4230-hw-1/BivariateFunction/vec3.js

// BetterVector3.js
// John Breaux  2022-07-28
// Craptastic 3D Vector library

"use strict";


class vec3 {
   constructor(x = 0, y = 0, z = 0) {
      this.x = x;
      this.y = y;
      this.z = z;
   }

   add(rhs) {
      return new vec3(this.x + rhs.x, this.y + rhs.y, this.z + rhs.z);
   }
   sub(rhs) {
      return new vec3(this.x - rhs.x, this.y - rhs.y, this.z - rhs.z);
   }
   dot(rhs) {
      return this.x * rhs.x + this.y * rhs.y + this.z * rhs.z;
   }
   cross(rhs) {
      return new vec3(
         this.y * rhs.z - this.z * rhs.y,
         this.z * rhs.x - this.x * rhs.z,
         this.x * rhs.y - this.y * rhs.x
      );
   }

   magnitude() {
      return Math.sqrt(this.x * this.x + this.y * this.y + this.z * this.z);
   }

   normal() {
      var m = this.magnitude();
      if (m === 0) { return null };
      return new vec3(
         this.x / m,
         this.y / m,
         this.z / m
      );
   }
   normalize() {
      var m = this.magnitude();
      if (m === 0) { return null };
      this.x /= m;
      this.y /= m;
      this.z /= m;
      return this;
   }

   // copy
   copy() {
      return new vec3(this.x, this.y, this.z);
   }
   // to array
   a() {
      return [this.x, this.y, this.z];
   }
   // to String
   toString() {
      return `{${this.x}, ${this.y}, ${this.z}}`
   }
}