constructor(first, second) {

    this.anchor = first;

    this.t = second.copy();

    this.ray = [];

  }

​

  cast() {

    this.ray.push(this.anchor);

    this.ray.push(this.t);

    while (

      this.t.x < width &&

      this.t.x > 0 &&

      this.t.y < height/2 &&

      this.t.y > 0

    ) {

      let min_d = Infinity;

      let d = 0;

      for (let i = 0; i < shapes.length; ++i) {

        let d = shapes[i].distance(this.t);

        if (d < min_d) min_d = d;

      }

      if (min_d < Epsilon) {

        return dist(this.anchor.x, this.anchor.y, this.t.x, this.t.y);

      }

​

      let s = this.t.copy();

      s.sub(this.anchor);

      let angle = s.heading();

      let next_t = createVector(min_d, 0);

      next_t.setHeading(angle);

      next_t.add(this.t);

      this.t = next_t;

      this.ray.push(this.t);

    }

    return Infinity;

  }

​

  show() {

    noFill();

    beginShape();

    for (let i = 0; i < this.ray.length; ++i) {

      vertex(this.ray[i].x, this.ray[i].y);

      noFill();

    }

    endShape();

  }

}

​