akamai_sprite_generator

generate_sprit.rb

module KMM
  class SpriteGenerator
    attr_accessor :files
    attr_accessor :gridsize
    attr_accessor :coords
    def initialize(path = ".")
      @files = Dir["./*.jpg"]
      @files.sort!
      @gridsize = Math.sqrt(files.length).ceil.to_i
      @coords = get_geometry(files.first)
      
    end
    def get_geometry(file)
    			`identify -format "%g" #{file}`.strip
    end
    def generate_sprite
      `montage #{@files.join(" ")} -tile #{@gridsize}x#{@gridsize} -geometry #{@coords} sprite.png`
    end
    def output
      puts "WEBVTT"
      puts ""
      generate_sprite
      
      tsize = get_thumb_size(files.first)
      
      
      files.each_with_index do | f, idx |
          time_matches = f.scan(/_([0-9]+)h\.([0-9]+)m\.([0-9]+)s\.jpg/)
          hours = time_matches.first[0]
          minutes = time_matches.first[1]
          seconds = time_matches.first[2]
          
          
          # next one
          if idx+1 > files.length-1
            next
          end
          time_matches = files[idx+1].scan(/_([0-9]+)h\.([0-9]+)m\.([0-9]+)s\.jpg/)
          nhours = time_matches.first[0]
          nminutes = time_matches.first[1]
          nseconds = time_matches.first[2]

          xywh = get_grid_coordinates(idx+1,@gridsize,tsize[:w],tsize[:h])
          
          puts "#{hours}:#{minutes}:#{seconds}.000 --> #{nhours}:#{nminutes}:#{nseconds}.000 "
          puts "sprite.png#xywh=#{xywh}"
          puts ""
          
          
      end
      
      
    end
    def get_thumb_size(f)
      i = `identify -format "%g" #{f}`.strip
      w,h = i.split("+").first.split("x")
      return {
        w: w.to_i,
        h: h.to_i
      }
    end
    def get_grid_coordinates(image_index,gridsize,w,h)
			    y = (image_index - 1)/gridsize
			    x = (image_index -1) - (y * gridsize)
			    imgx = x * w
			    imgy =y * h
				"#{imgx},#{imgy},#{w},#{h}"	
		end
  end
end

a = KMM::SpriteGenerator.new(".")
a.output