image_blur_3.rb

image_blur3.rb

class Image
  def initialize(two_dimensional_array, marker = 1)
    @data = two_dimensional_array
    @marker = marker
  end
  attr_reader :data, :marker

  def output_image
    data.each { |row| puts row.join }
  end

  def blur(distance)
    coordinates_to_blur = []
    coordinates_to_start_blurring_out_from do |row_index_to_blur_out_from, column_index_to_blur_out_from|
      # puts "#{row_index_to_blur_out_from},#{column_index_to_blur_out_from}"
      coordinates_that_could_be_blurred_based_on(
        row_index: row_index_to_blur_out_from, column_index: column_index_to_blur_out_from, distance: distance
      ) do |row_index, column_index|
        coordinates_to_blur << [row_index, column_index] if coordinates_are_in_the_image?(row_index: row_index, column_index: column_index)
      end
    end
    coordinates_to_blur.each do |row_index, column_index|
      data[row_index][column_index] = 1
    end
  end

  private

  def coordinates_to_start_blurring_out_from
    data.each_with_index do |row, row_index|
      row.each_with_index do |cell, column_index|
        yield(row_index, column_index) if cell == marker
      end
    end
  end

  def coordinates_that_could_be_blurred_based_on(row_index:, column_index:, distance:)
    (-1 * distance..distance).each do |delta_row_index|
      (-1 * distance..distance).each do |delta_column_index|
        next if delta_row_index.abs + delta_column_index.abs > distance
        yield(row_index + delta_row_index, column_index + delta_column_index)
      end
    end
  end

  def coordinates_are_in_the_image?(row_index:, column_index:)
    return false if row_index < 0
    return false if column_index < 0
    return false if data[row_index].nil?
    return false if data[row_index][column_index].nil?
    return true
  end
end

image = Image.new([
  [1,0,0,0,0,0,0,0,1],
  [0,0,0,0,0,0,0,0,0],
  [0,0,0,0,0,0,0,0,0],
  [0,0,0,0,0,0,0,0,0],
  [0,0,0,0,1,0,0,0,0],
  [0,0,0,0,0,0,0,0,0],
  [0,0,0,0,0,0,0,0,0],
  [0,0,0,0,0,0,0,0,0],
  [1,0,0,0,0,0,0,0,1]
])

image.blur(3)
image.output_image