File: alphadraw.rb

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libsdl-ruby 1.1.0-1
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require 'sdl'

SDL.init( SDL::INIT_VIDEO )
screen = SDL::setVideoMode(640,480,16,SDL::SWSURFACE)
SDL::WM::setCaption $0, $0

Red=screen.format.mapRGB(255,0,0)
screen.drawAAFilledCircle(320,240,220,[140,180,0])
screen.drawAALineAlpha(20,20,300,200,Red,rand(64)+128)
screen.drawAACircleAlpha(100,100,50,[87,87,87],rand(64)+128)
screen.drawFilledCircleAlpha(300,170,50,[87,80,0],rand(64)+128)
screen.drawEllipseAlpha(320,240,100,200,[200,255,0],rand(64)+128)

screen.flip

while true
  while event = SDL::Event2.poll
    case event
    when SDL::Event2::KeyDown, SDL::Event2::Quit
      exit
    end
  end

  sleep 0.2
end