generate reviews images using rmagick

gistfile1.txt

require 'rmagick'

module ImageGenerator
  class KununuRatingImage
    include Magick
    include CorporatePages::ReviewsHelper

    IMAGES_PATH      = "#{Rails.root}/public/assets/companies/img/kununu_ratings"
    BACKGROUND_COLOR = '#189898'
    FONT             = 'Helvetica'
    FONT_SIZE        = 34
    FONT_COLOUR      = '#ffffff'

    attr_reader :rating

    def initialize(rating)
      @rating = rating
    end

    def generate
      draw_kununu_rating_avg
      draw_kununu_stars
      generate_image
    end

  private

    def canvas
      @canvas ||= Image.new(128,128) { self.background_color = BACKGROUND_COLOR }
    end

    def draw_kununu_rating_avg
      rating_text = Draw.new

      canvas.annotate(rating_text, 0, 0, 30, 60, rating.to_s) do
        rating_text.pointsize   = FONT_SIZE
        rating_text.font        = FONT
        rating_text.fill        = FONT_COLOUR
        rating_text.font_weight = Magick::BoldWeight
      end
    end

    def draw_kununu_stars
      star_0     = ImageList.new("#{IMAGES_PATH}/stars/white_empty.png").resize_to_fit!(14,14)
      star_50    = ImageList.new("#{IMAGES_PATH}/stars/white_half.png").resize_to_fit!(14,14)
      star_100   = ImageList.new("#{IMAGES_PATH}/stars/white_full.png").resize_to_fit!(14,14)

      left_margin = 24
      star_size   = 16

      5.times do |i|
        star_image_porcentage = kununu_rounded_rating(rating.to_f, i + 1)
        canvas.composite!(eval("star_#{star_image_porcentage}"), WestGravity, left_margin + (star_size * i), 20, OverCompositeOp)
      end
    end

    def generate_image
      canvas.write "#{IMAGES_PATH}/kununu_review_#{rating}.png"
    end
  end
end

module ImageGenerator
  class KununuRatingImagesGenerator
    RATINGS_ARRAY = (1.0...5.0).step(0.01).map { |i| sprintf("%.2f", i) }

    def self.run
      RATINGS_ARRAY.each do |rating|
        KununuRatingImage.new(rating).generate
      end
    end
  end
end