test.rb

require 'tempfile'

module Colbert
  extend self

  def generate_image file_path, text
    on_notice = text.map(&:upcase)

    text_width=350*1
    text_height=50*1

    input_coords = %W[
    0,0
    #{text_width},0
    #{text_width},#{text_height}
    0,#{text_height}
    ]

    dest_coords = [
      "212,1 522,37 520,82 213,53",
      "213,65 520,95 520,139 214,116",
      "215,134 519,157 518,198 215,181",
      "215,198 519,214 518,256 215,245",
      "215,262 517,272 517,316 215,309",
      "221,326 523,329 522,372 221,374",
      "214,391 516,388 516,431 215,438",
      "215,455 515,447 514,487 214,501",
      "213,520 516,505 515,551 213,566",
      "220,585 520,561 521,602 220,630"
    ].map do |s|
      s.split(' ')
    end

    command = %W[convert colbert.jpg -virtual-pixel transparent]

    dest_coords.each_with_index do |dest, i|
      text = on_notice[i]
      pairs = input_coords.zip(dest)
      command << "("
      command.concat %W[-background transparent -fill white -font OpenSans-CondBold.ttf -strokewidth 2 -stroke black -size 350x50 -gravity center]
      command << "label:#{text}"
      command.concat %W[+distort Perspective #{pairs.flatten.join(' ')}]
      command << ')'
    end


    command.concat %W[-layers merge]
    command << file_path

    p command
    system *command
  end
end

on_notice = [
  'Distractions',
  'You Know Who You Are',
  'The Weather Channel',
  'Black Hole at Center of Galaxy',
  'Fantasies of Jane Fonda',
  'Grizzly Bears',
  'Candy Apples',
  'Mike Huckabee',
  'Pant Cuffs',
  'OK GO'
]

Colbert.generate_image('output.png', on_notice)