ujs/src/js/objects.js

class Object {
  constructor(x, y, w, h) {
    this.x = x;
    this.y = y;
    this.width = w;
    this.height = h;
  }
}

export class Rect extends Object {
  constructor(x, y, w, h, fillColor = 'white') {
    super(x, y, w, h);

    this.fillColor = fillColor;
  }
}

export class StrokeRect extends Rect {
  constructor(x, y, w, h, fillColor = 'white', strokeColor = 'black', strokeWidth = 1) {
    super(x, y, w, h, fillColor);

    this.strokeWidth = strokeWidth;
    this.strokeColor = strokeColor;
  }
}