Class: Meatloaf::Sprite

Inherits:
Object
  • Object
show all
Defined in:
lib/meatloaf.rb

Instance Method Summary collapse

Constructor Details

#initialize(group, css_name) ⇒ Sprite

Returns a new instance of Sprite.



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# File 'lib/meatloaf.rb', line 26

def initialize(group, css_name)
  @group = group
  @css_name = css_name
  @ingredients = {}
  @height = 0
end

Instance Method Details

#add_image(image_css_url) ⇒ Object

Add an image to this sprite. Returns CSS for ‘background: ’



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# File 'lib/meatloaf.rb', line 34

def add_image(image_css_url)
  return get_css_for(@ingredients[image_css_url]) if @ingredients[image_css_url]

  # For now, just place the image at the bottom of the sprite. 
  # TODO: improve positioning algorithm
  ingredient = Ingredient.new(image_css_url, 0, @height)
  @height += ingredient.height
  @ingredients[image_css_url] = ingredient
  get_css_for(ingredient)
end

#finalize! ⇒ Object 



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# File 'lib/meatloaf.rb', line 45

def finalize!
  # Create ImageMagick command.
  final_image_path = "#{Rails.root}/app/assets/images/#{filename}"
  input_files_string = @ingredients.values.collect{ |ing| "'#{ing.image_path}'" }.join(' ')
  command = "convert #{input_files_string} -append '#{final_image_path}'"
  `#{command}`
end