hello.rb

require "jrubyfx"

# taken from https://github.com/jruby/jrubyfx/blob/master/samples/javafx/hello_devoxx.rb

class Hello < JRubyFX::Application

  def start(stage)
    with(stage, title: "Hello JRuby", x: 105, y: 140) do
      stage.layout_scene(500, 250, :black)  do
        hbox(padding: insets(60)) do
          text('JRuby', font: font('sanserif', 80)) do
            fill linear_gradient(0,0,0,1, true, :no_cycle, [stop(0, :pale_green), stop(1, :sea_green)])
          end
          text('FX', font: font('sanserif', 80)) do
            fill linear_gradient(0,0,0,1, true, :no_cycle, [stop(0, :cyan), stop(1, :dodger_blue)])
            set_effect(drop_shadow(color: :dodger_blue, radius: 25,spread: 0.25))
          end
        end
      end
      show
    end
  end
end
Hello.launch