From: "Konrad Słabig" <slabix@...>
Date: 2009-02-18T02:46:16+09:00
Subject: Ruby/Sdl, beginner problem, making sprites...

Hi. I'm beginner in programming, and also in ruby.

I have installed Ruby/Sdl
(http://www.kmc.gr.jp/~ohai/rubysdl_ref_2.en.html#label-126) and I have
a problem.

I tried to make a screen and surface, and it didn't worked. I'm looking
for answer for Two days, so now I'm asking here...

My code:

#--------------
#--------------
#--------------
require 'sdl'
class Sprite
  attr_accessor :x
  attr_accessor :y
  attr_accessor :alpha
  attr_accessor :image
  def initialize(path,x=0,y=0,alpha=256)
    # Jeden X odpowiada 1/640 szerokosci ekranu, jakikolwiek szeroki by
nie był.
    @x = ($screen.w/640)*x
    # Jeden Y odpowiada 1/480 szerokosci ekranu, jakikolwiek wysoki by
nie był.
    @y = ($screen.h/480)*y
    @alpha = alpha

    @image = SDL::Surface.load_bmp(path.to_s)
    @image.set_alpha(SDL::SRCALPHA,@alpha)
    @image.set_color_key( SDL::SRCCOLORKEY ,0)
    @image = @image.display_format
    $sprites << self

    update
  end

  def update
    $screen.put(@image,@x,@y)
  end

end


SDL.init( SDL::INIT_VIDEO )
$screen = SDL::Screen.open(640,480,16,SDL::SWSURFACE)
$sprites = []

$char = Sprite.new("tilek.bmp",320,240)

loop do
  while event = SDL::Event.poll
    case event
    when SDL::Event::Quit
      exit
    when SDL::Event::KeyDown
      $char.x += 32
      $char.y += 2
    end
  end
  background_color =  $screen.format.map_rgb(0,0,0)
  $screen.fillRect(0,0,640,480,background_color)
  for sprite in $sprites
    sprite.update
  end
  # inny update, do obslugi 2-warstwowych ramów (???) czy czegoś takiego
  $screen.flip
  # update całego okna
  $screen.update_rect(0,0,$screen.w,$screen.h)
end

# EnD...........
# --------------
# --------------

Ok... When I'm looking at the samples in Ruby/Sdl files,  there are
modules and everything that looks very very similar to that what I did
above. But Mine is not working ^^".

Can anyone help?
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