Class: Sprite::ImageCombiner

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

Instance Method Summary collapse

Constructor Details

#initialize(image_config) ⇒ ImageCombiner

Returns a new instance of ImageCombiner.



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# File 'lib/sprite/image_combiner.rb', line 3

def initialize(image_config)
  # avoid loading rmagick till the last possible moment
  require 'rmagick'
  @image_config = image_config
end

Instance Method Details

#composite_images(dest_image, src_image, x, y) ⇒ Object 



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# File 'lib/sprite/image_combiner.rb', line 9

def composite_images(dest_image, src_image, x, y)
  width = [src_image.columns + x, dest_image.columns].max
  height = [src_image.rows + y, dest_image.rows].max
  image = Magick::Image.new(width, height)
  if @image_config.background_color
    image.opacity = 0
  else
    image.opacity = Magick::MaxRGB
  end

  image.composite!(dest_image, 0, 0, Magick::OverCompositeOp)
  image.composite!(src_image, x, y, Magick::OverCompositeOp)
  image
end

#image_properties(image) ⇒ Object

Image Utility Methods



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# File 'lib/sprite/image_combiner.rb', line 26

def image_properties(image)
  {:name => File.basename(image.filename).split('.')[0], :width => image.columns, :height => image.rows}
end