constructor(x, y, dx, dy){

    this.x = x;

    this.y = y;

    this.dx = dx; 

    this.dy = dy; 

  }

  createCircle(){

    fill(255, 255, 0);

    ellipse(this.x, this.y, 25, 25);

  }

​

  moveCircle(){

    this.x = this.x + this.dx; 

    this.y = this.y + this.dy;

  }

​

  checkBorder(){

    if (this.x > width || this.x < 0){

      this.dx = this.dx*-1; 

    }

    if (this.y > height || this.y < 0){

      this.dy = this.dy*-1;

    }

  }

}

​