SPLT Gif Maker

gif.rb

=begin
objective::
Take two similar images, overlay them and show the difference between them.

example output: https://github.com/cameronbarker/cameronbarker.github.io/blob/master/prototype/splt/img/art-project.gif

requirements::
ruby 2.1.1
image size 616x616

running::
splt = SpltGif.new
crop
cropped_paths = splt.crop("foreground.jpg")
combine cropped images with background image
combined_paths = splt.combine(cropped_paths, "background.jpg")
animate the images
animated_gif = splt.animate(combined_paths)
=end



require 'open-uri'
require 'RMagick'

class SpltGif
  def crop(img)
    size = [1, 77, 154, 231, 308, 385, 462, 539, 616]
    paths = Array.new
    # get name
    parsed_imgage_name = URI.parse(img).path[1..-5]

    size.each do |s|
      image = Magick::ImageList.new
      urlimage = open(img)
      image = image.from_blob(urlimage.read)
      # crop image
         image = image.crop(Magick::NorthEastGravity, s, 616, true)
         # create name
         image_name = parsed_imgage_name + "-" + s.to_s + ".jpg"
         # temp save it
         image.write(image_name)
         # push name to array for return
         paths << image_name
         # debug
         puts image_name
    end
    return paths
  end

  def combine(cropped_paths, background_img)
    paths = Array.new
    cropped_paths.each do |p|
      #create combined
      image = Magick::ImageList.new(p)

      #init background
      background = Magick::ImageList.new
      #pull background
      urlimage = open(background_img)
      #create background
      background = background.from_blob(urlimage.read)

      #set gravity
      background.gravity = Magick::EastGravity
      #combine photos
      combined = background.composite_layers(image, Magick::OverCompositeOp)

      combined.format = "JPG"

      updated_name = p[0..-5] + ".jpg"

      combined.write(updated_name)

      paths << updated_name

      puts updated_name
    end
    return paths
  end

  def animate(paths)
    animation = Magick::ImageList.new()

    #update the array order
    updated_array = [paths[4], paths[5], paths[6], paths[7], paths[8], paths[7], paths[6], paths[5], paths[4], paths[3], paths[2], paths[1], paths[0], paths[1], paths[2], paths[3]]
    # loop through image paths to add to list
    updated_array.each do |i|
      animation.read i
      puts i
    end
    # animation delay 1 second == 20
    animation.delay = 20

    final_name = paths.first[0..-8] + "-GIF.gif"

    animation.format = "GIF"

    animation.write(final_name)

  end
end