@thi.ng/boids/behaviors/separation.js

n-dimensional boids simulation with modular behavior system

import { __ensureFn } from "../internal/ensure.js";
const separation = (minDist, weight = 1, amp = () => 1) => {
  const $minDist = __ensureFn(minDist);
  const force = [];
  const delta = [];
  return {
    weight: __ensureFn(weight),
    update: (boid) => {
      const { maddN, magSq, setN, sub } = boid.api;
      const pos = boid.pos.curr;
      const neighbors = boid.neighbors($minDist(boid), pos);
      const num = neighbors.length;
      let n;
      setN(force, 0);
      for (let i = 0; i < num; i++) {
        n = neighbors[i];
        if (n !== boid) {
          sub(delta, pos, n.pos.curr);
          maddN(
            force,
            delta,
            amp(boid, n) / (magSq(delta) + 1e-6),
            force
          );
        }
      }
      return boid.averageForce(force, num - 1);
    }
  };
};
export {
  separation
};