Initials avatar - create an image with letters for using as the user avatar.

initials_avatar.rb

require "mini_magick"

# require "initials_avatar"
# InitialsAvatar.new(initials: "PC").avatar_path
class InitialsAvatar
  BACKGROUND_COLORS = [
    "#C53030", "#9C4221", "#975A16", "#2F855A", "#2C7A7B", "#2B6CB0", "#434190", "#553C9A", "#97266D"
  ]

  def initialize(initials:)
    @initials = initials
    @background_color = BACKGROUND_COLORS.sample

    create
  end

  def avatar_path
    image.path
  end

  private

  def image
    @image ||= Tempfile.new(%W[mini_magick_ .png])
  end

  def create
    MiniMagick::Tool::Convert.new do | new_image |
      new_image.background "#{@background_color}"
      new_image.pointsize '90'
      new_image.font font
      new_image.fill "#FFFFFF"
      new_image.size '180x180'
      new_image.gravity 'center'
      new_image << "label:#{@initials}"

      new_image << "png:#{image.path}"
    end
  end

  def font
    if `identify -list font | grep Helvetica`.empty?
      "DejaVu-Sans"
    else
      "Helvetica"
    end
  end
end

mac os:
brew install imagemagick