constructor (x, y) {

    this.pos = createVector(x, y);

    this.dir = createVector(1,0);

  }

  lookAt(x, y) {

    turir = createVector(x - this.pos.x, y - this.pos.y);

    this.dir.normalize();

  }

 turnTo(deg) {

    let r = radians(deg);    

    this.dir = createVector(cos(r), sin(r));

    this.dir.normalize();

  }

  cast(segment) {

    const x1 = segment.a.x;

    const y1 = segment.a.y;

    const x2 = segment.b.x;

    const y2 = segment.b.y;

    const x3 = this.pos.x;

    const y3 = this.pos.y;

    const x4 = this.pos.x + this.dir.x;

    const y4 = this.pos.y + this.dir.y;

    const denominator = ((x1 - x2)*(y3 - y4) - (y1 - y2)*(x3 - x4));

    if(denominator == 0) { return false; } //lines parallel

    let t =  ((x1 - x3)*(y3 - y4) - (y1 - y3)*(x3 - x4)) / denominator;

    let u = -((x1 - x2)*(y1 - y3) - (y1 - y2)*(x1 - x3)) / denominator;

    if(!(t > 0 && t < 1 && u > 0)) { return false; }

​

    return createVector(

      x3 + u * (x4 - x3),

      y3 + u * (y4 - y3)  

    );

  }

}