Image manipulation in shoes

fotoyop_chunky.rb

Shoes.setup do
   gem "chunky_png"
end

require "chunky_png"

Shoes.app(:title => "Fotoyop", :width => 800, :height => 600, :resize => true) do
	stack do 
		title("fotoyop")
		button("cargar imagen") do
			@imagen = ask_open_file
			image(@imagen)
		end
		button("cargar sello") do
			@sello = ask_open_file
			image(@sello)
		end
		button("sellar") do
			avatar = ChunkyPNG::Image.from_file(@imagen)
			badge  = ChunkyPNG::Image.from_file(@sello)
			avatar.compose!(badge, 10, 10)
			avatar.save("composited.png") # Force the fast saving routine.
			image("composited.png")
		end
		button("rotar") do
			image = ChunkyPNG::Image.from_file(@imagen)
			image[0, 0] = ChunkyPNG::Color.rgba(255, 0,0, 128)
			new_image = image.flip_horizontally.rotate_right
			new_image.save("rotada.png")
			image("rotada.png")
		end
	end
end