Class: SpriteMap::ImageMap

Inherits:
ActiveRecord::Base
  • Object
show all
Defined in:
app/models/sprite_map/image_map.rb

Class Method Summary collapse

Instance Method Summary collapse

Class Method Details

.find_or_create_by_image_map(image_map) ⇒ Object 



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# File 'app/models/sprite_map/image_map.rb', line 11

def self.find_or_create_by_image_map(image_map)
  fingerprint = Digest::MD5.hexdigest(image_map.keys.sort.join('-'))

  if (sprite_map = ImageMap.find_by(fingerprint: fingerprint))
    sprite_map.touch
    sprite_map
  else
    total_width = 0
    total_height = 0

    images = {}

    positions = image_map.inject({}) do |memo, (identifier, path)|
      image_file = Magick::Image.read(path)[0]

      image_width = image_file.columns
      image_height = image_file.rows

      memo[identifier] = {
          x: total_width,
          y: 0,
          width: image_width,
          height: image_height
      }

      images[identifier] = {
          path: path,
          file: image_file
      }

      total_width += image_width
      total_height = [total_height, image_height].max
      memo
    end

    create_sprite_image(
        fingerprint: fingerprint,
        positions: positions,
        images: images,
        width: total_width,
        height: total_height
    )
  end
end

Instance Method Details

#url ⇒ Object 



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# File 'app/models/sprite_map/image_map.rb', line 56

def url
  image.url(:original)
end