require 'sdl'

SDL.init( SDL::INIT_VIDEO )

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

image = SDL::Surface.loadBMP("icon.bmp")
image.setColorKey( SDL::SRCCOLORKEY ,0)
image = image.displayFormat

event=SDL::Event.new

i=0
scale=1.0;
dscale=0.1;
loop do
  if  event.poll != 0 then
    if event.type==SDL::Event::QUIT then
      break
    end
    if event.type==SDL::Event::KEYDOWN then
      exit
    end
  end
  screen.fillRect(0,0,640,480,0)
  
  i+=1;
  scale+=dscale;
  dscale = -dscale if scale>4.0 or scale < 0.2
  SDL.rotateScaledBlit(image,screen,320,200,i,scale)
  
  screen.flip
end