Module: RubySprites::Packer::VerticalSmart

Defined in:
lib/lash-sprites/packer/vertical_smart.rb

Class Method Summary collapse

Class Method Details

.pack(images, options = {}) ⇒ Object 



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# File 'lib/lash-sprites/packer/vertical_smart.rb', line 8

def self.pack(images, options = {})
  width = 0
  height = 0
  
  images.sort! do |a, b|
    if a.width == b.width
      b.height <=> a.height
    else
      b.width <=> a.width
    end
  end

  blocks = []

  images.each do |img|
    next unless img.exists?
    smallest = nil
    exact = nil
    blocks.each do |block|
      next unless block.fits?(img)
      
      exact = block if (img.width == block.width || img.height == block.height) && (exact.nil? || block.area < exact.area)
      smallest = block if smallest.nil? || block.area < smallest.area
      
      break if smallest.area == img.area
    end

    if smallest
      if exact
        blocks.concat(split_block(blocks.delete(exact),img))
      else
        blocks.concat(split_block(blocks.delete(smallest),img))
      end
    else
      if width == 0 && height == 0
        b = Block.new(0, 0, img.width, img.height)
        width = img.width
        height = img.height
      else
        b = Block.new(0, height, width, img.height)
        height += img.height
      end
      blocks.concat(split_block(b,img))
    end
  end

  return {:width => width, :height => height}
end

.split_block(block, img) ⇒ Object 



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# File 'lib/lash-sprites/packer/vertical_smart.rb', line 57

def self.split_block(block, img)
  blocks = []
  img.x = block.x
  img.y = block.y
  if (block.width - img.width) * img.height > (block.height - img.height) * img.width
    blocks.push Block.new(block.x + img.width, block.y, block.width - img.width, block.height) if block.width != img.width
    blocks.push Block.new(block.x, block.y + img.height, img.width, block.height - img.height) if block.height != img.height
  else
    blocks.push Block.new(block.x + img.width, block.y, block.width - img.width, img.height) if block.width != img.width
    blocks.push Block.new(block.x, block.y + img.height, block.width, block.height - img.height) if block.height != img.height
  end
  return blocks
end