constructor(x,y) {

    super(x, y);

    this.tried = false;

  }  

}

​

function allOptions() {

  return [

    new Step( 1,  0),

    new Step(-1,  0),

    new Step( 0,  1),

    new Step( 0, -1),

    new Step( 1,  1),

    new Step( -1, -1),

    new Step( 1,  -1),

    new Step( -1, 1),

  ];

}

​

​

class Spot {

  constructor(i, j) {

    this.i = i;

    this.j = j;

    this.pos = createVector(i*spacing, j*spacing);

    this.options = allOptions();

    this.visited = false;

  }

  clear() {

    this.visited = false;

    this.options = allOptions();

  }

​

  nextSpot() {

    let validOptions = [];

    for (let option of this.options) {

      let newX = this.i + option.x;

      let newY = this.j + option.y;

      if (isValid(newX, newY) && !option.tried) {

        validOptions.push(option);

      }

    }

​

    if (validOptions.length > 0) {

      let step = random(validOptions);

      step.tried = true;

      return grid[this.i+step.x][this.j+step.y];

    }

    return undefined;

  }

}