@thi.ng/vectors/bisect.js

Optimized 2d/3d/4d and arbitrary length vector operations, support for memory mapping/layouts

import { HALF_PI, PI } from "@thi.ng/math/api";
import { addmN } from "./addmn.js";
import { direction2 } from "./direction.js";
import { headingXY } from "./heading.js";
import { mixN2 } from "./mixn.js";
import { normalize, normalize2 } from "./normalize.js";
import { perpendicularCCW } from "./perpendicular.js";
import { sub } from "./sub.js";
const bisect2 = (a, b) => {
  const theta = (headingXY(a) + headingXY(b)) / 2;
  return theta <= HALF_PI ? theta : PI - theta;
};
const cornerBisector = (out, a, b, c, n = 1) => {
  !out && (out = []);
  return normalize(
    out,
    addmN(
      out,
      normalize(out, sub(out, a, b)),
      normalize(null, sub([], c, b)),
      0.5
    ),
    n
  );
};
const cornerBisector2 = (out, a, b, c, n = 1) => {
  !out && (out = []);
  return perpendicularCCW(
    out,
    normalize2(
      out,
      mixN2(out, direction2(out, a, b), direction2([], b, c), 0.5),
      n
    )
  );
};
export {
  bisect2,
  cornerBisector,
  cornerBisector2
};