bounds
};