Method initializeSnake_

snake-dqn/snake_game.js:226–252

()

  }

  initializeSnake_() {
    /**
     * @private {Array<[number, number]>} Squares currently occupied by the
     * snake.
     *
     * Each element is a length-2 array representing the [y, x] coordinates of
     * the square. The array is ordered such that the first element is the
     * head of the snake and the last one is the tail.
     */
    this.snakeSquares_ = [];

    // Currently, the snake will start from a completely-straight and
    // horizontally-posed state.
    const y = getRandomInteger(0, this.height_);
    let x = getRandomInteger(this.initLen_ - 1, this.width_);
    for (let i = 0; i < this.initLen_; ++i) {
      this.snakeSquares_.push([y, x - i]);
    }

    /**
     * Current snake direction {'l' | 'u' | 'r' | 'd'}.
     *
     * Currently, the snake will start from a completely-straight and
     * horizontally-posed state. The initial direction is always right.
     */
    this.snakeDirection_ = 'r';
  }

  /**
   * Generate a number of new fruits at a random locations.