@openhps/core/src/three/extras/curves/LineCurve.js

Open Hybrid Positioning System - Core component

"use strict";

Object.defineProperty(exports, "__esModule", {
  value: true
});
exports.LineCurve = void 0;
var _Vector = require("../../math/Vector2.js");
var _Curve = require("../core/Curve.js");
/**
 * A curve representing a 2D line segment.
 *
 * @augments Curve
 */
class LineCurve extends _Curve.Curve {
  /**
   * Constructs a new line curve.
   *
   * @param {Vector2} [v1] - The start point.
   * @param {Vector2} [v2] - The end point.
   */
  constructor(v1 = new _Vector.Vector2(), v2 = new _Vector.Vector2()) {
    super();

    /**
     * This flag can be used for type testing.
     *
     * @type {boolean}
     * @readonly
     * @default true
     */
    this.isLineCurve = true;
    this.type = 'LineCurve';

    /**
     * The start point.
     *
     * @type {Vector2}
     */
    this.v1 = v1;

    /**
     * The end point.
     *
     * @type {Vector2}
     */
    this.v2 = v2;
  }

  /**
   * Returns a point on the line.
   *
   * @param {number} t - A interpolation factor representing a position on the line. Must be in the range `[0,1]`.
   * @param {Vector2} [optionalTarget] - The optional target vector the result is written to.
   * @return {Vector2} The position on the line.
   */
  getPoint(t, optionalTarget = new _Vector.Vector2()) {
    const point = optionalTarget;
    if (t === 1) {
      point.copy(this.v2);
    } else {
      point.copy(this.v2).sub(this.v1);
      point.multiplyScalar(t).add(this.v1);
    }
    return point;
  }

  // Line curve is linear, so we can overwrite default getPointAt
  getPointAt(u, optionalTarget) {
    return this.getPoint(u, optionalTarget);
  }
  getTangent(t, optionalTarget = new _Vector.Vector2()) {
    return optionalTarget.subVectors(this.v2, this.v1).normalize();
  }
  getTangentAt(u, optionalTarget) {
    return this.getTangent(u, optionalTarget);
  }
  copy(source) {
    super.copy(source);
    this.v1.copy(source.v1);
    this.v2.copy(source.v2);
    return this;
  }
  toJSON() {
    const data = super.toJSON();
    data.v1 = this.v1.toArray();
    data.v2 = this.v2.toArray();
    return data;
  }
  fromJSON(json) {
    super.fromJSON(json);
    this.v1.fromArray(json.v1);
    this.v2.fromArray(json.v2);
    return this;
  }
}
exports.LineCurve = LineCurve;