4230-hw-1/Pendulum/Homogeneous2D.js

// Homogeneous2D.js
// John Breaux  2022-07-01
// 2D Homogeneous coordinate library

"use strict";

//
// Classes
//

// Homogeneous2D: Stores a 2d vector or point in homogeneous coords
class Homogeneous2D {
   constructor(x = 0, y = 0, w = 0) {
      this.x = x;
      this.y = y;
      this.w = w;
   }
   // Add with modify
   add_m(rhs) {
      if (rhs) {
         this.x += rhs.x;
         this.y += rhs.y;
         this.w += rhs.w;
         return this;
      }
      else return null;
   }
   // copy
   copy() {
      return new Homogeneous2D(this.x, this.y, this.w);
   }
   // create vector/point from 2d polar coordinates
   from_polar(r = 0, theta = 0, w = 0) {
      this.x = r * Math.cos(theta + Math.PI / 2);
      this.y = r * Math.sin(theta + Math.PI / 2);
      this.w = w;
      return this;
   }
}