Class: AvatarGenerator::Generator

Inherits:
Object
  • Object
show all
Defined in:
lib/avatar_generator/generator.rb

Constant Summary collapse

GRID_SIZE = 
5

Instance Method Summary collapse

Constructor Details

#initialize(identifier, size: nil, background: nil) ⇒ Generator

Returns a new instance of Generator.

Raises:

  • (ArgumentError) 


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# File 'lib/avatar_generator/generator.rb', line 6

def initialize(identifier, size: nil, background: nil)
  @identifier = identifier
  @image_size = size || AvatarGenerator.configuration.size
  @background = background || AvatarGenerator.configuration.background

  raise ArgumentError, "image size must be at least 5" if @image_size < 5
end

Instance Method Details

#call ⇒ Object 



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# File 'lib/avatar_generator/generator.rb', line 14

def call
  bytes = Digest::MD5.digest(@identifier).bytes

  color =
    bytes.first(3)

  grid =
    bytes
    .each_slice(3)
    .select { |row| row.length == 3 }
    .map { |row| mirror_row(row) }
    .flatten
    .each_with_index
    .select { |code, _| code.even? }

  pixel_map =
    grid.map do |_, index|
      cell =
        @image_size / GRID_SIZE

      x =
        (index % GRID_SIZE) * cell

      y =
        (index / GRID_SIZE) * cell

      [
        [x, y],
        [x + cell - 1, y + cell - 1]
      ]
    end

  Image.new(
    color: color,
    image_size: @image_size,
    pixel_map: pixel_map,
    background: @background
  )
end