require 'sdl' SDL.init( SDL::INIT_VIDEO ) screen = SDL::setVideoMode(640,480,16,SDL::SWSURFACE) image = SDL::Surface.loadBMP("icon.bmp") image.setColorKey( SDL::SRCCOLORKEY || SDL::RLEACCEL ,0) $image = image.displayFormat class Sprite def initialize @x=rand(640) @y=rand(480) @dx=rand(11)-5 @dy=rand(11)-5 end def move @x += @dx if @x >= 640 then @dx *= -1 @x = 639 end if @x < 0 then @dx *= -1 @x = 0 end @y += @dy if @y >= 480 then @dy *= -1 @y = 479 end @y += @dy if @y < 0 then @dy *= -1 @y = 0 end end def draw(screen) SDL.blitSurface($image,0,0,32,32,screen,@x,@y) end end sprites = [] for i in 1..5 sprites << Sprite.new end class MovableSp def initialize() @ud=@lr=0; end def move() @ud=@lr=0; @lr=-1 if SDL::Key.press?(SDL::Key::H) or SDL::Key.press?(SDL::Key::LEFT) @lr=1 if SDL::Key.press?(SDL::Key::L) or SDL::Key.press?(SDL::Key::RIGHT) @ud=1 if SDL::Key.press?(SDL::Key::J) or SDL::Key.press?(SDL::Key::DOWN) @ud=-1 if SDL::Key.press?(SDL::Key::K) or SDL::Key.press?(SDL::Key::UP) end def draw(screen) SDL.blitSurface($image,0,0,32,32,screen,300+@lr*50,200+@ud*50) end end sprites << MovableSp.new event=SDL::Event.new while true if event.poll != 0 then if event.type==SDL::Event::QUIT then break end if event.type==SDL::Event::KEYDOWN then break if event.keySym==SDL::Key::ESCAPE end end screen.fillRect(0,0,640,480,0) SDL::Key.scan sprites.each {|i| i.move i.draw(screen) } screen.updateRect(0,0,0,0) end