constructor(x, y) {

//     let midPoint = floor(width/size/2);

//     this.x = midPoint;

//     this.y = midPoint;

//     this.margin = 10; 

//     this.dmargin = 1;

    this.x = floor(random(cols)); 

    this.y = floor(random(rows));

    this.margin = 10;

  }

  display(grid) {

    this.x = floor(mouseX / size); 

    this.y = floor(mouseY / size);

    for (let i=-this.margin; i<this.margin; i++) {

      for (let j=-this.margin; j<this.margin; j++) {

        let x = this.x + i;

        let y = this.y + j;

        x = constrain(x, 0, cols - 1);

        y = constrain(y, 0, rows - 1);

        if (grid[x][y] == 1) {

          fill(255);

        } else {

          fill(0);

        }

        rect(x*size, y*size, size, size);

      }

    }

    // if (this.margin > floor(width/size/2) || this.margin < 0) {

    //   this.dmargin *= -1;

    // }

    // this.margin += this.dmargin; 

  }

}