text: class Boundary 
  {
    constructor(x1, y1, x2, y2) 
    {
      this.a = new p5.Vector(x1, y1);
      this.b = new p5.Vector(x2, y2);
      this.color = color(255, 255, 255);
    }
  
    get length()
    {
      const x = this.a.x - this.b.x;
      const y = this.a.y - this.b.y;
      return sqrt(x*x + y*y);
    }
  
    render = () => 
    {
      stroke(this.color);
      line(this.a.x, this.a.y, this.b.x, this.b.y);
    };
  }
  