Module: Compass::SassExtensions::Sprites::LayoutMethods

Included in:
SpriteMap
Defined in:
lib/compass/sass_extensions/sprites/layout_methods.rb

Constant Summary collapse

HORIZONTAL = 
'horizontal'
DIAGONAL = 
'diagonal'
SMART = 
'smart'
VERTICAL = 
'vertical'

Instance Method Summary collapse

Instance Method Details

#calculate_diagonal_dimensions ⇒ Object 



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# File 'lib/compass/sass_extensions/sprites/layout_methods.rb', line 101

def calculate_diagonal_dimensions
  @width = @images.inject(0) {|sum, img| sum + img.width}
  @height = @images.inject(0) {|sum, img| sum + img.height}
end

#calculate_diagonal_positions ⇒ Object 



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# File 'lib/compass/sass_extensions/sprites/layout_methods.rb', line 106

def calculate_diagonal_positions
  previous = nil
  @images.each_with_index do |image, index|
    if previous.nil?
      previous = image
      image.top = @height - image.height
      image.left = 0
      next
    end
    image.top = previous.top - image.height
    image.left = previous.left + previous.width
    previous = image
  end
end

#calculate_horizontal_positions ⇒ Object 



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# File 'lib/compass/sass_extensions/sprites/layout_methods.rb', line 121

def calculate_horizontal_positions
  @images.each_with_index do |image, index|
    image.top = image.position.unit_str == '%' ? (@height - image.height) * (image.position.value / 100.0) : image.position.value
    next if index == 0
    last_image = @images[index-1]
    image.left = last_image.left + last_image.width + [image.spacing, last_image.spacing].max
  end
end

#calculate_repeat_extra_width! ⇒ Object 



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# File 'lib/compass/sass_extensions/sprites/layout_methods.rb', line 77

def calculate_repeat_extra_width!
  require 'rational' #for ruby 1.8.7
  m = @images.inject(1) {|m,img| img.repeat_x? ? m.lcm(img.width) : m}
  remainder = @width % m
  @width += (m - remainder) unless remainder.zero?
end

#calculate_smart_positions ⇒ Object 



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# File 'lib/compass/sass_extensions/sprites/layout_methods.rb', line 84

def calculate_smart_positions
  fitter = ::Compass::SassExtensions::Sprites::RowFitter.new(@images)
  current_y = 0
  fitter.fit!.each do |row|
    current_x = 0
    row.images.each_with_index do |image, index|
      image.left = current_x
      image.top = current_y
      current_x += image.width
    end
    current_y += row.height
  end
  @width = fitter.width
  @height = fitter.height
end

#calulate_vertical_postions ⇒ Object 



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# File 'lib/compass/sass_extensions/sprites/layout_methods.rb', line 130

def calulate_vertical_postions
  @images.each_with_index do |image, index|
    image.left = (image.position.unit_str == "%" ? (@width - image.width) * (image.position.value / 100.0) : image.position.value).to_i
    next if index == 0
    last_image = @images[index-1]
    image.top = last_image.top + last_image.height + [image.spacing,  last_image.spacing].max
  end
end

#compute_image_positions! ⇒ Object

Calculates the overal image dimensions collects image sizes and input parameters for each sprite



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# File 'lib/compass/sass_extensions/sprites/layout_methods.rb', line 32

def compute_image_positions!
  case layout
  when SMART
    calculate_smart_positions
  when DIAGONAL
    calculate_diagonal_dimensions
    calculate_diagonal_positions
  when HORIZONTAL
    @height = height_for_horizontal_layout
    calculate_horizontal_positions
    @width = width_for_horizontal_layout
  else
    @images.sort! do |a,b| 
      if (b.size <=> a.size) === 0
        a.name <=> b.name
      else
        b.size <=> a.size
      end
    end

    @width = width_for_vertical_layout
    calulate_vertical_postions
    @height = height_for_vertical_layout
    if @images.any?(&:repeat_x?)
      calculate_repeat_extra_width!
      tile_images_that_repeat
     end
  end
end

#diagonal? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/compass/sass_extensions/sprites/layout_methods.rb', line 18

def diagonal?
  layout == DIAGONAL
end

#height_for_horizontal_layout ⇒ Object 



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# File 'lib/compass/sass_extensions/sprites/layout_methods.rb', line 144

def height_for_horizontal_layout
  @height = @images.map {|image| image.height + image.offset}.max
end

#height_for_vertical_layout ⇒ Object 



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# File 'lib/compass/sass_extensions/sprites/layout_methods.rb', line 139

def height_for_vertical_layout
  last = @images.last
  last.top + last.height
end

#horizontal? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/compass/sass_extensions/sprites/layout_methods.rb', line 14

def horizontal?
  layout == HORIZONTAL
end

#layout ⇒ Object 



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# File 'lib/compass/sass_extensions/sprites/layout_methods.rb', line 26

def layout
  @layout ||= @kwargs.get_var('layout').value
end

#smart? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/compass/sass_extensions/sprites/layout_methods.rb', line 10

def smart?
  layout == SMART
end

#tile_images_that_repeat ⇒ Object 



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# File 'lib/compass/sass_extensions/sprites/layout_methods.rb', line 62

def tile_images_that_repeat
  @images.map {|img| img if img.repeat_x?}.compact.each do |image|
    x = image.left - (image.left / image.width).ceil * image.width
      while x < @width do
        begin
          img = image.dup
          img.top = image.top
          img.left = x.to_i
          @images << img
          x += image.width 
        end
      end
    end
end

#vertical? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/compass/sass_extensions/sprites/layout_methods.rb', line 22

def vertical?
  layout == VERTICAL
end

#width_for_horizontal_layout ⇒ Object 



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# File 'lib/compass/sass_extensions/sprites/layout_methods.rb', line 148

def width_for_horizontal_layout
  @images.inject(0) { |sum, image| sum += (image.width + image.spacing) }
end

#width_for_vertical_layout ⇒ Object 



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# File 'lib/compass/sass_extensions/sprites/layout_methods.rb', line 152

def width_for_vertical_layout
  @images.map { |image| image.width + image.offset }.max
end