constructor() {

    this.r = 100;

    this.x = 50;

    this.y = height - this.r;

    this.vy = 0;

    this.gravity = 3;

  }

​

  jump() {

    if (this.y == height - this.r) {

      this.vy = -35;

    }

  }

​

  hits(train) {

    let x1 = this.x + this.r * 0.5;

    let y1 = this.y + this.r * 0.5;

    let x2 = train.x + train.r * 0.5;

    let y2 = train.y + train.r * 0.5;

    return collideCircleCircle(x1, y1, this.r, x2, y2, train.r);

  }

​

  move() {

    this.y += this.vy;

    this.vy += this.gravity;

    this.y = constrain(this.y, 0, height - this.r);

  }

​

  show() {

    image(uImg, this.x, this.y, this.r, this.r);

​

​

  }

}