three-stdlib/math/Capsule.cjs

stand-alone library of threejs examples

"use strict";
Object.defineProperty(exports, Symbol.toStringTag, { value: "Module" });
const THREE = require("three");
const _v1 = /* @__PURE__ */ new THREE.Vector3();
const _v2 = /* @__PURE__ */ new THREE.Vector3();
const _v3 = /* @__PURE__ */ new THREE.Vector3();
const EPS = 1e-10;
class Capsule {
  constructor(start = new THREE.Vector3(0, 0, 0), end = new THREE.Vector3(0, 1, 0), radius = 1) {
    this.start = start;
    this.end = end;
    this.radius = radius;
  }
  clone() {
    return new Capsule(this.start.clone(), this.end.clone(), this.radius);
  }
  set(start, end, radius) {
    this.start.copy(start);
    this.end.copy(end);
    this.radius = radius;
  }
  copy(capsule) {
    this.start.copy(capsule.start);
    this.end.copy(capsule.end);
    this.radius = capsule.radius;
  }
  getCenter(target) {
    return target.copy(this.end).add(this.start).multiplyScalar(0.5);
  }
  translate(v) {
    this.start.add(v);
    this.end.add(v);
  }
  checkAABBAxis(p1x, p1y, p2x, p2y, minx, maxx, miny, maxy, radius) {
    return (minx - p1x < radius || minx - p2x < radius) && (p1x - maxx < radius || p2x - maxx < radius) && (miny - p1y < radius || miny - p2y < radius) && (p1y - maxy < radius || p2y - maxy < radius);
  }
  intersectsBox(box) {
    return this.checkAABBAxis(
      this.start.x,
      this.start.y,
      this.end.x,
      this.end.y,
      box.min.x,
      box.max.x,
      box.min.y,
      box.max.y,
      this.radius
    ) && this.checkAABBAxis(
      this.start.x,
      this.start.z,
      this.end.x,
      this.end.z,
      box.min.x,
      box.max.x,
      box.min.z,
      box.max.z,
      this.radius
    ) && this.checkAABBAxis(
      this.start.y,
      this.start.z,
      this.end.y,
      this.end.z,
      box.min.y,
      box.max.y,
      box.min.z,
      box.max.z,
      this.radius
    );
  }
  lineLineMinimumPoints(line1, line2) {
    const r = _v1.copy(line1.end).sub(line1.start);
    const s = _v2.copy(line2.end).sub(line2.start);
    const w = _v3.copy(line2.start).sub(line1.start);
    const a = r.dot(s), b = r.dot(r), c = s.dot(s), d = s.dot(w), e = r.dot(w);
    let t1, t2;
    const divisor = b * c - a * a;
    if (Math.abs(divisor) < EPS) {
      const d1 = -d / c;
      const d2 = (a - d) / c;
      if (Math.abs(d1 - 0.5) < Math.abs(d2 - 0.5)) {
        t1 = 0;
        t2 = d1;
      } else {
        t1 = 1;
        t2 = d2;
      }
    } else {
      t1 = (d * a + e * c) / divisor;
      t2 = (t1 * a - d) / c;
    }
    t2 = Math.max(0, Math.min(1, t2));
    t1 = Math.max(0, Math.min(1, t1));
    const point1 = r.multiplyScalar(t1).add(line1.start);
    const point2 = s.multiplyScalar(t2).add(line2.start);
    return [point1, point2];
  }
}
exports.Capsule = Capsule;
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