hello_world.rb

require 'ray'

# Prerequisites:
# brew install glew libsndfile

# Tutorial:
# http://mon-ouie.github.io/projects/ray.html

quit_game = Proc.new do
    # This method doesn't exist yet. It is defined inside Ray, but since the
    # quit_game Proc doesn't run until Ray is setup, it doesn't matter!
    exit!
end

game = Ray.game('Hello') do

    # We have to make this into a block because it must be run
    # every time the scene changes
    register() do

       on(:quit, &quit_game)
       on(:key_press, key(:q), &quit_game)

    end

    scene(:hello) do
        @text = text("Hello, world!", {:size => 50, :at => [50, 50]})

        @obj = Ray::Polygon.rectangle([0, 0, 100, 100], Ray::Color.blue())
        @obj.pos = [100, 350]

        on(:mouse_motion) do |pos|
            @obj.pos = pos
        end

        render() do |win|
            win.draw(@text)
            win.draw(@obj)
        end
    end

    scenes.push(:hello)

end